[theora] NHW Project - news with Xiph.org

xiphmont at xiph.org xiphmont at xiph.org
Wed Aug 30 08:16:02 UTC 2017

Hi Raphael,

On Fri, Aug 25, 2017 at 2:30 PM, Raphael Canut <nhwcodec at gmail.com> wrote:

> I'll see what Monty will do on his side (and when he has time), but he also
> told me that the NHW codec has merits but there must be an effort to
> demonstrate them.

Well, if you want to pursue a collaborative project, you need to
attract others to work on it.  Perhaps 'demo' is the wrong word... I'd
say the project needs to have a story, and a demonstration of the
technology is part of what makes the story concrete.

> But it is not so evident to demonstrate them, because the NHW codec performs
> bad on all metrics because it modifies image to give it more neatness (this
> also includes a slight denoising)... For speed, the NHW codec is written in
> plain C code, there are no C optimization, no SIMD optimization, no
> multithreading, whereas the other codecs (x265,VP9,x264,WebP,...) have them
> and are highly optimized, so time/speed comparison will not be fair...

Optimization at this stage of development is misplaced.  You should
have a good idea of the complexity bounds-- this is what other
engineers care about-- but so long as you can demonstrate that your
approach does something unique and useful in a way that draws
interest, that's what you need.

> Then there are innovations in the NHW codec: like a new fast wavelet
> transform, a multistage residual coding, 3 new entropy coding schemes and
> other things like for example interesting pre- and post- processing based on
> a laplacian kernel, a feedback correction,etc...

All these things have been done before... how are your approaches
unique?  What references do your versions draw from?  Build on?  One
reason to be familiar with (and use the language) of the state of the
art is to provide a shared context and terminology in which others can
understand what you're doing.

> Monty told me :"If you don't have access to web space you can use for
> documenting and advertising the project, we can certainly offer that."


> Are you interested in documentation of the innovations of the NHW codec? As
> I am still very busy (but this will change), do some of you would like to
> make these demonstrations?
> So to finish, I think it's a great deal that Xiph.org proposes!!!, if you
> want more of this collaboration, want to help in the development,
> documentation, demonstration of the NHW Project, do not hesitate to show up
> on the forum.
> Many thanks again to Xiph!, hope this will materialize in the next months.

Good wishes to you too!


> Cheers,
> Raphael
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