Automatic exposure processing method and apparatus with back-light compensation

Abstract

The invention, which belongs to the technical field of the video image processing technology, particularly relates to an automatic exposure processing method and apparatus with back-light compensation. The method comprises: brightness data of an image frame are calculated and histogram information is obtained; according to the histogram information and the image brightness information, whether the image ins in a back-light state is determined; if so, back-light compensation processing is executed; and if the image is in a normal light state, automatic exposure processing is carried out. According to the technical scheme, the image frame is collected by the camera in real time and thus whether the image is in the backlight situation is determined; and a backlight phenomenon of an image collected subsequently is improved by adjusting the exposure value of the camera. The exposure value is increased restrictedly, so that the brightness of the relatively dark area is enhanced and the definition is improved. Therefore, a problem that identification is affected because of insufficient face brightness under the circumstance that the backlight problem is solved by automatic exposure in the prior art can be solved.

Description

technical field [0001] The invention belongs to the technical field of video image processing, and in particular relates to an automatic exposure processing method and device with backlight compensation. Background technique [0002] In building monitoring and intercom scenarios, for the images captured by the camera, more emphasis is placed on the clarity of nearby faces than the surrounding environment. When the camera is shooting in a backlight environment, a black image will appear on the screen. However, the backlight environment is unavoidable in security. At this time, backlight compensation processing is required. The traditional backlight compensation processing is basically for the video that has been shot. Or the image is compensated by using different algorithms, which cannot adjust the exposure value of the camera and improve the backlight phenomenon of subsequent captured images. In addition, if the face is in a backlit scene, the traditional automatic exposur...

AI Technical Summary

Problems solved by technology

[0005] One of the purposes of the present invention is to overcome the above shortcomings, through image data processing, and adjust the exposure value of the camera according to the result, improve the quality of the subsequent image acquisition, and at the same time solve the problem that the face is in a backlit scene, the traditional automatic exposure processing is to suppress the excessively bright backlight , the exposure value will be adjusted to a lower value, resulting in insufficient brightness of the face and affecting the recognition of the face

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