Difference between results of SNR

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itai
itai 2014-2-27
Hi,
I want to measurement the SNR of imaging system. I have a image of the system that contains edge target (half image black and half white) and i don't know the signal and the noise in the image. I calculate the SNR by calculate the mean and the standard deviation of the white part and i divided the mean result in the standard deviation result.
meanWhiteGL = mean2(whitePartOfImage); stdWhiteGL = std(double(whitePartOfImage(:))); SNRWhite = meanWhiteGL / stdWhiteGL;
I did the same to the black part of the image. But the result of the white part was 61 and the result of the black part was 1.5, how cann i know which SNR is correct?
please help me, Itai

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