Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!cornell!uw-beaver!rice!sun-spots-request
From: gfr@cobra.mitre.org (Glenn Roberts)
Newsgroups: comp.sys.sun
Subject: Re: FAX image compression/decompression
Message-ID: <8902161452.AA02217@cobra.mitre.org>
Date: 28 Feb 89 15:08:34 GMT
Sender: usenet@rice.edu
Organization: Sun-Spots
Lines: 35
Approved: Sun-Spots@rice.edu
Original-Date: Thu, 16 Feb 89 09:52:39 EST
X-Sun-Spots-Digest: Volume 7, Issue 172, message 13 of 15
X-Issue-Reference: v7n155

>"Is anyone aware of Sun software (preferably shareware) that implements
>the CCITT Group IV (Facsimile) binary image compression/decompression
>algorithm? 

I received this response from our local Sun office:

----- Begin Included Message -----

"Sun Cunsulting Special" call your sales rep and order it today!  (:-)

Price:
                        Single        Quantity 10   Unlimited   Upgrade
CONSULT-FAXCOMP           300             900         4,000       300

"The Consulting CCITT Image Compression/Decompression Special is a
software implementation of the Group 3 1-dimensional and the Group 4
2-dimensional digital facsimile transmission standards as defined by
the CCITT (Comite Consultatif International Telegraphique et
Telephonique), an international standards defining body.  These are the
compression/decompression schemes used for FAX facsimile transmission.

"The Group 3 1-dimensional scheme encodes an input image run length
using a modified Huffman code to produce the transmittable facsimile.
The Group 4 2-dimensional encoding is an extension to the Group 3
1-dimensional algorithm (mentioned above) and is known as the modified
READ (relative element address designate) code.  It is a more efficient
coding technique and has been designed for future expansion in the
areas of color-coding, grey-scaling, and pattern recognition."

(source is included)

----- End Included Message -----

- Glenn Roberts, The MITRE Corp., McLean VA (703) 883-6820
  gfr@cobra.mitre.org