I have built the automated histogram equalization filter for my program. I manually check the values of the map table to make sure that the figures are calculated and arranged correctly in the table. In short, histogram equalization is similar to "Level" adjustment, which is very common in most intermediate image editor. However in this case, the calculation is not adjustable, the color is remapped by assuming the darkest point in the photo as pure black, and the brightest point in the photo as pure white, and all the colors in between are stretched are remapped accordingly.
Automated Histogram Equalization only works for unprocessed/minimally processed photo. The effect of histogram equalization on some more artistic photo will look something like the example of the red-yellow based Chrysanthemum 's photo.
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