Re: Misc Codec Questions....

Hi,

--- Sebastien St-Laurent <[email protected]> wrote:
> Hi.
> 
> First of all, can someone confirm if the behavior i'm getting with
> the (2,2)
> wavelet is the same (i,e: No bit growth)?

You can see this by looking on the equation for the lowpass
coefficient, it's simply a truncated (or rounded) weighted average of
the neighbor coefficient e.g. (x_i + x_{i+1})/2 for the (1,1) wavelet.
There is no bit growth.


> Second question... Anybody know of any bit coding scheme that is more
> memory
> efficient and less computationally expensive than EZW or SPHIT? I
> don't
> really care of the encode time but the SPHIT architecture seems like
> it
> might be a bottleneck on the decode time also...

For this purpose a Vector Quantizer (VQ) might be the best solution.
Maybe you can reuse Vorbis' ones when you modify it to work on
integers.

Holger



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