ISO/IEC 15444-15:2019

INTERNATIONAL ISO/IEC
STANDARD 15444-15
First edition
2019-10
Information technology — JPEG 2000
image coding system —
Part 15:
High-Throughput JPEG 2000
Technologies de l'information — Système de codage d'images JPEG
2000 —
Partie 15: JPEG 2000 à haut débit
Reference number
©
ISO/IEC 2019
© ISO/IEC 2019
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ii © ISO/IEC 2019 – All rights reserved

Foreword
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This document was prepared by ITU‐T as ITU‐T T.814 (06/2019) and drafted in accordance with its
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Subcommittee SC 29, Coding of audio, picture, multimedia and hypermedia information.
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© ISO/IEC 2019 – All rights reserved iii

INTERNATIONAL STANDARD ISO/IEC 15444-15
RECOMMENDATION ITU-T T.814
Information technology – JPEG 2000 image coding system: High-throughput JPEG 2000
Summary
The computational complexity of the block-coding algorithm of Rec. ITU-T T.800 | ISO/IEC 15444-1 can be a challenge
in some applications.
Rec. ITU-T T.814 | ISO/IEC 15444-15 specifies a high-throughput (HT) block-coding algorithm that can be used in place
of the block-coding algorithm specified in Rec. ITU-T T.800 | ISO/IEC 15444-1.
The HT block-coding algorithm increases decoding and encoding throughput and allows mathematically lossless
transcoding to and from the block-coding algorithm specified in Rec. ITU-T T.800 | ISO/IEC 15444-1. This is achieved at
the expense of some loss in coding efficiency and substantial elimination of quality scalability.
The HT block-coding algorithm adopts a coding pass structure like that of the block-coding algorithm of Rec. ITU-T T.800
| ISO/IEC 15444-1. No more than three coding passes are required for any given code-block in the final codestream, and
arithmetic coding is replaced with a combination of variable length coding tools, adaptive run-length coding and simple
bit-packing. The algorithm involves three passes: a significance propagation pass (HT SigProp coding pass), a magnitude
refinement pass (HT MagRef coding pass) and a cleanup pass (HT cleanup coding pass).
The HT MagRef coding pass is identical to that of the block-coding algorithm of Rec. ITU-T T.800 | ISO/IEC 15444-1,
operating in the bypass mode, except that code bits are packed into bytes with a little-endian bit order. That is, the first
code bit in a byte appears in its LSB, as opposed to its MSB.
The HT SigProp coding pass is also very similar to that of the block-coding algorithm of Rec. ITU-T T.800 | ISO/IEC
15444-1, operating in the BYPASS mode, with the following two differences:
• code bits are again packed into bytes of the raw bit-stream with a little-endian bit order, instead of big-
endian bit packing order; and
• the significance bits associated with a set of four stripe columns are emitted first, followed by the associated
sign bits, before advancing to the next set of stripe columns, instead of inserting any required sign bit
immediately after the same sample's magnitude bit.
The HT cleanup coding pass is, however, significantly different from that of the block-coding algorithm of Rec. ITU-T
T.800 | ISO/IEC 15444-1, and most of ITU-T T.814 | ISO/IEC 15444-15 is devoted to its description.
Aside from the block-coding algorithm itself and the parsing of packet headers, the HT block-coding algorithm preserves
the syntax and semantics of other parts of the codestream specified in Rec. ITU-T T.800 | ISO/IEC 15444-1.
Recommendation ITU-T T.814 (2019) is a common text with ISO/IEC 15444-15:2019, both in their first edition.
History
*
Edition Recommendation Approval Study Group Unique ID
1.0 ITU-T T.814 2019-06-13 16 11.1002/1000/13912
*
To access the Recommendation, type the URL http://handle.itu.int/ in the address field of your web browser, followed
by the Recommendation's unique ID. For example, http://handle.itu.int/11.1002/1000/11830-en.
© ISO/IEC 2019 – All rights reserved
Rec. ITU-T T.814 (06/2019) i
FOREWORD
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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
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telecommunication administration and a recognized operating agency.
Compliance with this Recommendation is voluntary. However, the Recommendation may contain certain
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INTELLECTUAL PROPERTY RIGHTS
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that this may not represent the latest information and are therefore strongly urged to consult the TSB patent
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 ITU 2019
All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior
written permission of ITU.
© ISO/IEC 2019 – All rights reserved
ii Rec. ITU-T T.814 (06/2019)
CONTENTS
Page
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Abbreviations and symbols . 1
5 Convention . 2
6 Conformance . 2
6.1 HTJ2K codestream . 2
6.2 HTJ2K decoding algorithm . 2
6.3 JPH file . 3
7 HT block decoding algorithm . 3
7.1 Retrieving bit-streams from HT segments . 3
7.2 Quad-based scanning pattern . 9
7.3 HT Cleanup decoding algorithm . 10
7.4 HT SigProp decoding procedure . 20
7.5 HT MagRef decoding procedure . 22
7.6 Sample output values . 22
8 Constrained codestream sets . 23
8.1 Overview . 23
8.2 HTONLY, HTDECLARED and MIXED sets . 23
8.3 SINGLEHT and MULTIHT sets . 23
8.4 RGN and RGNFREE sets . 23
8.5 HOMOGENEOUS and HETEROGENEOUS sets . 23
8.6 LOCAL and FRAG sets . 24
8.7 Bounded magnitude sets . 24
8.8 CPF sets . 25
N
9 Media types . 26
(normative) – HTJ2K codestream syntax . 27
A.1 General . 27
A.2 SIZ marker segment . 27
A.3 CAP marker segment . 27
A.4 COD and COC marker segments . 29
A.5 RGN marker segment . 30
A.6 Corresponding Profile (CPF) marker segment . 30
(normative) – HT data organization . 32
B.1 HT Sets . 32
B.2 HT segments .
...