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Histogram Equalization is a contrast enhancement te
chnique in the image processing which uses the
histogram of image. However histogram equalization
is not the best method for contrast enhancement
because the mean brightness of the output image is
significantly different from the input image. There
are
several extensions of histogram equalization has be
en proposed to overcome the brightness preservation
challenge. Contrast enhancement using brightness pr
eserving bihistogram equalization (BBHE) and
Dualistic sub image histogram equalization (DSIHE)
which divides the image histogram into two parts
based on the input mean and median respectively the
n equalizes each sub histogram independently. This
paper provides review of different popular histogra
m equalization techniques and experimental study ba
sed
on the absolute mean brightness error (AMBE), peak
signal to noise ratio (PSNR), Structure similarity
index
(SSI) and Entropy.
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