Displaying 20 results from an estimated 5000 matches similar to: "NHW Image codec - subjective quality"
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
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 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 Jul 10
1
NHW Project - some update
You're welcome!
On Tue, Jul 10, 2018, 4:50 AM Raphael Canut <nhwcodec at gmail.com> wrote:
> Hello Dave,
>
> Thank you very much for your help!
>
> Cheers,
> Raphael
>
> 2018-07-10 9:39 GMT+02:00 Dave Johnson Games <davefilms.us at gmail.com>:
>
>> Let me do some looking.
>>
>> On Mon, Jul 9, 2018, 4:55 PM Raphael Canut <nhwcodec at
2018 Jul 10
0
NHW Project - some update
Hello Dave,
Thank you very much for your help!
Cheers,
Raphael
2018-07-10 9:39 GMT+02:00 Dave Johnson Games <davefilms.us at gmail.com>:
> Let me do some looking.
>
> On Mon, Jul 9, 2018, 4:55 PM Raphael Canut <nhwcodec at gmail.com> wrote:
>
>> Hello Dave!
>>
>> Thank you very much for your answer!
>>
>> You're right.I have thought
2018 Jul 09
0
NHW Project - some update
I think Apple is somehow "attached" to the MPEG group. They control the
"pools" too. Your codec sounds great. Google could -- if they wanted to --
use it but they have Web^M and webP. Look to Asia. Asus has just launched a
new phone. ??
On Mon, Jul 9, 2018, 3:14 PM Raphael Canut <nhwcodec at gmail.com> wrote:
> Hello,
>
> I don't have advanced on the NHW
2018 Jul 09
4
NHW Project - some update
Hello,
I don't have advanced on the NHW Project this past month, but I have
definitely validated its characteristics and this new version.
The NHW Codec preserves or enhances image neatness and sharpness, which
translates that on good quality images the NHW Codec is globally better
than HEVC, and on degraded (with blur, artifacts) images it is worse than
HEVC because it lacks of precision. I
2018 Feb 18
1
NHW Project - high compression -l4 setting
Hello,
For those interested, I have added a -l4 high compression setting to the
NHW codec ( http://nhwcodec.blogspot.com/ ).This setting is very
experimental, I have boosted the sharpness for this one, but it can lack of
precision on low contrast areas.
This setting still maintains a good neatness and when it will be validated,
I will then make a new 0.1.4 version for the NHW Project.
High
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
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
2018 Dec 08
0
NHW Project - new -l13 very high compression quality setting
Hello,
I wanted to let you know that I have released a new -l13 very high
compression quality setting for the NHW Project (and we can still save
2.5KB per .nhw compressed file).
I find this -l13 quality setting very competitive (I will maybe use some of
its processing to improve -l12 setting).Compared to x265 (HEVC), I have
tested on 15 rather good quality images, and I visually prefer the
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
2013 May 29
1
NHW Image codec - 2 lower quality settings
Hello,
I have finally added 2 lower quality settings for the NHW codec: -l1 (-5Ko)
and -l2 (-10Ko).I use a quantization of 0.935 and 0.88 (kind of
quantization), and I decrease residual coding on the first order wavelet
image.
I have updated the demo page: http://nhwcodec.blogspot.com/ .
These 2 lower quality settings are still experimental.If you could find
time, would be interested in any
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
2018 Mar 11
0
NHW Project - major quality improvement for -l1->-l4 settings
Hello,
With -l5 quality setting, I have learned that I can increase wavelet coeff
threshold to 12 in the HH band without noticeable difference in the
reconstructed images.With this processing, I win in average 1Ko in the
compressed .nhw files, and so I can raise the quantization for -l1->-l4
settings (0.935->0.955,0.88->0.9,0.87->0.89) and so these settings are now
better, there is a
2013 Jun 19
0
NHW Image codec - lower quality settings
Hello,
I have improved a little the NHW codec.I have improved the dequantization
in the wavelet HH band, and little improved the -l2 (and lower) quality
setting.I have also added a -l3 lower quality setting (-15Ko, exp), I have
increased the quantization for this other setting, and I start to remove
higher wavelet coefficients, but this is not optimal... The artifacts start
to be noticeable for
2017 Oct 02
1
NHW Project - AOM AV1 comparison
Hi Silvia,
Thank you very much for your answer! Your opinion is much appreciated.
Your advice is wisdom, but very quickly to rectify or precise my situation,
I am finishing a 2-year job contract and there will maybe be a "vacation"
period before the next contract (if I find one), so I would like to invest
this time for the NHW Project, but that's right that image/video
compression,
2018 Dec 03
0
NHW Project - How to find a sponsor?
Hello,
I am still working on very high compression for the NHW Project, but I find
the current version good, it has a good neatness of image, which I find
visually more pleasant than other codecs that are optimizing for PSNR,
SSIM,... Furthermore the NHW Project is still very fast and royalty-free.
I dedicated this past year to the NHW Project and I could make very good
improvements (like
2018 Aug 17
2
NHW Project - new -l8 "very high compression" setting
Hello,
For those interested, I have added a -l8 "very high compression" setting to
the NHW Project.
I have added an experimental processing to remove details and preserve
neatness.I have also now a fast estimation of entropy of wavelet
coefficients and I use it accordingly to the image complexity but it is a
very first version... With these new processings, the entropy coding
schemes
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