[FFmpeg-devel] [PATCH] Function to parse Dirac sequence header
Sat Nov 8 19:07:44 CET 2008
wOn Sat, Nov 08, 2008 at 05:10:46PM +0200, Kostya wrote:
> On Sat, Nov 08, 2008 at 03:07:47PM +0100, Michael Niedermayer wrote:
> > On Sat, Nov 08, 2008 at 07:57:43AM +0200, Kostya wrote:
> > > On Fri, Nov 07, 2008 at 11:35:59PM +0100, Michael Niedermayer wrote:
> > > > On Thu, Nov 06, 2008 at 02:42:13PM +0200, Kostya wrote:
> > > in Elias Delta codes exponent is coded with Elias Gamma itself, but
> > > in Golomb codes mantis bits have fixed length - N or N-1.
> > >
> > > So, while unary codes and Rice codes are a specific case of Golomb codes
> > > (with code parameter 0 or 2^n correspondingly), Elias Gamma code cannot
> > > be obtained from them.
> > > Why not call _any_ 8x8 transform DCT then?
> > because "any 8x8 transform" is not neccessarily a DCT
> > exp golomb codes are described in
> > J. Teuhola, "A Compression Method for Clustered Bit-Vectors",
> > Information Processing Letters, Vol. 7, pp. 308-311, Oct. 1978.
> > from what i could find out.
> Do you have that paper?
i just have VCEG-O18.doc which points to it (google will find that one)
> Since I have long standing interest in general data compression
> (well, since 1999 is quite long for me) and I've never seen "exponential-Golomb"
> codes mentioned in any book or paper on data compression covering
> more exotic codes, and the only mentions of exp-Golomb are related
> to H.264 (and it's missing in older H.264 draft). All this makes
> me feel this name was invented by them.
even if true, i must say "exponential golomb" makes sense to me while
3 dozen different codes identified just by the author names do not.
Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB
Complexity theory is the science of finding the exact solution to an
approximation. Benchmarking OTOH is finding an approximation of the exact
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