Displaying 20 results from an estimated 2000 matches similar to: "NHW Project - website, demo pages, algorithms dev,..."
2018 Mar 09
0
NHW Project - lower quality settings
Hello,
I have re-tested -l4 high compression setting and it's clear that it lacks
of precision on degraded, rather blurred images. So I don't know if it is a
good idea to base the other lower quality settings (-l5,-l6,...) on -l4
setting.I have tested the NHW codec against x265, x264, Daala, WebP,
Rududu, DLI and it's clear that at high compression these very good codecs
have more
2018 Mar 10
0
NHW Project - lower quality settings
I don't mind at all. I imagine there are more people like me out
there who have been following your work, but haven't said anything.
I agree that a series of pages explaining how things work may lead to
more contributions. At the very least it would lead to more people
being better educated on how wavelets work in image compression. But,
this is your project, if you don't have the
2017 Oct 23
0
NHW Project - neatness metrics
Hello all,
Finally find some time to get back to the NHW Project.I was thinking about
making a technology demo, and I wanted to highlight the uniqueness of the
NHW codec that is neatness/sharpness preserving or enhancement.With my
eyes, I can see that the NHW codec has more neatness/sharpness than the
other codecs (x265, x264, WebP, Rududu, JPEG,...), but for a demo there
must be objective
2018 Mar 10
2
NHW Project - lower quality settings
Hi David!
Many thanks for your very encouraging and kind feedback!!! (Hope you don't
mind that I made your post public on the Theora channel).
I try to be the more sincere as I can in my posts.Some people suggested me
to make demo pages to explain how the codec works step by step, and I
realize that it would be good, because certainly it will show that the NHW
codec is not that complex and
2018 May 28
0
NHW Project - high compression & community
Hello,
I've found some time to get back to the NHW Project.In fact a Xiph forum
member told me that even if I will start a new job, he hopes that I will
still continue to develop a little the NHW Project, on my spare time.I told
him that I would furthermore spend my spare time on the NHW Project if a
community around the project could emerge... and he told me that certainly
the best way for
2018 Dec 10
0
NHW Project - good improvement of very high compression (-l8 to -l13 quality settings)
Hello,
Just a quick message to let you know that I have really improved very high
compression of the NHW Project
from -l8 to -l13 quality settings, and we can still save 2.5KB per .nhw
compressed file.
Actually I am new to very high compression, it is just 3 months that I am
working on it (I put on pause the NHW Project from August 2013 to February
2018 )... And I realize that very high
2017 May 02
0
NHW Project and wavelet codecs
Hello,
In my last post, I seemed to say that there were no directional wavelet
transforms that would give improvement to the NHW codec, but are
directional wavelets an active research field today? I have also seen some
recent patents on advanced and improved SPIHT, and I am a little surprised
that there is no "up-to-date" state-of-the-art wavelet codec.Rududu in
April 2008 was the last
2016 Oct 01
0
NHW codec
Hello,
I would like to discuss a little about the NHW codec and its state after
nearly 5 years on the Xiph forums.
I also know that if I would like to discuss I'd better go to the great
Doom9 and Encode.ru forums but for now I find that my codec is too
experimental for these professional forums:
- the codec is only for fixed 512x512 size, just a test tool.
- there is only mid compression
-
2017 Aug 30
0
NHW Project - news with Xiph.org
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'
2018 Mar 28
0
NHW Project - high compression (-l6 setting and below)
Hello,
I would like to thank very much the Theora channel community for their
support and help!!! And even recently a Theora channel member proposed me
to freely host on his server the NHW Project website, to present the codec
on the embedded processors, MCU forums that he knows well, another member
forked my GitHub repository!!! Really thank you very much!!!
It makes me think that maybe the NHW
2017 May 27
0
NHW Codec - aliasing
Hello,
I have just tested new next lower quality settings (-l3 and -l4), I can
diminish residual coding but if I increase wavelet coeffs threshold there
is more aliasing.And even in the current mid quality settings there is some
aliasing, this is the big drawback of the NHW codec.
SPIHT algorithm is good for that as for example Rududu codec doesn't have
aliasing at all at mid compression and
2017 Aug 25
4
NHW Project - news with Xiph.org
Hello,
These last 2 months, I have talked again with Monty Montgomery about the
NHW Project and he told me that Xiph.org would like to encourage the NHW
Project development.That's just great!
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.
The advantages, merits of the NHW
2017 Sep 04
0
NHW Project - fast discrete wavelet transform
Hello,
I forgot in my last reply that my DWT implementation can be speed up, for
example I'm doing for now:
for (;_X1<_E_;_X1++,_RES+=2) //dilatation
{
_RES[0]=_X1[0]<<3;
_RES[1]=(_X1[1]+_X1[0])<<2;
}
then
for (;_X2<_E_;_X2++,_RES+=2) //details
{
_RES[0]-=(_X2[1]+_X2[0])<<1;
_RES[1]+=6*_X2[1]-_X2[2]-_X2[0];
2018 Mar 28
0
NHW Project - high compression (-l6 setting and below)
Hello Ken,
Many thanks for your reply!
Yes, I very need to adapt the NHW codec to any image size.But actually it
is the least interesting part, I don't think that it is that difficult
(compared to creating high compression settings) but it is very boring,
annoying... Really not the part that I prefer... For now, as I am jobless,
my aim is to have "pleasure" with the NHW Project and
2018 Mar 30
0
NHW Project - high compression (-l6 setting and below)
Hello Spork,
> If you want though, when I find some time, I can work on supporting a
better command line parsing.
Yes that would be great as my command line parsing is not good at all.
> Does your codec compile under Linux? If not, that's something I can try
to work on as well.
I never tested my codec under Linux )-:, and so it would be also great to
compile it under Linux.I think
2013 Aug 28
0
NHW Image codec - Compression Performance
Hello,
Definitely not any (constructive) comments on the NHW Image codec?
According to my tests, it can compare good with reference codecs like
x264 intra and WebP.
Yes, the codec is still experimental and is optimized for visual
(subjective) evaluation, not PSNR.Its main feature is again that it would
have a little more neatness/sharpness and a little less precision (residual
coding is applied
2017 Mar 07
0
NHW Codec - some progress
Hello,
I have some progress for the NHW codec.
I recently talked with a researcher that has some interest in the NHW
codec.He has studied several directional wavelet transforms (notably HWD
directional transform), and he came to the conclusion that directional
transforms will bring marginal improvement, not significant in the case of
my compression codec.This also confirms what I have read from
2018 Aug 04
0
NHW Project - Image comparison
Hello,
Could some of you take a look at the image comparison between the NHW
Project and x265 (HEVC) at high compression, available here:
http://nhwcodec.blogspot.com/ .
I would be very very interested in your opinion, and it would help me to
perfect the NHW Project.For me the NHW Project has more neatness, and x265
has more precision.
Else, I was a little lazy these past months, as I
2018 Dec 11
0
NHW Project - speed measurement 2 - very high compression
Hello,
If it could be of interest, here are new speed measurement for -l13 very
high compression setting.
For x265 (HEVC), I use BPG codec, and this time I use -m 0 setting which
uses the fastest encoding setting of x265.I run the .exe 10x times and I
pick the best scores.
So here are the timings at -l13 very high compression:
Encode time: x265 (BPG -m 0): 80ms NHW: 20ms
Decode time: x265
2017 Nov 30
0
Fwd: NHW Project - speed comparison with x265
---------- Forwarded message ----------
From: Raphael Canut <nhwcodec at gmail.com>
Date: 2017-11-30 14:22 GMT+01:00
Subject: Re: [theora] NHW Project - speed comparison with x265
To: fboehm <fboehm at aon.at>
Hi Franz,
Many thanks for your answer!!!
> I appreciate your enthusiastic work on such a complex project like
writing a video codec
Yes, for now the NHW codec is more an