NHW Image codec

Hello,

I don't have advanced (and worked) on the NHW codec recently.I however
compiled the codec with gcc -O3 setting (the binaries are available from my
demo page: http://nhwcodec.blogspot.com ) and just with this optimization
(no mmx, sse, avx instructions,... ) the NHW codec is 6x faster to encode
and 4x faster to decode than WebP.As I state that my codec is royalty-free,
fast with more neatness, these are good speed numbers.

For the neatness, I didn't find a good algorithm to make a neatness
measurement, so the neatness review is still at visual evaluation for now...

For the royalty/patent-free aspect, I remember that I had few months ago
this answer from Ralph Giles: "Open source and royalty-free video codec
development are
definitely on-topic for this list." Can this answer mean that I could have
a kind of "guarantee" from Xiph that the NHW codec is royalty-free? Also, I
think there are new processings in the NHW codec, would it be better that I
patent them? Or can I let it unpatented and open-source?

Any feedback is welcome.

Cheers,
Raphael

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