Image illumination compensation algorithm, " reference white" algorithm. The brightness of all pixels in the entire image are arranged high to low, taking the top 5 of the pixels, if the number of these pixels enough (e.g., " 100), which will be used as reference white luminance, the RGB components thereof are adjusted to a maximum of 255 other pixel color values ​ ​ according to this scale also adjusted.

light_rw.m

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