Displaying 20 results from an estimated 3000 matches similar to: "NHW Project - good quality improvement & new -l14 very high compression quality setting"
2019 Feb 10
0
NHW Project - new -l18 "extreme" compression quality setting
Hello,
I have just added a new -l18 "extreme" compression quality setting to the
NHW Project.I find this quality setting very good and actually better than
x265 (HEVC).
First, I wanted to let you know that compression of the wavelet DC image is
really not efficient at extreme compression, I have the fast ideas to
improve it, and so we can really save 2.5KB per .nhw compressed files in
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 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
2018 Nov 23
0
NHW Project - improvement of very high compression
Hello,
Just a quick message to let you know that I have improved very high
compression -l8, -l9, -l10 quality settings of the NHW Project.These
settings have now more precision and still a good neatness.This new version
is then better (and we can still save 2.5KB in average per .nhw compressed
file).
More at: http://nhwcodec.blogspot.com/
As usual, any feedback is very welcome!
Cheers,
Raphael
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
2018 Mar 17
0
NHW Project - quality improvement - proper subband quantization
Hello,
I have improved quality for -l1->-l4 settings.I have properly set up the
wavelet coeff threshold of the dead-zone according to the different wavelet
subbands, I have then saved another 1Ko per .nhw files without noticeable
difference and so I have raised again the quantization.The reconstructed
images have now a better precision and still a good neatness.
Update at:
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 Dec 11
0
NHW Project - lower quality settings - high compression
Hello,
I was testing quickly some other lower quality settings -l3, -l4 because
high compression is what really lacks to the NHW codec.
In fact I can remove -5Ko of residual coding on Y,U,V comps for -l3 and I
can remove -10Ko always of residual coding for -l4, and -l3, -l4 settings
will be really better than the current ones implemented.
I can also increase the wavelet coefficients threshold
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
2018 Aug 22
0
NHW Project - very high compression settings
Hello,
I think I have nearly validated the -l8 "very high compression" setting, I
have started to work on -l9 setting, and I have just tested these ones
against x265 (HEVC), and on rather good quality images, they are very
competitive, that's not a joke!!! I have tested -l8 quality setting on 30
rather good quality images against x265, and on 20-22 images I prefer the
results of 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
2017 Mar 23
4
[LLD] Can't create dynamic relocation R_X86_64_64 against local symbol in readonly segment
Hi,
the attached example works with bfd-ld and with gold, but not with lld:
$ cat rodatareloc.s
...
.align 16
leaq .JTab(%rip), %r10
jmp *(%r10, %rdx, 8)
...
.section .rodata
.JTab:
.quad .L00, .L01, .L02, .L03, .L04, .L05, .L06, .L07
.quad .L08, .L09, .L10, .L11, .L12, .L13, .L14, .L15, .L16
$ gcc -o rodatareloc.s.o -c rodatareloc.s
$ lld -o rodatareloc.so -shared
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
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
2017 May 25
0
NHW Codec - next lower quality settings
Hello,
I spoke a little quickly when I proposed a £1000 rewards... because there
is still some "easy" processing to increase compression in the NHW codec,
like increasing wavelet coefficients threshold, decreasing again residual
coding.I will try to code it tomorrow and this weekend, and will let you
know what it gives.
A new idea I'm thinking of not to have too much aliasing and
2017 Feb 16
0
NHW Project - 2017 timetable
Hello all,
Just a quick message for those interested in the NHW Project.I realize that
I have too little time to spend on the project currently and I feel that
this year will be very important after 6-7 years for its success or not.I
already had some few replies from some companies (and a major one), and
they can not spend some time, spend some engineers on my work because there
is no
2018 Jan 08
0
NHW Project - high compression - aliasing
Hello,
Happy New Year to the forum!!!
I am still working on removing the aliasing from the decoded Y frames, but
it is not that easy, I am also looking for a rather cheap solution... I
will insist on it, because once it's done it will open the door to high
compression and increasing wavelet coeffs threshold of the dead-zone...
The NHW Project has new approaches: it has a good neatness and
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 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
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
-