ISO/IEC 15938-14:2018

Information technology — Multimedia content description interface — Part 14: Reference software, conformance and usage guidelines for compact descriptors for visual search

ISO/IEC 15938-14:2018 provides the reference software, specifies the conformance testing, and gives usage guidelines for ISO/IEC 15938‑13.

Technologies de l'information — Interface de description du contenu multimédia — Partie 14: Logiciels de référence, conformité et lignes directrices pour l'utilisation des descripteurs compacts pour recherche visuelle

General Information

• Status: Published
• Publication Date: 06-Feb-2018
• ICS: 35.040 - Information coding
• ICS: 35.040.40 - Coding of audio, video, multimedia and hypermedia 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: 9060 - Close of review
• Completion Date: 02-Sep-2028

Standards Content (Sample)

INTERNATIONAL ISO/IEC
STANDARD 15938-14
First edition
2018-02
Information technology — Multimedia
content description interface —
Part 14:
Reference software, conformance
and usage guidelines for compact
descriptors for visual search
Technologies de l'information — Interface de description du contenu
multimédia —
Partie 14: Logiciels de référence, conformité et lignes directrices pour
l'utilisation des descripteurs compacts pour recherche visuelle
Reference number
©
ISO/IEC 2018
© ISO/IEC 2018, Published in Switzerland
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
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ii © ISO/IEC 2018 – All rights reserved

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and abbreviated terms . 2
4.1 General . 2
4.2 Abbreviations . 2
4.3 Arithmetic operations . 2
4.4 Logical operators . 2
4.5 Relational operators . 3
4.6 Bitwise operators. 3
4.7 Assignment . 3
4.8 Set operators . 3
4.9 Constants . 3
4.10 Functions . 4
5 Reference software . 4
5.1 Reference software location . 4
5.2 Reference software license . 4
5.3 Reference software documentation . 4
5.4 Reference software compilation . 4
5.5 Reference software architecture . 4
6 Conformance testing . 5
6.1 Conformance image data set and reference CDVS bitstreams . 5
6.2 Conformance test conditions . 5
6.2.1 General. 5
6.2.2 Global descriptor test . 6
6.2.3 Interest point test . 6
6.2.4 Local descriptor test . 6
7 Usage guidelines . 7
7.1 Overview . 7
7.2 Pairwise matching . 7
7.2.1 Overview . 7
7.2.2 Global descriptor matching . 8
7.2.3 Local descriptors matching . 8
7.2.4 Image match decision .11
7.2.5 Homography estimation for localization .13
7.3 Retrieval .14
7.3.1 Overview .14
7.3.2 Shortlist generation . .14
7.3.3 Geometric reranking . .15
© ISO/IEC 2018 – All rights reserved iii

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. In the field of information technology, ISO and IEC have established a joint technical committee,
ISO/IEC JTC 1.
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. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
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).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on 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 the following
URL: www .iso .org/ iso/ foreword .html.
This document was prepared by ISO/IEC JTC 1, Information technology, Subcommittee SC 29, Coding of
audio, picture, multimedia and hypermedia information.
A list of all parts in the ISO/IEC 15938 series can be found on the ISO website.
iv © ISO/IEC 2018 – All rights reserved

Introduction
ISO/IEC 15938 (all parts) also known as “Multimedia Content Description Interface,” provides a
standardized set of technologies for describing multimedia content. It addresses a broad spectrum of
multimedia applications and requirements by providing a metadata system for describing the features
of multimedia content.
The following are specified in ISO/IEC 15938 (all parts).
— Description schemes (DS) describe entities or relationships pertaining to multimedia content.
Description schemes specify the structure and semantics of their components, which may be
Description Schemes, descriptors, or datatypes.
— Descriptors (D) describe features, attributes, or groups of attributes of multimedia content.
— Datatypes are the basic reusable datatypes employed by description schemes and descriptors
— Systems tools support delivery of descriptions, multiplexing of descriptions with multimedia
content, synchronization, file format, and so forth.
ISO/IEC 15938 consists of 14 parts.
— Part 1 – Systems: specifies the tools for preparing descriptions for efficient transport and storage,
compressing descriptions, and allowing synchronization between content and descriptions.
— Part 2 – Description definition language: specifies the language for defining the International
Standard set of description tools (DSs, Ds, and datatypes) and for defining new description tools.
— Part 3 – Visual: specifies the description tools pertaining to visual content.
— Part 4 – Audio: specifies the description tools pertaining to audio content.
— Part 5 – Multimedia description schemes: specifies the generic description tools pertaining to
multimedia including audio and visual content.
— Part 6 – Reference software: provides a software implementation of ISO/IEC 15938.
— Part 7 – Conformance testing: specifies the guidelines and procedures for testing conformance of
implementations of ISO/IEC 15938.
— Part 8 – Extraction and use of MPEG-7 descriptions: provides guidelines and examples of the
extraction and use of descriptions.
— Part 9 – Profiles and levels: provides guidelines and standard profiles.
— Part 10 – Schema definition: specifies the schema using description definition language.
— Part 11 – Profile Schemas: listing of profile schemas using description definition language.
— Part 12 – Query format: contains the tools of the MPEG Query Format (MPQF).
— Part 13 – Compact descriptors for visual search: specifies an image description tool for visual
search applications.
— Part 14 – Reference software, conformance and usage guidelines for compact descriptors for
visual search: provides the reference software, specifies the conformance testing, and gives usage
guidelines for compact descriptors for visual search.
The compact descriptors for visual search (CDVS) tool specified in ISO/IEC 15938-13 is designed to
enable efficient and interoperable visual search applications, allowing visual content matching in
images. Visual content matching includes matching of views of objects, landmarks, and printed
© ISO/IEC 2018 – All rights reserved v

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