[MPlayer-dev-eng] [LONG] PSNR comparison, new source and results

[Michael Niedermayer]

Hi

On Tuesday 15 June 2004 16:54, Michael Niedermayer wrote:
> Hi
>
> On Tuesday 15 June 2004 15:35, Jan Knutar wrote:
> > > >>a - don't use vlelim & vcelim, at least on that kind of scene at
> > > >>     that kind of bitrate
> > > >
> > > > Did it ever show a psnr gain in any of your tests? I'd be surprised
> > > > if it did.
> > >
> > > No. On the Matrix scene (2304 samples so 1152 of each),
> > > vlelim diminished the PSNR of 1151 (1 was unchanged) and
> > > vcelim diminisged the PSNT of 1150 (2 were unchanged).
> > >
> > > I won't use them again, I think :-)
> >
> > Yeah. I think vlelim and vcelim belong to the "psychovisual" enhancments
> > category, the impossible to measure kind :-)
>
> they belong to the standard committee ideas category, the idea behind them
> is IIRC that blocks which are allmost identical arent worth to be stored,
> so they work similar to our cbp option, allthough cbp should always be
> better
btw 2 other options which havent been tested much yet are ibias & pbias
note though that they dont work with trell and they dont work well with the 
default quantization+dct -> so use vfdct=6 if anyone wants to try them

[...]
-- 
Michael
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