Automatic exposure control method

Abstract

The invention provides an automatic exposure control method. The method comprises the following steps of: a) obtaining a pixel value of an image; b) adjusting an integral time and gain of the image based on the pixel value feature of the image; c) judging whether or not the integral time and the gain are adjusted to predetermined target values at present; if not, entering the next step; d) judging whether the integral time and the gain are both adjusted to maximum values or minimum values at present; when the integral time and the gain are both adjusted to the maximum values but not to the target values, obtaining a pixel value with high flexibility, and performing the step b; and when the integral time and the gain are both adjusted to the minimum values but not to the target values, obtaining a pixel value with low flexibility, and performing the step b. by the embodiment of the invention, the confliction that the brightness of an image does not reach the requirement when the integral time and the gain reach limits at present can be solved; meanwhile, image flicker caused by a light source with a fixed frequency is removed, and the image is clear and bright.

Description

Technical field [0001] The invention belongs to the field of image algorithms, and particularly relates to an algorithm for automatic exposure during imaging of a photoelectric sensor. Background technique [0002] Current image capture equipment including cameras, mobile phone cameras, surveillance design and other devices that use photoelectric sensors all use automatic exposure algorithms. [0003] In the process of taking pictures, if the exposure is under-exposed, the image will be very dark and the subject is not clear. If it is over-exposed, the image will easily become bright white and a blur. The previous automatic exposure algorithm has certain defects in judging the selection of effective pixels that cause human eye sensitivity, and the gain and integration time adjustment process is not well coordinated. It is easy to appear that the gain and integration time have reached extreme values, but the image The effect has not yet reached the required phenomenon. [0004] In a...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem that the current exposure adjustment is easy to reach the extreme value and the adjustment control process when the scene with abrupt brightness suddenly appears in the image movement process cannot quickly adapt to the human eye, an automatic exposure control method is proposed. To achieve the purpose of improving the above problems

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