he function equalizes the histogram of the input image using the following
 algorithm:
Calculate the histogram of the image.
Normalize the histogram so that the sum of histogram bins is 255.
Compute the integral of the histogram.
Transform the image using the integral of the histogram as a look-up
   table.

"><meta property="og:description" content="histEq performs the histogram equalization of an image.
 The function equalizes the histogram of the input image using the following
 algorithm:
Calculate the 