how to get SNR for 2 images

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Rawan hamdi
Rawan hamdi 2013-4-11
hi,
i have 2 images and i would like to get SNR between these 2 images. i have an original clean image which is X0, i added some noise to it and the noisy image is Xn

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Kye Taylor
Kye Taylor 2013-4-11
编辑：Kye Taylor 2013-4-11
You'll get different answers, depending on who you're talking to.
I would suggest using
snr = 20*log(norm(X0,'fro')/norm(X0-Xn,'fro'))
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Kye Taylor
Kye Taylor 2013-4-11
Check it....
Define a function handle to compute the SNR of images, relative to the clean image X0:
g = @(X)20*log(norm(X0,'fro')/norm(X0-X,'fro'))
Then, you can compute the SNRs of your two images like
snrOfXn = g(Xn);
snrOfXX = g(XX);
How rad is that?
The higher the SNR, the better the denoising process. In other words, if XX is denoised version of Xn, you should see snrOfXn < snrOfXX
Rawan hamdi
Rawan hamdi 2013-4-11
i'm sorry im new to matlab but how can i define this function?

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