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1、BRITISH STANDARD BS ISO/IEC 19794-6:2005 Information technology Biometric data interchange formats Part 6: Iris image data ICS 35.040 ? Licensed Copy: London South Bank University, London South Bank University, Mon Jan 22 07:45:03 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BS ISO/IEC 19794-6:2005 Th
2、is British Standard was published under the authority of the Standards Policy and Strategy Committee on 29 July 2005 BSI 29 July 2005 ISBN 0 580 46456 3 National foreword This British Standard reproduces verbatim ISO/IEC 19794-6:2005 and implements it as the UK national standard. The UK participatio
3、n in its preparation was entrusted to Technical Committee IST/44, Biometrics, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international publications referred
4、 to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provision
5、s of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or
6、proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the ISO/IEC title page, pages ii to v, a blank page, pages 1 to 25 and a back co
7、ver. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments Licensed Copy: London South Bank University, London South Bank University, Mon Jan 22 07:45:03 GMT+00:00 2007, Uncontrolled Copy, (c) BSI Re
8、ference number ISO/IEC 19794-6:2005(E) INTERNATIONAL STANDARD ISO/IEC 19794-6 First edition 2005-06-01 Information technology Biometric data interchange formats Part 6: Iris image data Technologies de linformation Formats dchange de donnes biomtriques Partie 6: Donnes dimage de liris BS ISO/IEC 1979
9、4-6:2005 Licensed Copy: London South Bank University, London South Bank University, Mon Jan 22 07:45:03 GMT+00:00 2007, Uncontrolled Copy, (c) BSI ii Licensed Copy: London South Bank University, London South Bank University, Mon Jan 22 07:45:03 GMT+00:00 2007, Uncontrolled Copy, (c) BSI ContentsPage
10、 Foreword.iv Introductionv 1 Scope.1 2 Conformance.1 3 Normative references .1 4 Terms and definitions.1 5 Symbols and abbreviated terms3 6 Iris image format specification 3 6.1 General 3 6.2 Image compression 3 6.2.1 General 3 6.2.2 Raw format 4 6.2.3 Lossless compression format .4 6.2.4 Compressed
11、 format4 6.3 Image pre-processing.4 6.3.1 Rectilinear image pre-processing4 6.3.2 Polar image pre-processing.4 6.4 Iris image biometric data block.6 6.5 Iris header structures .8 6.5.1 Iris record header structure .8 6.5.2 Iris biometric subtype header structure8 6.5.3 Iris image header structure8 6
12、.5.4 Header constants11 Annex A (informative) Iris image capture.13 A.1 Image quality.13 A.1.1 General 13 A.1.2 Unacceptable quality13 A.1.3 Low quality13 A.1.4 Medium quality13 A.1.5 High quality .14 A.1.6 Focus quality.14 A.2 Greyscale density .14 A.3 Illumination14 A.4 Contrast.15 A.5 Visible iri
13、s15 A.6 Pixel aspect ratio 15 A.7 Image scale15 A.8 Optical distortion 16 A.9 Noise16 A.10 Image orientation16 A.11 Presentation17 Annex B (informative) Sample image data records 18 B.1 Rectilinear data record sample, single eye, single image .18 B.2 Rectilinear data record sample, multiple eyes, mu
14、ltiple images.19 B.3 Polar image biometric data block, single eye, single image .22 Bibliography.25 iii BS ISO/IEC 19794-6:2005 Licensed Copy: London South Bank University, London South Bank University, Mon Jan 22 07:45:03 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BS ISO/IEC 19794-6:2005 Foreword I
15、SO (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 commit
16、tees 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 wo
17、rk. 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 St
18、andards. 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. ISO/IEC 19794-6 was prepared by Joint Technical Committee I
19、SO/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:
20、Finger image data ? Part 5: Face image data ? Part 6: Iris image data The following parts are under preparation: ? Part 7: Signature/sign behavioral data ? Part 8: Finger pattern skeletal data iv Licensed Copy: London South Bank University, London South Bank University, Mon Jan 22 07:45:03 GMT+00:00
21、 2007, Uncontrolled Copy, (c) BSI v Introduction The purpose of this document is to define a standard for exchange of iris image information. This part of ISO/IEC 19794 contains a specific definition of attributes, a data record format for storing and transmitting the iris image and certain attribut
22、es, a sample record, and conformance criteria. Currently, exchange of iris information between equipment from different vendors can only be done using a large-scale image of the entire eye. This is expensive in storage and bandwidth. To provide interoperability among vendors, it is necessary to defi
23、ne a standard, compact representation of a human iris. The biometric data record specified in this part of ISO/IEC 19794 shall be embedded in a CBEFF-compliant structure in the CBEFF Biometric Data Block (BDB). The International Organization for Standardization (ISO) and the International Electrotec
24、hnical Commission (IEC) draw attention to the fact that it is claimed that compliance with this document may involve the use of patents concerning iris recognition given in Clause 6 and/or Annex A. The ISO and IEC take no position concerning the evidence, validity and scope of this patent right. The
25、 hol derof this patent right has assured the ISO and IEC that he/she is willing to negotiate licenses under r easonabl e and non-discriminatory terms and conditions with applicants throughout the world. In this r espect ,t he st at em entof the holder of this patent right is registered with ISO and
26、IEC. Information may be Iridian, Technologies, Inc. Mr. Robert Levin Corporate Counsel 1245 N. Church Street Moorestown, NJ 08057 USA Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights other than those identified above. ISO and IEC sh
27、all not be held responsible for identifying any or all such patent rights. BS ISO/IEC 19794-6:2005 obt ai nedf r om : Licensed Copy: London South Bank University, London South Bank University, Mon Jan 22 07:45:03 GMT+00:00 2007, Uncontrolled Copy, (c) BSI blank Licensed Copy: London South Bank Unive
28、rsity, London South Bank University, Mon Jan 22 07:45:03 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 1 1 Scope This part of ISO/IEC 19794 specifies two alternative image interchange formats for biometric authentication systems that utilize iris recognition. or a compressed format such as that specifi
29、ed by ISO/IEC 15444. The second format is based on a polar image specification that requires certain pre-processing and image segmentation steps, but produces a much more compact data structure that contains only iris information. Data that comply with either one of the iris image formats specified
30、in this part of ISO/IEC 19794 are intended to be embedded in a CBEFF-compliant structure in the CBEFF Biometric Data Block (BDB) as specified in ISO/IEC 19785-1. 2 Conformance Conformity with this part of ISO/IEC 19794 requires compliance with one of the data formats described in clause 6. Recommend
31、ed image quality criteria described in Annex A are expressed in terms of resolution, contrast, noise level, etc. Because iris recognition applications may have varying image quality requirements, four different levels of image quality are defined in Annex A. In general, the highest image quality lev
32、el is recommended for high-volume, high-security applications where the lowest possible recognition error rates are required. Lower levels of image quality are appropriate for less demanding applications in which higher error rates can be tolerated but camera cost is a critical factor. 3 Normative r
33、eferences 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
34、 Common biometric exchange formats framework Part 1: Data ISO/IEC 10918 (all parts), Information technology Digital compression and coding of continuous-tone still images ISO/IEC 15444 (all parts), Information technology JPEG 2000 image coding system ISO/IEC 14495 (all parts), Information technology
35、 Lossless and near-lossless compression of continuous- tone still images Information technology Biometric data interchange formats Part 6: Iris image data The f i r st i s based on a r ect i l i near i m age st or age f or m at t hat m ay be a r aw,uncom pr essed ar r ay of i nt ensi t y val ues ele
36、ment specification ISO/IEC 19794- 1, Information technology Biometric data interchange formats Part 1: Framework BS ISO/IEC 19794-6:2005 Licensed Copy: London South Bank University, London South Bank University, Mon Jan 22 07:45:03 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 2 4.1 binary large object
37、 BLOB large block of binary data, typically an image or video file, that may have to be handled in a special way 4.2 continuous tone image image whose components have more than one bit per sample 4.3 crop reduce the size of an image by removing unimportant parts of it, typically the outer regions 4.
38、4 grey scale continuous-tone image that has one component, which is luminance 4.5 iris coloured annular ring in the front portion of the eye comprised of muscular and connective tissue and pigment cells that defines and controls the central opening of the pupil 4.6 limbus outer boundary of the iris
39、where it is joined to the sclera 4.7 line pair lp measure of spatial feature content, which when associated with a fixed distance measurement provides an estimate of spatial frequency 4.8 pixel single picture element, one of an n by m matrix of picture elements where m is the number of columns and n
40、 is the number of rows 4.9 pupil opening in the centre of the eye that serves as a variable light aperture and defines the inner boundary of the iris 4.10 raw image file format in which the image is stored in the same format in which it is stored in video memory, typically one byte (for monochrome i
41、mages) per picture element or three bytes (for color images) per picture element 4.11 resolution number of picture elements (pixels) per unit distance in the object plane or image plan, specified as the number of pixels per millimetre at the object plane, that is on the eye 4.12 round mathematical f
42、unction applied to a number x such that round(x) is the integer that is closest in value to x 4 Terms and definitions For the purposes of this document, the terms and definitions given in ISO/IEC 19794-1 and the following apply. BS ISO/IEC 19794-6:2005 Licensed Copy: London South Bank University, Lo
43、ndon South Bank University, Mon Jan 22 07:45:03 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 3 4.13 sclera white outer covering of the eye peripheral to the iris 5 Symbols and abbreviated terms 5.1 JPEG compression standard for continuous-tone images ISO/IEC 10918 5.2 JPEG2000 enhanced compression sta
44、ndard ISO/IEC 15444 5.3 JPEG-LS lossless/near-lossless compression standard for continuous-tone images ISO/IEC 14495 6 Iris image format specification 6.1 General The iris image format specification defines header and data structures that support storage of the iris image in rectilinear or polar coo
45、rdinates. The biometric data record specified in this part of ISO/IEC 19794 shall be embedded in a CBEFF-compliant structure in the CBEFF Biometric Data Block (BDB) as specified in ISO/IEC 19785-1. The CBEFF_BDB_format_owner assigned by the CBEFF Registration Authority to JTC1 SC37 in accordance wit
46、h ISO/IEC 19785-2 shall be used. This is the sixteen-bit value 0x0101 (hexadecimal 101 or 257 decimal). It is recommended that iris image data transmitted or stored in accordance with this part of ISO/IEC 19794 be encrypted and signed to protect privacy and integrity of the data. The CBEFF structure
47、 supports such encryption and signing. One of the two following CBEFF_BDB_format_type values shall be used in the CBEFF Header. The sixteen- bit value 0x0009 shall be used for records that represent the iris image in rectilinear coordinates and the sixteen-bit value 0x000B shall be used for records
48、that represent the iris image in polar coordinates. These CBEFF_BDB_format_type values have been registered in accordance with ISO/IEC 19785-2. The CBEFF_BDB_biometric_type value may be used in the CBEFF Header. If used, the value entered shall be the type value assigned to iris by the patron format
49、. The CBEFF_BDB_biometric_subtype value may be used in the CBEFF Header if the iris data record contains data from only one eye. If used, the value entered shall be 0x00 to indicate that no information is given, 0x01 to indicate right eye, and 0x02 to indicate left eye. 6.2 Image compression 6.2.1 General The iris image shall be transmitted and stored in one of several possible formats described in the following subclauses. BS ISO/IEC 19794-6:2005 Licensed