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   -> Volume 2, Issue 18

FBI Wavelet/Scalar Quantization image coding standard
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Author Message
Chris Brislawn, Los Alamos National Laboratory

PostPosted: Fri Nov 29, 2002 3:40 pm    
Subject: FBI Wavelet/Scalar Quantization image coding standard
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FBI Wavelet/Scalar Quantization image coding standard

Material related to the FBI's Wavelet/Scalar Quantization (WSQ)
standard (IAFIS-IC-0110) for compression of gray-scale fingerprint
images is available via anonymous ftp from the Los Alamos ftp host (

Login under the user name "anonymous" and use your e-mail ident
for a password. Material related to the WSQ compression standard
is in the directory pub/WSQ. Here's a list of the current contents:

Directory: Contents:
---------- ---------
print_data sample fingerprint image data
tutorial demo program on the symmetric wavelet transform algorithm
documents papers in electronic format related to the specification
e-memos copies of old electronic memos, labelled by date

In particular, the specification itself is available in WSQ/documents,
along with several supporting technical and expository papers:

File: Title, Date of last revision:
----- -----------------------------
wsqSpec2 "WSQ gray-scale fingerprint image compression specification"
ver. 2.0, 2/16/93. NOTE: missing pictures on p. 16

classify "Classification of symmetric wavelet transforms", 3/22/93.
Includes description of WSQ wavelet transform algorithm.

wsqSynop "The FBI Wavelet/Scalar Quantization Standard for gray-scale
fingerprint image compression", 4/93. Missing pictures.
A friendly synopsis of the complete WSQ algorithm.

bit-alloc "Proposed first-generation WSQ bit allocation procedure,"
9/8/93. Computing scalar quantizer parameters, like "q".

We also have an electronic mailing list for parties interested in
receiving timely updates on developments concerning the standard.
If you'd like to be added to this mailing list, or if you don't have
ftp service or would simply prefer to be sent hard copies of these
papers, please contact me at one of the numbers given below.

NOTE: Please do not ask us for copies of our software; the Los Alamos
WSQ software has been reserved for official use only.

A public WSQ implementation for Windows 3.1 platforms has been written
at Washington University and made available by anonymous ftp, as posted
in Wavelet Digest, vol. 2, no. 14, Oct. 5, 1993. In addition to the
above documents, we can also provide the reference (cited in WD vol. 2,
no. 14) on which the Washington University WSQ implementation is based:

John J. Werner, "IAFIS Use of the Wavelet Scalar Quantization (WSQ)
Compression/Decompression Algorithm," NIST Conference, Dec. 8, 1992.

Send requests to me, as this document is available in hard copy form only.

DISCLAIMER: The Washington University software has not been certified
as complying with the official WSQ gray-scale fingerprint image compression
specification; this memo is for informative purposes only and does not
imply any endorsement or guarantee of said software by the US Government.

Chris Brislawn brislawn@LANL.GOV
Los Alamos National Laboratory (505) 665-1165
Computer Research/Applications Group FAX: 665-5220
Mail Stop B-265
Los Alamos, NM 87545-1663
All times are GMT + 1 Hour
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