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<DIV dir=ltr align=left><SPAN class=984033821-23022008><FONT face=Arial
color=#0000ff size=2>Bruce-</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=984033821-23022008><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=984033821-23022008><FONT face=Arial
color=#0000ff size=2>It is not clear to me what sort of "study" you would need
to convince you, as the ISO standard for encoding data into the JPEG-2000 file
format is by construction mathematically and numerically lossless
process. (Indeed, "compression", i.e. throwing away bits so as to
further reduce storage requirements, is actually not defined within the scope of
the standard.)</FONT></SPAN></DIV>
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<DIV dir=ltr align=left><SPAN class=984033821-23022008><FONT face=Arial
color=#0000ff size=2>-mpg</FONT></SPAN></DIV>
<DIV><FONT face=Arial color=#0000ff size=2></FONT> </DIV><FONT face=Arial
color=#0000ff size=2></FONT><FONT face=Arial color=#0000ff size=2></FONT><BR>
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<FONT face=Tahoma size=2><B>From:</B> discuss-bounces@lists.osgeo.org
[mailto:discuss-bounces@lists.osgeo.org] <B>On Behalf Of
</B>Bruce.Bannerman@dpi.vic.gov.au<BR><B>Sent:</B> Saturday, February 23, 2008
1:58 AM<BR><B>To:</B> OSGeo Discussions<BR><B>Subject:</B> RE: [OSGeo-Discuss]
'lossless' JPEG2000<BR></FONT><BR></DIV>
<DIV></DIV><BR><FONT face=sans-serif size=2>IMO:</FONT> <BR><BR><FONT
face=sans-serif size=2>Thanks for the reply </FONT><FONT
size=2><TT>Traian,</TT></FONT> <BR><BR><BR><FONT face=sans-serif size=2>I
don't mean to be dismissive of this report, but I was hoping for something
more definitive to prove that 'lossless' JPEG compressions did indeed protect
the integrity of the data.. </FONT><BR><BR><FONT face=sans-serif
size=2>Perhaps its just my ignorance, but I was hoping for something along the
lines of:</FONT> <BR><BR><FONT face=sans-serif size=2>- a study of a range of
typical spatial 'imagery'.</FONT> <BR><BR><FONT face=sans-serif size=2>-
evaluation of all spectral values for each pixel in each image before
compression.</FONT> <BR><BR><FONT face=sans-serif size=2>- 'lossless'
compression of the images</FONT> <BR><BR><FONT face=sans-serif size=2>-
restoration of the compressed images</FONT> <BR><BR><FONT face=sans-serif
size=2>- comparison of all spectral values for each pixel in each restored
image against the original pre-compressed values.</FONT> <BR><BR><FONT
face=sans-serif size=2>- definitive statement with reference to the study
results.</FONT> <BR><BR><BR><FONT face=sans-serif size=2>Bruce</FONT>
<BR><BR><BR><FONT size=2><TT>> </TT></FONT> <BR><FONT size=2><TT>>
JPEG2K supports lossless via a reversible wavelet transform with <BR>>
integral coefficients (which make it reversible, and so lossless). <BR>>
Here is a reference:</TT></FONT> <BR><FONT size=2><TT>> </TT></FONT>
<BR><FONT size=2><TT>>
http://www.ece.uvic.ca/~mdadams/publications/pacrim2001.pdf</TT></FONT>
<BR><FONT size=2><TT>> </TT></FONT> <BR><FONT size=2><TT>>
</TT></FONT> <BR><FONT size=2><TT>> </TT></FONT> <BR><FONT
size=2><TT>> Traian</TT></FONT> <BR><FONT size=2><TT>>
</TT></FONT> <BR><BR><BR><BR><BR><BR>
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