Histogram Equalization is a basic image processing technique to boost contrasts, the histogram equalization is often used in the pre-processing phase to make video more plausible.
However, a straight way of histogram equalization can incur strong contouring effects (and consequently an encoder would consume more bits for retention of these superfluous edges). Moreover, by boosting of contrasts we might make camera noise visible.
# convert BGR to gray
# apply straightforward histogram equalization
23+ years’ programming and theoretical experience in the computer science fields such as video compression, media streaming and artificial intelligence (co-author of several papers and patents).
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