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Inquiry about standard deviations #15

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Rubiel1 opened this issue Jun 26, 2020 · 1 comment

Rubiel1 commented Jun 26, 2020 •

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Based on the wiki and the paper to compute contrast you need $sigma_x*sigma_y$.

In this line you are using $sigma_{12} = F.conv2d(img1 * img2, window, padding=padd, groups=channel) - mu1_mu2$ instead of $sigma_x*sigma_y$.

$sigma_{12}=E(X*Y)-E(X)E(Y)$ while $sigma_x * sigma_y = [ E( X-(E(X) )^2 ) *E(Y- (E(Y))^2 ) ]^{.5}$.

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Rubiel1 commented Jun 26, 2020

Oh you actually uses c*s, not only c:
My bad!

Rubiel1 closed this as completed

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