ISO/IEC 19794-7:2007
(Main)Information technology — Biometric data interchange formats — Part 7: Signature/sign time series data
Information technology — Biometric data interchange formats — Part 7: Signature/sign time series data
ISO/IEC 19794-7:2007 specifies two data interchange formats for signature/sign behavioural data captured in the form of time series using devices such as digitizing tablets or advanced pen systems. One data interchange format is for general use and the other one is a compact format for use with smart cards or other tokens. Both data interchange formats can be used for both acquired signature/sign samples (serving as a starting point for feature extraction) and for time-series features (to be compared directly by time-series based comparison algorithms). Abstract syntax notation one (ASN.1) specifications of the data interchange formats and encoding instructions are provided in an informative annex.
Technologies de l'information — Formats d'échange de données biométriques — Partie 7: Données de série chronologique de signature/signe
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Standards Content (Sample)
INTERNATIONAL ISO/IEC
STANDARD 19794-7
First edition
2007-06-15
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 2007
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ii © ISO/IEC 2007 – All rights reserved
Contents Page
Foreword. iv
1 Scope . 1
2 Conformance. 1
3 Normative references . 1
4 Terms and definitions. 2
5 Conventions . 4
5.1 Coordinate system. 4
5.2 Octet order. 4
5.3 Registered format type identifiers . 4
6 Channels. 5
6.1 General. 5
6.2 Pen position channels: X, Y, Z . 5
6.3 Pen velocity channels: VX, VY . 6
6.4 Pen acceleration channels: AX, AY . 6
6.5 Time channel: T. 6
6.6 Time difference channel: DT. 6
6.7 Pen tip force channel: F . 6
6.8 Tip switch state channel: S. 6
6.9 Pen orientation channels: TX, TY, Az, El, R . 6
7 Full format . 7
7.1 Introduction . 7
7.2 BDB organisation. 7
7.3 BDB header . 7
7.4 BDB body. 11
8 Compact format . 12
8.1 Introduction . 12
8.2 Matching algorithm parameters template . 13
8.3 Embedment in a CBEFF data structure. 14
8.4 BDB body. 15
Annex A (informative) Best practices — Data acquisition. 16
Annex B (informative) ASN.1 specification of the data interchange formats . 17
Annex C (informative) Signature/sign coding examples. 21
Bibliography . 23
© ISO/IEC 2007 – 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.
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 19794-7 was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology,
Subcommittee SC 37, Biometrics.
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
The following part is under preparation:
⎯ Part 11: Signature/sign processed dynamic data
iv © ISO/IEC 2007 – All rights reserved
INTERNATIONAL STANDARD ISO/IEC 19794-7:2007(E)
Information technology — Biometric data interchange
formats —
Part 7:
Signature/sign time series data
1 Scope
For the purposes of biometric verification and/or identification, this part of ISO/IEC 19794 specifies a concept
and data interchange formats for dynamic signature/sign behavioural data captured in the form of a time
series using devices such as digitizing tablets or advanced pen systems. The data interchange formats are
generic in that they may be applied and used in a wide range of application areas where handwritten signs or
signatures are involved. No application-specific requirements or features are addressed in this part of
ISO/IEC 19794. This part of ISO/IEC 19794 contains definitions of relevant terms, a description of what data is
captured, two data formats for containing the data — one for general use and one compact format for use with
smart cards and other tokens — alongside examples of data block contents and best practice in capture.
Specifying which of the format types and which options defined in this part of ISO/IEC 19794 are to be applied
in a particular application is out of the scope of this part of ISO/IEC 19794; this needs to be defined in
application-specific requirements specifications or application profiles. It is advisable that stored and
transmitted biometric data be time-stamped and that cryptographic techniques be used to protect their
authenticity, integrity and confidentiality; however such provisions are beyond the scope of this part of
ISO/IEC 19794.
2 Conformance
A biometric data block conforms to this part of ISO/IEC 19794 if it satisfies the format requirements with
respect to its structure, with respect to relations among its fields, and with respect to relations between its
fields and the underlying input that are specified within the normative clauses of this part of ISO/IEC 19794.
3 Normative references
The following referenced documents are indispensable for the application 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 19785-1, Information technology — Common Biometric Exchange Formats Framework — Part 1:
Data element specification
ISO/IEC 19785-2, Information technology — Common Biometric Exchange Formats Framework — Part 2:
Procedures for the operation of the Biometric Registration Authority
© ISO/IEC 2007 – All rights reserved 1
ISO/IEC 19785-3, Information technology — Common Biometric Exchange Formats Framework — Part 3:
1)
Patron format specifications
ISO/IEC 19794-1, Information technology — Biometric data interchange formats — Part 1: Framework
4 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO/IEC 19794-1 and the following apply.
4.1
signature/sign
handwritten signature or handwritten personal sign
4.2
time series
sequence of values sampled at successive points in time
4.3
biometric data block
BDB
block of data with a defined format that contains one or more biometric samples or biometric templates
4.4
channel
data item (acquired, intermediate or processed) recorded in the form of a time series
NOTE Examples include pen position, pen tip force and tilt.
4.5
pen azimuth
angle measured clockwise from the positive y axis to the perpendicular projection of the pen onto the writing
plane
NOTE For an illustration, see Figure 1 (upper left and lower left).
4.6
pen elevation
angle measured counter-clockwise from the perpendicular projection of the pen onto the writing plane to the
pen
NOTE For an illustration, see Figure 1 (upper left and lower left).
4.7
pen tilt along the x axis
angle measured clockwise from the positive z axis to the perpendicular projection of the pen onto the
x,z plane
NOTE For an illustration, see Figure 1 (upper right and lower left).
4.8
pen tilt along the y axis
angle measured clockwise from the positive z axis to the perpendicular projection of the pen onto the
y,z plane
NOTE For an illustration, see Figure 1 (upper right and lower left).
1) To be published.
2 © ISO/IEC 2007 – All rights reserved
Figure 1 — Azimuth and elevation angles (upper left), tilt angles (upper right),
pen orientation decomposition (lower left), and pen rotation (lower right)
4.9
pen rotation
angle of rotation of the pen about its longitudinal axis measured counter-clockwise from a device-specific
reference rotational position
NOTE For an illustration, see Figure 1 (lower right).
4.10
X jitter
standard deviation of 100 x-coordinate samples from a stationary pen
4.11
Y jitter
standard deviation of 100 y-coordinate samples from a stationary pen
4.12
X resolution
number of dots per centimetre that the capture device resolves in the X (horizontal) direction
4.13
Y resolution
number of dots per centimetre that the capture device resolves in the Y (vertical) direction
4.14
Z resolution
number of dots per centimetre that the capture device resolves in the Z direction
© ISO/IEC 2007 – All rights reserved 3
4.15
sampling rate
rate in samples per second at which channel values are recorded
4.16
F resolution
number of units per millinewton that the capture device resolves in the down
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