[theora] NHW Image codec

Raphael Canut nhwcodec at gmail.com
Wed Aug 12 06:56:35 PDT 2015


For those interested, I have improved the entropy coding scheme for wavelet
coeffs compression.This scheme is now more complete, it is also faster, the
compression gain is around 50-100octets, I would have expected more..., but
it is getting harder to save bits for this part.Update at
http://nhwcodec.blogspot.com/ .

Now the discussions on video compression will be certainly focused on the
NETVC project, and that's right that beside professional codecs like Daala,
Thor, and certainly Google VP9/10, (and others...), the NHW codec has
almost no chance to be selected.But if some few parts could be selected
(for test), that would be just great.The main interesting parts of the
codec are: a new fast wavelet transform, a multistage residual coding, and
3 new entropy coding schemes which one (above) is very efficient and very
fast for quantized coefficients in video/image compression.

Do not hesitate to let me know or leave comment.

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