ISO/IEC 19794-7:2021

INTERNATIONAL ISO/IEC
STANDARD 19794-7
Third edition
2021-10
Information technology — Biometric
data interchange formats —
Part 7:
Signature/sign time series data
Technologies de l'information — Formats d'échange de données
biométriques —
Partie 7: Données de série chronologique de signature/signe
Reference number
© ISO/IEC 2021
© ISO/IEC 2021
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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© ISO/IEC 2021 – All rights reserved

Contents Page
Foreword .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Abbreviated terms . 3
5 Conformance . 4
6 Conventions . 4
6.1 Coordinate system . 4
6.2 Octet and bit order . 5
6.3 Registered format type identifiers . 5
7 Channels . 5
7.1 General . 5
7.2 Pen tip position channels: X, Y, Z . 6
7.3 Pen tip velocity channels: VX, VY . 6
7.4 Pen tip acceleration channels: AX, AY . 6
7.5 Time channel: T . 6
7.6 Time difference channel: DT . 7
7.7 Pen tip force channel: F . 7
7.8 Pen tip switch state channel: S . 7
7.9 Pen orientation channels: TX, TY, A, E, R . 7
8 Binary full format . 8
8.1 Record organization . 8
8.2 General header . 11
8.2.1 Structure . 11
8.2.2 Format identifier . 11
8.2.3 Version number . 11
8.2.4 Length of the data record . 11
8.2.5 Number of representations . 11
8.2.6 Certification flag . 11
8.3 Record body . 12
8.3.1 Structure .12
8.3.2 Representation header .12
8.3.3 Representation body . 17
9 Binary compact format .17
9.1 Record organization . 17
9.2 Comparison algorithm parameters template . 18
9.2.1 Structure . 18
9.2.2 Minimum and maximum number of sample points . 18
9.2.3 Channel descriptions . 19
9.3 Embedment in a CBEFF data structure . 20
9.4 Record body . 20
10 Binary compression format .20
10.1 Record organization . 20
10.2 General header . 21
10.3 Record body . 21
10.3.1 Structure . 21
10.3.2 Representation header . 21
10.3.3 Representation body . 24
11 XML encoding .25
Annex A (normative) Conformance testing methodology .26
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© ISO/IEC 2021 – All rights reserved

Annex B (informative) Best practices — Data acquisition .71
Annex C (informative) ASN.1 specification of the binary compact format .72
Annex D (informative) Binary signature/sign encoding examples .75
Annex E (normative) XML schema definition .77
Annex F (informative) XML signature/sign encoding example .81
Bibliography .84
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© ISO/IEC 2021 – 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
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work.
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 or
www.iec.ch/members_experts/refdocs).
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) or the IEC
list of patent declarations received (see patents.iec.ch).
Any trade name used in this document is information given for the convenience of users and does not
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For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
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the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see
www.iso.org/iso/foreword.html. In the IEC, see www.iec.ch/understanding-standards.
This document was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology,
Subcommittee SC 37, Biometrics.
This third edition cancels and replaces the second edition (ISO/IEC 19794-7:2014), which has been
technically revised. It also incorporates the Amendment ISO/IEC 19794-7:2014/Amd 1:2015.
The main changes are as follows:
— inclusion of ISO/IEC 19794-7:2014/Amd 1:2015, XML encoding, and correction of technical defects
therein.
A list of all parts in the ISO/IEC 19794 series can be found on the ISO and IEC websites.
Any feedback or questions on this document should be directed to the user’s national standards
body. A complete listing of these bodies can be found at www.iso.org/members.html and
www.iec.ch/national-committees.
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© ISO/IEC 2021 – All rights reserved

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