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   -> Volume 7, Issue 8


Question: WSQ bin width computation for deep-bit images
 
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Ken Sutherland (ken@j-mac.co.jp)
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PostPosted: Thu Jul 23, 1998 9:53 am    
Subject: Question: WSQ bin width computation for deep-bit images
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#17 Question: WSQ bin width computation for deep-bit images

Howdy!

I have attempted to code the bin width computation published in the
FBI digitized fingerprint compression (WSQ) standard. It seems to work
reasonably well for 8-bit images, but I'd like to use the same
procedure for "deep-bit" 12 and 16-bit (signed and unsigned) gray
scale medical images. However, the computed bin widths are
unpredictable, resulting in over (or under) compression.

I believe that the unpredictable results are being cause by huge
variance values computed from the subbands. The variance values are
huge especially with signed 16-bit images because the orginal pixel
values can range between plus and minus 32,768.

I realize this is quite a long shot, but has anyone out there
attempted to adapt the interative procedure for computing bin widths
to deep-bit images? Or is the algorithm applicable strictly to 8-bit
images?

References to the WSQ standard (.ps files) can be found here:

http://www.wavelet.org/wavelet/digest_02/digest_02.18.html#9

Thanks!

Ken Sutherland
J-MAC SYSTEM INC.
ken@j-mac.co.jp
http://www.j-mac.co.jp/
http://www.voicenet.co.jp/~ken
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