<div dir="ltr">Hi Monty,<div><br></div><div>Thank you very much for your answer!</div><div><br></div><div>> <span style="font-size:12.8px">Well, if you want to pursue a collaborative project, you need to</span></div><span style="font-size:12.8px">attract others to work on it. Perhaps 'demo' is the wrong word... I'd</span><br style="font-size:12.8px"><span style="font-size:12.8px">say the project needs to have a story, and a demonstration of the</span><br style="font-size:12.8px"><span style="font-size:12.8px">technology is part of what makes the story concrete.</span><div><span style="font-size:12.8px"><br></span></div><div><span style="font-size:12.8px">I have actually huge difficulties to attract other people to work on the NHW Project... In fact there is currently just one highly skilled researcher from IIT Bombay that gives little of his time to the study of directional wavelet transforms and their implementation in a codec such as NHW.Yes I will have to make a demonstation of the technology, but I am not really skilled in making web page demos with meaningful and well-made graphs, animations,... I fear that my demos will be rather mean and not really attractive, and finally deserve the project.</span></div><div><span style="font-size:12.8px"><br></span></div><div><span style="font-size:12.8px">> </span><span style="font-size:12.8px">You should </span><span style="font-size:12.8px">have a good idea of the complexity bounds</span></div><div><span style="font-size:12.8px"><br></span></div><div><span style="font-size:12.8px">For example, a comparison of the totally unoptimized NHW codec with the extremely optimized x264 intra: NHW is 3x times faster to encode and 1.2x time faster to decode than x264.</span></div><div><span style="font-size:12.8px"><br></span></div><div><span style="font-size:12.8px">> </span><span style="font-size:12.8px">All these things have been done before...</span></div><div><span style="font-size:12.8px"><br></span></div><div><span style="font-size:12.8px">Well, I was very sincere when I said that I tought they were innovations... For my fast DWT implementation (I did it in Feb 2007), I never saw such one in the litterature and on the Internet... it's the same for at least 2 of the 3 entropy coding schemes... But apparently I was wrong, could you give me reference to prior art.</span></div><div><span style="font-size:12.8px"><br></span></div><div><span class="gmail-im" style="font-size:12.8px">>> Monty told me :"If you don't have access to web space you can use for<br>>> documenting and advertising the project, we can certainly offer that."<br><br></span><span style="font-size:12.8px">>Absolutely.</span><span style="font-size:12.8px"><br></span></div><div><span style="font-size:12.8px"><br></span></div><div><span style="font-size:12.8px">How can this materialize? Will the web space be Xiph.org entitled?</span></div><div><span style="font-size:12.8px"><br></span></div><div><span style="font-size:12.8px">So I will try to make a demonstration of the NHW project technology to attract interest.Do you have advice Monty, software for graphs,... (because your demo pages are awesome!)?</span></div><div><span style="font-size:12.8px"><br></span></div><div><span style="font-size:12.8px">Many thanks again!</span></div><div><span style="font-size:12.8px">Cheers,</span></div><div><span style="font-size:12.8px">Raphael</span></div></div><div class="gmail_extra"><br><div class="gmail_quote">2017-08-30 10:16 GMT+02:00 <span dir="ltr"><<a href="mailto:xiphmont@xiph.org" target="_blank">xiphmont@xiph.org</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi Raphael,<br>
<span class=""><br>
On Fri, Aug 25, 2017 at 2:30 PM, Raphael Canut <<a href="mailto:nhwcodec@gmail.com">nhwcodec@gmail.com</a>> wrote:<br>
<br>
> I'll see what Monty will do on his side (and when he has time), but he also<br>
> told me that the NHW codec has merits but there must be an effort to<br>
> demonstrate them.<br>
<br>
</span>Well, if you want to pursue a collaborative project, you need to<br>
attract others to work on it. Perhaps 'demo' is the wrong word... I'd<br>
say the project needs to have a story, and a demonstration of the<br>
technology is part of what makes the story concrete.<br>
<span class=""><br>
> But it is not so evident to demonstrate them, because the NHW codec performs<br>
> bad on all metrics because it modifies image to give it more neatness (this<br>
> also includes a slight denoising)... For speed, the NHW codec is written in<br>
> plain C code, there are no C optimization, no SIMD optimization, no<br>
> multithreading, whereas the other codecs (x265,VP9,x264,WebP,...) have them<br>
> and are highly optimized, so time/speed comparison will not be fair...<br>
<br>
</span>Optimization at this stage of development is misplaced. You should<br>
have a good idea of the complexity bounds-- this is what other<br>
engineers care about-- but so long as you can demonstrate that your<br>
approach does something unique and useful in a way that draws<br>
interest, that's what you need.<br>
<span class=""><br>
> Then there are innovations in the NHW codec: like a new fast wavelet<br>
> transform, a multistage residual coding, 3 new entropy coding schemes and<br>
> other things like for example interesting pre- and post- processing based on<br>
> a laplacian kernel, a feedback correction,etc...<br>
<br>
</span>All these things have been done before... how are your approaches<br>
unique? What references do your versions draw from? Build on? One<br>
reason to be familiar with (and use the language) of the state of the<br>
art is to provide a shared context and terminology in which others can<br>
understand what you're doing.<br>
<span class=""><br>
> Monty told me :"If you don't have access to web space you can use for<br>
> documenting and advertising the project, we can certainly offer that."<br>
<br>
</span>Absolutely.<br>
<span class=""><br>
> Are you interested in documentation of the innovations of the NHW codec? As<br>
> I am still very busy (but this will change), do some of you would like to<br>
> make these demonstrations?<br>
><br>
> So to finish, I think it's a great deal that Xiph.org proposes!!!, if you<br>
> want more of this collaboration, want to help in the development,<br>
> documentation, demonstration of the NHW Project, do not hesitate to show up<br>
> on the forum.<br>
><br>
> Many thanks again to Xiph!, hope this will materialize in the next months.<br>
<br>
</span>Good wishes to you too!<br>
<br>
Cheers,<br>
Monty<br>
<br>
><br>
> Cheers,<br>
> Raphael<br>
><br>
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><br>
</blockquote></div><br></div>