ISO/IEC 39794-5:2019
(Main)Information technology — Extensible biometric data interchange formats — Part 5: Face image data
Information technology — Extensible biometric data interchange formats — Part 5: Face image data
This document specifies: — generic extensible data interchange formats for the representation of face 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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General Information
Standards Content (Sample)
INTERNATIONAL ISO/IEC
STANDARD 39794-5
First edition
2019-12
Information technology — Extensible
biometric data interchange formats —
Part 5:
Face image data
Reference number
ISO/IEC 39794-5:2019(E)
©
ISO/IEC 2019
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ISO/IEC 39794-5:2019(E)
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ISO/IEC 39794-5:2019(E)
Contents Page
Foreword .vi
Introduction .vii
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Abbreviated terms . 7
5 Conformance . 8
6 Modality specific information . 9
7 Abstract data elements . 9
7.1 Overview . 9
7.1.1 Content and notation . 9
7.1.2 Structure overview .10
7.1.3 Data conventions .11
7.2 Face image data block .11
7.3 Version block .11
7.4 Representation block .12
7.5 Representation identifier .12
7.6 Capture date/time block . .12
7.7 Quality blocks .12
7.8 PAD data block.12
7.9 Session identifier.12
7.10 Derived from .13
7.11 Capture device block .13
7.12 Model identifier block .13
7.13 Certification identifier blocks.13
7.14 Identity metadata block .13
7.15 Gender .14
7.16 Eye colour .14
7.17 Hair colour .15
7.18 Subject height .15
7.19 Properties block .16
7.20 Expression block .16
7.21 Pose angle block .17
7.22 Angle data block .18
7.23 Angle value .18
7.24 Angle uncertainty .18
7.25 Landmark block .19
7.26 Landmark kind .19
7.27 MPEG4 feature point .19
7.28 Anthropometric landmark .22
7.29 Landmark coordinates block .25
7.30 Image representation block .26
7.31 2D image representation block .26
7.32 2D representation data .26
7.33 2D capture device block .26
7.34 2D capture device spectral block .26
7.35 2D capture device technology identifier .27
7.36 2D image information block .27
7.37 2D face image kind.27
7.38 Post acquisition processing block .28
7.39 Lossy transformation attempts .28
7.40 Image data format .29
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ISO/IEC 39794-5:2019(E)
7.41 Camera to subject distance .31
7.42 Sensor diagonal .31
7.43 Lens focal length .32
7.44 Image size block .32
7.45 Width .32
7.46 Height .32
7.47 Image face measurements block .32
7.48 Image head width .33
7.49 Image inter-eye distance .33
7.50 Image eye-to-mouth distance .34
7.51 Image head length .34
7.52 Image colour space .35
7.53 Reference colour mapping block .35
7.54 Reference colour schema .35
7.55 Reference colour definition and value block .35
7.56 3D shape representation block .35
7.57 3D representation data .36
7.58 3D capture device block .36
7.59 3D modus .36
7.60 3D capture device technology identifier .36
7.61 3D image information block .37
7.62 3D representation kind block.37
7.63 3D vertex block .37
7.64 3D vertex information block .37
7.65 3D vertex coordinate block .37
7.66 3D vertex identifier .38
7.67 3D vertex normals block .38
7.68 3D vertex textures block .38
7.69 3D error map .38
7.70 3D vertex triangle data block.39
7.71 3D coordinate system .39
7.72 3D Cartesian coordinate system .39
7.73 3D Cartesian scales and offsets block.40
7.74 3D face image kind.41
7.75 3D physical face measurements block .41
7.76 3D physical head width .41
7.77 3D physical inter-eye distance .42
7.78 3D physical eye-to-mouth distance .42
7.79 3D physical head length .42
7.80 3D textured image resolution block .42
7.81 3D MM shape [X/Y/Z] resolution .42
7.82 3D MM texture resolution .42
7.83 3D texture acquisition period .42
7.84 3D face area scanned block .43
7.85 3D texture map block .43
7.86 3D texture capture device spectral block .43
7.87 3D texture standard illuminant .44
7.88 3D texture map data .44
8 Encoding .44
8.1 Overview .44
8.2 Tagged binary encoding .45
8.3 XML encoding .46
9 Registered BDB format identifiers .47
Annex A (normative) Formal specifications .48
Annex B (informative) Encoding examples .80
Annex C (normative) Conformance testing methodology .88
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ISO/IEC 39794-5:2019(E)
Annex D (normative) Application profiles .101
Annex E (informative) Additional technical considerations .154
Bibliography .184
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ISO/IEC 39794-5:2019(E)
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.
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ISO/IEC 39794-5:2019(E)
Introduction
Face images have been used for many decades to verify the identity of individuals. In recent years,
digital face images have been used in many applications including human examination as well as
computer-automated face recognition. Photographic formats are standardized, e.g., for passports
and driver licences. There is also a need for a standard data format for digital face images to enable
interoperability. A prominent case where such interoperability is essential is the electronic passport
system, where face images are stored for several purposes including Automated Border Control.
Biometric data interchange formats enable the interoperability of different biometric systems. The
first generation of biometric data interchange formats was published between 2005 and 2007 in the
first edition of the ISO/IEC 19794 series. From 2011 onwards, the second generation of biometric data
interchange formats was published in the second edition of the established parts and the first edition
of some new parts of the ISO/IEC 19794 series. In the second generation of biometric data interchange
formats, new useful data elements such as data elements related to biometric sample quality were
added, the header data structures were harmonized across all parts of the ISO/IEC 19794 series, and
XML encoding was been added in addition to the binary encoding.
In anticipation of the need for additional data elements, and in order to avoid future compatibility
issues, the ISO/IEC 39794 series provides standard biometric data interchange formats capable of
being extended in a defined way. Extensible specifications in ASN.1 (Abstract Syntax Notation One) and
the distinguished encoding rules (DER) of ASN.1 form the basis for encoding biometric data in binary
tag-length-value formats. XSDs (XML schema definitions) form the basis for encoding biometric data in
XML (eXtensible Markup Language).
This third generation of face image data interchange formats complements ISO/IEC 19794-5:2005 and
ISO/IEC 19794-5:2011. The first generation of biometric data interchange formats, which has been
adopted, e.g., by ICAO for the biometric data stored in Machine Readable Travel Documents, is expected
to be retained in the standards catalogue as long as needed.
This document is intended to provide a generic face image data format for face recognition applications
requiring exchange of face image data. Typical applications are:
— automated face biometric verification (one-to-one comparison) and identification (one-to-many
comparison), and
— human verification of a biometric claim by comparison of data subjects against face images, including
examination of face images with sufficient detail.
In addition to the data format, this document specifies application specific profiles including scene
constraints, photographic properties and digital image attributes like image spatial sampling rate,
image size, etc. These application profiles are contained in Annex D.
The structure of the data format in this document is not compatible with the previous generations.
However, this new revision addresses, for the first time, a mechanism to maintain future extensions in a
backwards- and forwards-compatible manner. This will mean that a parser is able to read data records
and understand data items that are formatted according to versions of the standard that are older, the
same or newer than the parser is developed to. All newer data items will not disrupt the parsing process
and can be ignored. Newer versions of this document will at least include the mandatory data items of
the previous standards.
The 3D encoding types 3D point map and range image are not supported by this edition of this
document.
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INTERNATIONAL STANDARD ISO/IEC 39794-5:2019(E)
Information technology — Extensible biometric data
interchange formats —
Part 5:
Face image data
1 Scope
This document specifies:
— generic extensible data interchange formats for the representation of face image data: A tagged
binary data format based on an extensible specification in ASN.1 and a textual data
...
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