kSIST-TS FprCEN/TS 18214:2025
(Main)ISO/IEC 39794-4 application profile for finger image data in machine-readable travel documents
ISO/IEC 39794-4 application profile for finger image data in machine-readable travel documents
The eighth edition of ICAO Doc 9303 progresses from using the first edition of the ISO/IEC 19794 series for encoding biometric reference data in electronic machine-readable travel documents to using the ISO/IEC 39794 series for this purpose. This document specifies how to use ISO/IEC 39794-4 for finger-print image data stored in electronic machine-readable travel documents.
Anwendungsprofil nach ISO/IEC 39794-4 für Fingerabdrucksbilder in maschinenlesbaren Reisedokumenten
Profil uporabe po ISO/IEC 39794-4 za podatke o slikah prstnih odtisov v strojno berljivih potovalnih dokumentih
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
01-oktober-2025
Profil uporabe po ISO/IEC 39794-4 za podatke o slikah prstnih odtisov v strojno
berljivih potovalnih dokumentih
ISO/IEC 39794-4 application profile for finger image data in machine-readable travel
documents
Anwendungsprofil nach ISO/IEC 39794-4 für Fingerabdrucksbilder in maschinenlesbaren
Reisedokumenten
Ta slovenski standard je istoveten z: FprCEN/TS 18214
ICS:
35.240.15 Identifikacijske kartice. Čipne Identification cards. Chip
kartice. Biometrija cards. Biometrics
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
FINAL DRAFT
TECHNICAL SPECIFICATION
SPÉCIFICATION TECHNIQUE
TECHNISCHE SPEZIFIKATION
August 2025
ICS 35.240.15
English Version
ISO/IEC 39794-4 application profile for finger image data
in machine-readable travel documents
Anwendungsprofil nach ISO/IEC 39794-4 für
Fingerabdrucksbilder in maschinenlesbaren
Reisedokumenten
This draft Technical Specification is submitted to CEN members for Vote. It has been drawn up by the Technical Committee
CEN/TC 224.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.
Warning : This document is not a Technical Specification. It is distributed for review and comments. It is subject to change
without notice and shall not be referred to as a Technical Specification.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. FprCEN/TS 18214:2025 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Symbols and abbreviated terms . 5
5 Constraints to tagged binary fingerprint image data blocks . 5
5.1 Overview . 5
5.2 Use of the ISO/IEC 39794-1 application profile for eMRTDs . 6
5.3 Use of fallback values even if there is no extension . 6
5.4 Top-level type definition . 6
5.5 Version block . 6
5.6 Representation blocks . 6
5.7 Finger position code . 6
5.8 Impression code . 7
5.9 Image data format code . 7
5.10 Image data . 8
5.11 Optional capture date/time block. 8
5.12 Optional capture device block . 8
5.13 Optional quality blocks . 8
5.14 Optional spatial sampling rate block . 9
5.14.1 General . 9
5.14.2 Samples per unit . 9
5.14.3 Unit dimension code . 9
5.15 Optional flag whether the position code has been determined by the capture system . 9
5.16 Optional original rotation . 9
5.17 Optional flag whether the image has been rotated to vertical . 9
5.18 Optional flag whether the image has been lossily compressed . 9
5.19 Optional segmentation blocks . 9
5.20 Optional annotation blocks . 9
5.21 Optional PAD data block . 10
5.22 Optional comment blocks . 10
5.23 Vendor specific data blocks . 10
Annex A (normative) ASN.1 module for fingerprint image data in eMRTDs . 11
Annex B (informative) Structure of data group 3 . 15
Annex C (informative) Encoding examples . 18
Bibliography . 25
European foreword
This document (FprCEN/TS 18214:2025) has been prepared by Technical Committee CEN/TC 224
“Personal identification and related personal devices with secure elements, systems, operations and
privacy in a multi sectorial environment”, the secretariat of which is held by AFNOR.
This document is currently submitted to the Vote on TS.
Introduction
To meet newly emerging requirements and to avoid compatibility issues in future, ISO/IEC JTC 1/SC 37
developed the ISO/IEC 39794 series of standards defining extensible biometric data interchange formats
capable of including possible extensions in a structured manner. The eighth edition of ICAO Doc 9303
“Machine readable travel documents” (MRTDs) moves from using the first edition of the ISO/IEC 19794
series for encoding biometric reference data to using the ISO/IEC 39794 series for this purpose. To
support the transition to the extensible biometric data interchange format, ISO/IEC JTC 1/SC 17
developed an ICAO TR “ISO/IEC 39794-5 application profile for eMRTDs” [1] specifying how to use
ISO/IEC 39794-5 [2] for the mandatory face image data stored in electronic MRTDs (eMRTDs).
According to ICAO Doc 9303, storage of fingerprint and iris image data in eMRTDs is optional. In
electronic identity documents issued by several countries, however, fingerprint image data are
mandatory in addition to face image data [3] [4]. Therefore, this document specifies how to use
ISO/IEC 39794-4 for fingerprint image data stored in eMRTDs. This document follows the same approach
as the ICAO TR “ISO/IEC 39794-5 application profile for eMRTDs” by restricting optional elements and
permitted values. The encoding specified in this document takes precedence over the encoding examples
in ISO/IEC TR 49794:2022 [5].
1 Scope
The eighth edition of ICAO Doc 9303 progresses from using the first edition of the ISO/IEC 19794 series
for encoding biometric reference data in electronic machine-readable travel documents to using the
ISO/IEC 39794 series for this purpose. This document specifies how to use ISO/IEC 39794-4 for
fingerprint image data stored in electronic machine-readable travel documents.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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 39794-1, Information technology — Extensible biometric data interchange formats — Part 1:
Framework
ISO/IEC 39794-4:2019, Information technology — Extensible biometric data interchange formats —
Part 4: Finger image data
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO/IEC 39794-1 and
ISO/IEC 39794-4 apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at https://www.electropedia.org/
4 Symbols and abbreviated terms
For the purposes of this document, the following symbols and abbreviations apply:
ASN.1 Abstract Syntax Notation One
BCD binary-coded decimal
BDB biometric data block
eMRTD electronic MRTD
LDS logical data structure
MRTD machine-readable travel document
PAD presentation attack detection
5 Constraints to tagged binary fingerprint image data blocks
5.1 Overview
The ISO/IEC 39794 series uses extensible ASN.1 modules to specify biometric data blocks (BDBs). The
BDBs are encoded using the tagged binary encoding scheme, which results from application of the ASN.1
Distinguished Encoding Rules (DER) to the ASN.1 module.
As impacted by ISO/IEC 39794-4:2019/Amd.1:2023
The fingerprint image data block in eMRTDs shall follow ISO/IEC 39794-4 except for the changes that are
detailed in this clause and integrated into Annex A. Only restrictions of optional elements and of possible
values are permitted modifications. Every BDB that conforms to this application profile also conforms to
ISO/IEC 39794-4, but not every BDB that conforms to ISO/IEC 39794-4 conforms to this application
profile. Limiting the number of options can facilitate interoperability.
Annex A contains the modified ASN.1 module based on the ASN.1 module from
ISO/IEC 39794-4:2019/Amd.1:2023 (available at https://standards.iso.org/iso-iec/39794/-4/ed-
1/en/amd/1). Future extensions will be done as described in ISO/IEC 39794-1.
In eMRTDs, the finger image data block is part of data group 3 (DG3), which is specified in ICAO Doc 9303
Part 10 [6]. Annex B summarizes the structure of DG3 for convenience.
Annex C shows the encoding of fingerprint image data block examples and of full DG3 examples.
5.2 Use of the ISO/IEC 39794-1 application profile for eMRTDs
ISO/IEC 39794-1 contains an ASN.1 module that specifies common data types to be imported into the
ASN.1 modules in the other parts of the ISO/IEC 39794 series. The ICAO TR “ISO/IEC 39794-5 application
profile for eMRTDs” [1] removed some options from the ASN.1 module defined in ISO/IEC 39794-1. The
ASN.1 module in Annex A imports from the same ISO/IEC 39794-1 application profile (available at
https://github.com/ICAO-TRIP-ISO-WG3/39794-5-AP) that the ISO/IEC 39794-5 application profile for
face image data in eMRTDs imports from.
5.3 Use of fallback values even if there is no extension
According to ISO/IEC 39794-1, for extensible enumerated types with a fallback value, decoders can use a
fallback value defined in the original type. In that way, if an unknown value is received, the decoder can
revert to the fallback value. Like the ICAO TR “ISO/IEC 39794-5 application profile for eMRTDs” [1], this
document restricts the structure of extensible enumerated types with fallback value by always requiring
a fallback value, even if there is no extension.
5.4 Top-level type definition
No constraints.
5.5 Version block
The value of the “generation” element shall be 3.
For fingerprint image data blocks co
...
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