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

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Yasser Elhouderi
Yasser Elhouderi 2015-6-29
编辑： Yasser Elhouderi 2015-6-29
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.

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Image Analyst
Image Analyst 2015-6-29
What's wrong with simply using var()?
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Yasser Elhouderi
Yasser Elhouderi 2015-6-29
编辑：Yasser Elhouderi 2015-6-29
Thanks Image Analyst, but it is mandatory to use histogram to calculate the variance "in the question that I have"

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