Yamaha BRX-610 Owner's Manual page 64

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Enlarged version

Communications

of the ACM, April 1991 (voh 34 no. 4), pp. 3{)-44.

(Ac[iacent 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 al http://www.ijg.org/files/

wallace.ps.gz.

The file (actually a preprint R)r an article that appeared in IEEE Trans.

Consumer

Electronics)

omits the sample images lhat appeared in CACM, but it

includes corrections

and some added materiah

Note: the Wallace

article is copyright

ACM and IEEE, and it ]nay not be used l_.}r c ommercial

purposes.

A somewhat less technical,

more leisurely

introduction

to JPEG can be lound in "The

Data Compression

Book" by Mark Nelson and Jeanqoup 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 k)r a multitude of compression

methods including

JPEG. [t is an excellent

source if you am comtk}rtable reading C code but don't know

much about data compression

in generah The book's JPEG sample code is lar from

industrial-strength,

bul when you are ready to look al a hill implementation,

you've gol

one hel_...

The best cun'ently 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 (1-442-01272-1.

Price US$59.95,

638 pp. The book includes the complete texl of the [SO JPEG standards (DIS I(NI 8-1

and dralt DIS 1(}918-2).

Although this is by lar lhe 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

D(T technology.

[f you think that you know about DCT-based

JPEG alter 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 k)r all the mistaken

developments

taking place in the image coding domain.

The original JPEG standard is divided into two parts, Parl 1being the actual

specification,

while Part 2 covers compliance

testing methods. Part 1 is tilled "Digital

Compression

and Coding of Continuous-tone

Still lmages_ Part 1: Requirements

and

guidelines"

and has document

numbers

ISO/IEC IS I(N 18-L ITU-T T.81. Part 2 is

titled "Digdal

Compression

and Coding of Continuous-tone

Slill Images,

Part 2:

Compliance

testing"

and has document

numbers ISO/[EC

IS 11)918-2_ ITU-T T.83.

The JPEG standard does ]lot specit_¢ all details of an interchangeable

file lormat. For the

omitted details we lollow the "JF[F" conventions,

l_vision

1.02. A copy of the JFIF

spec is available from:

Literature

Departmenl

C=Cube Microsystems,

hie.

1778 McCartfiy Blvd.

Milpitas, CA 95035

phone (4{)8) 944-6300,

lax (408) 944-6314

A PostScript

version of this document

is available at hltl)://www.ijg.org/files/jfiEps.gz.

There is also a plain texl version al http://www.ijg.org/files/jfiEtxt.gz,

but it is missing

lhe figures.

The TIFF 6.0 file l_.}rmatspecification

can be obtained by FTP lrom ltp://ftp.sgi.com/

graphics/titf/T[FF6.ps.gz.

The JPEG incorporation

scheme fi)und in the TIFF 6.{) spec

of 3-June-92

has a number of serious problems.

[JG does not recommend

use of the

TIFF 6.{) design (TIFF Compression

tag 6). Instead, we recommend

the JPEG design

1)roposed by TIFF Technical

Note #2 (Compression

tag 7). Copies of this Note carl be

obtained fi'om 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 lJG's own code

does not support T[FF/JPEG,

the h'ee liblil f library uses our library to implement

TIFF/

JPEG per the Note.

archive

sites, inchlding the ofticial

news.answers

archive at rffln.mit.edu:

ftp://rlhn.mit.edu/pub/usenet/news.answers/

jpeg-laq/. If you dorl'l have Web or FPP access, send e-mail to mail-

server @rlhn.mit.edu

with body

send usenet/news.answers/j

peg-I aq/1)a111

send usenet/news.answers/j

peg-I aq/1)a112

ACKNOWLEDGMENTS

Thank to Juergen Bruder of the Georg-Cantor-Organization

at the Martin-Luther-

1Jniversity Halle lor 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 [TU JPEG (Study

Group 16) meeting in Geneva, Switzerland.

Thank to Thomas Wiegand and Gary Sullivan lor inviting me to the Joint Vide() Team

(MPEG & ITU) meeting in Geneva, Switzerland.

Thank to John Korejwa and Massimo Ballerini

ff)r inviting me to lruilhll consultations

ill Bostom MA and Milam Italy.

Thank to Hendrik Elstner, Roland Fassauer, and Simone Zuck li_r corresponding

business development.

Thank to Nico Zschach

and Dirk Stelling of the technical support tear]] at the Digital

hnages company in Halle R)r providing

me with extra equipment R)r configuration

tests.

Thank to Richard F. Lyon (then of Foveon Inc.) li_r lruitlul c(m]municalion

aboul JPEG

configuration

in Sigma Photo Pro soltware.

Last bul not least special thank to Thomas G. Lane lor the original design and

development

of Ibis singular soltware package.

FILE FORMAT WARS

The [SO JPEG standards committee

actually promotes

dill)rent

lk_rmats like JPEG-

21)(11) o r JPEG-XR which are incompatible

with original DCT-based

JPEG and which

are based on laulty technologies.

IJG therefi_re does not and will not support such

momentary

mistakes (see REFERENCES).

We have little or no sympathy

l_orthe

1)romotion of these lk)rmals. [ndee& one of the original

reasons R)r developing

this free

soBware was to help lorce convergence

on conmlon, interoperable

l_}rmat standards lot

JPEG files. Don't use an incompatible

file lormat! (In any case, our decoder will remain

capable of reading existing JPEG image files indefinitely.)

TO DO

v7 is basically jusl a necessary

interim release, paving the way lot a m:kior breakthrough

in image coding technology

with the nexl v8 package

which is scheduled

liar release ill

lhe year 2010.

Please send bug reports, oll)rs

of help, etc. to jpeg-inlo@jpegclub.org.

•

About International

Components

for Unieode

I('U License - ICU 1.8.1 and later

AN[) PERM[SSION

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Business Machines Corporation

and others

Permission

is hereby granted_ thee of charge,

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to deal ill the Soltware

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•

About libpng

This copy of the libpng notices is provided lor your convenience.

[n case of ;my

discrepancy

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this copy and the notices in the file png.h that is included ill the

libpng distributiom

the latter shall pmvaih

COPYR[GHT

NOTICE,

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[f you modi*3; libpng you ]nay insert additional nolices immediately

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This code is released

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libpng versions

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(C)

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vii

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