CN103327317B - Optical communication transmitting and receiving apparatus and method, and optical communication system and method - Google Patents

Abstract

The present invention provides an optical communication transmission and receiving device and method and an optical communication system and method. According to one embodiment, an optical communication system includes a transmitting device and a receiving device. The transmitting device generates one or more patterns of light to determine at least one reference area, and transmits a signal by emitting light in the at least one reference area determined by the one or more patterns. The receiving device takes a smaller number of measurements than the total amount of a pixel in a sensing image to detect the one or more patterns of light, and determines at least one region of interest based on the one or more detected patterns, and then uses all signals of light in the at least one region of interest to process optical communications, and takes a smaller number of measurements than the total amount of a pixel in at least one tracking area to track the one or more patterns of light emitted by the transmitting device.

Description

Optical communication transmission and reception device and method, and optical communication system and method

technical field

The invention relates to an optical communication transmission and reception device and method, and an optical communication system and method.

Background technique

Optical communication is a wireless communication technology that uses light to communicate, where the light can be sensed by one or more photo diodes, or an image sensor. For example, the light may be, but not limited to, X-rays, ultra-violet light, visible light, or infrared in the frequency range from 10 ⁹ Hz to 10 ¹⁹ Hz. Radio wave (RF) bandwidth is a precious resource. Therefore, optical communication can provide an alternative technology to wireless communication that meets strong demand. For example, visible light emitted from one or more light-emitting diodes (LEDs) is widely used in homes and offices, so it makes visible light emitted from one or more LEDs sufficient for ubiquitous data transmitters . Cameras are already commonly used in cell phones, notebook computers, and many handheld electronic devices. Therefore, the image sensor can be used not only as an incoming image detector, but also as a receiver in a visible light communication (Visible Light Communication, VLC) system. FIG. 1 is a schematic diagram of an example of an optical communication system using an LED array 112 and an image sensor 122 such as a high-speed camera. As shown in FIG. 1 , an encoder 114 in a transmitter 110 can perform physical layer processing, such as error-correction encoding, modulation, OFDM modulation ( OFDM) and so on. A decoder 124 at a receiver 120 may perform inverse signal processing of the encoder 114 . FIG. 2 is a schematic diagram of an example of an optical communication system using a single LED 212 and an image sensor 222 such as a high-speed camera.

An image sensor may consist of an array of photosensites. Charge Coupled Device (CCD) and Complementary Metal-Oxide Semiconductor (CMOS) are two basic types of digital sensors. The photosensitive cells of the first row of a CCD sensor array are read into an output buffer, and then sent to an amplifier (amplifier) and an analog-to-digital converter (ADC). After the first row is read, it is dumped from the read buffer, and the next row of photosensitive cells of the array is read into the buffer. Each photosensitive unit in a CMOS sensor has at least three transistors. These transistors are allowed to do photosensitive processing in the photosensitive unit, and each pixel/photosensitive unit can be accessed individually. In some existing optical communication technologies, only one or a few shared ADCs are used to sense all pixels in an image in either of these two types of image sensors.

FIG. 3 is a schematic diagram of an example of a visible light communication technology. In FIG. 3 , the pixels of the non-interested region in a sensed image (sensed image) are also sampled by the shared ADC in the image sensor in a receiver 320, and are then sampled by a receiver in the receiver 320 (Rx) - baseband processing unit (baseband processing unit) 326 discards. In other words, this technique takes all the captured pixels from the image sensor 322 and uses a luminance change detection to detect the Region Of Interest (ROI). Taking all the pixels in an image may limit frame rates up to a few hundred frames per second. However, the typical data rate requirement for wireless communication is 10M to 1G bits per second.

FIG. 4 is another schematic diagram of a visible light communication technology. In the VLC system shown in FIG. 4 , a transmitter 400 has a modulation circuit 410 and a light-emitting drive circuit 420 . The modulation circuit 410 generates a different modulation signal 412 . The light emission driving circuit 420 drives a light emitting element 422 according to the modulation signal 412 output from the modulation circuit 410 as a driving signal 421 . When the driving signal 421 is kept at a high level, the light emitting driving circuit 420 makes the light emitting element 422 emit visible light 440 superimposed on the signal 402 . When the driving signal 421 is kept at a low level, the light emission driving circuit 420 makes the light emitting element 422 not emit light.

Optical communication remains a potential solution to the global wireless spectrum shortage. Various solutions for visible light communication technology have been proposed. Typically, light-emitting elements such as LEDs, and image sensors such as cameras, are existing components of VLC solutions. However, the frequency response of the LED has a low bandwidth, and the image sensor has a low frame rate due to the shared ADC. Therefore, there are still many challenges for the solution of high data transmission rate of visible light communication.

Contents of the invention

Embodiments of the present invention provide an optical communication transmission and reception device and method, and an optical communication system and method.

An embodiment of the present invention relates to a transmission device for optical communication. The transmission device may include a pattern generating unit configured to generate one or more patterns to determine at least one or more reference areas; an optical communication ( LC) control unit connected to a transmitter-baseband processing unit, and the LC control unit selects its input from the transmitter-baseband processing unit or from the pattern generation unit; and a light emitting element from which one or more pattern Or emit light in the one or more reference areas determined by the one or more patterns.

Another embodiment of the present invention relates to a transmission method of optical communication. The transmission method may include: determining one or more reference regions by transmitting one or more patterns during at least one cycle by using a light emitting element and using the light emitting element to transmit data by emitting light in one or more reference areas determined by the one or more patterns.

Another embodiment of the present invention relates to a receiving device for optical communication. The receiving device may include a region of interest (ROI) determining unit, an image sensing element, and an image processing unit. The ROI determining unit is configured to detect one or more patterns of light in a sensing image, and determine the at least one ROI according to at least one detected pattern. The image sensing element is configured to generate the sensing image, and sense light according to an output generated by the ROI determining unit. The image processing unit performs image processing in the at least one ROI according to the output of the image sensing element.

Yet another embodiment of the present invention relates to a receiving method for optical communication, the receiving method may include: in an acquisition mode (acquisition mode), using a total amount of pixels compared to a sensing image of an image sensing element a lesser amount of a first plurality of measurements to detect the received one or more patterns, and determine at least one ROI according to the one or more detected patterns; and in a data receiving mode (data receiving mode ), use all the pixel data of the light in the at least one ROI to process the light communication.

Another embodiment of the present invention relates to an optical communication system. The optical communication system includes a transmitting device and a receiving device. The transmission device is configured to generate one or more patterns to determine at least one reference area, and to transmit data by emitting light in the one or more reference areas determined by the one or more patterns. The receiving device is configured to detect the one or more patterns, and determine at least one ROI based on the one or more detected one or more patterns, and then use all signals of light in the at least one ROI for processing Optical Communication.

Another embodiment of the present invention relates to an optical communication method. The method may include: in a transmitting device, generating one or more patterns of light to determine at least one reference area, and transmitting data by emitting light in the one or more reference areas determined from the one or more patterns; and In a receiving device, the one or more patterns of light are detected using a first plurality of measurements less than the total number of pixels of a sensed image, and based on the one or more detected patterns to determine at least one ROI, and then use all pixel data of light in the at least one ROI to process light communication.

The above and other advantages of the present invention will be described in detail below in conjunction with the following drawings, detailed description of the embodiments and claims.

Description of drawings

FIG. 1 is an exemplary schematic diagram of an optical communication system using an LED array and an image sensor.

FIG. 2 is an exemplary schematic diagram of an optical communication system using a single LED and an image sensor.

FIG. 3 is a schematic diagram of an example of a visible light communication technology.

FIG. 4 is an example schematic diagram of another visible light communication technology.

FIG. 5 illustrates an optical communication system according to an embodiment of the present invention.

FIG. 6A illustrates an optical communication transmission method according to an embodiment of the present invention.

FIG. 6B is a schematic diagram illustrating an example of a transmitted pattern determining a reference area according to an embodiment of the present invention.

Fig. 7A illustrates an example of three different patterns emitted by a 16x16 LED array at three different times, according to an embodiment of the present invention.

FIG. 7B illustrates a reference area represented by a plurality of dot-shaped LEDs according to an embodiment of the present invention.

FIG. 7C illustrates three other patterns emitted by an LED array, according to an embodiment of the present invention.

FIG. 8 illustrates an example pattern emitted by a single LED transmitter at five different times, according to an embodiment of the present invention.

FIG. 9 illustrates another example of transmission patterns of multiple light sources according to an embodiment of the present invention.

FIG. 10 illustrates the operation of an optical communication receiving method according to an embodiment of the present invention.

11A to 11F illustrate the operation flow of an optical communication system according to an embodiment of the present invention.

FIG. 12 illustrates an optical communication method according to an embodiment of the present invention.

FIG. 13 illustrates a method for detecting a pattern in acquisition mode or tracking mode according to an embodiment of the present invention.

[Description of main component symbols]

110 transmitters 112 LED arrays

114 encoder 120 receiver

122 image sensors 124 decoders

212 single LED 222 image sensor

320 receiver 322 image sensor

326 Receiver - Baseband Processing Unit

400 transmitter 410 modulation circuit

412 modulation signal 421 drive signal

420 light emitting driving circuit 422 light emitting element

440 visible light

500 optical communication system 510 transmission device

512 pattern generation unit 512a one or more patterns

514 transmitter - baseband processing unit 516 optical communication control unit

516a one or more signal 520 receiving means

517 driver unit 518 light emitting element

555 channels 522 image sensing elements

524 area of interest determination unit 524a at least one area of interest

526 image processing unit 528 receiver - baseband processing unit

610 Send one or more patterns, and form one or more shapes of patterns to determine one or more reference regions

615 emit light in one or more reference areas determined by the one or more patterns to transmit data

620 transmitted pattern 625 reference area

T1, T2, T3 time

a, b, c, d light source

1101, 1102, 1103 image 1130 reference area

1140 Interest Area 1160 Tracking Area

1210 generate one or more patterns of light, and this pattern can form one or more reference areas determined by the shape of one or more

1220 emit light in one or more reference areas determined by one or more patterns through a light emitting element

1230

get mode

Detecting one or more patterns of light taking fewer measurements than a total number of pixels of a sensed image, and determining at least one region of interest based on the one or more detected patterns

1240

data receiving mode

Taking all the optical signals of the at least one region of interest for subsequent processing of optical communication

1250

tracking mode

taking fewer measurements than a total number of pixels in a tracking area to track the one or more patterns of light emitted by the light emitting element

1310 Quantize all straight lines of the sensed image into a parameter space

1315 derives an inverse transformation

1320 taking a lesser number of random measurements than a total amount from a random combination of pixels from the sensed image or from at least one tracking region

1325 apply a modified orthogonal matching pursuit on the small number of random measurements to obtain the parameters of the pattern in the parameter space

1330 repeats steps 1320 and 1325 until a final frame of the pattern is reached

detailed description

Embodiments of the present invention provide an optical communication technology that increases a data transmission rate (data rate). This technique detects optical regions of interest (ROIs) and drastically reduces the sampling rate of one or more shared ADCs in the image sensor. Once the receiver determines the ROI, the ADC can only be used for pixels in the region of interest. Compared with the existing optical communication technology, the embodiment of the present invention can greatly increase the frame rate, and can also greatly reduce the acquisition time for performing optical communication. To accomplish this feature, a transmitter can emit light in one or more patterns, and the one or more patterns can form one or more shapes to determine the reference area. The emitted light can be, but is not limited to, X-rays, ultraviolet light, visible light, or infrared light in the frequency range from 10 ⁹ Hz to 10 ¹⁹ Hz. The transmitter can then transmit a signal by emitting light in the reference area determined by the one or more patterns. In a receiver, fewer measurements than the total number of a pixel of a sensory image may be taken to detect one or more patterns of light emitted by the transmitter. Measurements may include random combinations of pixels in this sensed image. Once the receiver determines the ROI of the sensing image based on the detected one or more patterns, the receiver can use all the signals in the ROI for optical communication processing.

FIG. 5 is an optical communication system according to an embodiment of the present invention. As shown in FIG. 5 , the optical communication system 500 may include a transmitting device 510 and a receiving device 520 . In the transmission device 510, a pattern generation unit 512 can be configured to generate one or more patterns 512a, and the patterns 512a can form one or more shapes to determine one or more reference regions; a light emitting element 518 can be in one or more emit light in one or more reference regions determined by the plurality of patterns 512 a ; and an optical communication (LC) control unit 516 connected to a transmitter-baseband processing unit 514 . The light emitting element can be, but not limited to, a single LED or an LED array. The LC control unit 516 can select its input from the transmitter-baseband processing unit 514 or from the pattern generation unit 512 . The transmitter-baseband processing unit 514 connected to the optical communication (LC) control unit 516 can perform a plurality of baseband operations for wireless communication, such as error correction coding, interleaving, modulation, IFFT, etc. The input of the LC control unit 516 is selected from the transmitter-baseband processing unit 514 when the transmitting device 510 is in a data transmission period. The input of the LC control unit 516 is selected from the pattern generating unit 512 when the transmitting device is in a reference region indication period. A driver unit 517, such as an LED driver, may apply each of the one or more signals 516a generated by the LC control unit 516 as an AC current or voltage to a direct current (DC) bias of the light emitting element 518, And the light emitting element 518 can be driven to emit light in one or more reference regions determined by one or more patterns 512a.

The light emitted in the one or more reference regions is transmitted to the receiving device 520 through a channel 555 . In the receiving device 520, an image sensing element 522, such as an image sensor, is configured to sense light based on the output generated by a region of interest (ROI) determination unit 524; this ROI determination unit 524 is configured to detect one or more patterns of light emitted by the device 510, and determine at least one ROI 524a of a sensed image from the image sensing element 522 based on the one or more detected patterns; and an image processing unit 525 based on the ROI The output of the image sensing element 522 in 524a is used to perform optical communication processing. This output can be, for example, RGB to YUV (or YCbCr), color adjusted, filtered, etc. The ROI determination unit may take fewer measurements than the total number of one pixel of the sensed image to detect the received light pattern. Measurements may include sensing random combinations of pixels in an image. The image processing unit 525 may also take a smaller number of measurements than a total of one pixel of at least one tracking area to track the pattern of light emitted by the delivery device.

The receiving device 520 may further include a receiver-baseband processing unit 528 connected to the image processing unit 526 to perform baseband processing, such as FFT, demodulation, de-interleaving, error correction, etc., to recover the received data.

Accordingly, an optical communication method operates as follows. In a transmission device, the optical communication method can generate one or more patterns of light, and the patterns can form one or more shapes to determine at least one reference area; and in the at least one reference area determined by the one or more patterns emit light to transmit data. Also, in a receiving device, the optical communication method may take fewer measurements than the total number of pixels of a sensed image to detect one or more patterns of light, and based on one or more detected One or more patterns are used to determine at least one ROI of the sensing image, and then all optical signals in the at least one ROI are used to process optical communication. In the receiving device, the optical communication method may also take fewer measurements than a total of one pixel in at least one tracking area to track one or more patterns of light emitted by the transmitting device. The measurement may include a random combination of pixels in the at least one tracking area.

It can be seen from the figure that because of one or more patterns of light emitted by the transmitting device 510, two quantities in the pattern detection of the receiving device 520 can be greatly reduced, such as the shared ADC sampling amount and computational complexity . This significantly reduces the time taken. After the receiving device 520 determines the ROI, the ADC(s) may only be used for pixels in the ROI. Therefore, when optical communication is performed, the picture rate is thus greatly increased.

FIG. 6A illustrates a transmission method of optical communication according to an embodiment of the present invention. In FIG. 6A, the transmission method first transmits one or more patterns 512a, and one or more shapes of the patterns can be formed during at least one cycle to determine one or more reference regions (step 610). For use in optical communication, the transmission method may transmit data by using a light-emitting element to emit light in one or more reference regions determined by the one or more patterns (step 615). FIG. 6B is a schematic diagram illustrating an example of a reference area 625 determined by a transmitted pattern 620 according to an embodiment of the present invention. The one or more reference areas determined by the one or more patterns can identify the position of the transmission device, such as in the case of multiple light sources, or be used in optical communication to transmit signals. The transmission method may also include using an optical communication control unit to select one or more patterns as its input, or select its input from a transmitter-baseband processing unit, the transmitter-baseband processing unit Perform multiple baseband operations for wireless communications.

The transmitted pattern or patterns may form a time-invariant sequence. Fig. 7A illustrates an example of three different patterns emitted by a 16x16 LED array at three different times, according to an embodiment of the present invention. In FIG. 7A , small squares with slashes represent turned on LEDs, and blank squares represent turned off LEDs. Three arrows indicate three different times, namely time T1, time T2, and time T3. Therefore, the turned-on LEDs can form a sequence of patterns that vary with time, and each pattern can be included in the boundary or center of the LED array, and a reference area can be determined. To reduce detection complexity and time at the receiver, a transmitted pattern may only include two lines. FIG. 7B illustrates a reference area represented by a plurality of dot-shaped LEDs according to an embodiment of the present invention. Data in the reference area can be transmitted by the LEDs via on-off keying of modulation. FIG. 7C illustrates three other patterns emitted by an LED array, according to an embodiment of the present invention.

FIG. 8 illustrates an example pattern emitted by a single LED transmitter at five different times, according to an embodiment of the present invention. In FIG. 8, a gray bubble indicates that the single LED is turned off, and a white bubble indicates that the single LED is turned on. This pattern is formed by periodically turning this single LED on and off. The five arrows represent the first period to the fifth period respectively. The reference area is equivalent to the illuminated area of this single LED. After the pattern is formed, the single LED can start to transmit data by turning on-off or adjusting the voltage or current level of the single LED.

FIG. 9 illustrates another example of transmission patterns of multiple light sources according to an embodiment of the present invention. As shown in FIG. 9, there are four light sources, denoted by light source a to light source d, and only light source a is used as a transmitter for optical communication. Therefore, only the light source a emits a predetermined and time-varying pattern to identify its position. In other words, the reference area determined by the predetermined and time-varying pattern can be used to identify the location of the light source emitting the predetermined and time-varying pattern.

FIG. 10 illustrates the operation of an optical communication receiving method according to an embodiment of the present invention. The receiving method may include three modes of operation, namely, an acquisition mode, a data receiving mode, and a tracking mode. In the acquisition mode, the receiving method starts from an image sensor A small number of measurements are taken by multiple pixels in the sensed image to detect one or more transmitted patterns. The measurements may include random combinations of pixels in the sensed image. Measurements taken in acquisition mode The number is less than the total number of pixels in the sensed image, for example, an image sensing array (imagesensing array) in an image sensor. The receiving method then compares the detected pattern with one or more pattern, such pattern can be stored in a memory device (memory means). If a successful matching result is obtained from the comparison, the receiving method determines a region of interest (ROI) according to the detected pattern. If not obtained from Obtaining such a successful matching result in the comparison, the receiving method continues to perform the above-mentioned operation of pattern detection in the acquisition mode.

After determining the ROI, the receive method can enter a data receive mode. In data receiving mode, the receiving method uses all pixel data in the ROI for optical communication processing, such as image processing and receiver (Rx)-baseband processing. This pixel data can be taken from a sensed image, or from an optical signal. After the processing of the optical communication of the ROI is completed, the receiving method can enter the tracking mode. In tracking mode, the receiving method takes fewer measurements than a total of one pixel of at least one tracking area to track a transmitter transmitting one or more patterns, such as the position of the transmitter. According to a pattern detection result in the tracking mode, the ROI can be refined. When the ROI improvement is complete, the receive method returns to data receive mode to receive data. This data receiving mode and tracking mode processing may continue iteratively until optical communication is complete.

11A to FIG. 11F illustrate the operation flow of an optical communication system according to an embodiment of the present invention. The optical communication system is provided with a light emitting element realized by an LED array. In FIG. 11A, at three different times, an image sensing array in the image sensor senses three images 1101 to 1103, where the small gray squares in each image are received in the receiving device in acquisition mode Measurements taken by an ADC of , where the measurements are RGB values of pixels, and the bold lines in each image are patterns transmitted by the transmitting device. After image processing is performed on the measurements taken by this ADC for each image, such as converting the RGB values of these pixels into luminance representing the pixel value, applying Orthogonal Matching Pursuit (OMP) to a valid value representing the pixel value Determining the intensity and a product matrix, the parameters of the lines forming the pattern on each image can be detected, as shown in FIG. 11B. In FIG. 11C , a reference area 1130 is determined according to the detected patterns of the three images, as shown by the dotted line. The reference area may be, but not limited to, a maximum area enclosed by the detected lines in FIG. 11B . The ADC of this receiving device takes each sample of the ROI 1140 containing the reference region 1130 and is represented by a square filled with vertical lines, as shown in FIG. 11D , for subsequent processing of the optical communication. In various implementations, the size of this ROI 1140 can be larger, smaller, or equal to the reference region 1130 . Moreover, an ROI can include an area, or a collection of multiple smaller areas, as shown in FIG. 11E . In FIG. 11F , the horizontal line represents a tracking area 1160 in which the receiving device can track the position of the transmitting device using a smaller number of measurements than the total number of one pixel of the tracking area 1160 .

FIG. 12 illustrates an optical communication method according to an embodiment of the present invention. As shown in Figure 12, this optical communication method can generate one or more patterns of light, and this pattern can form one or more shapes to determine one or more reference areas (step 1210), and can pass through a light-emitting element Light is emitted in one or more reference regions determined by the one or more patterns (step 1220). In an acquisition mode 1230, the optical communication method may take fewer measurements (a first plurality of measurements) than the total number of pixels of a sensed image to detect one or more light patterns, and based on a or multiple detected patterns to determine at least one ROI. In a data receiving mode 1240, the optical communication method can adopt all optical signals of the at least one ROI to perform subsequent processing of optical communication. The optical communication method can also enter a tracking mode. In the tracking mode 1250, the optical communication method may take fewer measurements (a second plurality of measurements) than the total number of pixels in a tracking area to track the one or more measurements of the light emitted by the light-emitting element. pattern. The one or more patterns for generating light and the details of the one or more patterns have been described in earlier embodiments and are omitted here.

Compressive sensing and generalized Hough transform (GHT) or Radon transform techniques can be applied to the transmitted patterns from under-determinant stochastic measurements. The detailed procedure is explained below. Let P={π ₁ , π ₂ ,..., π _N } be a set of possible parameters in the parameter space, where the parameter space can be a straight line, a circle, or a combination of geometric figures of any shape or is the set of any combination. Let a parameter vector p be an indicator function, ie if the image contains the parameter π _k , then the kth element of p is non-zero. For example, the three sensing images in FIG. 7A correspond to the three pointer functions P1, p2 and p3 respectively. Each graph in Figure 7A contains two lines, so each pointer function contains only two non-zero elements. In other words, M straight lines in the two-dimensional image space are equal to M points in the parameter space after GHT. For an image f, the relationship between f and p can be written as f=Hp, where H is an inverse operator of GHT or an inverse operator of random transform. Since the pointer function p is sparse, the theory of compressed sensing can be applied. Therefore, the receiving device in the embodiment of the present invention can detect the pattern transmitted by the pointer function p by taking a deterministic random measurement instead of sampling an entire image. Let y be a number of random measurements, and the size of y is much smaller than the size of the entire image. A relation y=Ψf=ΨHp holds, where Ψ is a set of randomly measured basis vectors. The pointer function p can be passed through an estimator satisfying the condition of y=ΨHp to be restored. Therefore, it is better that the number of straight lines included in a transformed pattern be as small as possible.

FIG. 13 illustrates a method for detecting a pattern in acquisition mode or tracking mode according to an embodiment of the present invention. As shown in FIG. 13 , the method first quantizes all straight lines of the sensed image into a parameter space (step 1310 ), and derives an inverse transformation (step 1315 ), such as a Hough transformation or a random transformation. An example of the application of a matrix to generate the inverse Hough transform can first be by taking an angle θ in the range of 0° to 180°, and a radius r in the range of -25 to 25, for example, Δθ equals 2° and Δr equals 3, and then The size (size) of the parameter space in the (r, θ) coordinate system is obtained, where this size can be calculated as (180/Δθ)×(50/Δr), which is equal to 1530. The method then takes a smaller number of random measurements (first measurement or second measurement) than a total amount from a random combination of pixels from the sensed image (a first measurement) or from at least one tracking region (a second measurement). measurements) (step 1320), and apply a modified OMP on the small number of random measurements to obtain the parameters of the pattern in the parameter space (step 1325). The number of this small number of measurements that the pattern needs to take can be calculated as C x k x log(N/k), where C is a constant, k is the number of lines in the pattern, and N is the number of pixels in the sensed image . The method repeats steps 1320 and 1325 until a final frame of the pattern is reached (step 1330).

In summary, the foregoing embodiments of the present invention provide an optical communication transmission and reception device and method, and an optical communication system and method. The optical communication system includes a transmitting device and a receiving device. The transmitting device generates one or more patterns of light, and the patterns can form one or more shapes to determine one or more reference areas; and emit light from the one or more reference areas determined by the one or more patterns light to transmit the signal. In an acquisition mode, the receiving device detects one or more patterns of light by taking a smaller number (a first number) of measurements than a total number of pixels of a sensed image, and based on one or more detected The detected pattern is used to determine at least one ROI of a sensing image. In a data receiving mode, the receiving device adopts all signals in the at least one ROI to process optical communication. In a tracking mode, the receiving device takes a smaller number (a second number) of measurements than a total number of pixels of at least one tracking area to detect one or more patterns of light emitted by the transmitting device. Compared with the existing optical communication technology, when the optical communication is performed, the embodiment of the present invention can greatly increase the frame rate and greatly reduce the occupation time.

The above descriptions are only examples of the present invention, and should not limit the implementation scope of the present invention accordingly. That is, all equivalent changes and modifications made by the claims of the present invention shall still fall within the scope covered by the patent of the present invention.

Claims (29)

1. A transmission device for optical communication, comprising: a pattern generation unit configured to generate a plurality of patterns to determine at least one or more reference regions, wherein the plurality of patterns form a time-varying sequence; an optical communication LC control unit connected to a transmitter-baseband processing unit, and the LC control unit selects its input from the transmitter-baseband processing unit or from the pattern generation unit; and A light emitting element transmits data from all light emitted from the plurality of patterns or the one or more reference areas determined by the plurality of patterns. 2. The device of claim 1, wherein the one or more reference areas determined by the plurality of patterns identify one or more locations of the conveying device. 3. The device according to claim 1, wherein the one or more reference areas determined by the patterns are used to transmit signals of optical communication. 4. The device according to claim 1, wherein when the transmitting device is during a data transmission, the LC control unit selects one of the transmitter-baseband processing units performing a plurality of baseband operations for wireless communication enter. 5. The device of claim 1, wherein the LC control unit selects its input from the pattern generating unit when the transmitting device is during a reference area indication. 6. The device according to claim 1, further comprising a driving unit to drive the light emitting element to emit light. 7. A transmission method for optical communication, the method comprising: determining one or more reference regions by transmitting a plurality of patterns during at least one cycle using a light-emitting element, wherein the plurality of patterns form a time-varying sequence; and Using the light emitting element, data is transmitted by all light emitted from the one or more reference areas determined by the plurality of patterns. 8. The method of claim 7, further comprising: An optical communication control unit is used to select the plurality of patterns as its input, or select its input from a transmitter-baseband processing unit performing multiple baseband operations of the wireless communication. 9. The method of claim 7, wherein the light in the one or more reference regions is emitted by an LED array via an on-off keying modulation scheme, one of a plurality of modulation schemes . 10. The method of claim 7, wherein the plurality of patterns are formed by periodically turning on and off a single LED. 11. A receiving device for optical communication, comprising: A region of interest ROI determining unit configured to detect a plurality of patterns of light in a sensed image, and determine at least one ROI according to at least one detected pattern, wherein the plurality of patterns form a time-varying the sequence of; an image sensing element configured to generate the sensed image and sense light according to an output generated by the ROI determining unit, wherein the image sensing element processes light communication using all pixel data of light in the ROI, said all pixel data is used to transfer data; and An image processing unit, in the at least one ROI, performs image processing according to the output of the image sensing element; wherein the ROI determination unit detects the patterns using a first plurality of measurements less than a total number of pixels in the sensed image, the first plurality of measurements comprising pixels in the sensed image Various random combinations. 12. The device according to claim 11, wherein the receiving device further comprises a receiver-baseband processing unit, the receiver-baseband processing unit is connected to the image processing unit, and performs an operation for restoring the received data A fundamental frequency processing. 13. The apparatus of claim 11, wherein each ROI of the at least one ROI comprises a region or a union of a plurality of smaller regions. 14. The apparatus of claim 11, wherein the image processing unit further tracks the plurality of patterns of received light with a second plurality of measurements that is less than a total number of pixels of at least one tracking region. 15. The apparatus of claim 14, wherein the second plurality of measurements comprises random combinations of pixels in the at least one tracking region. 16. A receiving method for optical communication, comprising: In an acquisition mode, the received patterns are detected using a first plurality of measurements less than the total number of pixels of a sensed image of an image sensing element, and based on the plurality of detected Determine at least one region of interest (ROI) based on the obtained patterns, wherein the plurality of patterns form a time-varying sequence; and In a data receiving mode, processing light communication using all pixel data of light in the at least one ROI, said all pixel data being used to transmit data; Wherein the first plurality of measurements includes random combinations of pixels in the sensed image. 17. The method of claim 16, further comprising: In a tracking mode, at least one position of a transport device is tracked using a second plurality of measurements less than a total number of pixels of at least one tracking area. 18. The method of claim 17, wherein the method uses a scheme to detect any one of a plurality of patterns in the acquisition mode or the tracking mode, and the scheme comprises: quantizing all lines in the sensed image into a parameter space, and deriving an inverse transformation; taking the first or the second plurality of measurements and applying a modified orthogonal matching pursuit to obtain one or more parameters of the pattern in the parameter space, and repeating this step until a final frame of the pattern is achieved . 19. The method according to claim 16, wherein in multiple implementations, each ROI of the at least one ROI is greater than, or smaller than, or equal to each of the at least one reference region determined by the plurality of patterns reference area. 20. The method of claim 16, wherein each ROI of the at least one ROI comprises a region or a union of a plurality of smaller regions. 21. The method of claim 17, wherein the second plurality of measurements comprises random combinations of pixels in the at least one tracking region. 22. An optical communication system comprising: A transmission device configured to generate a plurality of patterns during at least one period to determine at least one reference area, and transmit data by emitting light from one or more reference areas determined by the plurality of patterns, wherein the the plurality of patterns forming a time-varying sequence; and A receiving device configured to detect the plurality of patterns, and determine at least one region of interest ROI according to the plurality of detected patterns, and then use all signals of light in the at least one ROI to process optical communication, so All pixel data described above is used to transmit data. 23. The system of claim 22, wherein each ROI of the at least one ROI comprises a region or a union of a plurality of smaller regions. 24. The system of claim 22, wherein the receiving device further tracks the patterns of light emitted by the transmitting device using a smaller number of measurements than a total number of pixels of at least one tracking area. 25. The system of claim 24, wherein the plurality of measurements comprise random combinations of pixels in the at least one tracking region. 26. A method of optical communication, comprising: In a transmission device, a plurality of patterns of light are generated during at least one cycle to determine at least one reference area, and data is transmitted by emitting light from the at least one reference area determined by the plurality of patterns, wherein said the plurality of patterns forming a time-varying sequence; and In a receiving device, detecting the patterns using a first plurality of measurements less than a total number of pixels of a sensed image, and determining at least one interest based on the detected patterns Region ROI, then use all signals of the light in the at least one ROI to process optical communication, said all pixel data is used to transmit data. 27. The method of claim 26, wherein the method further comprises: The at least one reference area determined using the plurality of patterns identifies one or more locations of the conveying device. 28. The method of claim 26, wherein the method further comprises: In the receiving device, the patterns of light emitted by the transmitting device are tracked using a second plurality of measurements less than a total number of pixels of at least one tracking area. 29. The method of claim 28, wherein the first plurality of measurements includes a plurality of random combinations of pixels of the sensed image, and the second plurality of measurements includes a plurality of random combinations of pixels in the at least one tracking region. random combination.