Exposure control method of image sensor
An image sensor and exposure control technology, applied in the field of image sensors, can solve the problems that image sensors cannot effectively adapt to the complex environment, cannot adjust the exposure state, and do not consider image information, etc.
Active Publication Date: 2019-09-17
CHENGDU LIGHT COLLECTOR TECH
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[0003] The automatic exposure control algorithm includes a photometry algorithm and an adjustment algorithm. The common photometry algorithm is based on the average brightness value of the image or the statistical method of the image histogram. Basically, the image information is not considered, and it cannot effectively adapt to the complex environment that the image sensor needs to face. , the exposure state of the next frame image cannot be quickly adjusted according to the image information of the current frame. Therefore, the existing automatic exposure control algorithm of the image sensor has obvious shortcomings
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[0047]In order to make the purpose, technical solution and advantages of the present invention clearer, the specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0048] The automatic exposure algorithm calculates the most reasonable target exposure parameters by metering and analyzing the current exposure parameters. as attached figure 1 shown, with figure 1 is the Pixel output response curve, and the Pixel response is linearly proportional to the product of the exposure time Expt and the ambient light Ls, and is proportional to the gain Gain, as follows:
[0049] in, and Represent the average response of the current frame image and the next frame image, respectively.
[0050] Assuming the first image is the current image, Available via statistical images, Expt x and Gain x It is also known that is the set target average brightness, because the time interval between the ...
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The invention discloses an exposure control method for an image sensor, which comprises the following steps of: S01, calculating a brightness estimation value of a current frame image of the image sensor, and specifically comprises the following steps: S011, judging whether each pixel point in the image is an edge pixel point or not; S012, dividing the image into M*N image blocks, and judging whether the image blocks are candidate blocks or not according to the number of edge pixel points in the image blocks; S013, obtaining a non-foreground area in the image according to the positions of the candidate blocks; s014, calculating a brightness estimation value YEST of the current frame image; and S02, adjusting the exposure time and the gain value of the next frame of image according to the brightness estimation value of the current frame of image. According to the exposure control method of the image sensor provided by the invention, image pixels of a non-foreground area are weighted, and a brightness estimation value of a current image is calculated; and the exposure time and gain parameters of the next frame of image can be rapidly and reasonably changed, so that a relatively good exposure image is obtained.
Description
technical field [0001] The invention relates to the field of image sensors, in particular to an exposure control method of an image sensor. Background technique [0002] In the imaging process of the image sensor, exposure is crucial to the image quality, and the image sensor can only obtain high-quality images with the correct exposure. If the exposure is over-exposed, the image will be too bright and the overall image will be whitened, and the details of the image will be lost; if the exposure is under-exposed, the image will be too dark, and the image details will also be lost. The automatic exposure is to design an algorithm so that the sensor can automatically adjust the exposure time and image gain parameters, so that the image brightness reaches the target brightness value range to meet the needs of users. In recent years, image sensors, automotive electronics and other fields have developed rapidly, and it is necessary to design an automatic exposure control algorit...
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IPC IPC(8): H04N5/235
CPCH04N23/71H04N23/73
Inventor 王世平王勇温建新宋博
Owner CHENGDU LIGHT COLLECTOR TECH