gusucode.com > 《MATLAB图像与视频处理实用案例详解》代码 > 《MATLAB图像与视频处理实用案例详解》代码/第 15 章 基于小波的图像压缩技术/PSNR.m
function S=PSNR(s,t) [m, n, ~]=size(s); s = im2uint8(mat2gray(s)); t = im2uint8(mat2gray(t)); s = double(s); t = double(t); sd = 0; mi = m*n*max(max(s.^2)); for u = 1:m for v = 1:n sd = sd+(s(u,v)-t(u,v))^2; end end if sd == 0 sd = 1; end S = mi/sd; S = 10*log10(S);