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what the #### is this i-ces ?

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whygee

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Jun 18, 2009, 4:15:36 PM6/18/09
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Hello,

a friend directed me to http://www.i-ces.org/compression/image.html
with the suspicion that it is a patent troll.
I've never heard about this thing (though it's written
in french and I'm french).

He also noticed that the 3 "example pictures" (close-up of the
tower's tip) are "fakes", the files are identical, made under PhotoShop,
and the only difference is the name of the file that is also included
inside the header.

The site "looks nice" but does not convince me.

Any hint ? (not that I am interested, I'm just curious)

yg
--
http://ygdes.com / http://yasep.org

Thomas Richter

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Jun 18, 2009, 9:24:12 PM6/18/09
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It's hard to say what they are actually doing, and even harder what they
are actually claiming. You find a couple of patent numbers on their
page, so in principle you could look it up - I haven't taken the time to
judge them.

The "compression speed" looks fuzzy because they don't state the
sources, the "optimization XR" looks fuzzy because they don't claim
whether they alter the quality of the shot, though they post irrelevant
details like the lense used here. (Should I care?)

What should probably be understood by the reader is that JPEG-XR defines
the reconstruction precisely, which means that you have no freedom in
your decoder. It also means that once the reconstructed image is
*defined* (i.e. you know the value of each pixel), then there is only
one way to encode it so you get these values - there are no real encoder
freedoms I'm aware of that would work without altering the image. (There
are some that do alter the image, but that's OK). Thus, pretty unclear
what all this means.

So long,
Thomas

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