[問題] 請教影像的PSNR計算已回收
各位前輩好
我想找出JPEG影像的PSNR
可是我的算出來跟別人的比較後卻發現差很多
想請各位高手幫忙看看是哪裡出錯了
感謝
PS:
影像是拿這裡的圖來算的
http://scien.stanford.edu/class/psych221/projects/06/itai/LSB.html
Original image & 6-bit distortion
他算出Y的psnr是:19.89
我卻是29.6398
程式如下:
clear all;
oYUV = imread('lena_0.jpg');
cYUV = imread('lena_6.jpg');
[height,width,depth] = size(oYUV);
difY = sum(sum((double(oYUV(:,:,2))-double(cYUV(:,:,2))).^2))/(height*width);
difU = sum(sum((double(oYUV(:,:,2))-double(cYUV(:,:,2))).^2))/(height*width);
difV = sum(sum((double(oYUV(:,:,3))-double(cYUV(:,:,3))).^2))/(height*width);
snrY = 10.0 * log10 ( (255)^2 / difY )
snrU = 10.0 * log10 ( (255)^2 / difU )
snrV = 10.0 * log10 ( (255)^2 / difV )
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