ISO/IEC 15444-2:2021
(Main)Information technology — JPEG 2000 image coding system — Part 2: Extensions
Information technology — JPEG 2000 image coding system — Part 2: Extensions
This document defines a set of lossless (bit-preserving) and lossy compression methods for coding continuous-tone, bi-level, grey-scale, colour digital still images, or multi-component images. This document: – specifies extended decoding processes for converting compressed image data to reconstructed image data; – specifies an extended codestream syntax containing information for interpreting the compressed image data; – specifies an extended file format; – specifies a container to store image metadata; – defines a standard set of image metadata; – provides guidance on extended encoding processes for converting source image data to compressed image data; – provides guidance on how to implement these processes in practice.
Technologies de l'information — Système de codage d'images JPEG 2000 — Partie 2: Extensions
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INTERNATIONAL ISO/IEC
STANDARD 15444-2
Second edition
2021-11
Information technology — JPEG 2000
image coding system —
Part 2:
Extensions
Technologies de l'information — Système de codage d'images JPEG
2000 —
Partie 2: Extensions
Reference number
ISO/IEC 15444-2:2021(E)
© ISO/IEC 2021
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ISO/IEC 15444-2:2021(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO/IEC 2021
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
© ISO/IEC 2021 – All rights reserved
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ISO/IEC 15444-2:2021(E)
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.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO and IEC shall not be held responsible for identifying any or all such patent rights. Details
of any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents) or the IEC list of patent
declarations received (see https://patents.iec.ch).
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 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 second edition cancels and replaces the first edition (ISO/IEC 15444-2:2004), which has been
technically revised. It also incorporates the Amendments ISO/IEC 15444-2:2004/Amd 2:2006,
ISO/IEC 15444-2:2004/Amd 3:2015 and ISO/IEC 15444-2:2004/Amd 4:2015 and the Technical
Corrigenda ISO/IEC 15444-2:2004/Cor 3:2005 and ISO/IEC 15444-2:2004/Cor 4:2007.
The main changes are as follows:
— Annex N ("JPX file format extended metadata definition and syntax") is deprecated;
— the Registration Authority specified in M.7, which was never created or used, is cancelled;
— signalling for HTJ2K codestreams, as specified in Rec. ITU-T T.814 | ISO/IEC 15444-15, is added;
— the RLT marker segment is added;
— references have been revised to their currently in-force editions;
— signalling for codestreams that conform to ISO/IEC 21122-1 is added;
— parameterized colourspace is added to the Colour Specification box;
© ISO/IEC 2021 – All rights reserved iii
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ISO/IEC 15444-2:2021(E)
— outstanding amendments and corrigenda are consolidated; and
— the definition of the CAP marker segment was moved to Rec. ITU-T T.800 (2019) |
ISO/IEC 15444-1:2019.
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.
iv © ISO/IEC 2021 – All rights reserved
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ISO/IEC 15444-2:2021(E)
CONTENTS
Page
1 Scope .
...
FINAL
INTERNATIONAL ISO/IEC
DRAFT
STANDARD FDIS
15444-2
ISO/IEC JTC 1/SC 29
Information technology — JPEG 2000
Secretariat: JISC
image coding system —
Voting begins on:
2021-07-22
Part 2:
Voting terminates on:
Extensions
2021-09-16
Technologies de l'information — Système de codage d'images JPEG
2000 —
Partie 2: Extensions
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
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/IEC FDIS 15444-2:2021(E)
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. ISO/IEC 2021
---------------------- Page: 1 ----------------------
ISO/IEC FDIS 15444-2:2021(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO/IEC 2021
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO/IEC 2021 – All rights reserved
---------------------- Page: 2 ----------------------
ISO/IEC FDIS 15444-2:2021(E)
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 (see www.iso.org/directives or
www.iec.ch/members_experts/refdocs).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO and IEC shall not be held responsible for identifying any or all such patent rights. Details
of any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents) or the IEC list of patent
declarations received (see patents.iec.ch).
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 Rec. ITU-T T.801 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 second edition cancels and replaces the first edition (ISO/IEC 15444-2:2004), which has been
technically revised. It also incorporates the Amendments ISO/IEC 15444-2:2004/Amd 2:2006,
ISO/IEC 15444-2:2004/Amd 3:2015 and ISO/IEC 15444-2:2004/Amd 4:2015 and the Technical
Corrigenda ISO/IEC 15444-2:2004/Cor 3:2005 and ISO/IEC 15444-2:2004/Cor 4:2007.
The main changes compared to the previous edition are as follows:
— signalling for HTJ2K codestreams, as specified in Rec. ITU-T T.814 | ISO/IEC 15444-15, is added;
— the RLT marker segment is added;
— signalling for codestreams that conform to ISO/IEC 21122-1 is added;
— parameterized colourspace is added to the Colour Specification box;
— outstanding amendments and corrigenda are consolidated; and
— the definition of the CAP marker segment is removed, having been moved to Rec. ITU-T T.800
(2019) | ISO/IEC 15444-1:2019.
© ISO 2021 – All rights reserved iii
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ISO/IEC FDIS 15444-2:2021(E)
A list of all par
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