[XviD-devel] Anime and medium noise material prefilter

[Christoph Lampert <chl@xxxxxxxxxxxxxxxx>]

Hi,

I was testing with a prefilter mode that tries to reduce the encoding of
pure noise in otherwise non-changing material blocks. It's similar to the 
"zero frames" discussed earlier, but it works on 8x8 block level and uses 
DCT to detect identical blocks.

My first version is the attached modified  encoder.c

Actually the changes are just a couple of lines, marked by 

/* Here the modified bit starts */
...
/* Here the modified bit ends */

but I was too lazy to create a real patch and most Windows users might 
not know what to do with it, anyway. 

You have to compile with 

_DEBUG_PSNR
and
_SOURCESKIP

otherwise nothing will happen.  So please test, in particular with
Cartoon/Anime etc. or with "real life" material that has static
background, but a little bit of noise. 

Yes, it's slower, and don't expect PSNR to get better, this is very
unlikely. 
But the _visual impression_ should be better... whatever that means. 

Have fun and tell me the results,

Christoph

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encoder-sourceskip.zip
Description: Zip archive