how to get relative entropy thresholding for an image ?

to get the only the red lesions from retinal image by subtracting the relative entropy thresholded image from tophat transformation of the same image

what is operation of entropy filter in image processing?

can i get the formula for relative entropy thresholding

Answer 1

[Peter Eze]

Rentropy= sum(sum(X.*log(X./Y))); X and Y are either distributions or vector data from a distribution.