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ISO/IEC 29794-6:2015

(Main)

Information technology — Biometric sample quality — Part 6: Iris image data

Information technology — Biometric sample quality — Part 6: Iris image data

ISO/IEC 29794-6:2015 establishes: methods used to quantify the quality of iris images, normative requirements on software and hardware producing iris images, normative requirements on software and hardware measuring the utility of iris images, terms and definitions for quantifying iris image quality, and standardized encoding of iris image quality. Outside the scope is performance evaluation of specific iris quality assessment algorithms.

Technologies de l'information — Qualité d'échantillon biométrique — Partie 6: Image d'iris

General Information

Status
Published
Publication Date
02-Jul-2015
ICS
35.040 - Information coding
35.240.15 - Identification cards. Chip cards. Biometrics
Technical Committee
ISO/IEC JTC 1/SC 37 - Biometrics
Drafting Committee
ISO/IEC JTC 1/SC 37/WG 3 - Biometric data interchange formats
Current Stage
9093 - International Standard confirmed
Start Date
23-Jul-2021
Completion Date
19-Apr-2025
Ref Project
ISO/IEC 29794-6:2015 - Information technology -- Biometric sample qualityISO/IEC 29794-6:2015 - Information technology -- Biometric sample quality
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ISO/IEC 29794-6:2015 - Information technology -- Biometric sample quality
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Standards Content (Sample)


INTERNATIONAL ISO/IEC
STANDARD 29794-6
First edition
2015-07-01
Information technology — Biometric
sample quality —
Part 6:
Iris image data
Technologies de l’information — Qualité d’échantillon biométrique —
Partie 6: Image d’iris
Reference number
©
ISO/IEC 2015
© ISO/IEC 2015, Published in Switzerland
All rights reserved. Unless otherwise specified, 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
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO/IEC 2015 – All rights reserved

Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Conformance . 1
3 Normative references . 2
4 Terms and definitions . 2
5 Acronyms and abbreviated terms. 3
6 Iris image quality metrics . 3
6.1 General . 3
6.2 Required iris image quality metrics computed from a single image . 4
6.2.1 Usable iris area . 4
6.2.2 Iris-sclera contrast . 5
6.2.3 Iris-pupil contrast . 6
6.2.4 Pupil boundary circularity . 7
6.2.5 Grey scale utilisation . 8
6.2.6 Iris radius . 8
6.2.7 Pupil dilation . 9
6.2.8 Iris pupil concentricity . 9
6.2.9 Margin adequacy.10
6.2.10 Sharpness .12
6.3 Recommended iris image quality metrics computed from a single image .13
6.3.1 Frontal gaze–elevation .13
6.3.2 Frontal gaze-azimuth .13
6.3.3 Motion blur .15
6.4 Iris image quality metrics computed from two images .15
6.4.1 Common usable iris area .15
6.4.2 Dilation constancy .15
6.4.3 Illumination similarity .16
6.5 Unified (overall) quality score .16
6.5.1 General.16
6.5.2 Computational method.16
7 Iris acquisition quality .17
7.1 General .17
7.2 Dedicated illumination .17
7.2.1 Description . . .17
7.2.2 Units of measure .17
7.2.3 Computational method.18
7.2.4 Value range/threshold .18
7.3 Modulation transfer function .18
7.3.1 Description . . .18
7.3.2 Units of measure .18
7.3.3 Computational method.18
7.3.4 Value range/threshold .18
7.4 Spatial sampling rate .18
7.4.1 Description . . .18
7.4.2 Units of measure .19
7.4.3 Computational method.19
7.4.4 Value range/threshold .19
7.5 Optical distortion .19
7.6 Pixel aspect ratio .19
7.6.1 Description . . .19
7.6.2 Units of measure .19
© ISO/IEC 2015 – All rights reserved iii

7.6.3 Computational method.19
7.6.4 Value range/threshold .19
7.7 Sensor signal-to-noise ratio .19
7.7.1 Description . . .19
7.7.2 Units of measure .19
7.7.3 Computational method.20
7.7.4 Value range/threshold .20
8 Iris image quality data record .20
8.1 Binary encoding .20
8.2 XML encoding .22
Annex A (normative) Conformance test assertions .24
Annex B (informative) Iris image quality .25
Bibliography .29
iv © ISO/IEC 2015 – All rights reserved

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 pat
...

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