Do variance get increased by increasing SNR?

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Benitta glara
Benitta glara el 9 de Mayo de 2013
I have added SNR of 20 to an image using the below formula of variance
SNR = [var(image)/var(noise)]
var(noise)=var(image)/SNR
in matlab code...
v = var(I(:)) / 10;% SNR=10
I_noisy = imnoise(I, 'gaussian', 0, v);
Is it correct?...

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Image Analyst
Image Analyst el 9 de Mayo de 2013
No, it's not. Well maybe it might be close if your image was 100% noise and no signal. Otherwise there is no basis for your assumption that the noise is the same as the variance of the image.

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