[EMAIL PROTECTED] wrote:
G'day all.
Andrew Coppin wrote:
Actually, LZW works surprisingly well for such a trivial little
algorithm... When you compare it to the complexity of an arithmetic
coder driven by a high-order adaptive PPM model (theoretically the best
general-purpose algorithm that exists), it's amazing that anything so
simple as LZW should work at all!
Not really. LZW is basically PPM with a static (and flat!) frequency
prediction model. The contexts are build in a very similar way.
Yes - but making it use a non-flat model opens a whole Pandora's Box of
fiddly programming. ;-)
(It's not "hard" as such - just frustratingly fiddly to get correct...)
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