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1、BRITISH STANDARD BS ISO/IEC 19794-7:2007 Information technology Biometric data interchange formats Part 7: Signature/sign time series data ICS 35.040 ? Licensed Copy: London South Bank University, London South Bank University, Mon Jul 16 04:13:17 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BS ISO/IEC
2、 19794-7:2007 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 July 2007 BSI 2007 ISBN 978 0 580 54242 8 National foreword This British Standard is the UK implementation of ISO/IEC 19794-7:2007. The UK participation in its preparation was e
3、ntrusted to Technical Committee IST/44, Biometrics. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Complianc
4、e with a British Standard cannot confer immunity from legal obligations. Amendments issued since publication Amd. No. DateComments Licensed Copy: London South Bank University, London South Bank University, Mon Jul 16 04:13:17 GMT+00:00 2007, Uncontrolled Copy, (c) BSI Reference number ISO/IEC 19794-
5、7:2007(E) INTERNATIONAL STANDARD ISO/IEC 19794-7 First edition 2007-06-15 Information technology Biometric data interchange formats Part 7: Signature/sign time series data Technologies de linformation Formats dchange de donnes biomtriques Partie 7: Donnes de srie chronologique de signature/signe BS
6、ISO/IEC 19794-7:2007 Licensed Copy: London South Bank University, London South Bank University, Mon Jul 16 04:13:17 GMT+00:00 2007, Uncontrolled Copy, (c) BSI ii Licensed Copy: London South Bank University, London South Bank University, Mon Jul 16 04:13:17 GMT+00:00 2007, Uncontrolled Copy, (c) BSI
7、iii 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 channe
8、ls: 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 head
9、er . 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 forma
10、ts 17 Annex C (informative) Signature/sign coding examples 21 Bibliography. 23 BS ISO/IEC 19794-7:2007 Licensed Copy: London South Bank University, London South Bank University, Mon Jul 16 04:13:17 GMT+00:00 2007, Uncontrolled Copy, (c) BSI iv Foreword ISO (the International Organization for Standar
11、dization) 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 organizatio
12、n 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, IS
13、O 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
14、 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 pa
15、tent 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 titl
16、e 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
17、 9: Vascular image data Part 10: Hand geometry silhouette data The following part is under preparation: Part 11: Signature/sign processed dynamic data BS ISO/IEC 19794-7:2007 Licensed Copy: London South Bank University, London South Bank University, Mon Jul 16 04:13:17 GMT+00:00 2007, Uncontrolled C
18、opy, (c) BSI 1 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 behavioura
19、l 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-specifi
20、c 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 to
21、kens 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 appli
22、cation-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
23、 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 sp
24、ecified 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 doc
25、ument (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 R
26、egistration Authority BS ISO/IEC 19794-7:2007 Licensed Copy: London South Bank University, London South Bank University, Mon Jul 16 04:13:17 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 2 ISO/IEC 19785-3, Information technology Common Biometric Exchange Formats Framework Part 3: Patron format specific
27、ations 1) 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 person
28、al 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 ti
29、me 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 measur
30、ed 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
31、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 p
32、ublished. BS ISO/IEC 19794-7:2007 Licensed Copy: London South Bank University, London South Bank University, Mon Jul 16 04:13:17 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 3 Figure 1 Azimuth and elevation angles (upper left), tilt angles (upper right), pen orientation decomposition (lower left), and
33、 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 fro
34、m 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 t
35、he Y (vertical) direction 4.14 Z resolution number of dots per centimetre that the capture device resolves in the Z direction BS ISO/IEC 19794-7:2007 Licensed Copy: London South Bank University, London South Bank University, Mon Jul 16 04:13:17 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 4 4.15 sampl
36、ing 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 downwards force of the pen tip on the writing plane 5 Conventions 5.1 Coordinate system The coordinate system used to express the pen pos
37、ition shall be a three-dimensional Cartesian coordinate system. The x axis shall be the horizontal axis of the writing plane, with x coordinates increasing to the right. The y axis shall be the vertical axis of the writing plane, with y coordinates increasing upwards. The z axis shall be the axis pe
38、rpendicular to the writing plane, with z coordinates increasing upwards out of the writing plane starting from 0. 5.2 Octet order The more significant octets of any multi-octet quantity are stored at lower addresses in memory than (and are transmitted before) less significant octets. Within an octet
39、, the bits are numbered from 8 to 1, where bit 8 is the most significant bit (MSB) and bit 1 the least significant bit (LSB). 5.3 Registered format type identifiers The biometric data block (BDB) specified in this part of ISO/IEC 19794 shall be embedded in a CBEFF- compliant structure. The structure
40、 of a signature/sign time series biometric information record (BIR) is depicted in Figure 2. CBEFF standard biometric header Signature/sign time series data block header Signature/sign time series data block ? Signature/sign time series data block body CBEFF security block Figure 2 Overview of a sig
41、nature/sign time series BIR NOTE The CBEFF security block holds data that enables the integrity and/or the originator of the signature/ sign time series BIR to be verified (electronic signature or message authentication code (MAC). A CBEFF standard biometric header includes the data elements format
42、owner and format type. Format owner and format type shall be encoded according to ISO/IEC 19785 (CBEFF). The format owner is ISO/IEC JTC 1/SC 37 with the IBIA registered format owner identifier 257 (0101Hex). The registrations listed in Table 1 have been made with the CBEFF Registration Authority (s
43、ee ISO/IEC 19785-2) to identify the signature/sign time series full format and the signature/sign time series compact format. BS ISO/IEC 19794-7:2007 Licensed Copy: London South Bank University, London South Bank University, Mon Jul 16 04:13:17 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 5 Table 1 Fo
44、rmat type identifiers CBEFF BDB format type identifier Short name Full object identifier 14 (000eHex) signature-sign- time-series-full iso(1) registration-authority(1) cbeff(19785) organizations(0) 257 bdbs(0) signature-sign-time-series-full(14) 15 (000fHex) signature-sign- time-series-compact iso(1
45、) registration-authority(1) cbeff(19785) organizations(0) 257 bdbs(0) signature-sign-time-series-compact(16) 6 Channels 6.1 General Table 2 lists the channel names and their meanings. Signature/sign behavioural data captured with different capture devices or used in different applications may contai
46、n data from different channels. Inclusion of the X and Y channels is mandatory. Either the T channel or the DT channel must be present, or uniform sampling (constant time difference between adjacent sample points) must be indicated. Inclusion of the other channels is optional. Table 2 Channels Chann
47、el name Interpretation X x coordinate (horizontal pen position) Y y coordinate (vertical pen position) Z z coordinate (height of pen above the writing plane) VX velocity in x direction VY velocity in y direction AX acceleration in x direction AY acceleration in y direction T time DT time difference
48、F pen tip force (pressure) S tip switch state (touching/not touching the writing plane) TX tilt along the x axis TY tilt along the y axis Az azimuth angle of the pen (yaw) El elevation angle of the pen (pitch) R rotation (rotation about the pen axis) 6.2 Pen position channels: X, Y, Z There are 3 ch
49、annels defined for recording pen position data in the three-dimensional space. The horizontal and vertical pen position in the writing plane is recorded in the X and Y channels, respectively. The height of the pen above the writing plane is recorded in the Z channel. The unit of measurement is metres (m). To restore the actual values, the integer values given in the BDB body are to be divided by a scaling value given in the BDB heade