<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=ISO-8859-1">
</head>
<body bgcolor="#FFFFFF" text="#000000">
Hi list, <br>
<br>
I'd like to share with you what I've found so far, in case someone
can contribute with fresh ideas.<br>
<br>
I've focused entirely on the <b>StitchingIntensityLayer</b> section
and tried to figure out it's contents. The section is a DEFLATE
stream, compressed with zlib. This explains it's high entropy and
the fact that changing even a single bit of it, resulted in the
application refusing to interpret it. <br>
<br>
I decompressed the StitchingIntensityLayer section of every file in
my possession and found out that it always decompresses to a stream
of 174231 bytes, regardless of the file's size, dimensions or
resolution. I have in 4 different MRXS 2.2 files and all of them
contain a StitchingIntensityLayer section that, when decompressed,
occupies 174231 bytes.<br>
<br>
174231 is a multiple of 9 and I quickly thought of the 9-byte record
pattern of <b>VIMSLIDE_POSITION_BUFFER.default</b> nonhierarchical
section. This produces at most 19,359 records (174231 / 9) which I
believe is unlikely to be similar to VIMSLIDE_POSITION_BUFFER.<br>
<br>
Nevertheless I parsed the decompressed streams, interpreting them as
9-byte records with the following structure:<br>
1byte - 4byte signed int - 4byte signed int<br>
and dumped them as text. There is one interesting thing about this,
which may be evidence that these are indeed 9-byte records: The
single byte in every record appears to only have 0 or 1 as a value.
Furthermore, whenever it equals 0, the two integers are always zero
two. Whenever it is 1, the integers have values in them. Moreover,
the integers never contain negative values, even though I read them
as signed integers.<br>
<br>
I'm attaching the decompressed binary StitchingIntensityLayer
section of the first of the three files available in openslide's web
site, as well as the 9-byte record interpretation of it.<br>
<br>
Any ideas on what these values mean or however else I should try to
interpret the section are welcome!<br>
<br>
Regards<br>
Pappas Agelos<br>
<br>
</body>
</html>