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ISO/IEC 29794-4:2017

(Main)

Information technology — Biometric sample quality — Part 4: Finger image data

Information technology — Biometric sample quality — Part 4: Finger image data

ISO/IEC 29794-4:2017 establishes - terms and definitions for quantifying finger image quality, - methods used to quantify the quality of finger images, and - standardized encoding of finger image quality, for finger images at 196,85 px/cm spatial sampling rate scanned or captured using optical sensors with capture dimension (width, height) of at least 1,27 cm × 1,651 cm.

Technologies de l'information — Qualité d'échantillon biométrique — Partie 4: Données d'image de doigt

General Information

Status
Published
Publication Date
20-Sep-2017
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
9599 - Withdrawal of International Standard
Completion Date
30-Sep-2024
Ref Project

Relations

Revised
ISO/IEC 29794-4:2024 - Information technology — Biometric sample quality — Part 4: Finger image data
Effective Date
06-Jun-2022
Revises
ISO/IEC TR 29794-4:2010 - Information technology — Biometric sample quality — Part 4: Finger image data
Effective Date
22-Sep-2012

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ISO/IEC 29794-4:2017 - Information technology -- Biometric sample qualityISO/IEC 29794-4:2017 - Information technology -- Biometric sample quality
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ISO/IEC 29794-4:2017 - Information technology -- Biometric sample quality
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INTERNATIONAL ISO/IEC
STANDARD 29794-4
First edition
2017-09
Information technology — Biometric
sample quality —
Part 4:
Finger image data
Technologies de l'information — Qualité d'échantillon biométrique —
Partie 4: Données d'image de doigt
Reference number
©
ISO/IEC 2017
© ISO/IEC 2017, 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 2017 – All rights reserved

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms, definitions, symbols and abbreviated terms . 1
4 Conformance . 2
5 Finger image quality metrics . 2
5.1 Overview . 2
5.1.1 General. 2
5.1.2 Constituent of local quality metrics . 3
5.1.3 Constituent of global quality metrics . 3
5.1.4 Image preprocessing . 3
5.1.5 Image examples . 5
5.2 Normative contributive quality metrics . 5
5.2.1 General. 5
5.2.2 Orientation certainty level . 5
5.2.3 Local clarity score . 7
5.2.4 Frequency domain analysis (FDA) score .11
5.2.5 Ridge valley uniformity .13
5.2.6 Orientation flow .14
5.2.7 MU .15
5.2.8 MMB .15
5.2.9 Minutiae count in finger image .16
5.2.10 Minutiae count in center of mass region .16
5.2.11 Minutiae quality based on local image mean .16
5.2.12 Minutiae quality based on local orientation certainty level .17
5.2.13 Region of interest image mean .17
5.2.14 Region of interest orientation map coherence sum .19
5.2.15 Region of interest relative orientation map coherence sum .20
5.2.16 Quality feature vector composition .20
5.3 Non-normative quality metrics .23
5.3.1 General.23
5.3.2 Radial power spectrum .23
5.3.3 Gabor quality score .25
5.4 Unified quality score .27
5.4.1 Methodology for combining quality metrics .27
5.4.2 Training method .27
6 Finger image quality data record .28
6.1 Binary encoding .28
6.2 XML encoding .29
6.3 Quality algorithm identifiers .30
Annex A (normative) Conformance test assertions .32
Annex B (informative) Factors influencing fingerprint image character .44
Annex C (informative) Area consideration .46
Bibliography .47
© ISO/IEC 2017 – 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 ISO documents 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 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 Joint Technical Committee ISO/IEC JTC 1, Information technology,
Subcommittee SC 37, Biometrics.
This first edition cancels and replaces ISO/IEC/TR 29794-4:2010, which has been technically revised to
become an International Standard.
A list of all parts in the ISO 29794 series can be found on the ISO website.
iv © ISO/IEC 2017 – All rights reserved

Introduction
This document specifies finger image quality metrics. A reference implementation of the normative
metrics is available at https://github.com/usnistgov/NFIQ2.
The quality of finger image data is defined to be the degree to which the finger image data fulfils
specified requirements for the targeted application. Thus, the quality information is useful in many
applications. ISO/IEC 19784-1 allocates a quality field and specifies the allowable range for the scores,
with a recommendation that the score be divided into four categories with a qualitative interpretation
for each category. Image quality fields are also provided in the fingerprint data interchange formats
standardized in ISO/IEC 19794-2, ISO/IEC 19794-3, ISO/IEC 19794-4, and ISO/IEC 19794-8. This
document defines a standard way to calculate the finger image quality score that facilitates the
interpretation and interchange of the finger image quality scores.
© ISO/IEC 2017 – All rights reserved v

INTERNATIONAL STANDARD ISO/IEC 29794-4:2017(E)
Information technology — Biometric sample quality —
Part 4:
Finger image data
1 Scope
This document establishes
— terms and definitions for quantifying finger image quality,
— methods used to quantify the quality of finger images, and
— standardized encoding of finger image quality,
for finger images at 196,85 px/cm spatial sampling rate scanned or captured using optical sensors with
capture dimension (width, height) of at least 1,27 cm × 1,651 cm.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO/IEC 2382-37, Information technology — Vocabulary — Part 37: Biometrics
ISO/IEC 19794-1:2011, Information technology — Biometric data interchange formats — Part 1:
Framework
ISO/IEC 29794-1, Information technology — Biometric sample quality — Part 1: Framework
3 Terms, definitions, symbols and abbreviated terms
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO/IEC 2382-37, ISO/IEC 29794-
1 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at http://www.iso.org/obp
3.1.1
foreground region
set of all pixels of a finger image that form valid finger image patterns
Note 1 to entry: The most evident structural characteristic of a valid finger image is a pattern of interleaved
ridges and valleys.
© ISO/IEC 2017 – All rights reserved 1

3.1.2
local region
block of m × n pixels of the foreground of a finger image, where m and n are smaller than or equal to the
width and the height of the finger image
3.1.3
finger image quality assessment algorithm
algorithm that reports a quali
...

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