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AS ISO/IEC 39794.2:2024

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AS ISO/IEC 39794.2:2024

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Information technology – Extensible biometric data interchange formats, Part 2: Finger minutiae data

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AS ISO/IEC 39794.2:2024 identically adopts ISO/IEC 39794 2:2023, which specifies generic extensible data interchange formats for the representation of finger minutia data and provides related information.

Table of contents
Header
About this publication
Preface
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and abbreviated terms
5 Conformance
6 Modality-specific information
6.1 Purpose
6.2 Minutia description
6.3 Minutia kind
6.3.1 General
6.3.2 Unique minutia
6.3.3 Encoding trifurcations
6.4 Minutia location
6.4.1 General
6.4.2 Coordinate system
6.4.3 Minutia location of a ridge ending (encoded as valley skeleton bifurcation point)
6.4.4 Minutia location of a ridge bifurcation
6.4.5 Minutia location of a ridge ending (encoded as ridge skeleton endpoint)
6.4.6 Usage of the minutia placement
6.5 Minutiae direction
6.5.1 Angle conventions
6.5.2 Minutia direction of a ridge ending (encoded as valley skeleton bifurcation point)
6.5.3 Minutia direction of a ridge bifurcation
6.5.4 Minutia direction of a ridge ending (encoded as ridge skeleton endpoint)
6.6 Core and delta placement
7 Abstract data elements
7.1 Purpose
7.2 Finger minutiae data
7.3 Version
7.4 Representation block
7.5 Position
7.6 Impression
7.7 Minutiae data
7.8 Spatial sampling rate
7.9 Ridge end encoding
7.10 Capture date and time
7.11 Capture device
7.11.1 Capture device model identifier
7.11.2 Certification identifier blocks
7.11.3 Certification schemes for finger images
7.11.4 Capture device technology identifier
7.12 Biometric sample quality blocks
7.13 Generic ridge counts
7.14 Four neighbour ridge counts
7.15 Eight neighbour ridge counts
7.16 Core data
7.17 Delta data
7.18 Zonal quality
7.19 PAD data block
7.20 Vendor specific data
8 Encoding
8.1 Tagged binary encoding
8.2 XML encoding
8.3 On-card biometric comparison format
8.3.1 Overview
8.3.2 Minutia placement
8.3.3 Encoding
8.3.4 Minutia position
8.3.5 Minutia type
8.3.6 Minutia angle
8.3.7 Number of minutiae and truncation
8.3.7.1 General aspects
8.3.7.2 Removing minutiae for card processing
8.3.7.3 Lack of minutiae
8.3.8 Usage of extended data for the on-card comparison format
8.3.8.1 Data objects for extended data
8.3.8.2 Ridge count data format
8.3.8.2.1 Ridge count extraction method
8.3.8.2.1.1 Eight-neighbour ridge count extraction method
8.3.8.2.1.2 Four-neighbour ridge count extraction method
8.3.8.2.2 Ridge count data
8.3.8.2.3 Ridge count format summary
8.3.8.3 Core and delta data format
8.3.8.3.1 General
8.3.8.3.2 Core information
8.3.8.3.2.1 Number of cores
8.3.8.3.2.2 Core information type
8.3.8.3.2.3 Core position
8.3.8.3.2.4 Core angle
8.3.8.3.3 Delta information
8.3.8.3.3.1 Number of deltas
8.3.8.3.3.2 Delta information type
8.3.8.3.3.3 Delta position
8.3.8.3.3.4 Delta angles
8.3.8.3.4 Core and delta format summary
8.3.8.4 Zonal quality data modified for on-card comparison minutiae formats
8.3.8.4.1 Zonal quality data format summary
8.3.8.4.2 Density of cells in the quality map
8.3.8.4.3 Quality map width and height
8.3.8.4.4 Cell quality information depth
8.3.8.4.5 Cell quality data
8.3.8.5 Impression type
8.3.9 Biometric comparison parameters
8.3.9.1 Number of minutiae
8.3.9.2 Minutiae order
8.3.9.2.1 Data object for minutiae ordering
8.3.9.2.2 Ordered ascending
8.3.9.2.3 Ordered descending
8.3.9.2.4 Cartesian X-Y
8.3.9.2.5 Cartesian Y-X
8.3.9.2.6 Angle
8.3.9.2.7 Polar
8.3.9.2.8 X or Y coordinate extension
8.3.9.3 Indication of card capabilities
9 Registered format type identifiers
Annex A
A.1 ASN.1 module for tagged binary encoding
A.2 XML schema definition for XML encoding
Annex B
B.1 Overview
B.2 Conformance test assertions
Annex C
C.1 Sample ASN.1 encoding for finger minutia data
C.2 Sample XML encoding for finger minutia data
Annex D
D.1 General
D.2 Minutiae detection strategy
D.2.1 Overview: “Liberal-conservative” spectrum
D.2.2 Fingerprint boundary
D.2.3 Sweat pore
D.2.4 Touching ridges
D.2.5 Incipient ridge
D.2.6 Crease
D.2.7 Core
D.2.8 Delta
D.3 Minutia characteristics
D.3.1 Rationale
D.3.2 Minutia type
D.3.3 Minutia location tools
D.3.3.1 Consideration of the spatial sampling rate of the underlying finger image
D.3.3.2 Skeletonization
D.3.3.3 Image skeletonization
D.3.3.4 Ridge flow direction
D.3.3.5 Ridge gradient method
D.3.3.6 Minutia location at a ridge skeleton endpoint
D.3.3.7 Minutia location at a ridge skeleton bifurcation point
D.3.3.8 Minutia location at a valley skeleton bifurcation point
D.3.3.9 Minutia direction at a ridge skeleton endpoint
D.3.3.10 Minutia direction at a ridge skeleton bifurcation point
D.3.3.11 Minutia direction at a valley skeleton bifurcation point
D.3.4 Valley skeletal bifurcation method
D.3.4.1 Minutia location at a valley skeleton bifurcation
D.3.4.2 Minutia location at a ridge skeleton bifurcation
D.3.4.3 Angle of a ridge ending
D.3.4.4 Angle of a ridge bifurcation
D.3.5 Minutia quality
D.4 Sample image
Bibliography

Cited references in this standard
Content history
DR AS ISO/IEC 39794.2:2024

Please select a variation to view its description.

Published

06/09/2024
Pages

80

Please select a variation to view its pdf.

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AS ISO/IEC 39794.2:2024
$275.61