how to get SNR for 2 images

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

Answer 1

[Kye Taylor]

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'))

[Rawan hamdi]

Thank you. suppose i have 3 images now and i want to compare between their snr X0 is the original image,X is the noisy image and XX is the denoised image how can i do that?

[Kye Taylor]

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]

i'm sorry im new to matlab but how can i define this function?