CN102547132A - Method and device for carrying out shooting under backlighting condition, and camera - Google Patents
Method and device for carrying out shooting under backlighting condition, and camera Download PDFInfo
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- CN102547132A CN102547132A CN2011104593623A CN201110459362A CN102547132A CN 102547132 A CN102547132 A CN 102547132A CN 2011104593623 A CN2011104593623 A CN 2011104593623A CN 201110459362 A CN201110459362 A CN 201110459362A CN 102547132 A CN102547132 A CN 102547132A
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Abstract
The invention discloses a method and device for carrying out shooting under a backlighting condition, and a camera. The device comprises a normally shooting module for carrying out shooting in an automatic exposure manner to obtain original image data, and a specially shooting module for adjusting an exposure parameter according to a processing result of the original image data and carrying out shooting according to the adjusted exposure parameter. The shooting process is divided into two steps of normally shooting and specially shooting, and is analyzed according to the image data obtained by normal shooting; exposure time is adjusted according to an analysis result and reshooting is carried out, thus the purpose of being capable of clearly shooting a backlight face of an object to be shot under the backlighting condition is achieved.
Description
Technical field
The present invention relates to the image capture techniques field, relate in particular to a kind of method of under the reversible-light shooting condition, taking and device and a kind of video camera that adopts this device.
Background technology
When using video camera to take, no matter be, the situation of reversible-light shooting all possibly take place at indoor or outdoors.This reversible-light shooting often makes subject dark excessively, and background is bright excessively, makes resulting image can't clearly find out subject.For example, adopt the road monitoring video camera on road during round-the-clock shooting vehicular traffic, can run into the problem of reversible-light shooting in section sometime; Meet right strong incident ray with respect to video camera this moment; The front light of vehicle is then dim, and because video camera is met strong incident ray, the photosensitive control link of video camera will be controlled transducer with very short time exposure; Under very short conditions of exposure; The vehicle front can seem in picture very dark (this moment, the vehicle front was called shady face), to such an extent as to can make the car plate in the vehicle front not see, is unfavorable for road monitoring.In addition, as shown in Figure 1, the shooting visual field 10 of video camera with automatic exposure photometry region 11 usually with respect to vehicle 12 than broad, therefore, the brightness deficient change in the photometry region is to judge whether the vehicle process is wherein arranged.And; Be greater than vehicle (being subject) owing to take the visual field shared picture in picture; Under the backlight situation, video camera is according to the light status exposure of taking the visual field, and this makes that the insufficient shady face that causes subject then of subject exposure is very dark and does not have details.
Therefore; How to judge whether that subject gets into the shooting visual field and how to carry out reversible-light shooting to obtain the photographic images of better quality to getting into the subject of taking the visual field; Be the direction of industry ongoing effort, this problem demanding prompt solution especially for road monitoring especially.
Summary of the invention
An aspect according to the embodiment of the invention; A kind of method of under the backlight condition, taking is provided; Comprise: the normal photographing step, take by the automatic exposure mode and to obtain raw image data, special shooting step; According to the result of raw image data being carried out the exposure parameter adjustment, take according to adjusted exposure parameter.
Said special shooting step comprises: the piecemeal step, the predetermined number piecemeal is pressed in zone corresponding with the photometry region of automatic exposure in the said raw image data; Determining step has judged whether that according to the first color characteristic amount of each piece subject gets into photometry region; The exposure set-up procedure gets into photometry region when judgement has subject, according to the second color characteristic amount adjustment time for exposure of each piece; Take step, take according to the adjusted time for exposure.
Said determining step comprises: first characteristic quantity calculates substep, calculates said each piece respectively and distributes in the color saturation of HSI color space; Change and judge substep, judge the color saturation of said each piece distributes whether there is variation, if then showing has subject to get into photometry region.
Said exposure set-up procedure comprises: second characteristic quantity calculates substep; When having subject, judgement gets into photometry region; Calculate the changing value of mean value of the luminous intensity of said each piece respectively, from the changing value of the mean value of the luminous intensity of said each piece, select the maximum of changing value; Time for exposure adjustment substep, according to the said maximum adjustment time for exposure, make the mean value of the piece luminous intensity corresponding that obtains after the exposure with this maximum equal said maximum and with the mean value sum of the luminous intensity of the corresponding piece of this maximum.
Said each piece comprises in the color saturation distribution of HSI color space: the color saturation of each piece that will calculate is made histogram distribution by predetermined step-length; The predetermined number piecemeal is pressed according to the moving direction of subject in the said piecemeal step zone that said photometry region is corresponding.
According to another aspect of the embodiment of the invention, a kind of device of under the backlight condition, taking is provided, comprising: the normal photographing module is used for taking by the automatic exposure mode and obtains raw image data; Special taking module is used for taking according to adjusted exposure parameter according to the result of raw image data being carried out the exposure parameter adjustment.
Said special taking module comprises: the piecemeal module is used for photometry region by the predetermined number piecemeal; Judge module is used for having judged whether that according to the first color characteristic amount of each piece subject gets into photometry region; The exposure adjusting module is used for having subject to get into photometry region when judging, according to the second color characteristic amount adjustment time for exposure of each piece; Taking module is used for taking according to the adjusted time for exposure.
Said judge module comprises: the first characteristic quantity calculating sub module is used for calculating respectively said each piece and distributes in the color saturation of HSI color space; Change and judge submodule, be used to judge the color saturation of said each piece distributes whether there is variation, if then showing has subject to get into photometry region.
Said exposure adjusting module comprises: the second characteristic quantity calculating sub module; Be used for having subject to get into photometry region when judging; Calculate the changing value of mean value of the luminous intensity of said each piece respectively, from the changing value of the mean value of the luminous intensity of said each piece, select the maximum of changing value; Time for exposure adjustment submodule was used for according to the said maximum adjustment time for exposure, make the mean value of the piece luminous intensity corresponding that obtains after the exposure with this maximum equal said maximum and with the mean value sum of the luminous intensity of the corresponding piece of this maximum.
Another aspect according to the embodiment of the invention provides a kind of video camera, uses the aforesaid device of under the backlight condition, taking in this video camera.
The invention has the beneficial effects as follows: shooting process is divided into normal photographing and two steps of special shooting; View data according to normal photographing obtains is analyzed; According to the shooting again again of analysis result adjustment time for exposure, thereby reach the shady face that under the reversible-light shooting condition, also can clearly photograph subject.
Description of drawings
Fig. 1 takes the visual field and exposure photometry region sketch map for video camera;
Fig. 2 is the sketch map with the photometry region piecemeal;
Fig. 3 is the structural representation of the device taken under the backlight condition of a kind of embodiment;
Fig. 4 is the schematic flow sheet of the method for taking under the backlight condition of a kind of embodiment.
Embodiment
Combine accompanying drawing that the present invention is done further explain through embodiment below.
As shown in Figure 3, the device of taking under the backlight condition of a kind of embodiment comprises: normal photographing module and special taking module, normal photographing module are used for taking by the automatic exposure mode and obtain raw image data; Special taking module is used for taking according to adjusted exposure parameter according to the result of raw image data being carried out the exposure parameter adjustment.Here, the normal photographing mode that the normal photographing module is well known to those skilled in the art is promptly taken to obtain raw image data according to the modes of setting in the video camera such as automatic exposure.Special taking module comprises piecemeal module 301, judge module 303, exposure adjusting module 305 and taking module 307.For piecemeal module 301, it is used for the zone that raw image data is corresponding with the photometry region of automatic exposure by the predetermined number piecemeal; Among the embodiment photometry region is carried out piecemeal according to the moving direction of subject by predetermined number, for example be divided into 8, as shown in Figure 2.For judge module 303, it is used for having judged whether that according to the first color characteristic amount of each piece subject gets into photometry region; Particularly; Judge module 303 comprises that the color saturation that is used for calculating respectively the first characteristic quantity calculating sub module that each piece distributes in the color saturation of HSI color space and is used to judge each piece variation that whether has variation that distributes judges submodule; Change if determine to exist, then showing has subject to get into photometry region.For exposure adjusting module 305, it is used for having subject to get into photometry region when judging, according to the second color characteristic amount adjustment time for exposure of each piece; Particularly; Exposure adjusting module 305 comprises: the second characteristic quantity calculating sub module and time for exposure adjustment submodule; The second characteristic quantity calculating sub module is used for having subject to get into photometry region when judging; Calculate the changing value of mean value of the luminous intensity of each piece respectively, from the changing value of the mean value of the luminous intensity of each piece, select the maximum of changing value; Time for exposure adjustment submodule then was used for according to this maximum adjustment time for exposure, make the mean value of the piece luminous intensity corresponding that obtains after the exposure with this maximum equal this maximum and with the mean value sum of the luminous intensity of the corresponding piece of this maximum.307 of taking modules were taken according to the adjusted time for exposure.
Embodiment based on the device of taking under the above-mentioned backlight condition; Another kind of embodiment provides the method for taking under the corresponding backlight condition; Comprise by the automatic exposure mode and take normal photographing step and the special shooting step that obtains raw image data; Special shooting step is taken according to adjusted exposure parameter according to the result of raw image data being carried out the exposure parameter adjustment.Special shooting step comprises: determining step has judged whether that according to the first color characteristic amount of each piece subject gets into photometry region; The exposure set-up procedure gets into photometry region when judgement has subject, according to the second color characteristic amount adjustment time for exposure of each piece; Take step, take according to the adjusted time for exposure.Each module of the device embodiment that takes under each step and the aforementioned backlight condition is corresponding one by one.
Below be example under the reversible-light shooting condition, to take vehicle in the road monitoring; Be divided into some through sailing photometry region into direction by vehicle; Calculate the variation that image takes place in each piece, and control the exposure of video camera in view of the above, thereby reach clear purpose of taking the shady face of subject; As shown in Figure 4, the handling process of this method embodiment comprises:
Step S401 sails photometry region into direction by vehicle and is divided into some;
Step S402 converts the view data of each piece into the HSI color space by rgb color space; Should be understood that taking what obtain in the normal photographing step is not to be visual image, but the view data that exists with the Bayer form, what these view data showed is the information of rgb color space.The transfer algorithm that conversion method can adopt those skilled in the art to know, the algorithm that RGB commonly used is transformed into HSI is shown below:
Step S403 calculates the mean value of luminous intensity in each piece (being I component);
Step S404 calculates the distribution of saturation in each piece (being the S component), among the embodiment, the S component is made with the form of histogram distribution by 1% step-length;
Step S405 judges the variation that the S component distributes in each piece, if the variation that the S component distributes appears in certain piece of dividing by vehicle heading, then judging has vehicle to get into photometry region;
Step S406 if there is vehicle to get into photometry region, calculates the changes delta I of mean value of the I component of each piece, and finds out maximum Δ I wherein
Max
Step S407, makes adjusted luminous intensity I '=I+ Δ I at the time for exposure of adjusting video camera upper sensor
Max
To sum up, embodiment is divided into some through sailing photometry region into direction by vehicle, calculates the variation that image takes place in each piece, and controls the exposure of video camera in view of the above, thereby reaches clear purpose of taking the shady face of subject.
Based on the embodiment of the device of taking under the above-mentioned backlight condition, another kind of embodiment provides a kind of video camera, adopts the device of taking under this backlight condition in this video camera.
The foregoing description is of the present invention giving an example; Although disclose most preferred embodiment of the present invention and accompanying drawing for the purpose of illustration; But it will be appreciated by those skilled in the art that: in the spirit and scope that do not break away from the present invention and appended claim, various replacements, variation and modification all are possible.Therefore, the present invention should not be limited to most preferred embodiment and the disclosed content of accompanying drawing.
Claims (10)
1. a method of under the backlight condition, taking is characterized in that, comprising:
The normal photographing step is taken by the automatic exposure mode and to be obtained raw image data;
Special shooting step according to the result of raw image data being carried out the exposure parameter adjustment, is taken according to adjusted exposure parameter.
2. the method for reversible-light shooting as claimed in claim 1 is characterized in that, said special shooting step comprises:
The piecemeal step is pressed the predetermined number piecemeal with zone corresponding with the photometry region of automatic exposure in the said raw image data;
Determining step has judged whether that according to the first color characteristic amount of each piece subject gets into photometry region;
The exposure set-up procedure gets into photometry region when judgement has subject, according to the second color characteristic amount adjustment time for exposure of each piece;
Take step, take according to the adjusted time for exposure.
3. the method for reversible-light shooting as claimed in claim 3 is characterized in that, said determining step comprises:
First characteristic quantity calculates substep, calculates said each piece respectively and distributes in the color saturation of HSI color space;
Change and judge substep, judge the color saturation of said each piece distributes whether there is variation, if then showing has subject to get into photometry region.
4. like the method for claim 2 or 3 described reversible-light shootings, it is characterized in that said exposure set-up procedure comprises:
Second characteristic quantity calculates substep, gets into photometry region when judgement has subject, calculates the changing value of mean value of the luminous intensity of said each piece respectively, from the changing value of the mean value of the luminous intensity of said each piece, selects the maximum of changing value;
Time for exposure adjustment substep, according to the said maximum adjustment time for exposure, make the mean value of the piece luminous intensity corresponding that obtains after the exposure with this maximum equal said maximum and with the mean value sum of the luminous intensity of the corresponding piece of this maximum.
5. like the method for each described reversible-light shooting of claim 2-4, it is characterized in that said each piece distributes in the color saturation of HSI color space and comprises the color saturation of each piece that calculates is made histogram distribution by predetermined step-length; The predetermined number piecemeal is pressed according to the moving direction of subject in the said piecemeal step zone that said photometry region is corresponding.
6. a device of under the backlight condition, taking is characterized in that, comprising:
The normal photographing module is used for taking by the automatic exposure mode and obtains raw image data;
Special taking module is used for taking according to adjusted exposure parameter according to the result of raw image data being carried out the exposure parameter adjustment.
7. the device of reversible-light shooting as claimed in claim 6 is characterized in that, said special taking module comprises:
The piecemeal module is used for photometry region by the predetermined number piecemeal;
Judge module is used for having judged whether that according to the first color characteristic amount of each piece subject gets into photometry region;
The exposure adjusting module is used for having subject to get into photometry region when judging, according to the second color characteristic amount adjustment time for exposure of each piece;
Taking module is used for taking according to the adjusted time for exposure.
8. the device of reversible-light shooting as claimed in claim 7 is characterized in that, said judge module comprises:
The first characteristic quantity calculating sub module is used for calculating respectively said each piece and distributes in the color saturation of HSI color space;
Change and judge submodule, be used to judge the color saturation of said each piece distributes whether there is variation, if then showing has subject to get into photometry region.
9. like the device of claim 7 or 8 described reversible-light shootings, it is characterized in that said exposure adjusting module comprises:
The second characteristic quantity calculating sub module is used for having subject to get into photometry region when judging, calculates the changing value of mean value of the luminous intensity of said each piece respectively, from the changing value of the mean value of the luminous intensity of said each piece, selects the maximum of changing value;
Time for exposure adjustment submodule was used for according to the said maximum adjustment time for exposure, make the mean value of the piece luminous intensity corresponding that obtains after the exposure with this maximum equal said maximum and with the mean value sum of the luminous intensity of the corresponding piece of this maximum.
10. a video camera is characterized in that, comprises each described device of under the backlight condition, taking like claim 6-9.
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| CN2011104593623A CN102547132A (en) | 2011-12-31 | 2011-12-31 | Method and device for carrying out shooting under backlighting condition, and camera |
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| CN105224932A (en) * | 2015-10-21 | 2016-01-06 | 北京旷视科技有限公司 | A kind of face identification method and system |
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| CN107241556A (en) * | 2016-03-29 | 2017-10-10 | 中兴通讯股份有限公司 | The light measuring method and device of image capture device |
| CN107370940A (en) * | 2017-06-16 | 2017-11-21 | 广东欧珀移动通信有限公司 | Image acquiring method, device and terminal device |
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| CN102799872A (en) * | 2012-07-17 | 2012-11-28 | 西安交通大学 | Image processing method based on face image characteristics |
| CN102799872B (en) * | 2012-07-17 | 2015-04-29 | 西安交通大学 | Image processing method based on face image characteristics |
| CN103810463A (en) * | 2012-11-14 | 2014-05-21 | 汉王科技股份有限公司 | Face recognition device and face image detection method |
| CN103841337A (en) * | 2012-11-23 | 2014-06-04 | 北京百度网讯科技有限公司 | Backlight compensation method and device |
| CN103841337B (en) * | 2012-11-23 | 2017-04-05 | 北京百度网讯科技有限公司 | The method and apparatus of BLC |
| CN103856718B (en) * | 2014-03-26 | 2017-02-15 | 努比亚技术有限公司 | Photo synthesis method and photo synthesis device |
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| CN105611140A (en) * | 2015-07-31 | 2016-05-25 | 宇龙计算机通信科技(深圳)有限公司 | Photographing control method, photographing control device and terminal |
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| CN107241556A (en) * | 2016-03-29 | 2017-10-10 | 中兴通讯股份有限公司 | The light measuring method and device of image capture device |
| CN107241556B (en) * | 2016-03-29 | 2021-02-23 | 中兴通讯股份有限公司 | Light measuring method and device of image acquisition equipment |
| CN107370940A (en) * | 2017-06-16 | 2017-11-21 | 广东欧珀移动通信有限公司 | Image acquiring method, device and terminal device |
| CN107370940B (en) * | 2017-06-16 | 2019-08-02 | Oppo广东移动通信有限公司 | Image acquiring method, device and terminal device |
| CN110913123A (en) * | 2019-08-15 | 2020-03-24 | 厦门亿联网络技术股份有限公司 | Anti-backlight automatic exposure method and device based on image blocking filtering and electronic equipment |
| CN110913123B (en) * | 2019-08-15 | 2021-06-04 | 厦门亿联网络技术股份有限公司 | Anti-backlight automatic exposure method and device based on image blocking filtering and electronic equipment |
| CN116878402A (en) * | 2023-07-11 | 2023-10-13 | 北京博科测试***股份有限公司 | Non-contact wheel arch measuring sensor and method |
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