?? psnr.m
字號:
%Name: Chris Shoemaker
%Course: EER-280 - Digital Watermarking
%Project: Calculates the PSNR (Peak Signal to Noise Ratio)
% of images A and A', both of size MxN
function [A] = psnr(image,image_prime,M,N)
% convert to doubles
image=double(image);
image_prime=double(image_prime);
% avoid divide by zero nastiness
if ((sum(sum(image-image_prime))) == 0)
error('Input vectors must not be identical')
else
psnr_num=M*N*max(max(image.^2)); % calculate numerator
psnr_den=sum(sum((image-image_prime).^2)); % calculate denominator
A=psnr_num/psnr_den; % calculate PSNR
end
return
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