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ISO/IEC 19794-8:2011

(Main)

Information technology — Biometric data interchange formats — Part 8: Finger pattern skeletal data

Information technology — Biometric data interchange formats — Part 8: Finger pattern skeletal data

ISO/IEC 19794-8:2011 describes all characteristics of a fingerprint in a small data record. Thus it allows for the extraction of both spectral information (orientation, frequency, phase, etc.) and features (minutiae, core, ridge count, etc.). Transformations like translation and rotation can also be accommodated by the format defined in ISO/IEC 19794-8:2011. ISO/IEC 19794-8:2011 supports the proliferation of low-cost commercial fingerprint sensors with limited coverage, dynamic range, or resolution. Thus, it defines a data record that can be used to store biometric information on a variety of storage mediums (including, but not limited to, portable devices and smart cards).

Technologies de l'information — Formats d'échange de données biométriques — Partie 8: Données des structures du squelette de l'empreinte

General Information

Status
Published
Publication Date
13-Dec-2011
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 - Biometrics
Current Stage
9093 - International Standard confirmed
Completion Date
06-Sep-2024
Ref Project

Relations

Amended By
ISO/IEC 19794-8:2011/Amd 1:2014 - Information technology — Biometric data interchange formats — Part 8: Finger pattern skeletal data — Amendment 1: Conformance testing methodology
Effective Date
28-Aug-2021
Corrected By
ISO/IEC 19794-8:2011/Cor 1:2012 - Information technology — Biometric data interchange formats — Part 8: Finger pattern skeletal data — Technical Corrigendum 1
Effective Date
11-Dec-2021
Revises
ISO/IEC 19794-8:2006/Cor 1:2011 - Information technology — Biometric data interchange formats — Part 8: Finger pattern skeletal data — Technical Corrigendum 1
Effective Date
03-Sep-2011
Revises
ISO/IEC 19794-8:2006 - Information technology — Biometric data interchange formats — Part 8: Finger pattern skeletal data
Effective Date
15-Apr-2008

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ISO/IEC 19794-8:2011 - Information technology -- Biometric data interchange formats
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INTERNATIONAL ISO/IEC
STANDARD 19794-8
Second edition
2011-12-15
Information technology — Biometric data
interchange formats —
Part 8:
Finger pattern skeletal data
Technologies de l'information — Formats d'échange de données
biométriques —
Partie 8: Données des structures du squelette de l'empreinte

Reference number
©
ISO/IEC 2011
©  ISO/IEC 2011
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or
ISO's member body in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO/IEC 2011 – 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 Abbreviated terms .2
6 Determination of finger pattern skeletal data.2
6.1 Minutia .3
6.1.1 Minutia type.3
6.1.2 Minutia location and coordinate system.3
6.1.3 Angle conventions .4
6.1.4 Differences to minutia data in ISO/IEC 19794-2 – Finger minutia data .5
6.2 Encoding the skeleton ridge line by a direction code .5
6.2.1 Direction code.5
6.2.2 General skeleton line encoding rules.7
6.2.3 Constructing direction elements .7
6.2.4 Direction element length.8
6.3 Skeleton line neighbourhood index .10
6.3.1 Adjacent lines .10
6.3.2 Recording the neighbour indices .10
7 Finger pattern skeletal data record format .11
7.1 Introduction.11
7.1.1 Pattern record format summary.11
7.2 Record organization.14
7.3 General header .14
7.3.1 Format identifier .14
7.3.2 Version number .14
7.3.3 Length of total record .14
7.3.4 Number of finger representations .14
7.3.5 Certification flag .14
7.4 Single finger record format .15
7.4.1 Finger Pattern Skeletal Representation Header.15
7.4.2 Finger pattern skeletal data block .19
7.5 Extended data .20
7.5.1 Common extended data fields .20
7.5.2 Ridge count data format .21
7.5.3 Core and delta data format.23
7.5.4 Zonal quality data .25
7.5.5 Sweat pore position data.26
7.5.6 Finger pattern skeleton structural data.27
8 Finger pattern skeletal data card format.29
8.1 Normal size finger pattern skeletal format.29
8.2 Compact size finger pattern skeletal format.29
8.3 Finger pattern skeletal data block .30
8.3.1 Skeleton image size in x and y.30
8.3.2 Length of finger pattern skeletal data .30
8.3.3 Finger pattern skeletal data.30
© ISO/IEC 2011 – All rights reserved iii

8.3.4 Length of skeleton line neighbourhood index data .30
8.3.5 Skeleton line neighbourhood index data .30
8.4 The x or y coordinate extension for compact card format.30
8.5 Usage of additional features for the card format .31
8.6 Comparison parameters and card capabilities.31
8.6.1 Maximal data size.32
8.6.2 Indication of card capabilities .32
8.7 Pattern card format summary.32
9 CBEFF format owner and format types.33
Annex A (normative) Conformance test methodology.34
Annex B (normative) Capture device certifications.35
Annex C (informative) Examples for finger pattern skeletal data .59
Annex D (informative) Example data record.66
Bibliography .68

iv © ISO/IEC 2011 – 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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of the joint technical committee is to prepare International Standards. Draft International
Standards adopted by the joint technical committee are circulated to national bodies for voting. Publication as
an International Standard requires approval by at least 75 % of the national bodies casting a vote.
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.
ISO/IEC 19794-8 was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology,
Subcommittee SC 37, Biometrics.
This second edition cancels and replaces the first edition (ISO/IEC 19794-8:2006), Clauses 6, 7 and 8 and
Annex B of which have been technically revised. It also incorporates the Technical Corrigendum
ISO/IEC 19794-8:2006/Cor.1:2011.
ISO/IEC 19794 consists of the following parts, under the general title Information technology — Biometric data
interchange formats:
⎯ Part 1: Framework
⎯ Part 2: Finger minutiae data
⎯ Part 3: Finger pattern spectral data
⎯ Part 4: Finger image data
⎯ Part 5: Face image data
⎯ Part 6: Iris image data
⎯ Part 7: Signature/sign time series data
⎯ Part 8: Finger pattern skeletal data
⎯ Part 9: Vascular image data
⎯ Part 10: Hand geometry silhouette data
⎯ Part 11: Signature/sign processed dynamic data
The following parts are under preparation:
⎯ Part 13: Voice data
⎯ Part 14: DNA data
© ISO/IEC 2011 – All rights reserved v

Introduction
With the interest of implementing interoperable personal biometric recognition systems, this part of
ISO/IEC 19794 establishes a data interchange format for pattern-based skeletal fingerprint recognition
algorithms. Pattern-based algorithms process sections of biometric images. Pattern-based algorithms have
been shown to work well with the demanding, but commercially driven, fingerprint sensor formats such as
small-area and swipe sensors.
The exchange format defined in this part of ISO/IEC 19794 describes all characteristics of a fingerprint in a
small data record. Thus it allows for the extraction of both spectral information (orientation, frequency, phase,
etc.) and features (minutiae, core, ridge count, etc.). Transformations like translation and rotation can also be
accommodated by the format defined in this part of ISO/IEC 19794.
With this part of ISO/IEC 19794 for pattern-based skeletal representation of fingerprints:
⎯ interoperability among fingerprint recognition vendors based on a small data record is allowed;
⎯ proliferation of low-cost commercial fingerprint sensors with limited coverage, dynamic range, or
resolution is supported;
⎯ a data record that can be used to store biometric information on a variety of storage mediums (including,
but not limited to, portable devices and smart cards) is defined;
⎯ adoption of biometrics in applications requiring interoperability is encouraged.
Note that it is recommended that biometric data protection techniques in ANSI X9.84 or ISO/IEC 15408 be
used to safeguard the biometric data defined in this part of ISO/IEC 19794 for confidentiality, integrity and
availability.
vi © ISO/IEC 2011 – All rights reserved

INTERNATIONAL STANDARD ISO/IEC 19794-8:2011(E)

Information technology — Biometric data interchange
formats —
Part 8:
Finger pattern skeletal data
1 Scope
This part of ISO/IEC 19794 specifies the interchange format for the exchange of p
...

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