MATLAB实现图像质量评估标准SSIM 程序源码.zip

function [ StrSim ] = SSIM(a,b) %SSIM Implementation of the similarity comparision in SSIM %-------------------------------------------------------------------------- % Input: intensity image a and b; patch size w. % Output: struction similarity StrSim. %-------------------------------------------------------------------------- % Details can be found in the authors' original paper: % Z.Wang, A.Bovik, H.Sheikh and E.Simoncelli, "Image quality assessment: % From error visibility to structural similarity," IEEE Transactions on % Image Processing, vol. 13, no. 4, pp. 600-612, Apr. 2004. %-------------------------------------------------------------------------- c = 2e-4; %small constant w = 8; %patch size h =fspecial('average',[w,w]); h = h/sum(sum(h)); mu1 = filter2(h, a, 'valid'); mu2 = filter2(h, b, 'valid'); mu1_sq = mu1.*mu1; mu2_sq = mu2.*mu2; mu1_mu2 = mu1.*mu2; sigma1_sq = filter2(h, a.*a, 'valid') - mu1_sq; sigma2_sq = filter2(h, b.*b, 'valid') - mu2_sq; sigma12 = filter2(h, a.*b, 'valid') - mu1_mu2; StrSim = (sigma12 + c)./(sqrt(sigma1_sq.*sigma2_sq)+c);