RE: Misc Codec Questions....

Just out of curiosity, anyone has numbers as to how much people managed to
get out of an arithmetic coder on something like a SPHIT based encoded
image? I'm just currious to see how my simple context model holds up to a
full blown enthropy coder.

Sebastien St-Laurent


-----Original Message-----
From: [email protected] [mailto:[email protected]]On
Behalf Of Marco Al
Sent: Thursday, May 23, 2002 3:19 PM
To: [email protected]
Subject: Re: [tarkin-dev] Misc Codec Questions....


Segher Boessenkool wrote:
>> The author of this page has invented an alternative entropy-coder
>> which has better performance than arithmetic coding in his tests.
>
> That's very interesting, as arithmetic coding is provable optimal
> (under some conditions, of course;  Huffman coding is optimal under its
> own conditions as well, of course ;) )

Its not so much just an entropy coder, but a way of modeling is an
inherent part of the method ... its compared to with a arithmetic coder
with a "popular" "adaptive fixed context bit-based model". The
advantage of his method that despite the better modelling (shown by
the compression) the computational complexity stays relatively low.

Marco


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