[MPlayer-cvslog] CVS: main/libmpcodecs vf_pp7.c, NONE, 1.1 vf.c, 1.115, 1.116 Makefile, 1.144, 1.145

[Michael Niedermayer]

Hi

On Monday 25 July 2005 20:49, Diego Biurrun wrote:
> On Sat, Jul 09, 2005 at 09:49:53AM +0200, Michael Niedermayer CVS wrote:
> > Added Files:
> > 	vf_pp7.c
> > Log Message:
> > pp7 filter (spp=6 filter with 7 point dct where only the center sample is
> > used after idct) these differences from spp lead to a few nice symmetries
> > which significantly reduce the computational cost
>
> Michael, is this a correct description of your filter?

probably


>
>   pp7[=qp[:mode]]
>     Variant of the spp filter, similar to spp=6 with 7 point DCT where
>     only the center sample is used after IDCT.
>
>     <qp>
>       Force quantization parameter (default: 0, use QP from video).
>
>     <mode>
>       0: hard thresholding
>       1: soft thresholding (better deringing, but blurrier)
>       2: medium thresholding (default)
>
> Maybe you can fill in a comment about medium thresholding..

hmm 2. looked better then the others in my very limited tests :)

heres some technical description of what all 3 do with the dct coefficients

no     thresholding: 9 8 7 6 5 4 3 2 1 0
hard   thresholding: 9 8 7 6 5 4 0 0 0 0 
soft   thresholding: 6 5 4 3 2 1 0 0 0 0
medium thresholding: 9 8 7 6 4 2 0 0 0 0

[...]
-- 
Michael