ISO/IEC 15444-1:2024

Information technology — JPEG 2000 image coding system — Part 1: Core coding system

This Recommendation | International Standard defines a set of lossless (bit-preserving) and lossy compression methods for coding bi-level, continuous-tone grey-scale, palletized colour, or continuous-tone colour digital still images. This Recommendation | International Standard: ? specifies decoding processes for converting compressed image data to reconstructed image data; ? specifies a codestream syntax containing information for interpreting the compressed image data; ? specifies a file format; ? provides guidance on encoding processes for converting source image data to compressed image data; ? provides guidance on how to implement these processes in practice. NOTE ? As this specification was first published as common text only after ISO/IEC JTC1 had approved the first edition in 2000, edition numbers in the ITU and ISO/IEC versions are offset by one. This is the third edition of ITU-T T.800 and the fourth edition of ISO/IEC 15444-1.

Technologies de l'information — Système de codage d'images JPEG 2000 — Partie 1: Système de codage de noyau

General Information

• Status: Not Published
• Publication Date: 31-Oct-2024
• ICS: 35.040.30 - Coding of graphical and photographical information
• Technical Committee: ISO/IEC JTC 1/SC 29 - Coding of audio, picture, multimedia and hypermedia information
• Drafting Committee: ISO/IEC JTC 1/SC 29 - Coding of audio, picture, multimedia and hypermedia information
• Current Stage: 6060 - International Standard published
• Start Date: 01-Nov-2024
• Due Date: 14-Feb-2025
• Completion Date: 01-Nov-2024

Relations

• Revises: ISO/IEC 15444-1:2019 - Information technology — JPEG 2000 image coding system — Part 1: Core coding system
• Effective Date: 19-Aug-2023

Standards Content (Sample)

FINAL DRAFT
International
Standard
ISO/IEC
FDIS
15444-1
ISO/IEC JTC 1/SC 29
Information technology — JPEG
Secretariat: JISC
2000 image coding system —
Voting begins on:
2024-07-05
Part 1:
Core coding system
Voting terminates on:
2024-08-30
Technologies de l'information — Système de codage d'images
JPEG 2000 —
Partie 1: Système de codage de noyau
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
Reference number
ISO/IEC FDIS 15444­1:2024(en) © ISO/IEC 2024

FINAL DRAFT
ISO/IEC FDIS 15444-1:2024(en)
International
Standard
ISO/IEC
FDIS
15444-1
ISO/IEC JTC 1/SC 29
Information technology — JPEG
Secretariat: JISC
2000 image coding system —
Voting begins on:
Part 1:
Core coding system
Voting terminates on:
Technologies de l'information — Système de codage d'images
JPEG 2000 —
Partie 1: Système de codage de noyau
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
© ISO/IEC 2024
IN ADDITION TO THEIR EVALUATION AS
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
or ISO’s member body in the country of the requester.
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
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Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland Reference number
ISO/IEC FDIS 15444­1:2024(en) © ISO/IEC 2024

© ISO/IEC 2024 – All rights reserved
ii
Foreword
ISO (the International Organization for Standardization) and IEC (the International Electrotechnical
Commission) form the specialized system for worldwide standardization. National bodies that are members
of ISO or IEC participate in the development of International Standards through technical committees
established by the respective organization to deal with particular fields of technical activity. ISO and IEC
technical committees collaborate in fields of mutual interest. Other international organizations, governmental
and non-governmental, in liaison with ISO and IEC, also take part in the work.
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.
ISO and IEC draw attention to the possibility that the implementation of this document may involve the use of
(a) patent(s). ISO and IEC take no position concerning the evidence, validity or applicability of any claimed
patent rights in respect thereof. As of the date of publication of this document, ISO and IEC had not received
notice of (a) patent(s) which may be required to implement this document. However, implementers are
cautioned that this may not represent the latest information, which may be obtained from the patent database
available at www.iso.org/patents and https://patents.iec.ch. ISO and IEC shall not be held responsible for
identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT) 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 T.800) 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 fifth edition cancels and replaces the fourth edition (ISO/IEC 15444-1:2019), which has been technically
revised.
The main changes are as follows:
— addition of Annex N, which lists a registration request for media type image/j2c
— specify that the Mastering Display Metadata Box of Annex M is optional and has no defaults, reflecting
industry practice
— remove obsolete and erroneous reference to IETF RFC 2279
i
— clarify semantics of CEpoc
— update reference to ISO/CIE 11664-1, Rec. ITU-R BT.601 and Rec. ITU-R BT.709
— remove unused JPEG Utilities Registration Authority (JURA) term
— specify the value of Rsiz when extended capabilities are present but no profile is signalled.
A list of all parts in the ISO/IEC 15444 series can be found on the ISO and IEC websites.
© ISO/IEC 2024 – All rights reserved
iii
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 2024 – All rights reserved
iv
INTERNATIONAL STANDARD ISO/IEC 15444-1
RECOMMENDATION ITU-T T.800
Information technology – JPEG 2000 image coding system: Core coding system
Summary
This Recommendation | International Standard defines a set of lossless (bit-preserving) and lossy compression methods
for coding bi-level, continuous-tone grey-scale, palletized colour, or continuous-tone colour digital still images.
This Recommendation | International Standard:
– specifies decoding processes for converting compressed image data to reconstructed image data;
– specifies a codestream syntax containing information for interpreting the compressed image data;
– specifies a file format;
– provides guidance on encoding processes for converting source image data to compressed image data;
– provides guidance on how to implement these processes in practice.
This edition includes the following changes relative to the previous edition:
– addition of Annex N, which lists a registration request for media type image/j2c
– specify that the Mastering Display Metadata Box of Annex M is optional and has no defaults, reflecting
industry practice
– remove obsolete and erroneous reference to IETF RFC 2279
i
– clarify semantics of CEpoc
– update reference to ISO/CIE 11664-1, Rec. ITU-R BT.601 and Rec. ITU-R BT.709
– remove unused JPEG Utilities Registration Authority (JURA) term
– specify the value of Rsiz when extended capabilities are present but no profile is signalled
NOTE – As this specification was first published as common text only after ISO/IEC JTC1 had approved the first edition in 2000,
edition numbers in the ITU and ISO/IEC versions are offset by one. This is the fifth edition of ITU-T T.800 and the fifth edition of
ISO/IEC 15444-1.
© ISO/IEC 2024 – All rights reserved Rec. ITU-T T.800 (06/2019) v

FOREWORD
The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of
telecommunications, information and communication technologies (ICTs). The ITU Telecommunication
Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical,
operating and tariff questions and issuing Recommendations on them with a view to standardizing
telecommunications on a worldwide basis.
The World Telecommunication Standardization Assembly (WTSA), which meets every four years, establishes
the topics for study by the ITU-T study groups which, in turn, produce Recommendations on these topics.
The approval of ITU-T Recommendations is covered by the procedure laid down in WTSA Resolution 1.
In some areas of information technology which fall within ITU-T's purview, the necessary standards are
prepared on a collaborative basis with ISO and IEC.
NOTE
In this Recommendation, the expression "Administration" is used for conciseness to indicate both a
telecommunication administration and a recognized operating agency.
Compliance with this Recommendation is voluntary. However, the Recommendation may contain certain
mandatory provisions (to ensure, e.g., interoperability or applicability) and compliance with the
Recommendation is achieved when all of these mandatory provisions are met. The words "shall" or some
other obligatory language such as "must" and the negative equivalents are used to express requirements. The
use of such words does not suggest that compliance with the Recommendation is required of any party.
INTELLECTUAL PROPERTY RIGHTS
ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve
the use of a claimed Intellectual Property Right. ITU takes no position concerning the evidence, validity or
applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside of
the Recommendation development process.
As of the date of approval of this Recommendation, ITU had received notice of intellectual property, protected
by patents, which may be required to implement this Recommendation. However, implementers are cautioned
that this may not represent the latest information and are therefore strongly urged to consult the TSB patent
database at http://www.itu.int/ITU-T/ipr/.
© ITU 2019
All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior
written permission of ITU.
vi Rec. ITU-T T.800 (06/2019)
© ISO/IEC 2024 – All rights reserved

CONTENTS
Page
1 Scope . 1
2 References . 1
2.1 Identical Recommendations | International Standards . 1
2.2 Additional references . 1
3 Definitions. 2
4 Abbreviations and symbols . 6
4.1 Abbreviations . 6
4.2 Symbols . 7
5 General description . 8
5.1 Purpose . 8
5.2 Codestream . 8
5.3 Coding principles. 9
6 Encoder requirements . 10
7 Decoder requirements . 10
7.1 Codestream syntax requirements . 11
7.2 Optional file format requirements . 11
8 Implementation requirements . 11
Annex A – Codestream syntax . 12
A.1 Markers, marker segments and headers . 12
A.2 Information in the marker segments . 14
A.3 Construction of the codestream . 15
A.4 Delimiting markers and marker segments . 19
A.5 Fixed information marker segment . 20
A.6 Functional marker segments . 26
A.7 Pointer marker segments . 36
A.8 In-bit-stream marker and marker segments . 40
A.9 Informational marker segments .
...