A method for two-level automatic exposure of video images
An automatic exposure, video image technology, applied in image communication, color TV parts, TV system parts and other directions, can solve problems such as poor exposure quality, manual adjustment of exposure parameters, and limited use environment requirements.
Active Publication Date: 2015-12-09
四川九洲投资控股集团有限公司
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Problems solved by technology
The existing exposure methods have the following problems: first, the exposure parameters are fixed, and a specific exposure mode can only meet the needs of specific light occasions, and the quality of exposure is not good for the environment after the light changes; second, the exposure parameters are manual Adjustable. Although the exposure method can be adjusted, it cannot be adjusted automatically according to the ambient light. It must be controlled manually, which limits the requirements of the use environment.
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[0028] The present invention will be further described below in conjunction with the accompanying drawings.
[0029] like figure 1 As shown, step 1: preset exposure reference extreme values, including: maximum brightness value L, maximum aperture value F, first-level maximum exposure time T1 and maximum analog gain G1, second-level maximum exposure time T2 and maximum analog gain G2 , the maximum digital gain G d .
[0030] The requirements of T1, T2, G1, and G2 here are as follows: T2>T1, G2>G1. When the combination of the first-level maximum exposure time T1 and the maximum analog gain G1 cannot achieve the required exposure brightness, the second-level maximum The combination of exposure time T2 and maximum analog gain G2 makes the exposure.
[0031] The maximum brightness value L here is an empirical value, which can be observed and selected by setting the exposure parameters multiple times to select the most appropriate maximum brightness value L.
[0032] The maximum...
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The invention relates to a method for two-stage automatic exposure of a video image. The method comprises the following four steps of presetting an exposure reference extreme value; performing first stage exposure, performing second stage exposure, and setting a final exposure parameter value; and completing the automatic exposure by adjusting the maximum exposure time and the maximum analog gain twice. According to the method, the maximum exposure time can be set according to difference in the requirements for the maximum frame rate; when the fluency of the video image is required, the shorter exposure time can be set so as to meet the requirement for the frame rate; and meanwhile, the maximum analog gain is set on the basis of meeting the maximum exposure time, so that the requirement for the specified luminance of the automatic exposure is met.
Description
technical field [0001] The invention relates to the field of image processing, in particular to a method for two-stage automatic exposure of video images. Background technique [0002] Image digital processing technology is a technology that performs various processing after sampling and quantizing analog image signals. At present, various processing technologies for image quality, including image noise reduction, contrast, edge enhancement, etc., can all play a role in improving and enhancing the image quality. But before the image signal can be digitized, the image signal sensor must be perfectly exposed. Any impact of underexposure and overexposure on image quality will cause a lot of tedious work in the post-digital processing. [0003] The essence of automatic exposure is to set a target value of image brightness that can be acquired by the sensor according to the optimal value of ambient light adapted to by the human naked eye, and adjust various parameters of the ca...
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IPC IPC(8): H04N5/235H04N5/243H04N5/359H04N23/76
Inventor 孙彬阮思恩
Owner 四川九洲投资控股集团有限公司