The Wavelet Digest Homepage
Return to the homepage
Search the complete Wavelet Digest database
Help about the Wavelet Digest mailing list
About the Wavelet Digest
The Digest The Community
 Latest Issue  Back Issues  Events  Gallery
The Wavelet Digest
   -> Volume 7, Issue 8

Question: WSQ bin width computation for deep-bit images
images/spacer.gifimages/spacer.gif Reply into Digest
Previous :: Next  
Author Message
Ken Sutherland (

PostPosted: Thu Jul 23, 1998 9:53 am    
Subject: Question: WSQ bin width computation for deep-bit images
Reply with quote

#17 Question: WSQ bin width computation for deep-bit images


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

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


Ken Sutherland
All times are GMT + 1 Hour
Page 1 of 1

Jump to: 

disclaimer -
Powered by phpBB

This page was created in 0.023859 seconds : 18 queries executed : GZIP compression disabled