CN103048765A - Camera focusing device and method - Google Patents
Camera focusing device and method Download PDFInfo
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- CN103048765A CN103048765A CN2012105571819A CN201210557181A CN103048765A CN 103048765 A CN103048765 A CN 103048765A CN 2012105571819 A CN2012105571819 A CN 2012105571819A CN 201210557181 A CN201210557181 A CN 201210557181A CN 103048765 A CN103048765 A CN 103048765A
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Abstract
The invention discloses a camera focusing device, which comprises a ranging sensor, a control module and a focusing module. The invention further discloses a camera focusing method. The method comprises the following steps that (1) the ranging sensor measures a distance from a tested object to the ranging sensor, and transmits the measured distance information to the control module; (2) the control module receives the distance information transmitted by using the ranging sensor, judges according to the distance information, and transmits a control signal to the focusing module; and (3) the focusing module focuses according to the control signal transmitted by using the control module. According to the camera focusing device and the camera focusing method, the focusing times are not required to be controlled through a focusing key, and the zooming magnitude is determined according to the distance of the tested object for adjusting a focal length, sensed by the range sensor, so that the defects of slow response, poor sensitivity and low accuracy of the focusing key used in the prior art are overcome, and camera focusing can be realized flexibly and rapidly.
Description
Technical field
The present invention relates to digital camera field, especially a kind of camera focusing method and device.
Background technology
Along with improving constantly of people's living standard, the domestic electric appliances such as computer, televisor, video camera, camera are more and more universal in people's daily life, digital camera has been widely used in the average family, when people's party, celebrating date celebration and out on tours, people always like shooting with video-corder required scene with digital camera, fine moment preserved as commemorating and being shown to relatives and friends see, stay at one's side the good days memory, digital camera has become people's indispensable ingredient of living.Simultaneously, mobile phone is as one of of paramount importance communication tool in people's daily life, and usually also integrated digital camera is integrated, and obtains more and more widely applicating and exploitation in the digital filming field.
Digital camera of the prior art comprises the module of finding a view, image-forming module, memory module, control module, output module and power module; The module of wherein finding a view comprises camera lens and view finder, and view finder comprises again optical finder and electronic viewfinder and display module thereof, and this display module is generally LCDs (LCD); Image-forming module comprises image sensor, A/D converter (A/D converter) and digital signal processor (DSP), and described image sensor generally includes Charge Coupled Device (CCD) CCD image sensor (Charge Coupled Device) or complementary matal-oxide semiconductor CMOS(Complementary Metal-Oxide Semiconductor); Memory module comprises buffer memory and packaged type medium; All the other control module controls that all formed by electronic circuit the optical lens system in the digital camera in camera lens; Power module provides power supply for digital camera.Light converges through camera lens and is imaged on the image sensor, converts light signal to electric signal by image sensor, and electric signal is converted into digital signal through A/D, stores after DSP processes again.
In order to shoot the picture of different distance, common digital camera can possess zoom function.Zoom is divided into again optical zoom (Optical Zoom) and Digital Zoom.Wherein, optical zoom refers to that digital camera relies on the optical lens structure to realize zoom.The optical zoom mode of digital camera and traditional 35mm camera-type seemingly move to amplify and dwindle the scenery that needs shooting by eyeglass exactly, and the optical zoom multiple is larger, and the scenery that can take is just far away.Optical zoom is that the position by camera lens, object and focus three parts changes and produces, and when imaging surface moved in the horizontal direction, vision and focal length will change, and farther scenery becomes more clear.Application number is that 201010004689.7 application for a patent for invention discloses a kind of optical zoom module, and it comprises an OPTICAL SENSORS, a wafer scale optical lens module and a focusing motor; The wafer scale optical lens module is positioned on the OPTICAL SENSORS; The wafer scale optical lens module comprises at least one transparent substrates and at least one lens, and wherein lens configuration is on transparent substrates; Focusing motor is between wafer scale optical lens module and OPTICAL SENSORS, and mobile wafer scale optical lens module, make the wafer scale optical lens module away from or near OPTICAL SENSORS.
Digital Zoom is that the Digital Zoom control module is set in control module, and the control figure signal processor carries out independent amplification with the image information that the photosensitive unit in a certain zone in the image sensor obtains.But, this simple amplification in fact with imgae processing software in to amplify be duplicate in the part, not too not large use is worth.Now, image calculation software has been contained in the digital camera inside of many manufacturers, it can be in zooming, in the time of loss of detail, the pixel characteristics of each pixel periphery are analyzed, and increase pixel with the data of analyzing gained at this pixel periphery, and in fact be exactly so-called " interpolation " imaging, this can alleviate the local image that amplifies image quality to a certain extent.
When the control digital camera is focused, usually the method that uses has two kinds, a kind of is to use special zoom button to focus, comprise physical button and virtual key, wherein physical button be arranged on the digital camera casing by by or the button that triggers of the mode dialled, virtual key touches screen display and can be according to touching the button that triggers for being implemented in by program.The zoom button links to each other with control module, and the signal of will focusing is sent to control module, and control module is controlled digital camera again and carried out optical zoom or Digital Zoom; Another kind is to use capacitance touch screen, utilizes the multi-point touch function, realizes zoom by the operating gesture of touch screen.
Carry out zoom although aforesaid way can be controlled camera, also have following shortcoming:
For first kind of way, the physical button reaction is slow, poor sensitivity; Virtual key relies on degree of accuracy and the sensitivity of touch-screen, and the degree of accuracy of different touch-screens and sensitivity are uneven, affect reaction velocity and the degree of accuracy of zoom;
For the second way, multi-point touch only has capacitive touch screens to realize, the resistance-type touch screen do not support, and the degree of accuracy of capacitance plate and sensitivity are uneven, also can affect reaction velocity and the degree of accuracy of zoom.
Summary of the invention
The objective of the invention is to overcome defective of the prior art, a kind of Focalizing arrangement for camera and method are provided, not only have and be quick on the draw, the advantage that degree of accuracy is high provides new focusing mode to bring brand-new technology to experience to the user simultaneously.
For addressing the above problem, a kind of Focalizing arrangement for camera of the present invention comprises:
Distance measuring sensor links to each other with control module, is used for detecting when focusing the distance with measured object, and the range information that records is sent to control module;
Control module links to each other with zoom modules, is used for receiving the range information that distance measuring sensor sends, and the default distance and zoom multiple corresponding relation of contrast, determines corresponding zoom multiple, and the zoom multiple transmits control signal to zoom modules according to this;
Zoom modules is used for carrying out zoom according to the control signal that control module is sent.
Described zoom modules comprises optical zoom module or Digital Zoom module.
Described Digital Zoom module comprises digital signal processor, image sensor and A/D converter, and wherein A/D converter links to each other with image sensor with digital signal processor respectively.
Described distance measuring sensor is infrared distance sensor.
Described Focalizing arrangement for camera also comprises load module, and this load module links to each other with control system, is used for the signal that input starts automatic focusing, and input selection uses the signal of optical zoom or Digital Zoom.
Described load module is physical button or virtual key.
A kind of camera focusing method may further comprise the steps:
1) distance measuring sensor is measured the distance with measured object, and the range information that records is sent to control module;
2) control module receives the range information that distance measuring sensor sends, and the default distance and zoom multiple corresponding relation of contrast, determine corresponding zoom multiple, and the zoom multiple transmits control signal to zoom modules according to this;
3) zoom modules carries out zoom according to the control signal that control module is sent.
Also comprise the step that starts automatic focusing before the described step 1, send enabling signal by load module to control module, and then control module control distance measuring sensor is opened.
The step that also comprises choice for use optical zoom or Digital Zoom after the step of described startup automatic focusing is finished, send the signal of selecting optical zoom or Digital Zoom by load module to control module, and then control module control optical zoom module or the unlatching of Digital Zoom module.
A kind of Focalizing arrangement for camera of the present invention and method, compared with prior art, have following beneficial effect: the present invention need not by the zoom button zoom multiple to be controlled, but sense distance be used to the measured object of focusing by range sensor, determine the zoom size according to distance, thereby avoided using the reaction of zoom button slow in the prior art, poor sensitivity, defective that precision is low, and can flexibly and fast realize the camera zoom.
Description of drawings
Fig. 1 is the structured flowchart of Focalizing arrangement for camera of the present invention.
Fig. 2 is distance measuring sensor monitoring distance block plan in the camera focusing method of the present invention.
Fig. 3 is camera focusing method flow diagram of the present invention.
Embodiment
In order to make those skilled in the art person understand better technical solution of the present invention, the present invention is described in further detail below in conjunction with drawings and embodiments.
Described Focalizing arrangement for camera comprises:
Distance measuring sensor links to each other with control module, is used for detecting when focusing the distance of measured object distance ranging sensor, and the range information that records is sent to control module; This distance measuring sensor is the infrared distance measuring sensor, this infrared distance measuring is a kind of sensor that utilizes the infrared reflection principle that obstacle distance is measured from sensor, utilize infrared signal to run into the also different principle of intensity of the difference reflection of obstacle distance, carry out the detection of barrier distance.
Infrared distance sensor has a pair of infrared signal emission and reception diode, the infrared signal of power valve emission characteristic frequency, receiving tube receives the infrared signal of this frequency, when infrared detection side when running into barrier, infrared signal reflects received pipe and receives, after processing, turn back to main frame by digital sensor interface, main frame can utilize infrared return signal to identify the variation of surrounding environment.
Described control module links to each other with zoom modules, is used for receiving the range information that distance measuring sensor sends, and judges according to range information, transmits control signal to zoom modules;
Described zoom modules is used for carrying out zoom according to the control signal that control module is sent, and comprises optical zoom module and/or Digital Zoom module.
Wherein, described Digital Zoom module comprises digital signal processor, image sensor and A/D converter, and wherein A/D converter links to each other with image sensor with digital signal processor respectively.Simultaneously, be provided with the Digital Zoom control module in control module, the control figure signal processor carries out independent amplification with the image information that the photosensitive unit in a certain zone in the image sensor obtains.
Described Focalizing arrangement for camera also comprises load module, and this load module links to each other with control system, is used for the signal that input starts focusing, and input selection uses the signal of optical zoom or Digital Zoom.
Described load module is physical button or virtual key.So-called physical button namely is arranged on the keyboard components on the digital camera housing; So-called virtual key, referring to be implemented in the touch screen display by program also can be according to touching the button that triggers.
A kind of camera focusing method of the present invention relies on above-mentioned Focalizing arrangement for camera to be achieved, and may further comprise the steps:
1) load module sends the instruction that starts focusing to control system; This step is carried out for being confirmed whether by the people, namely when needing to focus, artificially triggers the startup focusing button in the load module in shooting process, and then load module sends this instruction to control system; As not needing focusing, then need not to trigger startup focusing button, digital camera is in the focusing step state that do not enter all the time;
2) step of choice for use optical zoom or Digital Zoom sends the signal of selecting optical zoom or Digital Zoom by load module to control module, and then control module control optical zoom module or the unlatching of Digital Zoom module;
3) distance measuring sensor is measured the distance of measured object distance ranging sensor, and the range information that records is sent to control module; This measured object can be shooting person's finger or other objects that sensor monitored of can being found range;
4) control module receives the range information that distance measuring sensor sends, and according to range information, distance and zoom multiple corresponding relation that contrast is default draw corresponding zoom multiple, transmit control signal to zoom modules;
This distance and zoom multiple corresponding relation set in advance and are stored in the storage unit in the control module, after control module receives range information, transfer the mapping table in the storage unit, draw corresponding zoom multiple.
For example, referring to Fig. 2, distance measuring sensor 2 is positioned on the digital camera 1, when being 0, the distance A of measured object and distance measuring sensor 2 is made as the I district, when the distance A of measured object and distance measuring sensor is made as the II district during less than or equal to 1cm greater than 0, when distance A is made as the III district during less than or equal to 2cm greater than 1cm, when distance A is made as the IV district during less than or equal to 3cm greater than 2cm;
If camera zoom level Four, measured object and distance measuring sensor distance be zoom multiple X1 during for IV district, zoom multiple X2 apart from for the III district time, zoom multiple X3 apart from for the II district time, zoom multiple X4 reaches maximal value during the I district;
If camera zoom secondary, then measured object and distance measuring sensor not when the I district, zoom multiple X1; During for the I district, zoom multiple X2 reaches maximal value.
Referring to shown in Figure 3, the camera zoom multiple in level Four, the optical zoom of the camera zoom multiple among the figure in the Digital Zoom describes the flow process of camera focusing method of the present invention as secondary as example.
5) control signal sent according to control module of zoom modules is carried out zoom.
The above only is preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (9)
1. Focalizing arrangement for camera comprises:
Distance measuring sensor links to each other with control module, is used for detecting when focusing the distance with measured object, and the range information that records is sent to control module;
Control module links to each other with zoom modules, is used for receiving the range information that distance measuring sensor sends, and the default distance and zoom multiple corresponding relation of contrast, determines corresponding zoom multiple, and the zoom multiple transmits control signal to zoom modules according to this;
Zoom modules is used for carrying out zoom according to the control signal that control module is sent.
2. Focalizing arrangement for camera as claimed in claim 1, it is characterized in that: described zoom modules comprises optical zoom module or Digital Zoom module.
3. Focalizing arrangement for camera as claimed in claim 2, it is characterized in that: described Digital Zoom module comprises digital signal processor, image sensor and A/D converter, wherein A/D converter links to each other with image sensor with digital signal processor respectively.
4. Focalizing arrangement for camera as claimed in claim 1, it is characterized in that: described distance measuring sensor is infrared distance sensor.
5. such as each described Focalizing arrangement for camera of claim 1 to 4, it is characterized in that: described Focalizing arrangement for camera also comprises load module, this load module links to each other with control system, is used for the signal that input starts automatic focusing, and input selection uses the signal of optical zoom or Digital Zoom.
6. Focalizing arrangement for camera as claimed in claim 5, it is characterized in that: described load module is physical button or virtual key.
7. camera focusing method may further comprise the steps:
1) distance measuring sensor is measured the distance with measured object, and the range information that records is sent to control module;
2) control module receives the range information that distance measuring sensor sends, and the default distance and zoom multiple corresponding relation of contrast, determine corresponding zoom multiple, and the zoom multiple transmits control signal to zoom modules according to this;
3) zoom modules carries out zoom according to the control signal that control module is sent.
8. camera focusing method as claimed in claim 7 is characterized in that: also comprise the step that starts automatic focusing before the described step 1, send enabling signal by load module to control module, and then control module control distance measuring sensor is opened.
9. camera focusing method as claimed in claim 8, it is characterized in that: the step that also comprises choice for use optical zoom or Digital Zoom after the step of described startup automatic focusing is finished, send the signal of selecting optical zoom or Digital Zoom by load module to control module, and then control module control optical zoom module or the unlatching of Digital Zoom module.
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| CN2012105571819A CN103048765A (en) | 2012-12-18 | 2012-12-18 | Camera focusing device and method |
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| CN2012105571819A CN103048765A (en) | 2012-12-18 | 2012-12-18 | Camera focusing device and method |
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| CN103702029A (en) * | 2013-12-20 | 2014-04-02 | 百度在线网络技术（北京）有限公司 | Method and device for prompting focusing during shooting |
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Application publication date: 20130417 |