Method for conducting dynamic video-level treatment based on maximum-minimum value

Abstract

The method first, calculates brightness chart for video image; next, calculates maximum and minimum of gray scale value; then, accomplishes calculation of inflection point so as to obtain mapping function; finally, carries out gray scale transformation so as to obtain image with contrast being enhanced. In darker scene, the method raises brightness of image properly to show more visible detail; in brighter scene, the method lowers brightness of image properly to moderate supersaturated scene; and in general scene, the method stretches contrast of video image to make black become blacker, and white become whiter.

Description

technical field

[0001] The invention relates to a method for dynamic video layer processing based on maximum and minimum values. Background technique

[0002] Because the grayscale variation range of the actually captured video image is often smaller than the maximum allowable grayscale variation range of the image display system, the image is dark or bright, the contrast is insufficient, and the visual effect is not ideal. Therefore, the main purpose of the level processing is to stretch the range of the gray scale of the image, enrich the gray level of the image, and make the visual effect better.

[0003] The usual method is to apply histogram equalization technology to stretch the image to achieve the effect of enhancing the image. This method can automatically enhance the contrast of the entire image, which extends the dynamic range of the image, but it has several defects: one is The specific enhancement effect is not easy to control; the second is that some gray leve...

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