ISO/IEC 39794-4:2019
(Main)Information technology — Extensible biometric data interchange formats — Part 4: Finger image data
Information technology — Extensible biometric data interchange formats — Part 4: Finger image data
This document specifies: — generic extensible data interchange formats for the representation of friction ridge image data: a tagged binary data format based on an extensible specification in ASN.1 and a textual data format based on an XML schema definition that are both capable of holding the same information; — examples of data record contents; — application specific requirements, recommendations, and best practices in data acquisition; and — conformance test assertions and conformance test procedures applicable to this document.
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INTERNATIONAL ISO/IEC
STANDARD 39794-4
First edition
2019-12
Information technology — Extensible
biometric data interchange formats —
Part 4:
Finger image data
Reference number
©
ISO/IEC 2019
© ISO/IEC 2019
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO/IEC 2019 – All rights reserved
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Abbreviated terms . 5
5 Conformance . 6
6 Modality specific information . 6
6.1 Capture recommendations . 6
6.1.1 Fingerprint image . 6
6.1.2 Palm image . 6
6.2 Image coordinate system considerations . 7
6.3 Image representation requirements . 7
6.3.1 General. 7
6.3.2 Colorspace . 7
6.3.3 Pixel aspect ratio . 7
6.3.4 Bit-depth . 8
6.3.5 Image spatial sampling rate . 8
7 Abstract data elements . 8
7.1 Purpose and overall structure . 8
7.2 Finger image data block . 9
7.3 Version block . 9
7.4 Representation blocks .10
7.5 Position .10
7.6 Impression .10
7.7 Image data format .11
7.7.1 Supported data format .11
7.7.2 PGM encoding definition .11
7.8 Image data .12
7.9 Capture date/time block . .12
7.10 Capture device block .12
7.10.1 Model identifier block .12
7.10.2 Capture device technology identifier .12
7.10.3 Certification identifier blocks .13
7.11 Quality blocks .14
7.12 Spatial sampling rate block .14
7.13 Position computed by capture device .14
7.14 Original rotation .14
7.15 Image rotated to vertical .14
7.16 Image has been lossily compressed .14
7.17 Segmentation blocks .15
7.18 Annotation blocks .15
7.19 PAD data block.15
7.20 Comment blocks .16
7.21 Vendor specific data blocks .16
8 Encoding .16
8.1 Tagged binary encoding .16
8.2 XML encoding .16
9 Registered BDB format identifiers .16
Annex A (normative) Formal specifications .17
© ISO/IEC 2019 – All rights reserved iii
Annex B (informative) Encoding examples .29
Annex C (normative) Conformance testing methodology .33
Annex D (normative) Capture device certifications .38
Annex E (informative) Conditions for capturing fingerprint image data .62
Annex F (normative) WSQ greyscale finger image compression specification .71
Bibliography .97
iv © ISO/IEC 2019 – 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.
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).
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 http:// patents .iec .ch).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www .iso .org/
iso/ foreword .html.
This document was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology,
Subcommittee SC 37, Biometrics.
A list of all parts in the ISO/IEC 39794 series can be found on the ISO website.
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.
The purchase of this ISO/IEC document carries a copyright licence for the purchaser to use ISO/IEC
copyright in the schemas in the annexes to this document for the purpose of developing, implementing,
installing and using software based on those schemas, subject to ISO/IEC licensing conditions set out in
the schemas.
© ISO/IEC 2019 – All rights reserved v
Introduction
Biometric data interchange formats enable the interope
...
INTERNATIONAL ISO/IEC
STANDARD 39794-4
First edition
2019-12
Information technology — Extensible
biometric data interchange formats —
Part 4:
Finger image data
Reference number
©
ISO/IEC 2019
© ISO/IEC 2019
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO/IEC 2019 – All rights reserved
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Abbreviated terms . 5
5 Conformance . 6
6 Modality specific information . 6
6.1 Capture recommendations . 6
6.1.1 Fingerprint image . 6
6.1.2 Palm image . 6
6.2 Image coordinate system considerations . 7
6.3 Image representation requirements . 7
6.3.1 General. 7
6.3.2 Colorspace . 7
6.3.3 Pixel aspect ratio . 7
6.3.4 Bit-depth . 8
6.3.5 Image spatial sampling rate . 8
7 Abstract data elements . 8
7.1 Purpose and overall structure . 8
7.2 Finger image data block . 9
7.3 Version block . 9
7.4 Representation blocks .10
7.5 Position .10
7.6 Impression .10
7.7 Image data format .11
7.7.1 Supported data format .11
7.7.2 PGM encoding definition .11
7.8 Image data .12
7.9 Capture date/time block . .12
7.10 Capture device block .12
7.10.1 Model identifier block .12
7.10.2 Capture device technology identifier .12
7.10.3 Certification identifier blocks .13
7.11 Quality blocks .14
7.12 Spatial sampling rate block .14
7.13 Position computed by capture device .14
7.14 Original rotation .14
7.15 Image rotated to vertical .14
7.16 Image has been lossily compressed .14
7.17 Segmentation blocks .15
7.18 Annotation blocks .15
7.19 PAD data block.15
7.20 Comment blocks .16
7.21 Vendor specific data blocks .16
8 Encoding .16
8.1 Tagged binary encoding .16
8.2 XML encoding .16
9 Registered BDB format identifiers .16
Annex A (normative) Formal specifications .17
© ISO/IEC 2019 – All rights reserved iii
Annex B (informative) Encoding examples .29
Annex C (normative) Conformance testing methodology .33
Annex D (normative) Capture device certifications .38
Annex E (informative) Conditions for capturing fingerprint image data .62
Annex F (normative) WSQ greyscale finger image compression specification .71
Bibliography .97
iv © ISO/IEC 2019 – 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.
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).
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 http:// patents .iec .ch).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www .iso .org/
iso/ foreword .html.
This document was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology,
Subcommittee SC 37, Biometrics.
A list of all parts in the ISO/IEC 39794 series can be found on the ISO website.
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.
The purchase of this ISO/IEC document carries a copyright licence for the purchaser to use ISO/IEC
copyright in the schemas in the annexes to this document for the purpose of developing, implementing,
installing and using software based on those schemas, subject to ISO/IEC licensing conditions set out in
the schemas.
© ISO/IEC 2019 – All rights reserved v
Introduction
Biometric data interchange formats enable the interope
...
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