pow(sum(SSIM)) != sum(pow(SSIM))

[skal65535]

Hi,

i noticed a difference with the Simoncelli & al paper in the implementation, at line:

ssim/ssim/ssimIndex.cpp

Line 205 in 7d9d1b3

result *= pow(thissim,Weights[scale-1]);

The MSSIM score is computed as the weighted product of individual scaled image's score, whereas equation (7) in the paper would indicate that it should be done at the per-pixel level.

just fyi
skal/

[thorfdbg]

You probably misunderstand something. In the MSSIM-paper, x and y are not image positions. They are images (thus in bold, vectors).