How can I calculate the PSNR of two images in matlab? The images are obtained as intermediate results. How can I use these images to calculate the PSNR value

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D Joseph
D Joseph 2015-8-17
评论： D Joseph 2015-8-20
How can I calculate the PSNR of two images in matlab? The images are obtained as intermediate results. How can I use these images to calculate the PSNR value

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Walter Roberson
Walter Roberson 2015-8-18
http://www.mathworks.com/help/images/ref/psnr.html
Yes, PSNR can be negative. It is 10 * log10() of a ratio, so if the ratio is less than 1 then log10() is negative and so the PSNR would be negative.
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Walter Roberson
Walter Roberson 2015-8-18
nI and I would have to be double() for that to work -- or rather, they could not be uint8() or any other unsigned class.
I = double(YourImage);
for K = 1 : 20
nI = I + randn(size(I)) * 1.2345*K;
ps(K) = 10*log10(255*255/mean2((nI-I).^2));
end
plot(ps);

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