ISO/IEC 15444-5:2021

INTERNATIONAL ISO/IEC
STANDARD 15444-5
Third edition
2021-10
Information technology — JPEG 2000
image coding system —
Part 5:
Reference software
Technologies de l'information — Système de codage d'images JPEG
2000 —
Partie 5: Logiciel de référence
Reference number
© ISO/IEC 2021
© ISO/IEC 2021
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ii
© ISO/IEC 2021 – All rights reserved

Foreword
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Commission) form the specialized system for worldwide standardization. National bodies that are
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The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of document should be noted.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
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For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
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see www.iso.org/iso/foreword.html. In the IEC, see www.iec.ch/understanding-standards.
This document was prepared by ITU-T (as ITU-T REC. T.803) and drafted in accordance with its editorial
rules, in collaboration with Joint Technical Committee ISO/IEC JTC 1, Information technology,
Subcommittee SC 29, Coding of audio, picture, multimedia and hypermedia information.
This third edition cancels and replaces the second edition (ISO/IEC 15444-5:2015), which has been
technically revised.
The main changes are as follows:
— addition of a software reference implementation of a High Throughput (HT) block coding algorithm
specified in Rec. ITU-T T.814 | ISO/IEC 15444-15; and
— addition of a software reference implementation of a JPH file format specified in Rec. ITU-T T.814 |
ISO/IEC 15444-15.
A list of all parts in the ISO/IEC 15444 series can be found on the ISO and IEC websites.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html and www.iec.ch/national-
committees.
© ISO/IEC 2021 – All rights reserved iii

TABLE OF CONTENTS
Page
1 Scope . 1
2 Normative references . 2
2.1 Identical Recommendations | International Standards . 2
2.2 Additional references . 2
3 Definitions . 2
4 Abbreviations and symbols . 5
4.1 Abbreviations . 5
4.2 Symbols . 5
5 Conventions . 6
6 General description . 6
7 Copyright and licensing . 6
8 Platform requirements . 7
9 Reference code structure . 7
9.1 JasPer executables . 7
9.2 JJ2000 executables . 7
9.3 OpenJPEG executables . 8
9.4 TT executable . 8
9.5 Codestream-parser executable . 8
10 Software availability and updates . 8
Annex A – JASPER – C reference software – software description . 9
A.1 Introduction . 9
A.2 Software updates . 9
A.3 Version numbering . 9
A.4 Software overview . 9
A.5 JasPer library . 10
A.6 JasPer demo application programs . 10
A.7 Software requirements . 11
A.8 Building the software . 11
A.9 Using the software . 11
Annex B – JJ2000 – Java reference software – software description . 12
B.1 Introduction . 12
B.2 Software updates . 12
B.3 Software architecture . 12
B.4 Installing and running the software . 13
Annex C – OpenJPEG – C reference software - software description . 14
C.1 Introduction . 14
C.2 Getting and updating the software . 14
C.3 Building and using the software . 14
C.4 Testing the software . 14
Annex D – TT – C++ reference software – software description . 15
D.1 General . 15
D.2 Getting the software . 15
D.3 Building and using the software . 15
D.4 Source files . 15
D.5 Testing the software . 16
Annex E – Codestream-parser – Python reference software – software description . 17
E.1 General . 17
E.2 Getting the software . 17
E.3 Using the software . 17
E.4 Source files . 17
Rec. ITU-T T.804 (06/2021) v
© ISO/IEC 2021 – All rights reserved

Page
E.5 Testing the software . 17
Bibliography . 18
Electronic attachment: JASPER, JJ2000, OPENJPEG, TT, Codestream-parser reference packages.
vi Rec. ITU-T T.804 (06/2021) © ISO/IEC 2021 – All rights reserved

INTERNATIONAL STANDARD
ITU-T RECOMMENDATION
Information technology –
JPEG 2000 image coding system: Reference software
1 Scope
Rec. ITU-T T.800 | ISO/IEC 15444-1 defines a set of lossless and lossy compression methods for coding continuous-
tone, bi-level, greyscale or colour digital still images. This Recommendation | International Standard provides three
independently created software reference implementations of Rec. ITU-T T.800 | ISO/IEC 15444-1, in order to assist
implementers of Rec. ITU-T T.800 | ISO/IEC 15444-1 in testing and understanding its content. The packages are JASPER,
JJ2000 and OPENJPEG.
This Recommendation | International Standard also provides an independently created software reference implementation
of Rec. ITU-T T.814 | ISO/IEC 15444-15, which specifies a high-throughput (HT) block coding algorithm that can be
used in place of the block coding algorithm of Rec. ITU-T T.800 | ISO/IEC 15444-1, in order to assist implementers of
Rec. ITU-T T.814 | ISO/IEC 15444-15 in testing and understanding its content. The package is TT.
This Recommendation | International Standard additionally provides an independently created software reference
implementation for parsing of a JP2 file format specified in Rec. ITU-T T.800 | ISO/IEC 15444-1 and a JPH file format
specified in Rec. ITU-T T.814 | ISO/IEC 15444-15, The package is Codestream-parser.
This Recommendation | International Standard does not define any additional part of the JPEG 2000 image coding system.
Each version of the J2K reference software contains source code, which can be compiled to provide the following
functionality:
– Transcoding from selected, widely available image formats into a JPEG 2000 codestream.
– Transcoding from selected, widely available image formats into the JP2 file format.
– Selection of a wide range of JPEG 2000 encoding options (as documented in each reference software).
– Decoding from a JPEG 2000 codestream to a range of selected widely available image formats.
– Processing of a JP2 file to extract a JPEG 2000 codestream for decoding and conversion to a range of
selected widely available image formats.
– The ability to extract metadata from a JP2 file, including the contents of the Image Header box and the
colour space.
– The decoding of JP2 files that use the three-component matrix-based form
...