计算图像峰值信噪比img=H;%原图像[hw]=size(img);imgn=a2;%去噪后图像B=8;MAX=2^B-1;MES=sum(sum((img-imgn).^2))/(h*w);PSNR1=20*log10(MAX/sqrt(MES))img=H;[hw]=size(img);imgn=X;B=8;MAX=2^B-1;MES=sum(sum((img-imgn).^2))/(h*w);PSNR2=20*log10(MAX/sqrt(MES))