Vorbis dev - Jan 2001 - Integer wavelet video codec (source and test program)

Hi everybody,

I wrote last time some code to do video compression using a 3d integer
wavelet transform. Since it uses a reversible lifting scheme and avoids a
lot of floating point operations compared to Jacks initial Tarkin code,
this should be somewhat faster and allow lossy+lossless compression.

The current implementation is very experimental, but nevertheless I would
be happy if some of you would take a look on the source available at
http://www.informatik.hu-berlin.de/~waechtle/w3d-0.1.14.tar.gz (about 9k).

Comments, ideas, help and contributions are always welcome.
Please cc me in replies, I'm not subscribed on this list.

- Holger

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Hi,

I have a question about the yuv->rgb and rgb->yuv formulas. They work
out to:

u = r - g;
v = g - b;
y = g + 1/4*r + 1/4*b;

I understand that green is generally more important than blue and red
but isn't this a bit radical?

Lourens

Holger Waechtler wrote:
> 
> Hi everybody,
> 
> I wrote last time some code to do video compression using a 3d integer
> wavelet transform. Since it uses a reversible lifting scheme and avoids a
> lot of floating point operations compared to Jacks initial Tarkin code,
> this should be somewhat faster and allow lossy+lossless compression.
> 
> The current implementation is very experimental, but nevertheless I would
> be happy if some of you would take a look on the source available at
> http://www.informatik.hu-berlin.de/~waechtle/w3d-0.1.14.tar.gz (about 9k).
> 
> Comments, ideas, help and contributions are always welcome.
> Please cc me in replies, I'm not subscribed on this list.
> 
> - Holger
--- >8 ----
List archives:  http://www.xiph.org/archives/
Ogg project homepage: http://www.xiph.org/ogg/
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