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Finding the histogram of an image

Okay, on the last post I've said what is an histogram. Now let's do a simple example on MATLAB to understand the concept. We will be using some well known Images for our exercises. "Lena", "Barbara", "Baboon" are some.

For finding the histogram I'm providing two programs.

One returns the histogram as output.
histogram.m
One returns three graphs of three different images to look the difference.
histrogram3.m

#TRASHCODERS
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