Message-Id: <mailto:199408292315.SAA02888@library.wustl.edu> Date: Mon, 29 Aug 1994 03:39:23 -0500 From: Sandeep Somaiya <mailto:sandeep@NEXT2.VTLS.COM> Subject: Re: Image database and Huffman Encoding To: Multiple recipients of list IMAGELIB <mailto:IMAGELIB@ARIZVM1.BITNET>
Raymond Lauzzana <mailto:lauzzana@NETCOM.COM> wrote: >>Can someone give an exact reference, ie. publisher or address for
>>CCITT Group 3 or Group 4. What is CCITT?
Arthur Matheny <mailto:matheny@RITCHIE.ACOMP.USF.EDU> wrote: >>CCITT ÿnternational Telegraph and Telephone Consultative Committee
The following is some information from USENET comp.compression on CCITT. A.SPECS: Specs for Group 3 and 4 image coding (group 3 is very similar to group 4) are in CCITT (1988) volume VII fascicle VII.3. They are recommendations T.4 and T.6 respectively. There is also an updated spec contained in 1992 recommendations T.1 to T.6. CCITT specs are available by anonymous ftp. The T.4 and T.6 specs are on src.doc.ic.ac.uk in directory /computing/ccitt/ccitt-standards/ccitt/1988/ascii, files 7_3_01.txt.Z and 7_3_02.txt.Z respectively. B.PAPERS: The following paper covers T.4, T.6 and JBIG: "Review of standards for electronic imaging for facsimile systems" in Journal of Electronic Imaging, Vol. 1, No. 1, pp. 5-21, January 1992. C.SOURCE CODE: Source code can be obtained as part of a TIFF toolkit - TIFF image compression techniques for binary images include CCITT T.4 and T.6: sgi.com:/graphics/tiff/v3.2.tar.Z [192.48.153.1] Software for reading and writing CCITT Group 3 and 4 images is also available in directory merry.cs.monash.edu.au:/pub/alanf/TIFF_FAX (130.194.67.101). Regards, Sandeep Somaiya VTLS INC.,1800 Kraft Drive Blacksburg VA 24060 W-(703) 231 3605 Fax-(703) 231 3648 Email:mailto:somaiyas@vtls.com NeXTMail: mailto:sandeep@next2.vtls.com WWW:http://www.vtls.com "Look, Learn, Listen .. Libraries change Lives"