[vorbis-dev] Ogg VEO Codec, video in an Ogg stream

[Gregory Maxwell]

You might want to look into papers on wavelet compression of MRI
volumetric datasets. Some methods should be very applicable to video
compression, also beware patents from the same field.

In my past play with using 3d wavelet transform coding on video, I found
that unacceptible temporal smear was very common on video transitions
(think about it, a small smear a few pixels wide with exponential falloff
is fine (esp on continous tone images), but a few frames deep?), and that
a window switching method would probably make sence to keep very differnt
images in differnt blocks.

On Wed, 30 Aug 2000, Taral wrote:

> On 30 Aug, Jack Moffitt wrote:
> >> Why not use SETs on non 2^x-sized blocks?
> > 
> > What is a SET? :)
> 
> Symmetric Extension Transform. Basically uses certain properties of the
> wavelet to enable you to extend the block to 2^x, then chop off a
> certain amount of the wavelet-transformed data, resulting in a
> non-expansive wavelet transform for non-2^x block sizes.
> 
> I'll see if I can't dig up the paper.
> 
> 

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