Yamaha BRX-610 - Инструкция по эксплуатации - Страница 221

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Communications of the ACM, April 1991 (vol. 34 no. 4), pp. 30-44.

(Adjacent articles in that issue discuss MPEG motion picture compression, applications 
of JPEG, and related topics.) If you don’t have the CACM issue handy, a PostScript file 
containing a revised version of Wallace’s article is available at http://www.ijg.org/files/
wallace.ps.gz. The file (actually a preprint for an article that appeared in IEEE Trans. 
Consumer Electronics) omits the sample images that appeared in CACM, but it 
includes corrections and some added material.  Note: the Wallace article is copyright 
ACM and IEEE, and it may not be used for commercial purposes.
A somewhat less technical, more leisurely introduction to JPEG can be found in “The 
Data Compression Book” by Mark Nelson and Jean-loup Gailly, published by M&T 
Books (New York), 2nd ed. 1996, ISBN 1-55851-434-1. This book provides good 
explanations and example C code for a multitude of compression methods including 
JPEG. It is an excellent source if you are comfortable reading C code but don’t know 
much about data compression in general. The book’s JPEG sample code is far from 
industrial-strength, but when you are ready to look at a full implementation, you’ve got 
one here...
The best currently available description of JPEG is the textbook “JPEG Still Image 
Data Compression Standard” by William B. Pennebaker and Joan L. Mitchell, 
published by Van Nostrand Reinhold, 1993, ISBN 0-442-01272-1. Price US$59.95, 
638 pp. The book includes the complete text of the ISO JPEG standards (DIS 10918-1 
and draft DIS 10918-2).
Although this is by far the most detailed and comprehensive exposition of JPEG 
publicly available, we point out that it is still missing an explanation of the most 
essential properties and algorithms of the underlying DCT technology.
If you think that you know about DCT-based JPEG after reading this book, then you are 
in delusion. The real fundamentals and corresponding potential of DCT-based JPEG are 
not publicly known so far, and that is the reason for all the mistaken developments 
taking place in the image coding domain.
The original JPEG standard is divided into two parts, Part 1 being the actual 
specification, while Part 2 covers compliance testing methods. Part 1 is titled “Digital 
Compression and Coding of Continuous-tone Still Images, Part 1: Requirements and 
guidelines” and has document numbers ISO/IEC IS 10918-1, ITU-T T.81. Part 2 is 
titled “Digital Compression and Coding of Continuous-tone Still Images, Part 2: 
Compliance testing” and has document numbers ISO/IEC IS 10918-2, ITU-T T.83.
The JPEG standard does not specify all details of an interchangeable file format. For the 
omitted details we follow the “JFIF” conventions, revision 1.02. A copy of the JFIF 
spec is available from:

Literature Department

C-Cube Microsystems, Inc.
1778 McCarthy Blvd.

Milpitas, CA 95035

phone (408) 944-6300,  fax (408) 944-6314

A PostScript version of this document is available at http://www.ijg.org/files/jfif.ps.gz. 
There is also a plain text version at http://www.ijg.org/files/jfif.txt.gz, but it is missing 
the figures.
The TIFF 6.0 file format specification can be obtained by FTP from ftp://ftp.sgi.com/
graphics/tiff/TIFF6.ps.gz. The JPEG incorporation scheme found in the TIFF 6.0 spec 
of 3-June-92 has a number of serious problems. IJG does not recommend use of the 
TIFF 6.0 design (TIFF Compression tag 6). Instead, we recommend the JPEG design 
proposed by TIFF Technical Note #2 (Compression tag 7). Copies of this Note can be 
obtained from http://www.ijg.org/files/. It is expected that the next revision of the TIFF 
spec will replace the 6.0 JPEG design with the Note’s design. Although IJG’s own code 
does not support TIFF/JPEG, the free libtiff library uses our library to implement TIFF/
JPEG per the Note.
ARCHIVE LOCATIONS
The “official” archive site for this software is www.ijg.org. The most recent released 
version can always be found there in directory “files”. This particular version will be 
archived as http://www.ijg.org/files/jpegsrc.v7.tar.gz, and in Windows-compatible 
“zip” archive format as http://www.ijg.org/files/jpegsr7.zip.
The JPEG FAQ (Frequently Asked Questions) article is a source of some general 
information about JPEG. It is available on the World Wide Web at http://www.faqs.org/
faqs/jpeg-faq/ and other news.answers archive sites, including the official 
news.answers archive at rtfm.mit.edu: ftp://rtfm.mit.edu/pub/usenet/news.answers/
jpeg-faq/. If you don’t have Web or FTP access, send e-mail to mail-
server@rtfm.mit.edu with body

send usenet/news.answers/jpeg-faq/part1

send usenet/news.answers/jpeg-faq/part2

ACKNOWLEDGMENTS
Thank to Juergen Bruder of the Georg-Cantor-Organization at the Martin-Luther-
University Halle for providing me with a copy of the common DCT algorithm article, 
only to find out that I had come to the same result in a more direct and comprehensible 
way with a more generative approach.
Thank to Istvan Sebestyen and Joan L. Mitchell for inviting me to the ITU JPEG (Study 
Group 16) meeting in Geneva, Switzerland.
Thank to Thomas Wiegand and Gary Sullivan for inviting me to the Joint Video Team 
(MPEG & ITU) meeting in Geneva, Switzerland.
Thank to John Korejwa and Massimo Ballerini for inviting me to fruitful consultations 
in Boston, MA and Milan, Italy.
Thank to Hendrik Elstner, Roland Fassauer, and Simone Zuck for corresponding 
business development.
Thank to Nico Zschach and Dirk Stelling of the technical support team at the Digital 
Images company in Halle for providing me with extra equipment for configuration 
tests.
Thank to Richard F. Lyon (then of Foveon Inc.) for fruitful communication about JPEG 
configuration in Sigma Photo Pro software.
Last but not least special thank to Thomas G. Lane for the original design and 
development of this singular software package.

FILE FORMAT WARS
The ISO JPEG standards committee actually promotes different formats like JPEG-
2000 or JPEG-XR which are incompatible with original DCT-based JPEG and which 
are based on faulty technologies. IJG therefore does not and will not support such 
momentary mistakes (see REFERENCES). We have little or no sympathy for the 
promotion of these formats. Indeed, one of the original reasons for developing this free 
software was to help force convergence on common, interoperable format standards for 
JPEG files. Don’t use an incompatible file format! (In any case, our decoder will remain 
capable of reading existing JPEG image files indefinitely.)
TO DO
v7 is basically just a necessary interim release, paving the way for a major breakthrough 
in image coding technology with the next v8 package which is scheduled for release in 
the year 2010.
Please send bug reports, offers of help, etc. to jpeg-info@jpegclub.org.

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