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

[Diego Biurrun]

On Mon, Feb 27, 2006 at 05:18:01AM -0800, Roman Shaposhnik wrote:
> On Sat, Feb 25, 2006 at 09:59:32PM +0100, Christian Iversen wrote:
> > On Saturday 25 February 2006 21:18, Dan Maas wrote:
> > > The attached (very small) patch improves image quality from ffmpeg's
> > > DV encoder, increasing PSNR by about 3dB on the BBC's test footage.
> > 
> > Not at all commenting on the quality of the patch in question (which is 
> > probably great), when are "we" (meaning "you" :-) going to stop using PSNR as 
> > a quality measure? There is only a quite weak correlation between percieved 
> > image quality and PSNR. 
> 
>   This makes me wonder -- do "we" know know of any real alternative ? Or
>   better yet, is anyone aware of any sort of research in this area ?

This has been discussed here not long ago.  An alternative that promises
much better correlation between a number and the perceived image quality
is the Universal Image Quality Index:

http://www.cns.nyu.edu/~zwang/files/research/quality_index/demo.html

Don't be put off by the website's garish colors, check out the example
images, they speak for themselves...

Diego