Automatic exposure control method and device, electronic equipment and storage medium

Abstract

The embodiment of the invention provides an automatic exposure control method. The method comprises the following steps: obtaining a brightness value and a current exposure parameter of a current video frame image; calculating a current illumination value; determining a current expected brightness value according to a pre-tested corresponding relation between the illumination value and the expected brightness value. In addition, the expected brightness value can be further adjusted according to the pixel brightness histogram of the image. Therefore, the exposure parameters are in a dynamic adjustment state all the time, the brightness of the image shot by using the dynamically adjusted exposure parameters can timely meet the human eye visual effect, and the quality of the shot image can beimproved.

Description

technical field [0001] The present invention relates to the technical field of image processing, in particular to an automatic exposure control method, device, electronic equipment and storage medium. Background technique [0002] Usually, surveillance cameras have the function of automatic exposure, that is, during the video shooting process, the exposure parameters, such as exposure time and exposure gain, can be adjusted according to the brightness of the currently acquired image and the preset desired brightness, so that the brightness of the image is consistent with the desired brightness. The brightness is not much different. [0003] However, in the prior art, the expected brightness of the surveillance camera is set to a fixed value, so the adaptability to the scene is relatively poor. For example, when the desired brightness setting is high, the brightness of the picture in a dark scene is quite different from the real brightness, which is inconsistent with the vis...

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Problems solved by technology

[0003] However, in the prior art, the expected brightness of the surveillance camera is set to a fixed value, so the adaptability to the scene is relatively poor

For example, when the desired brightness setting is high, there is a large difference between the brightness of the picture and the real brightness in darker scenes, which does not match the visual effect of the human eye, and the noise caused by the gain will affect the quality of the captured picture

[0004] In addition, there are many surveillance scenes where the outdoor light is strong and the indoor light is insufficient, such as the door of the business hall, the entrance and exit of the garage. At this time, the contrast of the image captured by the surveillance camera will be high, and bright areas will be overexposed. , and the underexposure of the darker area makes the quality of the captured picture not high, the picture is difficult to recognize, and the monitoring effect cannot be achieved

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