how to calculate the contrast improvement index for a color image 256*256*3

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sachit
sachit on 9 Jan 2015
Commented: ElleAlba on 31 Oct 2017
CII= Cproposed/ Corignal. where C is the average value of low contrast measured with 3*3 window as max-min/max+min
i have the matrix of original image as 256*256*3, and same for proposed image. now how can i calculate the CII

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