CN104363382B

CN104363382B - A kind of method and apparatus utilizing visible light signal transmission/obtaining information

Info

Publication number: CN104363382B
Application number: CN201410168806.1A
Authority: CN
Inventors: 郭成; 胡洪
Original assignee: BEIJING G-WEARABLES INFORMATION SCIENCE & TECHNOLOGY Co Ltd
Current assignee: BEIJING G-WEARABLES INFORMATION SCIENCE & TECHNOLOGY Co Ltd
Priority date: 2014-04-24
Filing date: 2014-04-24
Publication date: 2015-10-14
Anticipated expiration: 2034-04-24
Also published as: CN105187732A; CN105187732B; CN104363382A

Abstract

The invention discloses a kind of utilization and transmit/the method and apparatus of obtaining information from the visible light signal of light source.Described method comprises: based on information waiting for transmission, modulate two or more drive singal of described light source, to obtain two or more modulated drive signal for driving described light source to launch the visible light signal of two or more wavelength, the level of described modulated drive signal changes between high level and low level with different frequencies and/or different phase places and/or different amplitudes; And based on two or more modulated drive signal described, launch the visible light signal of two or more wavelength, to transmit described information, the level of described visible light signal changes between high level and low level with different frequencies and/or different phase places and/or different amplitudes, and described information corresponds to the pattern of the color fringe shown from the image that described visible light signal obtains.

Description

A kind of method and apparatus utilizing visible light signal transmission/obtaining information

Technical field

The present invention relates to visible light communication field, particularly relate to the method and apparatus utilizing visible light signal transmission/obtaining information.

Background technology

Visible light communication is the communication technology of the change transmission information utilizing visible ray (color, intensity or position).This communication technology for transmission information is the light signal based on high frequency flicker.Particularly, first information to be transmitted be encoded as digital signal; Then this digital signal is used to the drive current of modulated light source or the duration of driving voltage or frequency, makes light source high frequency flicker.This high frequency flicker signal can be detected by light-sensitive unit, such as, and imageing sensor, and revert to transmitted information.The major advantage of this transmission of visible light technology is highly confidential property, do not account for radio channel resource, cost is low and easily and LED integrated.

Wherein a kind of existing visible light communication technology is based on imageing sensor " Rolling shutter " mechanism.The different piece of imageing sensor exposes at different time, namely often goes or is often listed in different time exposure.Based on this feature, when taking the image of the fast-changing light source of brightness, the imageing sensor with Rolling shutter can obtain the image comprising bright fringe or dark fringe.By measuring width or the gray scale of striped, transmitted information can be recovered.

Such as, but the method has following defect: the local excessive exposure of imageing sensor may affect the width of striped, and, in overexposure region, striped may narrow or even disappear, and causes graphical analysis and decodes unsuccessfully; And different background illumination conditions can cause the uncertainty measuring width of fringe.

In addition, the light-sensitive unit used in this visible light communication must be specially designed, to detect visible ray, therefore, can only be applied to limited scene.And such as, although the retrievable mobile device of business (as smart mobile phone, panel computer, palmtop PC) has photosensitive part, imageing sensor, it is not suitable for this high frequency flicker signal.

Summary of the invention

In view of the above problems, propose the present invention, the invention provides and a kind ofly utilize visible light signal to transmit or from the technical scheme of visible light signal obtaining information, to overcome the above-mentioned defect of at least one.

According to a first aspect of the invention, provide the method for a kind of utilization from the visible light signal transmission information of two or more wavelength of light source, comprise: based on information waiting for transmission, modulate two or more drive singal of described light source, to obtain two or more modulated drive signal for driving described light source to launch the visible light signal of two or more wavelength, the level of described modulated drive signal changes between high level and low level with different frequencies and/or different phase places and/or different amplitudes; And based on two or more modulated drive signal described, launch the visible light signal of two or more wavelength, to transmit described information, the level of described visible light signal changes between high level and low level with different frequencies and/or different phase places and/or different amplitudes, and described information corresponds to the pattern of the color fringe shown from the image that described visible light signal obtains.

Alternatively, in above-mentioned according to an embodiment of the invention either method, based on information waiting for transmission, modulate two or more drive singal of described light source, comprise to obtain two or more modulated drive signal: based on information waiting for transmission, modulate two or more driving voltages or two or more drive currents of described light source, to obtain first group of modulation driving voltage or first group of modulation drive current.

Alternatively, in above-mentioned according to an embodiment of the invention either method, described first group of modulation drive current is greater than unmodulated drive current respectively, makes the luminous flux of the light source driven by described first group of modulation drive current equal the luminous flux of the light source driven by described unmodulated drive current.

Alternatively, in above-mentioned according to an embodiment of the invention either method, described method also comprises: based on second group of modulation drive current with high-frequency carrier signal, launch described visible light signal, described second group of modulation drive current is greater than unmodulated drive current, makes the light source that driven by described second group of modulation drive current comprising high level and the luminous flux in low level each cycle is constant.

Alternatively, in above-mentioned according to an embodiment of the invention either method, the information corresponding to the pattern of color fringe comprises data bit, and described data bit comprises corresponding to the number of described color fringe, color, brightness or the data that put in order.

Alternatively, in above-mentioned according to an embodiment of the invention either method, information corresponding to the pattern of color fringe also comprises one or more start bit and/or one or more error correction bit, described one or more start bit is for identifying the original position of one group of data bit, and described one or more error correction bit is for checking the mistake in described data bit.

Alternatively, in above-mentioned according to an embodiment of the invention either method, based on information waiting for transmission, modulate two or more drive singal of described light source, comprise to obtain two or more modulated drive signal: the frequency of modulation two or more drive singal described and/or phase place and/or amplitude, to obtain two or more modulated drive signal.

Alternatively, in above-mentioned according to an embodiment of the invention either method, the color fringe in described image obtains from the combination of the visible light signal of two or more wavelength.

According to a second aspect of the invention, provide the method for a kind of utilization from the visible light signal obtaining information of two or more wavelength of light source, comprise: the described visible light signal of two or more wavelength launched from light source obtains image, the level of described visible light signal changes between high level and low level with different frequencies and/or different phase places and/or different amplitudes; Measure the pattern from the color fringe the described image that described visible light signal obtains; And obtain the information of the pattern corresponding to described color fringe.

Alternatively, in above-mentioned according to an embodiment of the invention either method, acquisition image comprises: obtain described image by the image capturing device comprising imageing sensor, the exposure mode of described imageing sensor is rolling shutter mode, and the sample frequency of Rolling shutter is higher than the frame rate of described imageing sensor.

Alternatively, in above-mentioned according to an embodiment of the invention either method, obtain image and comprise: image described in the imageing sensor photographs with Rolling shutter, the different piece of wherein said imageing sensor exposes in different time points.

Alternatively, in above-mentioned according to an embodiment of the invention either method, described visible light signal is launched based on modulated drive signal by described light source, described modulated drive signal drives described light source to launch described visible light signal, and the level of described visible light signal changes between high level and low level with different frequencies and/or different phase places and/or different amplitudes.

Alternatively, in above-mentioned according to an embodiment of the invention either method, described light source is one or more groups light source, and: the described visible light signal acquisition image launched from light source comprises: the described visible light signal launched from one or more groups light source described obtains image, and the one or more exposure areas in wherein said image correspond to one or more groups light source described; Measure and comprise from the pattern of the color fringe the described image that described visible light signal obtains: the pattern measuring the color fringe of one or more exposure area described in described image; And the information obtaining the pattern corresponding to described color fringe comprises: the information obtaining the described color fringe pattern of one or more exposure area described corresponded in described image.

According to a third aspect of the invention we, provide a kind of for utilizing the light source of the visible light signal transmission information of two or more wavelength, comprise: modulator, for based on information waiting for transmission, modulate two or more drive singal of described light source, to obtain two or more modulated drive signal for driving described light source to launch the visible light signal of two or more wavelength, the level of described modulated drive signal changes between high level and low level with different frequencies and/or different phase places and/or different amplitudes; And reflector, for based on two or more modulated drive signal described, launch the visible light signal of two or more wavelength, to transmit described information, the level of described visible light signal changes between high level and low level with different frequencies and/or different phase places and/or different amplitudes, and described information corresponds to the pattern of the color fringe shown from the image that described visible light signal obtains.

Alternatively, in above-mentioned according to an embodiment of the invention arbitrary light source, described modulator is used for: based on information waiting for transmission, modulate two or more driving voltages or two or more drive currents of described light source, to obtain first group of modulation driving voltage or first group of modulation drive current.

Alternatively, in above-mentioned according to an embodiment of the invention arbitrary light source, described first group of modulation drive current is greater than unmodulated drive current respectively, makes the luminous flux of the light source driven by described first group of modulation drive current equal the luminous flux of the light source driven by described unmodulated drive current.

Alternatively, in above-mentioned according to an embodiment of the invention arbitrary light source, described reflector is used for: based on second group of modulation drive current with high-frequency carrier signal, launch described visible light signal, described second group of modulation drive current is greater than unmodulated drive current, makes the light source that driven by described second group of modulation drive current comprising high level and the luminous flux in low level each cycle is constant.

Alternatively, in above-mentioned according to an embodiment of the invention arbitrary light source, the information corresponding to the pattern of color fringe comprises data bit, and described data bit comprises corresponding to the number of described color fringe, color, brightness or the data that put in order.

Alternatively, in above-mentioned according to an embodiment of the invention arbitrary light source, information corresponding to the pattern of color fringe also comprises one or more start bit and/or one or more error correction bit, described one or more start bit is for identifying the original position of one group of data bit, and described one or more error correction bit is for checking the mistake in described data bit.

Alternatively, in above-mentioned according to an embodiment of the invention arbitrary light source, described modulator is used for: the frequency of modulation two or more drive singal described and/or phase place and/or amplitude, to obtain two or more modulated drive signal.

Alternatively, in above-mentioned according to an embodiment of the invention arbitrary light source, the color fringe in described image obtains from the combination of the visible light signal of two or more wavelength.

According to a forth aspect of the invention, provide a kind of device of the visible light signal obtaining information from two or more wavelength from light source, comprise: imageing sensor, described visible light signal for two or more wavelength of launching from light source obtains image, and the level of described visible light signal changes between high level and low level with different frequencies and/or different phase places and/or different amplitudes; Memory, for storing the image that described imageing sensor obtains; Processor, for measuring the pattern of the color fringe in storage described image in which memory, and obtains the information of the pattern corresponding to described color fringe.

Alternatively, in above-mentioned according to an embodiment of the invention arbitrary device, the exposure mode of described imageing sensor is rolling shutter mode, and the sample frequency of Rolling shutter is higher than the frame rate of described imageing sensor.

Alternatively, in above-mentioned according to an embodiment of the invention arbitrary device, described imageing sensor is imageing sensor with Rolling shutter and for obtaining image from visible light signal, the different piece of wherein said imageing sensor exposes in different time points.

Alternatively, in above-mentioned according to an embodiment of the invention arbitrary device, described visible light signal is launched based on modulated drive signal by described light source, described modulated drive signal drives described light source to launch described visible light signal, and the level of described visible light signal changes between high level and low level with different frequencies and/or different phase places and/or different amplitudes.

Alternatively, in above-mentioned according to an embodiment of the invention arbitrary device, described light source is one or more groups light source, and: the described visible light signal that described imageing sensor is used for launching from one or more groups light source described obtains image, and the one or more exposure areas in wherein said image correspond to one or more groups light source described; The image that described memory obtains for storing described imageing sensor; Described processor for measuring the pattern of the color fringe of one or more exposure area described in described image, and obtains the information of the described color fringe pattern of one or more exposure area described corresponded in described image.

Alternatively, in above-mentioned according to an embodiment of the invention arbitrary device, the color fringe in described image obtains from the combination of the visible light signal of two or more wavelength.

To sum up, exemplary embodiment of the present invention provide a kind of effectively and efficiently for transmitting/scheme of obtaining information, it is transmission/obtaining information more fast and more accurately, and the information transmitting/obtain can comprise more data position.White transition only has the transmission of representative " 1 " or " 0 " or does not transmit two kinds of selections, within the unit interval, only can transmit the data of 1 bit.Compared with white transition, according to exemplary embodiment of the present invention, within the unit interval, the visible light signal utilizing the light source of multiple color to launch two or more wavelength can transmit more data bit, and such as, three kinds of color RGB can transmit the data of 24 bits.Further, utilize the different frequency of visible light signal and/or out of phase and/or different amplitude, can in transmission per unit of time more data.

Above-mentioned explanation is only the general introduction of technical solution of the present invention, in order to technological means of the present invention can be better understood, and can be implemented according to the content of specification, and in order to above and other objects of the present invention, feature and advantage can be become apparent, following spy enumerates the specific embodiment of the present invention.

Accompanying drawing explanation

By reading hereafter detailed description of the preferred embodiment, various other advantage and benefit will become cheer and bright for those of ordinary skill in the art.Accompanying drawing only for illustrating the object of preferred implementation, and does not think limitation of the present invention.Parts in accompanying drawing are necessarily relative to each other not proportional.And in whole accompanying drawing, represent identical parts by identical reference symbol.In the accompanying drawings:

Fig. 1 is the flow chart utilizing the method 100 of visible light signal transmission information according to exemplary embodiment of the present invention;

Fig. 2 is the schematic diagram of the drive singal for driving light source with the modulation of OOK method according to exemplary embodiment of the present invention;

Fig. 3 A is the schematic diagram of the drive singal for driving light source with the modulation of OOK method according to another exemplary embodiment of the present invention;

Fig. 3 B is the schematic diagram of the image obtained from visible light signal according to exemplary embodiment of the present invention;

Fig. 4 is the schematic diagram of the modulated drive signal for driving light source obtained by the frequency of modulated drive signal according to another exemplary embodiment of the present invention;

Fig. 5 is the schematic diagram of the modulated drive signal for driving light source obtained by the amplitude of modulated drive signal according to exemplary embodiment of the present invention;

Fig. 6 is the schematic diagram of the modulated drive signal for driving light source obtained by the phase place of modulated drive signal according to exemplary embodiment of the present invention;

Fig. 7 is the schematic diagram of the modulated drive signal for driving light source obtained according to the amplitude of the drive singal by a modulation driving light source of exemplary embodiment of the present invention;

Fig. 8 is the schematic diagram of the image obtained from visible light signal according to exemplary embodiment of the present invention;

Fig. 9 is the schematic diagram of the modulated drive signal for driving light source obtained according to the phase place of drive singal by modulation driving light source and the amplitude of exemplary embodiment of the present invention;

Figure 10 is the schematic diagram of the modulated drive signal for driving light source obtained according to the frequency of drive singal by modulation driving light source and the amplitude of exemplary embodiment of the present invention;

Figure 11 is the schematic diagram of the modulated drive signal for driving light source obtained according to the frequency of drive singal by modulation driving light source and the phase place of exemplary embodiment of the present invention;

Figure 12 is the schematic diagram corresponding to the information of the pattern of color fringe comprising a start bit according to exemplary embodiment of the present invention;

Figure 13 is the schematic diagram corresponding to the information of the pattern of color fringe comprising a start bit and an error correction bit according to exemplary embodiment of the present invention;

Figure 14 A is the schematic diagram equaling the modulation drive current of the light source of unmodulated drive current according to an illustrative embodiment of the invention;

Figure 14 B is the schematic diagram being greater than the modulation drive current of unmodulated drive current according to an illustrative embodiment of the invention;

Figure 14 C is according to an exemplary embodiment of the present invention without the schematic diagram being greater than the modulation drive current of unmodulated drive current of high-frequency carrier signal;

Figure 14 D is according to an exemplary embodiment of the present invention with the schematic diagram being greater than the modulation drive current of unmodulated drive current of high-frequency carrier signal;

Figure 15 is according to the explanation of the exemplary embodiments of the present invention flow chart for the method for the visible light signal obtaining information of two or more wavelength from light source;

Figure 16 is the schematic diagram of the image from visible light signal according to exemplary embodiment of the present invention;

Figure 17 is the schematic diagram comprising the image of one or more exposure area corresponding to one or more groups light source according to exemplary embodiment of the present invention;

Figure 18 be according to exemplary embodiment of the present invention for by the light source 300 of visible light signal transmission information and the schematic diagram of device 400;

Figure 19 is the schematic diagram comprising the device of multiple imageing sensor according to exemplary embodiment of the present invention;

Figure 20 A is the schematic diagram with realtime graphic and the interface from its information obtained of the full screen display according to exemplary embodiment of the present invention;

Figure 20 B is the schematic diagram of the interface of the information obtained from image according to the display of exemplary embodiment of the present invention;

Figure 21 is the schematic diagram for the device from visible light signal obtaining information according to exemplary embodiment of the present invention, and this device comprises the imageing sensor that the activation signal that sent by reflector activates;

Figure 22 be according to exemplary embodiment of the present invention with the hardware based switch installed in reflector, activate the schematic diagram for the imageing sensor in the device from visible light signal obtaining information;

Figure 23 is the schematic diagram being integrated in the transducer among reflector according to exemplary embodiment of the present invention;

Figure 24 is the schematic diagram transmitting polytype information with reflector according to exemplary embodiment of the present invention;

Figure 25 is the schematic diagram comprising the reflector of light source, processor, battery and charging circuit according to exemplary embodiment of the present invention;

Figure 26 is the schematic diagram comprising the reflector of light source, processor, battery, charging circuit and transducer according to exemplary embodiment of the present invention;

Figure 27 is the schematic diagram comprising the reflector of light source, processor, battery, charging circuit, transducer and memory according to exemplary embodiment of the present invention;

Figure 28 is the schematic diagram of the device for obtaining information according to exemplary embodiment of the present invention;

Figure 29 is the schematic diagram being integrated in the transducer in ring according to exemplary embodiment of the present invention;

Figure 30 be according to exemplary embodiment of the present invention be integrated in battery powered can the schematic diagram of reflector among wearable electronic device;

Figure 31 is the schematic diagram comprising the reflector of two or more light sources and microprocessor according to exemplary embodiment of the present invention;

Figure 32 is the schematic diagram comprising the reflector of two or more light source, microprocessor and driver according to exemplary embodiment of the present invention;

Figure 33 is the schematic diagram comprising the reflector of microprocessor and battery charger according to exemplary embodiment of the present invention;

Figure 34 is the schematic diagram comprising the reflector of microprocessor, battery charger and memory according to exemplary embodiment of the present invention;

Figure 35 is the schematic diagram comprising the reflector of microprocessor, battery charger, memory and transducer according to exemplary embodiment of the present invention;

Figure 36 is the schematic diagram comprising the reflector of microprocessor, battery charger, memory, transducer and network adapter according to exemplary embodiment of the present invention;

Figure 37 be according to the explanation reflector of exemplary embodiment of the present invention and for obtain information from visible light signal the device comprising imageing sensor between the schematic diagram of communication;

Figure 38 is the flow chart sending the method for visible light signal according to the reflector of exemplary embodiment of the present invention;

Figure 39 is the flow chart receiving the method for visible light signal according to the imageing sensor of exemplary embodiment of the present invention;

Figure 40 is the flow chart of the navigation system based on visible light signal according to exemplary embodiment of the present invention.

Embodiment

Below with reference to accompanying drawings exemplary embodiment of the present disclosure is described in more detail.Although show exemplary embodiment of the present disclosure in accompanying drawing, however should be appreciated that can realize the disclosure in a variety of manners and not should limit by the embodiment set forth here.On the contrary, provide these embodiments to be in order to more thoroughly the disclosure can be understood, and complete for the scope of the present disclosure can be conveyed to those skilled in the art.

According to a first aspect of the invention, the method for a kind of utilization from the visible light signal transmission information of light source is provided.Fig. 1 is according to the utilization of the exemplary embodiment of the present invention flow chart from the method 100 of the visible light signal transmission information of light source.

As shown in Figure 1, method 100 starts from step 110, based on information waiting for transmission, modulate two or more drive singal of described light source, to obtain two or more modulated drive signal for driving described light source to launch the visible light signal of two or more wavelength, the level of described modulated drive signal changes between high level and low level with different frequencies and/or different phase places and/or different amplitudes.

According to exemplary embodiment of the present invention, light source can be any light source launching visible light signal, such as, and LED, fluorescent lamp or incandescent lamp.

According to exemplary embodiment of the present invention, the information transmitted by visible light signal can be the information of any type, such as, data, as text, image, audio frequency, video data, the identifier of light source, or other information.

According to exemplary embodiment of the present invention, light source can comprise different light-emitting components, to send the visible light signal of two or more wavelength of color fringe pattern.Such as, light source can comprise redness (R), green (G) or blue (B) light-emitting component and can be driven the light sending RGB color, it can be shot for by imageing sensor the image comprising colour (red, green, yellow, blue, powder, green grass or young crops, white, black) candy strip, and wherein different color representatives comprises the different code of information to be transmitted.

According to exemplary embodiment of the present invention, the drive singal of light source can be the form of square wave, sine wave, triangular wave, high frequency carrier or other ripples, and above-mentioned ripple comprises DC component.

According to exemplary embodiment of the present invention, two or more drive singal of pulse width modulation (PWM) method modulated light source can be used.Usually, the duration of pulse is fixing, can the duty ratio of modulation signal, the ratio of the duration (duration of positive part) that the duty ratio (such as square wave) of one of them pulse period is positive pulse and total duration.

According to exemplary embodiment of the present invention, step 110 can comprise: based on information waiting for transmission, modulate two or more driving voltages or two or more drive currents of described light source, to obtain first group of modulation driving voltage or first group of modulation drive current.First modulation driving voltage or the first modulation drive current can be used for the modulated drive signal that driving light source launches the visible light signal of two or more wavelength of color fringe pattern, and the level of described visible light signal changes between high level and low level with different frequencies and/or different phase places and/or different amplitudes.

According to exemplary embodiment of the present invention, step 110 can comprise: the frequency of modulation two or more drive singal described and/or phase place and/or amplitude are (namely, one in frequency, phase place and amplitude, two or three), to obtain two or more modulated drive signal.

According to exemplary embodiment of the present invention, on-off keying (OOK) method can be used to modulate the drive singal being used for driving light source.Fig. 2 is the schematic diagram of the drive singal for driving light source with the modulation of OOK method according to exemplary embodiment of the present invention.Based on information waiting for transmission, be used for the modulation of OOK method the drive singal that driving comprises redness (R), first light source of green (G) or blue (B) light-emitting component, secondary light source and the 3rd light source, make it change between " 1 " and " 0 ".Alternatively, drive singal can be drive current or driving voltage, and based on information waiting for transmission, can modulate the drive current/voltage for driving three light sources, as shown in Figure 2, to obtain first group of modulation drive current.By first group of modulation drive current/voltage driven, three light sources can distinguish the visible light signal of the RGB color that launching electrical level changes between high level and low level with different frequencies.

In different time interval 1-8, there is the various combination of the visible light signal of different colours, the different color fringes shown in synthetic image.Such as, in the time interval 1, the first light source and secondary light source are in " 0 ", and the 3rd light source is in " 1 ", and the only blueness sent is the color of the 3rd light source.In the time interval 3, the first light source is in " 0 ", and secondary light source and the 3rd light source are in " 1 ", the only cyan sent, is the color of secondary light source and the 3rd light source.

Fig. 3 A is the schematic diagram of the drive singal for driving light source with the modulation of OOK method according to another exemplary embodiment of the present invention.By modulated drive signal, obtain the drive singal being used for driving respectively the first light source, secondary light source and the 3rd light source that comprise redness (R), green (G) or blue (B) light-emitting component.Alternatively, based on information waiting for transmission, the available drive current of OOK method modulation for driving three light sources as shown in Figure 3A, to obtain first group of modulation drive current.By first group of modulation drive current/voltage driven, three light sources can distinguish the visible light signal of the RGB color that launching electrical level changes between high level and low level with different frequencies.Alternatively, the driving voltage for driving three light sources can be modulated, to obtain first group of modulation driving voltage, the visible light signal of the RGB color changed between high level and low level with different frequencies for driving three light source launching electrical levels.

Some embodiments of the present invention describe in detail when first, second, and third light source comprises redness (R), green (G) or blue (B) light-emitting component respectively.It will be understood by those skilled in the art that these rgb light sources are only exemplary, scope of the present invention is not limited thereto.Further, the number of light source is not limited to three.

As shown in Figure 1, after above-described step 110, the step 120 of manner of execution 100, namely, based on two or more modulated drive signal described, launch the visible light signal of two or more wavelength, to transmit described information, the level of described visible light signal changes between high level and low level with different frequencies and/or different phase places and/or different amplitudes, and described information corresponds to the pattern of the color fringe shown from the image that described visible light signal obtains.

According to exemplary embodiment of the present invention, the color fringe in described image obtains from the combination of the visible light signal of two or more wavelength of color fringe pattern.

According to exemplary embodiment of the present invention, the information corresponding to the pattern of color fringe comprises data bit, and described data bit comprises corresponding to the number of described color fringe, color, brightness or the data that put in order.

Refer again to Fig. 3 A, in different time interval 1-8, have the various combination of the visible light signal of different colours, the different color fringes shown in synthetic image.Such as, in the time interval 3, the first light source and the 3rd light source are closed, the only green launched, be the color of secondary light source, obtain the color fringe C corresponding to the green glow launched in the time interval 3 in the picture, as shown in Figure 3 B, wherein different colors is represented with different patterns.In the time interval 5, the first light source and secondary light source are closed, the only blueness of launching, is the color of the 3rd light source, obtains the color fringe E corresponding to the blue light launched in the time interval 5 in the picture, as shown in Figure 3 B.In the time interval 7, the first light source is closed, and the only pink colour of launching is the blend color of secondary light source and the 3rd light source, obtains the color fringe G corresponding to the powder light launched in the time interval 7 in the picture, as shown in Figure 3 B.

Similarly, being driven by a first as shown in Figure 3A group modulation drive current, the visible light signal that three light sources are launched can have 8 kinds of different combinations in the 1-8 of different time interval, as shown in Figure 3A.From 8 kinds of combinations of three light sources, generate 8 (2 ³=8) pattern of color fringe A-H, as shown in Figure 3 B, each striped represents 3 bits (namely 000,001,010,011,100,101,110 or 111), therefore, can be transmitted the information of 8*3=24 bit by this pattern.

According to exemplary embodiment of the present invention, in pattern, the width of striped is determined by the highest frequency in light source.Such as, in the pattern shown in Fig. 3 B, the width of striped is determined by the frequency of the first light source, and the frequency of the first light source is the highest frequency in first, second, and third light source.

Alternatively, the frequency of drive singal can otherwise be adjusted, to obtain modulated drive signal.Fig. 4 is according to the modulation of another exemplary embodiment of the present invention schematic diagram for the modulated drive signal of driving light source.As shown in Figure 4, modulate the frequency of the drive singal of each light source, make the drive singal of light source have different frequencies in different time interval.Alternatively, the visible light signal driven by the drive singal of different frequency can represent different code elements, such as, the visible light signal driven by the drive singal of upper frequency can represent code element " 1 ", and the visible light signal driven by the drive singal of lower frequency can represent code element " 0 ".Compared with Fig. 3 A, the visible light signal that three light sources are launched can have more how different combinations in the 1-8 of different time interval.From more kinds of combinations of three light sources, generate the pattern (not shown) of more color fringe, therefore, the information of more bits can be transmitted.

According to exemplary embodiment of the present invention, the amplitude also by modulated drive signal obtains the modulated drive signal being used for driving light source.

Fig. 5 is the schematic diagram of the drive singal for driving light source according to exemplary embodiment of the present invention.By the amplitude of modulated drive signal, obtain the drive singal being used for driving respectively the first light source, secondary light source and the 3rd light source that comprise redness (R), green (G) or blue (B) light-emitting component.Three light sources can launch the visible light signal of different colours and varying strength.By the amplitude of the drive singal of modulated light source, the visible light signal with different amplitude can be obtained.Driven by first group of modulation drive current, three light sources can distinguish the visible light signal of the RGB color that launching electrical level changes between high level and low level with different amplitudes.

Driven by first group of modulation drive current, light source can launch the visible light signal of the different colours with different amplitude.In different time interval 1-8, there is the various combination of the visible light signal of different colours, the different color fringes shown in synthetic image.Such as, the drive current of each light source can be modulated to, in different time interval, there are 8 kinds of amplification level.From being set to the buttoned-up status of 0 to the complete opening being set to 1,8 kinds of levels be evenly distributed and be expressed as L1, L2 ..., L7 and L8.Alternatively, in OOK modulation, the drive current of each light source can be modulated to, in different time interval, there are 2 kinds of amplification level, that is, be set to the buttoned-up status of 0 to the complete opening being set to 1.

In the time interval 2, it is the visible ray of L4 that the first light source R launches amplitude, provides visible light signal 1L4; It is the visible ray of L8 that secondary light source G launches amplitude, provides visible light signal 2L8; It is the visible ray of L2 that 3rd light source B launches amplitude, provides visible light signal 3L2.In the time interval 2, the visible light signal launched by three light sources is the combination of 1L4,2L8 and 3L2, corresponding to the striped of in image.

In the time interval 5, it is the visible ray of L2 that the first light source R launches amplitude, provides visible light signal 1L2; It is the visible ray of L6 that secondary light source G launches amplitude, provides visible light signal 2L6; It is the visible ray of L8 that 3rd light source B launches amplitude, provides visible light signal 3L8.In the time interval 5, the visible light signal launched by three light sources is the combination of 1L2,2L6 and 3L8, corresponding to the striped of in image.

Each of three light sources has 8 kinds of different amplification level, and the visible light signal launched by light source exists 8 ³=512 kinds of different combinations.From 512 kinds of combinations of three light sources, can generate the pattern (not shown) of 512 color fringes, each striped represents 9 bits.It will be understood by those skilled in the art that the number of light source is not limited to three, can be two, a four or more light source.When having the light source of n different colours and each light source has m kind amplification level, m can be generated ⁿthe pattern of individual different color fringe, each striped represents n*log ₂m bit.

According to exemplary embodiment of the present invention, the phase place also by modulated drive signal obtains the modulated drive signal being used for driving light source.

Fig. 6 is the schematic diagram of the drive singal for driving light source according to exemplary embodiment of the present invention.By the phase place of modulated drive signal, obtain the modulated drive signal being used for driving respectively the first light source, secondary light source and the 3rd light source that comprise redness (R), green (G) or blue (B) light-emitting component.Three light sources can launch the visible light signal of different colours and out of phase.By the phase place of the drive current of modulated light source, the visible light signal with out of phase can be obtained.Driven by first group of modulation drive current, three light sources can distinguish the visible light signal of the RGB color that launching electrical level changes between high level and low level with different phase places.

Driven by first group of modulation drive current, light source can launch the visible light signal of the different colours with out of phase.In different time interval 1-8, there is the various combination of the visible light signal of different colours, the different color fringes shown in synthetic image.

Such as, as shown in Figure 6, in the time interval 1, the first light source R is from secretly brightening, and secondary light source G is from secretly brightening, and the 3rd light source B is from bright dimmed, and therefore, the visible ray launched from three light sources becomes yellow from blueness.In the time interval 3, the first light source R is from secretly brightening, and secondary light source G is from bright dimmed, and the 3rd light source B is from bright dimmed, and therefore, the visible ray launched from three light sources becomes redness from cyan.

Each of three light sources has 2 kinds of different changes, that is, from bright dimmed and from secretly brightening, the visible light signal launched by three light sources exists 2 ³=8 kinds of different combinations.From 8 kinds of combinations of three light sources, can generate the pattern (not shown) of 8 different color fringes, each striped represents 3 bits (that is, 000,001,010,011,100,101,110 or 111).It will be understood by those skilled in the art that the number of light source is not limited to three, can be two, a four or more light source.It will be understood by those skilled in the art that the above-mentioned change of light source obtained by adjustment drive singal, that is, from bright dimmed and from secretly brightening, is only the object in order to illustrate, instead of limitation of the present invention.According to embodiments of the invention, by adjusting the phase place of drive singal, light source can have other changes, such as, from bright to bright and from secretly to secretly, and the wherein phase invariant of drive singal.When having the light source of n different colours and each light source has the change of m kind, m can be generated ⁿthe pattern of individual different color fringe, each striped represents n*log ₂m bit.

According to exemplary embodiment of the present invention, by two or three in the frequency of modulated drive signal, phase place and amplitude, obtain the modulated drive signal being used for driving light source.

According to exemplary embodiment of the present invention, by frequency and the amplitude of modulated drive signal, obtain the modulated drive signal being used for driving light source.

Fig. 7 is the schematic diagram of the modulated drive signal for driving a light source according to exemplary embodiment of the present invention.By the amplitude of modulated drive signal, obtain modulated drive signal, make modulated drive signal have different amplitudes in different time interval.Driven by this modulation drive current, three light sources can launch the light of varying strength at different time interval, and can photograph the pattern of the striped of different brightness in the picture, as shown in Figure 8.Such as, in the time interval 1 ', light source is closed, and the intensity of light is 0%; Meanwhile, the striped A ' that brightness is 0% is obtained in the picture, as shown in Figure 8.In the time interval 2 ', the intensity of light is 12.5%; Meanwhile, the striped B ' that brightness is 12.5% is obtained in the picture, as shown in Figure 8.In the time interval 3 ', the intensity of light is 25%; Meanwhile, obtain the striped C ' that brightness is 25% in the picture, as shown in Figure 8, etc.Modulated drive signal as shown in Figure 7 drives, and the visible light signal launched of light source can at different time interval 1 '-8 ' in generate the pattern with striped the A '-H ' of 8 kinds of different luminance levels, as shown in Figure 8.

When being obtained by modulating frequency for driving the drive singal of three light sources of three kinds of colors, 2 shown in Fig. 3 can be obtained ³the striped of=8 different colours, (namely each striped represents 3 bits, 000,001,010,011,100,101,110 or 111) luminance level that as shown in Figure 88 kinds are different, and modulated for the amplitude of each drive singal driving each light source, is provided.

Alternatively, also by phase place and the amplitude of modulated drive signal, obtain the modulated drive signal being used for driving light source.

Fig. 9 is the schematic diagram of the modulated drive signal for driving light source according to exemplary embodiment of the present invention.By phase place and the amplitude of modulated drive signal, obtain the modulated drive signal being used for driving respectively the first light source, secondary light source and the 3rd light source that comprise redness (R), green (G) or blue (B) light-emitting component.Three light sources can launch the visible light signal of different colours, different amplitude and out of phase.By phase place and the amplitude of the drive current of modulated light source, the visible light signal with out of phase and amplitude can be obtained.Driven by first group of modulation drive current, light source can launch the visible light signal of the different colours with out of phase and different amplitude.In different time interval 1-8, there is the various combination of the visible light signal of different colours, the different color fringes shown in synthetic image.

Such as, in the time interval 3, it is the visible ray of L5 that the first light source R launches amplitude, provides visible light signal 1L5; It is the visible ray of L3 that secondary light source G launches amplitude, provides visible light signal 2L3; It is the visible ray of L3 that 3rd light source B launches amplitude, provides visible light signal 3L3; Meanwhile, the first light source R is from secretly brightening, and secondary light source G is from bright dimmed, and the 3rd light source B is from bright dimmed.Therefore, in the time interval 3, the visible light signal launched by three light sources is the combination of the visible light signal of different colours, the specific color fringe shown in synthetic image.

In the time interval 7, it is the visible ray of L5 that the first light source R launches amplitude, provides visible light signal 1L5; It is the visible ray of L7 that secondary light source G launches amplitude, provides visible light signal 2L7; It is the visible ray of L4 that 3rd light source B launches amplitude, provides visible light signal 3L4; Meanwhile, the first light source R is from secretly brightening, and secondary light source G is from bright dimmed, and the 3rd light source B is from secretly brightening.Therefore, in the time interval 7, the visible light signal launched by three light sources is the combination of the visible light signal of different colours, another the specific color fringe shown in synthetic image.

Each of three light sources has 512 kinds of different combinations by modulation amplitude, and (namely each have 2 kinds of different changes by phase modulation, from bright dimmed and from secretly brightening), there is the different combination of 512*8=4096 kind in the visible light signal launched in different time interval 1-8 by three light sources.From 4096 kinds of combinations of three light sources, can generate the pattern (not shown) of 4096 different color fringes, each striped represents 12 bits.It will be understood by those skilled in the art that the number of light source is not limited to three, can be two, a four or more light source.When having the light source of n different colours and each light source has the change of m kind, by modulation amplitude and phase place, m can be generated ⁿthe pattern of individual different color fringe, each striped represents n*log ₂m bit.

Alternatively, also by frequency and the amplitude of modulated drive signal, obtain the modulated drive signal being used for driving light source.

Figure 10 is the schematic diagram of the modulated drive signal for driving light source according to exemplary embodiment of the present invention.By frequency and the amplitude of modulated drive signal, obtain the modulated drive signal being used for driving respectively the first light source, secondary light source and the 3rd light source that comprise redness (R), green (G) and blue (B) light-emitting component.Three light sources can launch the visible light signal of different colours, different amplitude and different frequency.By frequency and the amplitude of the drive current of modulated light source, visible light signal can be obtained.By the amplitude at time interval internal modulation drive current, three light sources can launch the visible light signal of the different colours with different brightness.Meanwhile, by modulating the frequency of drive current, the number of times of light source change between bright and dark can be controlled within this time interval.Alternatively, when light source changes between bright and dark with the frequency of the sample frequency lower than imageing sensor within a time interval, such as, only from dark to bright change once, in the image captured by imageing sensor, generate the color fringe that a brightness corresponds to the amplitude of the high level of drive current in this time interval, or the low level dark fringe that corresponds to drive current in this time interval.Alternatively, when light source changes between bright and dark with the frequency of the sample frequency higher than imageing sensor within a time interval, in captured image, generate a brightness corresponding to the color fringe lower than the intermediate amplitude of the high level of drive current in this time interval.Driven by first group of modulation drive current, light source can launch the visible light signal of the different colours with different frequency and different amplitude.In different time interval 1-8, there is the various combination of the visible light signal of different colours, the different color fringe shown in synthetic image.

Such as, in the time interval 2, it is the visible ray of L8 that the first light source R launches amplitude, provides visible light signal 1L8; It is the visible ray of L5 that secondary light source G launches amplitude, provides visible light signal 2L5; It is the visible ray of L3 that 3rd light source B launches amplitude, provides visible light signal 3L3; In the time interval 2, the first light source R has low frequency and change between bright and dark lentamente, and secondary light source G has low frequency and change between bright and dark lentamente, and the 3rd light source B has high-frequency and change between bright and dark rapidly.In the time interval 2, the visible light signal launched by three light sources is the combination of the visible light signal of different colours.3rd light source B changes rapidly between bright and dark, generates a brightness in the picture corresponding to the color fringe lower than the intermediate amplitude of the high level of drive current in the time interval 2.First light source and secondary light source change lentamente within the time interval 2 between bright and dark, generate one in the picture from the color fringe secretly brightened.

In the time interval 5, it is the visible ray of L6 that the first light source R launches amplitude, provides visible light signal 1L6; It is the visible ray of L8 that secondary light source G launches amplitude, provides visible light signal 2L8; It is the visible ray of L8 that 3rd light source B launches amplitude, provides visible light signal 3L8; In the time interval 5, the first light source R has low frequency and change between bright and dark lentamente, and secondary light source G has low frequency and change between bright and dark lentamente, and the 3rd light source B has low frequency and change between bright and dark lentamente.In the time interval 5, the visible light signal launched by three light sources is the combination of the visible light signal of different colours, generates another specific color fringe in the picture, and in the time interval 5, its color is change.

By 512 kinds of modulation amplitude different combinations and by 8 kinds of modulating frequency different combinations, there is the different combination of 512*8=4096 kind in the visible light signal launched in different time interval 1-8 by three light sources.From 4096 kinds of combinations of three light sources, can generate the pattern (not shown) of 4096 different color fringes, each striped represents 12 bits.It will be understood by those skilled in the art that the number of light source is not limited to three, can be two, a four or more light source.When having the light source of n different colours and each light source has the change of m kind, by modulation amplitude and frequency, m can be generated ⁿthe pattern of individual different color fringe, each striped represents n*log ₂m bit.

Alternatively, also by frequency and the phase place of modulated drive signal, obtain the modulated drive signal being used for driving light source.

Figure 11 is the schematic diagram of the modulated drive signal for driving light source according to exemplary embodiment of the present invention.By frequency and the phase place of modulated drive signal, obtain the modulated drive signal being used for driving respectively the first light source, secondary light source and the 3rd light source that comprise redness (R), green (G) and blue (B) light-emitting component.Three light sources can launch the visible light signal of different colours, out of phase and different frequency.By frequency and the phase place of the drive current of modulated light source, visible light signal can be obtained.By the phase place at time interval internal modulation drive current, light source can be controlled and launch from bright dimmed and from the visible light signal secretly brightened.Meanwhile, by modulating the frequency of drive current, the number of times of light source change between bright and dark can be controlled within this time interval.Alternatively, when light source changes between bright and dark with the frequency lower than imageing sensor sample frequency within a time interval, such as, only from dark to bright change once, in the image captured by imageing sensor, generate the color fringe that a brightness corresponds to the amplitude of the high level of drive current in this time interval, or the low level dark fringe that corresponds to drive current in this time interval.Alternatively, when light source changes between bright and dark with the frequency of the sample frequency higher than imageing sensor within a time interval, in captured image, generate a brightness corresponding to the color fringe lower than the intermediate amplitude of the high level of drive current in this time interval.Driven by first group of modulation drive current, light source can launch the visible light signal of the different colours with different frequency and out of phase.In different time interval 1-8, there is the various combination of the visible light signal of different colours, the different color fringe shown in synthetic image.

Such as, in the time interval 2, the first light source R has high-frequency and from bright dimmed, and secondary light source G has high-frequency and from bright dimmed, and the 3rd light source B has high-frequency and from secretly brightening.In the time interval 2, the visible light signal launched by three light sources is the combination of the visible light signal of different colours, generates specific color fringe in the picture, and in the time interval 2, its color is change.

In the time interval 3, the first light source R has high-frequency and from bright dimmed, and secondary light source G has high-frequency and from bright dimmed, and the 3rd light source B has low frequency and from secretly brightening.In the time interval 3, the visible light signal launched by three light sources is the combination of the visible light signal of different colours, generates another specific color fringe in the picture, and in the time interval 3, its color is change.

In the time interval 6, the first light source R has high-frequency and from secretly brightening, and secondary light source G has low frequency and from secretly brightening, and the 3rd light source B has low frequency and from bright dimmed.In the time interval 6, the visible light signal launched by three light sources is the combination of the visible light signal of different colours, generates the different color fringe shown in the picture, and in the time interval 6, its color is change.

By phase modulation, each of three light sources from bright dimmed or from secretly brightening, can provide 2 ³=8 kinds of different changes.By modulating frequency, each had low frequency of three light sources or high-frequency, provide 2 ³=8 kinds of different changes.

According to exemplary embodiment of the present invention, except data bit, the information corresponding to the pattern of color fringe also comprises one or more start bit and/or one or more error correction bit.Start bit can be used for the original position of identification one group of data bit, and error correction bit can be used for checking the mistake in described data bit.

Figure 12 is the schematic diagram corresponding to the information of the pattern of color fringe according to exemplary embodiment of the present invention, and it comprises a start bit.As shown in figure 12, a start bit is added in the starting position of data bit.Alternatively, also multiple start bit can be comprised.

Figure 13 is the schematic diagram corresponding to the information of the pattern of color fringe according to exemplary embodiment of the present invention, and it comprises a start bit and an error correction bit.As shown in figure 13, except start bit, also error correction bit can be added at the end of data bit.Alternatively, multiple error correction bit can be comprised.Alternatively, one or more error correction bit can be joined data bit, and not add start bit.

According to exemplary embodiment of the present invention, described first group of modulation drive current is greater than unmodulated drive current respectively, makes the luminous flux of the light source driven by described first group of modulation drive current equal the luminous flux of the light source driven by described unmodulated drive current.

Luminous flux is the amount of the power of the light that unit interval inner light source is launched, and is directly proportional to the area under drive current ripple, and human eye is to the sensitive of luminous flux.Driving light source can be carried out with the first modulation drive current being greater than unmodulated drive current, make the luminous flux of light source be constant during whole information transmission, to avoid flicker.

Figure 14 A is the schematic diagram equaling the modulation drive current of the light source of unmodulated drive current according to an illustrative embodiment of the invention.Can suppose that the luminous flux of the light source driven by unmodulated drive current is 100%.Suppose to modulate the high level of drive current and low level width is 0.1ms respectively, and modulation drive current equals unmodulated drive current, then the luminous flux of the light source driven by the modulation drive current shown in Figure 14 A can be calculated as (0.1*0+0.1*1) * 100%/(0.1+0.1)=50%.The luminous flux 50% of the light source driven by modulation drive current, lower than the luminous flux (100%) of the light source driven by unmodulated drive current, causes the undesirable light source scintillation can experienced by human eye.

Figure 14 B is the schematic diagram being greater than the modulation drive current of unmodulated drive current according to an illustrative embodiment of the invention.Still suppose to modulate the high level of drive current and low level width is 0.1ms respectively, and modulation drive current is the twice of unmodulated drive current, then the luminous flux of the light source driven by the modulation drive current shown in Figure 14 B can be calculated as (0.1*0+0.1*2) * 100%/(0.1+0.1)=100%.The luminous flux 100% of the light source driven by modulation drive current equals the luminous flux of the light source driven by unmodulated drive current, avoids the undesirable light source scintillation can experienced by human eye.Should be understood that numerical value provided in an exemplary embodiment of the present invention is the theoretical value for illustration of object, instead of actual numerical value.Actual numerical value can change because of distinct device parameter.

According to exemplary embodiment of the present invention, alternatively, method 100 can comprise step: based on second group of modulation drive current with high-frequency carrier signal, launch described visible light signal, described second group of modulation drive current is greater than unmodulated drive current, makes the light source that driven by described second group of modulation drive current comprising high level and the luminous flux in low level each cycle is constant

Figure 14 C is according to an exemplary embodiment of the present invention without the modulation drive current being greater than unmodulated drive current of high-frequency carrier signal.As shown in Figure 14 C, drive current can be modulated to the different cycles having and comprise different high level and low level arrangement, to represent different code elements.Alternatively, in different cycles, high level and low level can have the different duration, to transmit different code elements, cause the luminous flux of the power supply driven by modulation drive current different, cause light source scintillation.Such as, as shown in Figure 14 C, in the one-period T1 representing code element " 1 ", drive current is modulated into high level total duration and is luminous flux is 50%; In another cycle T 2 representing code element " 0 ", drive current is modulated into high level total duration and is luminous flux is 66.7%.Therefore, the luminous flux in the T1 of transmitted symbol " 1 " is less than the luminous flux in the T2 of transmitted symbol " 0 ", causes light source scintillation.

In order to avoid transmit different code element time light source flicker, the drive current being greater than unmodulated drive current is modulated with high-frequency carrier signal further.By modulating with high-frequency carrier signal, in different cycles, duration for transmitting the high level of the drive current of different code element is identical with the low level duration, then comprising high level and the luminous flux in low level each cycle is constant, thus avoid light source scintillation.Such as, as shown in fig. 14d, in the one-period T1 of transmitted symbol " 1 ", drive current is modulated into high level total duration with high-frequency carrier signal further and is 66.7%, luminous flux is 33.3%; In the one-period T2 of transmitted symbol " 0 ", drive current is modulated into high level total duration with high-frequency carrier signal further and is luminous flux is 33.3%.Therefore, the luminous flux in the T1 of transmitted symbol " 1 " equals the luminous flux in the T2 of transmitted symbol " 0 ", avoids the less desirable light source scintillation that can be arrived by human eye detection.

It will be understood by those skilled in the art that high level and low level frequency, waveform or the width of modulation drive current are not limited to above-mentioned exemplary numerical value, and any numerical value can be arranged to as required.Similarly, the high level of high-frequency carrier signal and low level frequency, waveform or width are not limited to above-mentioned exemplary numerical value, and can be arranged to any numerical value as required.

According to a second aspect of the invention, a kind of method utilizing visible light signal obtaining information is provided.Figure 15 utilizes flow chart from the method 200 of the visible light signal obtaining information of two or more wavelength of light source according to the explanation of exemplary embodiments of the present invention.

As shown in figure 15, method 200 starts from step 210, the described visible light signal of two or more wavelength launched from light source obtains image, and the level of described visible light signal changes between high level and low level with different frequencies and/or different phase places and/or different amplitudes.

According to exemplary embodiment of the present invention, as described in detail in above about the content of method 100, visible light signal can be launched by the light source based on modulated drive signal, modulated drive signal drives described light source to launch visible light signal, and the level of described visible light signal changes between high level and low level with different frequencies and/or different phase places and/or different amplitudes.

According to exemplary embodiment of the present invention, as described in detail in above about the content of method 100, obtain modulated drive signal by the frequency of modulated drive signal and/or phase place and/or amplitude, launch visible light signal for driving light source.Alternatively, the drive singal of PWM method modulated light source can be used.Alternatively, modulated drive signal can be modulation drive current or modulation driving voltage.

Alternatively, as described in detail in above about the content of method 100, with reference to figure 14B, modulation drive current can be greater than unmodulated drive current, and the luminous flux of the light source driven by modulation drive current is equaled by the luminous flux of the light source of described unmodulated current drives.

Alternatively, as described in detail in above about the content of method 100, with reference to figure 14C and 14D, visible light signal can be launched based on the modulation drive current with high frequency carrier, modulation drive current is greater than unmodulated signal, makes the light source that driven by this modulation drive current comprising high level and the luminous flux in low level each cycle is constant.

Above-mentioned exemplary embodiment is described in detail about in the content of method 100 above, in order to concise and to the point object does not repeat them here.

According to exemplary embodiment of the present invention, the image obtained from visible light signal can be the image of the pattern comprising color fringe.Such as, for the light source comprising redness (R), green (G) or blue (B) light-emitting component, image can comprise the image of colour (red, green, yellow, blue, powder, green grass or young crops, white, black) candy strip, wherein different color representatives comprises the different code of information to be transmitted, as shown in figure 16.

According to exemplary embodiment of the present invention, step 210 can comprise and obtains described image by the image capturing device comprising imageing sensor, the exposure mode of described imageing sensor is rolling shutter mode, and the sample frequency of Rolling shutter is higher than the frame rate of described imageing sensor.Image capturing device is for taking the image of the visible light signal acquisition of launching from light source.Image capturing device can be smart mobile phone, notebook computer or other electronic equipments with camera.Alternatively, image capturing device can be integrated in other equipment or object, such as, embedded system in jewelry, key, card, pen etc.Imageing sensor can be light-sensitive element.

According to exemplary embodiment of the present invention, be the different piece of the imageing sensor of Rolling shutter, imageing sensor for exposure mode, every a line or each row, can expose at different time.When the image of the fast-changing light source that the modulated drive signal of taking as shown in Figure 2 drives, imageing sensor can obtain the image of the pattern comprising color fringe as shown in Figure 3.Alternatively, when the image of the fast-changing light source that the modulated drive signal of taking as shown in Figure 7 drives, imageing sensor can obtain the image of the pattern of the color fringe comprising different luminance level as shown in Figure 8.

According to exemplary embodiment of the present invention, the sample frequency of Rolling shutter is higher than the frame rate of imageing sensor, and to obtain the picture rich in detail comprising color fringe pattern, wherein each striped corresponds to every a line.Such as, when the frame rate of imageing sensor is 30Hz and resolution is 640*480, the time of taking needed for an image is 1s/30Hz=0.033s=33ms, and the time of taking needed for every a line is 33ms/480=69us.In order to obtain the image clearly comprising color fringe pattern, wherein each striped correspond to every a line, the time for exposure of every a line be less than 69us and sample frequency higher than 30Hz.

According to exemplary embodiment of the present invention, step 210 can comprise: image described in the imageing sensor photographs with Rolling shutter, the different piece of wherein said imageing sensor exposes in different time points.Alternatively, imageing sensor can be complementary metal oxide semiconductors (CMOS) (CMOS) imageing sensor or charge coupled device (CCD) imageing sensor.

As shown in figure 15, after abovementioned steps 210, the step 220 of manner of execution 200, measures the pattern from the color fringe the described image that described visible light signal obtains.

According to exemplary embodiment of the present invention, by, such as image processor or general processor, measure the pattern of the color fringe the image obtained from visible light signal.After image projection to image sensor surface, the light signal detected is converted to the signal of telecommunication by imageing sensor.Digital signal is converted electrical signals to by the analog-digital converter (ADC) of imageing sensor or processor.Processor is used for further processing digital signal, and generates digital picture, and it can show over the display.Alternatively, the Digital Signal Processing (DSP) of processor may be used for processing digital signal and generates digital picture.

As shown in figure 15, after above-mentioned steps 220, the step 230 of manner of execution 200, obtains the information of the pattern corresponding to described color fringe.

According to exemplary embodiment of the present invention, the information corresponding to the pattern of described color fringe can be the information of any type, such as, data, as text, image, audio frequency, video data, the identifier of light source, or other information.

According to exemplary embodiment of the present invention, the color fringe in described image obtains from the combination of the visible light signal of two or more wavelength.According to exemplary embodiment of the present invention, decodable code, alternatively, obtains from the combination of the visible light signal of two or more wavelength, corresponding to the information of the pattern of color fringe.In this way, the initial information of visible light signal carrying can be recovered.

As shown in Figure 3, from driven by modulated drive signal respectively, three light sources launching the visible ray of RGB color, the image taken by imageing sensor can be generated.When the information of the pattern corresponding to color fringe of decoding, be the measurement based on these three kinds of colors to the analysis of captured image.Such as, striped A relates to the first signal, and the brightness of three kinds of colors is respectively 0%, 0%, 0%, and the waveform of its decoding corresponds to the waveform in the time interval 1 shown in Fig. 2; Striped B relates to secondary signal, and the brightness of three kinds of colors is respectively 100%, 0%, 0%, and the waveform of its decoding corresponds to the waveform in the time interval 2 shown in Fig. 2; Striped C relates to the 3rd signal, and the brightness of three kinds of colors is respectively 0%, 100%, 0%, and the waveform of its decoding corresponds to the waveform in the time interval 3 shown in Fig. 2.Similarly, other stripeds of decodable code, to obtain transmitted information.

According to exemplary embodiment of the present invention, as shown in Figure 8, from the light source that the modulated drive signal by the amplitude by modulated drive signal drives, the image taken by imageing sensor can be generated.When the information of the pattern corresponding to color fringe of decoding, be the measurement based on brightness to the analysis of captured image.Such as, striped A ' relates to the first signal that brightness is 0%, and the waveform of its decoding corresponds to the waveform in the time interval 1 ' shown in Fig. 7; Striped B ' relates to the secondary signal that brightness is 12.5%, and the waveform of its decoding corresponds to the waveform in the time interval 2 ' shown in Fig. 7; Striped C ' relates to the 3rd signal that brightness is 25%, and the waveform of its decoding corresponds to the waveform in the time interval 3 ' shown in Fig. 7.Similarly, other stripeds of decodable code, to obtain transmitted information.

When the image captured by imageing sensor is three light sources generations from three kinds of colors, wherein by modulating the frequency of the drive singal driving these three light sources of modulation as shown in Figure 2, simultaneously by modulating the amplitude of the modulated drive signal of each light source as shown in Figure 8, the pattern of 64 stripeds with different colours and/or brightness can be obtained in the image captured by imageing sensor.When the information of the pattern corresponding to 64 stripeds of decoding, be the measurement based on these three kinds of colors above-mentioned and brightness to the analysis of captured image.

According to exemplary embodiment of the present invention, described light source is one or more groups light source, and the image obtained can have one or more exposure area, and each exposure area can comprise the pattern of the striped corresponding to one group of light source.

Figure 17 is the schematic diagram comprising the image of the one or more exposure areas corresponding to one or more groups light source according to exemplary embodiment of the present invention.In fig. 17, the image obtained has three exposure areas, and each exposure area comprises the pattern of striped as shown in figure 16, and it corresponds to one group of light source of three kinds of colors that modulated drive signal as shown in Figure 2 drives.

Step 210 can comprise: the described visible light signal launched from one or more groups light source described obtains image, the level of described visible light signal changes between high level and low level with different frequencies and/or different phase places and/or different amplitudes, and the one or more exposure areas in wherein said image correspond to one or more groups light source described.By the mode similar with the foregoing mode obtaining image from one group of light source, from the image with one or more exposure area that one or more groups light source obtains, image as shown in figure 17, in order to concise and to the point object, does not repeat them here.Further, step 220 can comprise: the pattern measuring the color fringe of one or more exposure area described in described image.By foregoing similar fashion, the pattern of the color fringe corresponding to each exposure area often organizing light source can be measured.Such as by the similar fashion as shown in 16, the pattern often organizing the color fringe of each exposure area of light source corresponding to three kinds of colors shown in Figure 17 can be measured respectively, in order to concise and to the point object, do not repeat them here.Further, step 230 can comprise: the information obtaining the described color fringe pattern of one or more exposure area described corresponded in described image.By the similar mode foregoing from one group of light source, the information of the pattern of the color fringe corresponding to each exposure area can be obtained respectively.Such as, by similar fashion as shown in Figure 16, the information often organizing the pattern of the color fringe of each exposure area of light source corresponding to three kinds of colors shown in Figure 17 can be obtained respectively, in order to concise and to the point object, do not repeat them here.

When the plane out of plumb of incident light and imageing sensor, projection light spot shape on the image sensor may be out of shape, such as, become ellipse from circle.In this case, accelerometer, gravity sensor, angular transducer, gyroscope or magnetometric sensor can be used to measure angle of inclination, it can be used for the information of the pattern obtaining the color fringe corresponding to one or more exposure area in image.

According to a third aspect of the invention we, a kind of light source 300 utilizing the visible light signal transmission information of two or more wavelength is provided.As shown in figure 18, light source 300 can be lamp, such as LED, LED backlight, LED planar lamp etc.But light source 300 is not limited to above-described embodiment, and can be any light source that can transmit visible light signal.

As shown in figure 18, light source 300 can comprise modulator 310 and reflector 320.Modulator 310 can be by the signal of telecommunication of constant current, constant voltage, constant electric power, constant optical power, or the modulator that the signal of telecommunication modulated by PWM method drives.Reflector 320 can be the LED that can launch different colours visible light signal, and different colours depends on the wavelength of launched visible light signal, and such as, wavelength is the ruddiness of 640-780nm, and wavelength is the green glow of 505-525nm, and wavelength is the blue light of 470-505nm.Drive for unidirectional LED, reflector 320 can be connect into a string one or more LED, comprises 1 to 12 LED.Alternatively, reflector 320 can be the one or more LED connecting into many strings, wherein often a stringly comprises 1 to 12 LED.According to exemplary embodiment of the present invention, reflector 320 comprises multiple LED.But modulator 310 or reflector 320 are not limited to above-described embodiment, and can be any modulator or reflector.

Modulator 310 can be used for based on information waiting for transmission, modulate two or more drive singal of described light source, to obtain two or more modulated drive signal for driving described light source to launch the visible light signal of two or more wavelength, the level of described modulated drive signal changes between high level and low level with different frequencies and/or different phase places and/or different amplitudes.

Reflector 320 can be used for based on two or more modulated drive signal described, launch the visible light signal of two or more wavelength, to transmit described information, the level of described visible light signal changes between high level and low level with different frequencies and/or different phase places and/or different amplitudes, and described information corresponds to the pattern of the color fringe shown from the image that described visible light signal obtains.

According to exemplary embodiment of the present invention, modulator 310 can be used for based on information waiting for transmission, modulate two or more driving voltages or two or more drive currents of described light source, to obtain first group of modulation driving voltage or first group of modulation drive current.

According to exemplary embodiment of the present invention, first group of modulation drive current is greater than unmodulated drive current respectively, makes the luminous flux of the light source driven by described first group of modulation drive current equal the luminous flux of the light source driven by described unmodulated drive current.

According to exemplary embodiment of the present invention, reflector 320 can be used for based on second group of modulation drive current with high-frequency carrier signal, launch described visible light signal, described second group of modulation drive current is greater than unmodulated drive current, makes the light source that driven by described second group of modulation drive current comprising high level and the luminous flux in low level each cycle is constant.

According to exemplary embodiment of the present invention, information corresponding to the pattern of color fringe also comprises one or more start bit and/or one or more error correction bit, described one or more start bit is for identifying the original position of one group of data bit, and described one or more error correction bit is for checking the mistake in described data bit.

According to exemplary embodiment of the present invention, modulator 310 can be used for modulating the frequency of two or more drive singal described and/or phase place and/or amplitude, to obtain two or more modulated drive signal.

According to exemplary embodiment of the present invention, the color fringe in described image obtains from the combination of the visible light signal of two or more wavelength.

According to the present invention, before to be also applicable to the embodiment of light source 300 about the detailed description of method 100, in order to concise and to the point object, do not repeat them here.Particularly, the step 110 in method 100 can be performed by modulator 310, and the step 120 in method 100 can be performed by reflector 320.

According to a forth aspect of the invention, a kind of device 400 for the visible light signal obtaining information from two or more wavelength from light source is provided.Such as, this device can be the mobile device comprising camera, such as smart mobile phone, panel computer, notebook computer or other electronic equipments.But device 400 is not limited to these embodiments, and can be any electronic equipment with light-sensitive element.

As shown in figure 18, for imageing sensor 410, memory 420 and processor 430 can be comprised from the device 400 of visible light signal obtaining information.Imageing sensor 410 can be, such as, and camera, photodiode, photodiode array.Memory 420 can be volatile memory, nonvolatile memory etc.Processor 430 can be general processor, application specific processor etc.

The described visible light signal that imageing sensor 410 can be used for two or more wavelength launched from light source obtains image, and the level of described visible light signal changes between high level and low level with different frequencies and/or different phase places and/or different amplitudes.Memory 420 can be used for the image storing the acquisition of described imageing sensor; And processor 430 can be used for the pattern of the color fringe measured in storage described image in which memory, and obtain the information of the pattern corresponding to described color fringe.

According to exemplary embodiment of the present invention, the exposure mode of described imageing sensor is rolling shutter mode, and the sample frequency of Rolling shutter is higher than the frame rate of described imageing sensor.

According to exemplary embodiment of the present invention, described imageing sensor 410 is imageing sensor with Rolling shutter and for obtaining image from visible light signal, the different piece of wherein said imageing sensor exposes in different time points.Alternatively, imageing sensor 410 can be complementary metal oxide semiconductors (CMOS) (CMOS) imageing sensor or charge coupled device (CCD) imageing sensor.

According to exemplary embodiment of the present invention, described visible light signal is launched based on modulated drive signal by described light source 300, described modulated drive signal drives described light source to launch described visible light signal, and the level of described visible light signal changes between high level and low level with different frequencies and/or different phase places and/or different amplitudes.

According to exemplary embodiment of the present invention, described light source 300 is one or more groups light sources, and described imageing sensor 410 obtains image for the described visible light signal launched from one or more groups light source described, and the one or more exposure areas in wherein said image correspond to one or more groups light source described; The image that described memory 420 obtains for storing described imageing sensor; And described processor 430 is for the pattern of the color fringe of one or more exposure area described in measuring in described image, and obtain the information of the described color fringe pattern of one or more exposure area described corresponded in described image.

According to the present invention, before to be also applicable to the embodiment of device 400 about the detailed description of method 200, in order to concise and to the point object, do not repeat them here.Particularly, the step 210 in method 200 can be performed by imageing sensor 410, and the step 220 in method 200 and 230 can be performed by processor 430.

According to exemplary embodiment of the present invention, device 400 can comprise multiple imageing sensor, as shown in figure 19.When using multiple imageing sensor in a device, need to pre-determine to activate which imageing sensor.Alternatively, strategy can be as follows: activate all imageing sensors; Select the imageing sensor of first receiving optical signals as the imageing sensor activated, and close other imageing sensors.Alternatively, but strategy manually selects an imageing sensor to be the imageing sensor activated.Alternatively, strategy can be the information of collecting based on other imageing sensors or processor, selects an imageing sensor to be the imageing sensor activated, to obtain the information corresponding to the pattern of color fringe in exposure area one or more in image.

According to exemplary embodiment of the present invention, software program can be used to trigger for the imageing sensor in the device from visible light signal obtaining information, to start to receive visible light signal.Alternatively, in photographic images process, the realtime graphic obtained from it and information can be presented at this software program, as shown in FIG. 20 A.Alternatively, in photographic images process, the information displaying that can only obtain from image in this software program, as shown in fig. 20b.

According to exemplary embodiment of the present invention, utilize the light source of the visible light signal transmission information of two or more wavelength to comprise according to modulator of the present invention and reflector, light source can comprise in the transmitter, as shown in figure 21.Described reflector also can comprise power supply and microprocessor, such as micro controller unit.Before reflector prepares to launch visible light signal, answer activated in advance imageing sensor.Alternatively, send activation signal by reflector and carry out activation graph image-position sensor, as shown in figure 21.By realizing based on the switch of software activating.When described switch open, imageing sensor starts to receive visible light signal.Alternatively, by alternate manner activation graph image-position sensor.Such as, when software brings into operation, activation graph image-position sensor simultaneously.Alternatively, also activate by other switch, transducer or real-time performance.

According to exemplary embodiment of the present invention, when activation graph image-position sensor is to receive visible light signal, notification transmitter sends visible light signal.This realizes by the hardware based switch installed in reflector, as shown in figure 22.When the switch is opened, reflector starts to send visible light signal; When the switch is closed, reflector stops sending visible light signal.Alternatively, by other method, such as, button, physical contact, transducer and network notify transducer.

According to exemplary embodiment of the present invention, light-sensitive unit can be integrated in the state of detected image transducer among reflector, such as, whether imageing sensor prepares photographic images.Send before visible light signal at reflector, described light-sensitive unit can the state of first check image transducer.Alternatively, when imageing sensor prepares photographic images, the light-emitting component of imageing sensor is with certain frequency shift brightness, and light-sensitive unit integrated in reflector can detect the change of described brightness; Then reflector starts to send visible light signal, as shown in figure 23.Alternatively, by other transducer, the state of the detected image transducers such as such as sound transducer, gravity sensor, accelerometer.Alternatively, by other method, such as network adapter, as GPRS, GSM, CDMA, WiFi, Zigbee, the state of the detected image transducers such as Bluetooth, RFID.

According to exemplary embodiment of the present invention, reflector can transmit polytype information, includes but not limited to, the information such as mark, sound, document, audio frequency, picture, video of reflector, it can store in memory, as shown in figure 24.

According to exemplary embodiment of the present invention, reflector can comprise according to light source of the present invention, microprocessor (such as, microcontroller (MCU)) and battery, as shown in figure 25.Microprocessor is to the drive current/voltage code of light source, and the modulator in light source can based on the drive current/voltage of modulates information light source waiting for transmission, and the reflector in light source can based on modulated drive current/voltage discharge visible light signal.Light source can be two or more light sources of the visible light signal launching two or more wavelength (color).Described battery can be used to provide energy for light source and microprocessor.Alternatively, as shown in figure 25, reflector also can comprise for for battery charging or protection battery are in case surcharge or overheated etc. charging circuit.

According to exemplary embodiment of the present invention, reflector also can comprise transducer, as shown in figure 26.Described transducer can be used for measuring parameters of electric power, as temperature, humidity, voltage and electric current, or biological parameter, as mankind's HR Heart Rate, body temperature and blood pressure.

According to exemplary embodiment of the present invention, reflector also can comprise memory, as shown in figure 27.Described memory is used for storing information, as the information of the data that prestore and sensor collection.

According to exemplary embodiment of the present invention, reflector also can comprise display, as shown in figure 27.Described display is for showing transmitted information.

According to exemplary embodiment of the present invention, the device for obtaining information can comprise imageing sensor, microprocessor (such as MCU) and power supply, as shown in figure 28.Described imageing sensor is used for the visible light signal that photographic light sources is launched.Described microprocessor is for measuring the pattern of the color fringe comprised in captured image and the information for obtaining the pattern corresponding to color fringe.Described power supply is used for providing energy for microprocessor.

According to exemplary embodiment of the present invention, as shown in figure 28, the device for obtaining the information of the visible light signal from two or more wavelength also can comprise communication module.Described communication module can be wired or wireless, and is used in the transfer of data between described device and other electronic equipment, or for attaching the device to internet.

According to exemplary embodiment of the present invention, reflector can be the lamp comprising multiple color light source.Described reflector can be integrated in the embedded system in other devices, as an integration section of ring, as shown in figure 29.

According to exemplary embodiment of the present invention, the system of visible light signal transmission and obtaining information is utilized to comprise according to the device utilizing the light source of the visible light signal transmission information of two or more wavelength and the visible light signal obtaining information from two or more wavelength from light source of the present invention; The basic functional principle of the foundation of this system is as follows: the visible light signal that the imageing sensor photographic light sources in device is launched, and obtain image from it, and the pattern of color fringe in processor measurement image in device, and recover the information of the pattern corresponding to color fringe.

According to exemplary embodiment of the present invention, described reflector accessible site in can among wearable electronic device, provide volume little, be easy to carry and the advantage of low-power consumption.Described can wearable electronic device can be jewelry, as ring, earrings, necklace, wrist-watch etc., or can be key, card, pen etc.When described emitter set be formed in can among wearable electronic device time, describedly wearable electronic device can launch visible light signal for transmission information.

According to exemplary embodiment of the present invention, described reflector accessible site in can among wearable electronic device, as battery-powered ring, as shown in figure 30.It should be pointed out that described ring is only for illustration of the present invention, should not be considered as limitation of the present invention.Described battery is used for providing energy for reflector.The light source that described reflector comprises can launch the visible light signal of two or more wavelength (color), can each light source of separate modulation.

According to exemplary embodiment of the present invention, described reflector can comprise two or more light sources can launching visible light signal, described visible light signal can have two or more wavelength (color), i.e. color 1, color 2 ... with color n, as shown in figure 31.The combination of often kind of color or shades of colour represents unique data code.As above words, described reflector accessible site is in can among wearable electronic device.

According to exemplary embodiment of the present invention, described reflector also can comprise driver, as shown in figure 32.As above words, described reflector accessible site is in can among wearable electronic device.Described driver is used for driving light source.Described driver can provide larger drive current or driving voltage to drive high power light source.By this method, the transmission range improving reflector can be increased.

According to exemplary embodiment of the present invention, described reflector also can comprise battery charger, as shown in figure 33.As above words, described reflector accessible site is in can among wearable electronic device.Described charging circuit not only for being battery charging, and for limiting charging current/voltage or checking temperature etc., to avoid battery surcharge or overheated.Alternatively, charging circuit can by external power source, as power network, solar panel, generator or energy collection system etc.Alternatively, charging circuit can be wireless charging system.

According to exemplary embodiment of the present invention, described reflector also can comprise memory, as shown in figure 34.As mentioned above, described reflector accessible site is in can among wearable electronic device.Described memory is used for storing information, as the data stored in advance, and the information collected by imageing sensor.

According to exemplary embodiment of the present invention, described reflector also can comprise transducer, as shown in figure 35.As mentioned above, described reflector accessible site is in can among wearable electronic device.Described transducer can be used for measurement parameter, as temperature, humidity, voltage and current, or biological parameter, as mankind's HR Heart Rate, body temperature and blood pressure.But described transducer temperature sensor, humidity sensor, optical pickocff, sound transducer, accelerometer, pressure sensor etc.Described reflector also can comprise voltage/current sensing circuit, and described circuit is for detecting the state of battery.When detecting that battery electric quantity is low, described transducer notifies user by light signal, sound and vibration etc.

According to exemplary embodiment of the present invention, described transducer also can comprise network adapter, as shown in figure 36.As mentioned above, described reflector accessible site is in can among wearable electronic device.Described network adapter is used for, at the swapping data having the electronic equipment of network function with other from the equipment of visible light signal obtaining information, as computer, or controlling miscellaneous equipment for sending instruction.Alternatively, described network adapter can use the following communication technology: GPRS, GSM, CDMA, WiFi, Zigbee, Bluetooth, RFID etc.

According to exemplary embodiment of the present invention, before described reflector sends visible light signal, first described reflector can check the state of imageing sensor from the device of visible light signal obtaining information.Alternatively, when described imageing sensor prepares photographic images, the screen of light-emitting component is with certain frequency shift brightness, and the change of brightness as described in detecting by the light-sensitive unit (as transducer) be integrated in reflector; Then described transducer starts to send visible light signal, as shown in figure 37.Alternatively, when the device for signal acquisition information is smart mobile phone, the embedded LED photoflash lamp of smart mobile phone can be used for sending signal to reflector.Alternatively, by other transducer, as sound transducer, gravity sensor and accelerometer etc., detect the state be used for from the device of visible light signal obtaining information.Alternatively, by alternate manner, as network adapter, such as GPRS, GSM, CDMA, WiFi, Zigbee, Bluetooth, RFID etc., detect the state be used for from the device of visible light signal obtaining information.Alternatively, for can be notebook computer or other electronic equipment with light-sensitive element from the device of visible light signal obtaining information.

According to exemplary embodiment of the present invention, described emitter set is formed in can among wearable electronic device.When can wearable electronic device start to send visible light signal, its reflector should be opened.This realizes by the hardware based switch installed in the transmitter or other sensor-based switch be connected with reflector.Wearable electronic device can receive start signal when described, just start to send light signal.Said method is described at Figure 38.

According to exemplary embodiment of the present invention, after described reflector starts to send visible light signal, workflow for the imageing sensor in the device from visible light signal obtaining information is as follows, as shown in figure 39: start reception program, initialisation image transducer, exposure parameter being set, sending the request for receiving visible light signal, and wait for visible light signal; After reception visible light signal, check initial code, analyze captured image, the pattern of color fringe in measurement image, and the information of recovery.

According to exemplary embodiment of the present invention, described reflector provides a kind of navigation system based on visible light signal, as shown in figure 40.Alternatively, for from visible light signal obtaining information and the device comprising imageing sensor can be the mobile device comprising light-sensitive element.Alternatively, but described mobile device smart mobile phone.Modulated light source (e.g., light source) in the transmitter above-mentioned visible light signal can be launched; Launch visible light signal and comprise unique ID corresponding to light source; The image of the imageing sensor photographic light sources in smart mobile phone, measures the pattern of color fringe in these images, decodes to id information, and is compared with the data be stored in map data base by decoded ID.By this method, the accurate location of imageing sensor can be determined from the position of light source.

In a word, exemplary embodiment of the present invention provide a kind of effectively and efficiently for transmitting/scheme of obtaining information, it is transmission/obtaining information more fast and more accurately, and the information transmitting/obtain can comprise more data position.White transition only has the transmission of representative " 1 " or " 0 " or does not transmit two kinds of selections, within the unit interval, only can transmit the data of 1 bit.Compared with white transition, according to exemplary embodiment of the present invention, the light source of multiple color is utilized to launch the visible light signal of two or more wavelength, can at transmission per unit of time more data bit, such as, three kinds of color RGB can transmit the data of 24 bits.Further, utilize the different frequency of visible light signal and/or out of phase and/or different amplitude, can in transmission per unit of time more data.

Should be appreciated that above-described embodiment is exemplary, instead of limitation of the present invention.Those skilled in the art can design alternative embodiment, and does not depart from the protection range of appended claims.Word " comprises " does not get rid of existing element or step, although above-mentioned element or step are not listed in detail in the claims.The existence of multiple described element do not got rid of in word " " before element.In equipment claims, listed some elements, the part of these elements clearly can embody in same hardware product.Word the first, the second, the use of the 3rd does not represent any order, can be title by these word explanations.

Claims

1. utilize the method from the visible light signal transmission information of two or more wavelength of light source, comprising:

Based on information waiting for transmission, modulate two or more drive singal of described light source, to obtain two or more modulated drive signal for driving described light source to launch the visible light signal of two or more wavelength, the level of described modulated drive signal changes between high level and low level with different frequencies and/or different phase places and/or different amplitudes; And

Based on two or more modulated drive signal described, launch the visible light signal of two or more wavelength, to transmit described information, the level of described visible light signal changes between high level and low level with different frequencies and/or different phase places and/or different amplitudes, and described information corresponds to the pattern of the color fringe shown from the image that described visible light signal obtains;

Wherein based on information waiting for transmission, modulate two or more drive singal of described light source, comprise to obtain two or more modulated drive signal:

Based on information waiting for transmission, modulate two or more drive currents of described light source, to obtain first group of modulation drive current, described first group of modulation drive current is greater than unmodulated drive current, makes the luminous flux of the light source driven by described first group of modulation drive current equal the luminous flux of the light source driven by described unmodulated drive current.

2. the method for claim 1, also comprise: based on second group of modulation drive current with high-frequency carrier signal, launch described visible light signal, described second group of modulation drive current is greater than unmodulated drive current, makes the light source that driven by described second group of modulation drive current comprising high level and the luminous flux in low level each cycle is constant.

3. the method as described in any one in claim 1-2, the information of pattern wherein corresponding to color fringe comprises data bit, and described data bit comprises corresponding to the number of described color fringe, color, brightness or the data that put in order.

4. the method as described in any one in claim 1-2, based on information waiting for transmission, modulate two or more drive singal of described light source, comprise to obtain two or more modulated drive signal: the frequency of modulation two or more drive singal described and/or phase place and/or amplitude, to obtain two or more modulated drive signal.

5. utilize the method from the visible light signal obtaining information of two or more wavelength of light source, comprising:

From the described visible light signal acquisition image of two or more wavelength that light source is launched, the level of described visible light signal changes between high level and low level with different frequencies and/or different phase places and/or different amplitudes, comprising: the described visible light signal launched from one or more groups light source described obtains image, and the one or more exposure areas in wherein said image correspond to one or more groups light source described;

Measure the pattern from the color fringe the described image that described visible light signal obtains, comprising: the pattern measuring the color fringe of one or more exposure area described in described image; And

Obtain the information of the pattern corresponding to described color fringe, comprising: the information obtaining the described color fringe pattern of one or more exposure area described corresponded in described image.

6., for utilizing a light source for the visible light signal transmission information of two or more wavelength, comprising:

Modulator, for based on information waiting for transmission, modulate two or more drive singal of described light source, to obtain two or more modulated drive signal for driving described light source to launch the visible light signal of two or more wavelength, the level of described modulated drive signal changes between high level and low level with different frequencies and/or different phase places and/or different amplitudes; And

Reflector, for based on two or more modulated drive signal described, launch the visible light signal of two or more wavelength, to transmit described information, the level of described visible light signal changes between high level and low level with different frequencies and/or different phase places and/or different amplitudes, and described information corresponds to the pattern of the color fringe shown from the image that described visible light signal obtains;

Wherein, modulator, based on information waiting for transmission, modulates two or more drive singal of described light source, comprises to obtain two or more modulated drive signal:

Modulator is based on information waiting for transmission, modulate two or more drive currents of described light source, to obtain first group of modulation drive current, described first group of modulation drive current is greater than unmodulated drive current, makes the luminous flux of the light source driven by described first group of modulation drive current equal the luminous flux of the light source driven by described unmodulated drive current.

7. light source as claimed in claim 6, wherein said modulator is used for: the frequency of modulation two or more drive singal described and/or phase place and/or amplitude, to obtain two or more modulated drive signal.

8., from a device for the visible light signal obtaining information of two or more wavelength from light source, comprising:

Imageing sensor, described visible light signal for two or more wavelength launched from light source obtains image, the level of described visible light signal changes between high level and low level with different frequencies and/or different phase places and/or different amplitudes, comprising: the described visible light signal launched from one or more groups light source described obtains image, and the one or more exposure areas in wherein said image correspond to one or more groups light source described;

Memory, for storing the image that described imageing sensor obtains;

Processor, for measuring the pattern of the color fringe in storage described image in which memory, and obtain the information of the pattern corresponding to described color fringe, comprising: the pattern measuring the color fringe of one or more exposure area described in described image, and the information obtaining the described color fringe pattern of one or more exposure area described corresponded in described image.