[FFmpeg-devel] donation for snow

[malc at pulsesoft.com]

"Jason Garrett-Glaser" <darkshikari at gmail.com> writes:

> 2008/11/6 Michael Niedermayer <michaelni at gmx.at>:
>> On Thu, Nov 06, 2008 at 04:39:45PM -0800, Baptiste Coudurier wrote:
>>> Jason Garrett-Glaser wrote:
>>> >> Do you have any comparision data ? I would, too, be interested in having
>>> >> these comparisions, also knowing which jp2k encoder was used, test
>>> >> material, etc...
>>> >
>>> > I remember being linked to a paper on the topic a while back which had
>>> > the numbers I was using (though I don't remember them exactly).
>>> > However, I don't trust PSNR anyways, and if you wanted to do a real
>>> > comparison, I would say that a visual test would be the only one worth
>>> > bothering with.
>>>
>>> I understand, what puzzles me is that D-Cinema guys, who are know to be
>>> really picky about picture quality (choosing 12 bit XYZ is a thing),
>>> chose jp2k over other codecs, having done many extensive visual tests
>>> (they don't trust PSNR, Im not sure they care about it).
>>
>> heres a comparission, i hope ill find more. The one i meant was older,
>> ill try to find some more latr ...
>>
>> http://wftp3.itu.int/av-arch/jvt-site/2007_04_SanJose/JVT-W110.zip
>>
>> a brief look found in the pdf (the xls are just crashing my openoffice)
>> "
>>  Results ? SVC against JPEG2000
>>  Similar PSNR for 1088p25
>>  Visual comparisons to be performed for each resolution
>> "
>>
>> Based on this and that wavelet artifacts look more pleasing than
>> blocking artifacts i suspect but may be wrong that j2k beats h264 SVC for
>> intra coding.
>
> I know its been a while, but I just did a small JPEG-2K vs JPG vs x264
> comparison for unrelated reasons, so I figured I'd post it.  It can be
> found here:
>
> http://forum.doom9.org/showpost.php?p=1214866&postcount=12
>
> The results are embarrassing.
>
> Dark Shikari

And some more material:

http://stat.columbia.edu/~jakulin/jpeg/artifacts.htm
http://stat.columbia.edu/~jakulin/Wavelets/index.html

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