[Ffmpeg-devel] [PATCH] DV image quality improvement

Rich Felker dalias
Mon Feb 27 18:05:00 CET 2006

On Sat, Feb 25, 2006 at 11:26:35PM +0100, Christian Iversen wrote:
> Having read the paper on the Universal Image Quality Index (did I get that 
> name wrong?), I've seen examples where images there were very clearly 
> completely different in quality got the exact same PSNR rating. I think it's 

Yes, I'm quite aware of it. However, if you perform those same tests,
but for each test hold the _type_ of distortion fixed and just vary
the amount of it, PSNR will correlate rather well with the visual
quality. Where PSNR particularly sucks is for comparing different
types of distortion.


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