that actual snr is

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vipul utsav
vipul utsav 2012-12-29
one person say me that actual snr is,,,
if noiseImage=noisyImage-originalImage then actual snr=mean(originalImage./abs(noiseImage)) so my question is that "Is snr depends on mean and variance of noiseImage"?

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Image Analyst
Image Analyst 2012-12-29
Yes. More noise = lower SNR, and less noise = higher SNR.
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Image Analyst
Image Analyst 2012-12-29
Because the absolute value of the noise image is being taken, the std dev affects the mean. You could have a mean of zero in the original noise, but once you take the abs(), now the mean depends on the std dev. So the SNR of an image with noise = 0 +/- 5 gray levels will be higher than the SNR of the same image with a noise of 0 +/- 200 gray levels.
Walter Roberson
Walter Roberson 2012-12-29
Good point.

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