How can I calculate the variance of white noise in an image

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Assume that we have an image with an additive white noise. How can I calculate the variance of this noise using histogram? I tried to find a flat region in an image, where the variance is the minimum, and then tried many ways to calculate the variance of the white noise, but all was unsuccessful.

Answers (1)

Image Analyst
Image Analyst on 29 Jun 2015
What's wrong with simply using var()?
  1 Comment
Yasser Elhouderi
Yasser Elhouderi on 29 Jun 2015
Edited: Yasser Elhouderi on 29 Jun 2015
Thanks Image Analyst, but it is mandatory to use histogram to calculate the variance "in the question that I have"

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