圖像PSNR值及MSE值的計算

% 圖像峯值信噪比PSNR、均方根誤差MSE
% By lyqmath
% Xidian University 
function [PSNR, MSE] = psnr(X, Y)
% 計算峯值信噪比PSNR、均方根誤差MSE
% 如果輸入Y爲空，則視爲X與其本身來計算PSNR、MSE

if nargin<2
    D = X;
else
    if any(size(X)~=size(Y))
        error('The input size is not equal to each other!');
    end
    D = X-Y;
end
MSE = sum(D(:).*D(:))/prod(size(X));
PSNR = 10*log10(255^2/MSE);

最後使用的時候注意把X,Y轉換成double值...