The integer wavelet codec, and Re: [vorbis-dev] A different take at video encoding - I'm stuck though

Holger Waechtler hwaechtler at users.sourceforge.net
Mon Feb 12 11:19:10 PST 2001



This one I forgot:

On Sun, 11 Feb 2001, Kenneth Arnold wrote:

> Also, as an implementation question, what are you doing with "scales"?

cales is the number of required transforms to achieve a 1-pixel lowpass
image. You can imagine every scale as a frequency band: the highest scale
with most coefficients saves the highpass coefficients, the lowest the DC
component of the image.

Since we handle odd lengths of the xformed pixels in __fwd_xform__ and
__inv_xform__, the whole image can have arbitrary extensions.

- Holger

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