[theora-dev] What sort of math i required?

David Kuehling dvdkhlng at gmx.de
Thu Dec 11 07:31:41 PST 2003

>>>>> "Christoph" == Christoph Lampert <chl at math.uni-bonn.de> writes:

> the (main) problem with wavelet based codecs is that wavelets aren't
> localized in the image space, so you cannot just use the very
> successful block-based motion estimation as for all DCT-based codecs.

I actually do not know much about all this but why shouldn't a simple
wavlet-based codec be based on blocks?  What I've seen so far was an
example using 8x8 wavlets gained via PCA.  Isn't DCT just a special case
of a wavelet transform with the advantage of high speeds due to
symmetries that allow speed optimizations analogous to FFT?

GnuPG public key: http://user.cs.tu-berlin.de/~dvdkhlng/dk.gpg
Fingerprint: B17A DC95 D293 657B 4205  D016 7DEF 5323 C174 7D40

--- >8 ----
List archives:  http://www.xiph.org/archives/
Ogg project homepage: http://www.xiph.org/ogg/
To unsubscribe from this list, send a message to 'theora-dev-request at xiph.org'
containing only the word 'unsubscribe' in the body.  No subject is needed.
Unsubscribe messages sent to the list will be ignored/filtered.

More information about the Theora-dev mailing list