CN103957362A - Method and system for automatically adjusting exposure effect of camera - Google Patents
Method and system for automatically adjusting exposure effect of camera Download PDFInfo
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- CN103957362A CN103957362A CN201410187119.4A CN201410187119A CN103957362A CN 103957362 A CN103957362 A CN 103957362A CN 201410187119 A CN201410187119 A CN 201410187119A CN 103957362 A CN103957362 A CN 103957362A
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Abstract
A method for automatically adjusting the exposure effect of a camera comprises the following steps that S1, a statistical thread is created; S2, preview is started, whole-image data are divided into a plurality of sub-regions; S3, brightness information of each sub-region is collected; S4, according to the brightness information of each sub-region, high-brightness regions and low-brightness regions are determined; S5, according to the exposure algorithm, corresponding exposure parameters are adopted for the high-brightness regions and the low-brightness regions; S6, after exposure adjustment is carried out on the regions having different types of brightness in the whole-image data, the step S4 is repeated if the camera is not switched off, and related statistical thread resources are released if the camera is switched off. By means of the method and system for automatically adjusting the exposure effect of the camera, when photographing is carried out on an occasion where the brightness contrast is high, exposure control over the high-brightness regions in an image can be carried out so that overexposure can be prevented, exposure control over the low-brightness regions can be carried out so that underexposure can be prevented, the exposure effect can be improved effectively, detail portions of the image are kept as many as possible, and imaging quality is promoted.
Description
Technical field
The present invention relates to a kind of method and system of automatic adjustment camera exposure effect.
Background technology
When camera exposure refers in camera preview or takes pictures, camera photo-sensitive cell, according to current ambient brightness, is recorded as the process of the monochrome information of image.Exposure has automatic exposure and Manual exposure to compensate two kinds.The camera of smart mobile phone is generally given tacit consent to and is adopted the method for automatic exposure, adds Manual exposure compensation and arrange to regulate the exposure effect of image, and exposure compensating can overall enhanced or weakened the brightness of image.
Current automatic exposure is all done single exposure for whole two field picture, this processing method is for the uniform scene of some brightness, image exposure effect is still more gratifying, but in the time of the obvious scene of some comparison of light and shades, whole two field picture is carried out to the processing method of automatic exposure, there will be dark place to owe to expose to the sun, the phenomenon of bright place overexposure, the detail section mass loss of image is serious.Therefore, be necessary to provide a kind of new exposure processing method, to improve the picture quality when the obvious scene of some comparison of light and shades.
Summary of the invention
In order to overcome deficiency of the prior art, the invention provides a kind of method and system of automatic adjustment camera exposure effect, to improve the exposure effect when the obvious scene of some comparison of light and shades, thereby greatly promote the quality of image detail part.
The present invention is achieved by the following technical solutions:
A method for automatic adjustment camera exposure effect, is applied to that have can support area in the camera apparatus of photo-sensitive cell of exposure, and the concrete steps of described method comprise:
S1, when starting after camera, create a statistics thread;
S2, startup preview, and whole frame image data is divided into multiple sub-blocks region;
S3, the monochrome information of adding up each sub-block region;
S4, according to the monochrome information in each sub-block region, determine lightness region and dark luminance area;
S5, lightness region and dark luminance area are taked to corresponding exposure parameter, to prevent the overexposure of lightness region or to prevent that dark luminance area is under-exposure;
S6, to the different region of each light and shade brightness in whole frame image data expose adjust after, if do not exit camera, return to step S4; If exit camera, discharge ASSOCIATE STATISTICS thread resources.
Preferably, described step S4, by finding out the obvious light and shade of whole frame image data brightness contrast difference boundary pixel column, thereby determines that described light and shade upper and lower two parts of boundary pixel column region is lightness region or dark luminance area.
Based on foregoing invention design, the present invention also provides a kind of system of automatic adjustment camera exposure effect, and this system applies is in having the camera apparatus of photo-sensitive cell that can support area exposure, and described system comprises:
Module is divided in sub-block region, for whole frame image data being divided into multiple sub-blocks region after camera startup preview;
Statistics thread module, for adding up the monochrome information in each submodule region;
Light and shade luminance area determination module, for determining the lightness region and dark luminance area of whole frame data image according to the monochrome information of statistics thread module statistics;
Exposure parameter determination module, for determining the corresponding exposure parameter of lightness region and dark luminance area, to prevent the overexposure of lightness region or to prevent that dark luminance area is under-exposure;
Regional exposure module, adopts corresponding exposure parameter to carry out regional exposure to image for the light and shade luminance area to different.
By the present invention, in the time that camera apparatus is taken pictures facing to the obvious scene of bright dark contrast, can adopt corresponding exposure parameter to expose to lightness area part in image controls to prevent overexposure, and to dark luminance area part adopt corresponding exposure parameter expose control under-exposure to prevent, can promote to a great extent the effect of exposure, thereby retain as far as possible image detail part, promote image quality.
Brief description of the drawings
Accompanying drawing 1 is the method flow schematic diagram of the embodiment of the present invention 1;
Accompanying drawing 2 is the construction module figure of the system of the automatic adjustment camera exposure effect of the embodiment of the present invention 2;
Accompanying drawing 3 is the idiographic flow schematic diagram of application the present invention in the time taking pictures.
Embodiment
Current camera apparatus is in the time that comparison film carries out exposure-processed, all to do disposable automatic exposure processing for whole two field picture, this processing method is in the time having the photo of the obvious scene of comparison of light and shade to some, in photo, tend to occur that dark place owes to expose to the sun, the phenomenon of bright place overexposure, the detail section mass loss of the image that is is serious.And along with scientific and technical development, existing existing photo-sensitive cell that can support area exposure, as the IMX135 of Sony.Therefore, the present invention be by application in camera apparatus have can support area the photo-sensitive cell of exposure, picture is carried out to regional exposure processing, control to prevent overexposure by adopt corresponding exposure parameter to expose to lightness area part in image, and to dark luminance area part adopt corresponding exposure parameter expose control under-exposure to prevent, thereby retain as far as possible image detail part, promote image quality.Unless otherwise noted, the method and system of the automatic adjustment camera exposure effect in the present invention are to be all applied to that have can support area in the camera apparatus of photo-sensitive cell of exposure.
For the ease of those skilled in the art's understanding, below in conjunction with accompanying drawing, the invention will be further described.
Embodiment 1
As shown in Figure 1, a kind of method of automatic adjustment camera exposure effect, described method step comprises:
S1, when starting after camera, create a statistics thread;
S2, startup preview, and whole frame image data is divided into multiple sub-blocks region;
S3, the monochrome information of adding up each sub-block region;
S4, according to the monochrome information in each sub-block region, determine lightness region and dark luminance area; In the present embodiment, by find out the obvious light and shade of image data illumination contrast difference boundary pixel column in each sub-block region, thereby determine that described light and shade upper and lower two parts of boundary pixel column region is lightness region or dark luminance area;
S5, according to exposure algorithm, lightness region and dark luminance area are taked to corresponding exposure parameter, to prevent the overexposure of lightness region or to prevent that dark luminance area is under-exposure;
S6, to the different region of each light and shade brightness in whole frame image data expose adjust after, if do not exit camera, return to step S4; If exit camera, discharge ASSOCIATE STATISTICS thread resources.
In the present embodiment, the statistics thread creating by step S1 is determined light and shade boundary pixel column.This statistics thread is used for according to the preview frame per second of camera, remove to capture a frame preview image every certain frame number, by resolving the monochrome information of each pixel of every frame data, and the monochrome information of adding up each sub-block region, thereby determine the obvious light and shade of brightness contrast difference boundary pixel column.Certainly, also can carry out by other means to determine the obvious light and shade of brightness contrast difference boundary pixel column.
Embodiment 2
As shown in Figure 2, the present embodiment provides a kind of system of automatic adjustment camera exposure effect, and described system comprises:
Module is divided in sub-block region, for whole frame image data being divided into multiple sub-block regions after camera startup preview;
Statistics thread module, for adding up the monochrome information in each submodule region;
Light and shade luminance area determination module, for determining the lightness region and dark luminance area of whole frame data image according to the monochrome information of statistics thread module statistics;
Exposure parameter determination module, for determining the corresponding exposure parameter of lightness region and dark luminance area, to prevent the overexposure of lightness region or to prevent that dark luminance area is under-exposure;
Regional exposure module, adopts corresponding exposure parameter to carry out regional exposure to image for the light and shade luminance area to different.
In the present embodiment, light and shade luminance area determination module is in the time determining that lightness region in image is with dark luminance area, by find out the obvious light and shade of image data illumination contrast difference boundary pixel column in each sub-block region, thereby determine that described light and shade upper and lower two parts of boundary pixel column region is lightness region or dark luminance area; And in the time of the pixel column of definite light and shade boundary, determine by statistics thread module.Statistics thread module is according to the preview frame per second of camera, remove to capture a frame preview image every certain frame number, by resolving the monochrome information of each pixel of every frame data, and the monochrome information of adding up each sub-block region, thereby determine the obvious light and shade of brightness contrast difference boundary pixel column.
By the method for the automatic adjustment camera exposure effect in embodiment 1,2 or system applies in the time thering is the camera apparatus smart mobile phone of camera function (as have) of photo-sensitive cell that can support area exposure, exposure-processed flow process when it is taken pictures specifically as shown in Figure 3, repeats no more here.Utilize method or the system of automatic adjustment camera exposure effect provided by the invention, in the time that camera apparatus is taken pictures facing to the obvious scene of bright dark contrast, can adopt corresponding exposure parameter to expose to lightness area part in image controls to prevent overexposure, and to dark luminance area part adopt corresponding exposure parameter expose control under-exposure to prevent, can promote to a great extent the effect of exposure, thereby retain as far as possible image detail part, promote image quality.
The content of mentioning in above-described embodiment is preferably execution mode of the present invention, is not limitation of the invention, and without departing from the inventive concept of the premise, any apparent replacement is all within protection scope of the present invention.
Claims (4)
1. automatically adjust a method for camera exposure effect, be applied in the camera apparatus with photo-sensitive cell that can support area exposure, described method step comprises:
S1, when starting after camera, create a statistics thread;
S2, startup preview, and whole frame image data is divided into multiple sub-blocks region;
S3, the monochrome information of adding up each sub-block region;
S4, according to the monochrome information in each sub-block region, determine lightness region and dark luminance area;
S5, lightness region and dark luminance area are taked to corresponding exposure parameter, to prevent the overexposure of lightness region or to prevent that dark luminance area is under-exposure;
S6, to the different region of each light and shade brightness in whole frame image data expose adjust after, if do not exit camera, return to step S4; If exit camera, discharge ASSOCIATE STATISTICS thread resources.
2. method according to claim 1, it is characterized in that: described step S4, by finding out the obvious light and shade of whole frame image data brightness contrast difference boundary pixel column, thereby determine that described light and shade upper and lower two parts of boundary pixel column region is lightness region or dark luminance area.
3. automatically adjust a system for camera exposure effect, be applied in the camera apparatus with photo-sensitive cell that can support area exposure, it is characterized in that, described system comprises:
Module is divided in sub-block region, for whole frame image data being divided into multiple sub-blocks region after camera startup preview;
Statistics thread module, for adding up the monochrome information in each submodule region;
Light and shade luminance area determination module, for determining the lightness region and dark luminance area of whole frame data image according to the monochrome information of statistics thread module statistics;
Exposure parameter determination module, for determining the corresponding exposure parameter of lightness region and dark luminance area, to prevent the overexposure of lightness region or to prevent that dark luminance area is under-exposure;
Regional exposure module, adopts corresponding exposure parameter to carry out regional exposure to image for the light and shade luminance area to different.
4. system according to claim 3, it is characterized in that: described light and shade luminance area determination module is in the time determining that lightness region in whole frame data image is with dark luminance area, by finding out the obvious light and shade of whole frame image data brightness contrast difference boundary pixel column, thereby determine that described light and shade upper and lower two parts of boundary pixel column region is lightness region or dark luminance area.
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| CN104243827A (en) * | 2014-09-23 | 2014-12-24 | 深圳市中兴移动通信有限公司 | Shooting method and device |
| CN104301624A (en) * | 2014-10-30 | 2015-01-21 | 青岛海信移动通信技术股份有限公司 | Image shooting brightness control method and device |
| CN105163039A (en) * | 2015-09-18 | 2015-12-16 | 联想(北京)有限公司 | Control method and control device |
| CN105323496A (en) * | 2015-02-13 | 2016-02-10 | 维沃移动通信有限公司 | Automatic exposure method, photographing device and mobile terminal |
| CN105323495A (en) * | 2014-05-30 | 2016-02-10 | 原相科技(槟城)有限公司 | Region based shutter adaptation method for image exposure |
| CN105959591A (en) * | 2016-05-30 | 2016-09-21 | 广东欧珀移动通信有限公司 | Local HDR implementation method and system |
| CN106484257A (en) * | 2016-09-22 | 2017-03-08 | 广东欧珀移动通信有限公司 | Camera control method, device and electronic equipment |
| CN107172364A (en) * | 2017-04-28 | 2017-09-15 | 努比亚技术有限公司 | A kind of image exposure compensation method, device and computer-readable recording medium |
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| CN108124107A (en) * | 2016-11-30 | 2018-06-05 | 晨星半导体股份有限公司 | For controlling the circuit and related methods of image capture unit |
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| CN109302570A (en) * | 2018-10-23 | 2019-02-01 | 深圳市宸电电子有限公司 | A kind of environment measuring processing mode based on ROI region subgraph brightness value |
| CN109490311A (en) * | 2018-10-25 | 2019-03-19 | 武汉精立电子技术有限公司 | Backlight panel defect detecting system and method based on multi-angled shooting |
| CN109474791A (en) * | 2018-11-20 | 2019-03-15 | 深圳市趣创科技有限公司 | Image shot by camera controls exposure method, device, terminal and storage medium |
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Address after: Changan town in Guangdong province Dongguan 523860 usha Beach Road No. 18 Patentee after: GUANGDONG OPPO MOBILE TELECOMMUNICATIONS Corp.,Ltd. Address before: Changan town in Guangdong province Dongguan 523860 usha Beach Road No. 18 Patentee before: GUANGDONG OPPO MOBILE TELECOMMUNICATIONS Corp.,Ltd. |
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Granted publication date: 20170606 |