ISO/IEC 19794-4:2011/Amd 1:2013

INTERNATIONAL ISO/IEC
STANDARD 19794-4
Second edition
2011-12-15
AMENDMENT 1
2013-06-15
Information technology — Biometric data
interchange formats —
Part 4:
Finger image data
AMENDMENT 1: Conformance testing
methodology and clarification of defects
Technologies de l'information — Formats d'échange de données
biométriques —
Partie 4: Données d'image du doigt
AMENDEMENT 1: Méthodologie d'essai de conformité et précisions
concernant les défauts
Reference number
ISO/IEC 19794-4:2011/Amd.1:2013(E)
©
ISO/IEC 2013
ISO/IEC 19794-4:2011/Amd.1:2013(E)

©  ISO/IEC 2013
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ii © ISO/IEC 2013 – All rights reserved

ISO/IEC 19794-4:2011/Amd.1:2013(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. 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 Standards. 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.
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.
Amendment 1 to ISO/IEC 19794-4:2011 was prepared by Joint Technical Committee ISO/IEC JTC 1,
Information technology, Subcommittee SC 37, Biometrics.

© ISO/IEC 2013 – All rights reserved iii

ISO/IEC 19794-4:2011/Amd.1:2013(E)

Information technology — Biometric data interchange
formats —
Part 4:
Finger image data
AMENDMENT 1: Conformance testing methodology and clarification
of defects
1. The following text is to be added to the "Introduction" clause of ISO/IEC 19794-4:
Annex A addresses conformance testing to this part of ISO/IEC 19794. Annex A is distinct from
ISO/IEC 29109-4, which addresses conformance testing to ISO/IEC 19794-4:2005.
2. The following text is to be added to the "Scope" clause of ISO/IEC 19794-4:
This part of ISO/IEC 19794 also specifies elements of conformance testing methodology, test assertions,
and test procedures as applicable to this part of ISO/IEC 19794. It establishes test assertions pertaining to
the structure of the finger image data format (Type A Level 1 as defined in ISO/IEC 19794-1:2011 AMD
1), test assertions pertaining to internal consistency of the types of values that may be contained within
each field (Type A Level 2 as defined in ISO/IEC 19794-1:2011 AMD 1), and semantic test assertions
(Type A Level 3 as defined in ISO/IEC 19794-1:2011 AMD 1).
The conformance testing methodology specified in this part of ISO/IEC 19794 does not establish:
 tests of other characteristics of biometric products or other types of testing of biometric products
(e.g. acceptance, performance, robustness, security),
 tests of conformance of systems that do not produce data records conforming to the
requirements of this part of ISO/IEC 19794.
3. The following text is to be added to the "Conformance" clause of ISO/IEC 19794-4:
Biometric data interchange format conformance tests conform to this part of ISO/IEC 19794 if they satisfy
all of the normative requirements set forth in clause 8. Specifically, they shall use the test methodology
specified in Clauses A.1, A.2 and A.3 of ISO/IEC 19794-1:2011 AMD 1, and all Level 1, Level 2 and Level
3 tests shall use the assertions defined in Table A.2 of Clause A.3 of this part of ISO/IEC 19794 in
conformity with the concept and rules set in 19794-1 Annex A .
Implementations of this part of ISO/IEC 19794 tested according to the specified methodology shall be able
to claim conformance only to those biometric data record (BDB) requirements specified in this part of
ISO/IEC 19794 that are tested by the test methods established by this methodology.
Implementations of this part of ISO/IEC 19794 do not necessarily need to conform to all possible aspects
of this part of ISO/IEC 19794, but only to those requirements that are claimed to be supported by the

Annex A is specified in ISO/IEC 19794-1:2011 Amendment 1.
© ISO/IEC 2013 – All rights reserved 1

ISO/IEC 19794-4:2011/Amd.1:2013(E)
implementation in an implementation conformance statement (ICS), filled out in accordance with Clause
A.3 of ISO/IEC 19794-1:2011 AMD 1 and Table A.2 of Clause A.3 of this part of ISO/IEC 19794.
4. In clause 8.3.1 of ISO/IEC 19794-4:2011, Table 2, row “Image compression algorithm”, Replace “0 to 5”
with “0 to 6”.
5. Replace Annex A of ISO/IEC 19794-4:2011 with the following one:
2 © ISO/IEC 2013 – All rights reserved

ISO/IEC 19794-4:2011/Amd.1:2013(E)
Annex A
(normative)
Conformance testing methodology
A.1 Introduction
This normative annex specifies elements of conformance testing methodology, test assertions, and test
procedures as applicable to this part of biometric data interchange format standard. Specifically, it establishes
 test assertions of the structure of the finger image data format as specified in this Part of ISO/IEC 19794
(Type A Level 1 as defined in ISO/IEC 19794-1:2011 AMD 1),
 test asssertions of internal consistency by checking the types of values that maybe contained within each
field (Type A Level 2 as defined in ISO/IEC 19794-1:2011 AMD 1),
 tests of semantic assertions (Type A Level 3 as defined in ISO/IEC 19794-1:2011 AMD 1).
This normative annex does not establish
 test assertions on other characteristics of biometric products (e.g. acceptance, performance, robustness,
security),
 conformance test assertions on systems that do not produce finger image record as specified in this part
of ISO/IEC 19794.
The conformance testing methodology specified in ISO/IEC 19794-1: 2011 AMD 1 shall apply. The content of
the tables below is based on ISO/IEC 19794-1:2011, AMD 1 and shall only be used in the context of that
conformance testing methodology.
A.2 Table of requirements
The normative requirements specified in this Part of ISO/IEC 19794 are listed in Table A.1. The supplier of the
IUT should explain which optional components of the standard are supported and the testing laboratory shall
note the results of the test.
Table A.1 — Data format requirements specified in this Part of ISO/IEC 19794
Requirement Governing Requirement Summary Level Status IUT Supported Test
Identifier section Support Range Result
Finger image general header
8.1 Each record shall pertain to a single subject. 3C O-1 N/A N/A
R-1.
8.1 Each record shall contain at least one 3C O-1 N/A N/A
R-2.
representation for each of one or more fingers,
multiple fingers (single image records), or palms.
8.2.1 Information shall be included for each field within 1 M
R-3.
the header.
The format identifier shall be recorded in four
8.2.2 1 M
R-4.
bytes.
Table 1
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ISO/IEC 19794-4:2011/Amd.1:2013(E)
Requirement Governing Requirement Summary Level Status IUT Supported Test
Identifier section Support Range Result
8.2.2 The format identifier shall consist of three 1 M N/A
R-5.
characters "FIR" (0x464952) followed by a zero
Table 1
byte as a NULL string terminator. Therefore, the
format identifier shall be 0x46495200.
8.2.3 The Version Number shall be recorded in four 1 M N/A
R-6.
bytes.
Table 1
8.2.3 This version number shall consist of three ASCII 1 M N/A
R-7.
numerals “020” (0x30323000) followed by zero
Table 1
byte as a NULL string terminator.
8.2.4 The length (in bytes) of the entire image data 2 M
R-8.
record shall be recorded in four bytes. Valid values
Table 1
are 57 to (2 -1 )
8.2.4 This length of entire record shall be total length of 2 M
R-9.
the general record header and one or more
representation records.
8.2.5 The total number of finger image representations 1,2 M
R-10.
contained in the finger image data record shall be
Table 1
recorded in two bytes. Valid values are 1 to 672.
8.2.5 A minimum of one representation is required. 1 M
R-11.
8.2.6 The one-byte certification flag shall indicate 1 M
R-12.
whether each representation header includes a
Table 1
certification record. Valid values are 00 and
Hex
01 .
Hex
8.2.6 A value of 00 shall indicate that none of the 2 M
Hex
R-13.
representations contains a certification record.
8.2.6 A value of 01 shall indicate that all 2 M
Hex
R-14.
representations contain a certification record.
8.2.7 The number of finger or palm images included in 1 M
R-15.
the record shall be recorded in one byte. Valid
Table 1
values are 1 to FF .
HEX
Finger image representation header
8.3.1 A finger or palm representation header shall start 3C O-1 N/A N/A
R-16.
each section of finger data providing information for
that representation of a single finger image, multi-
finger image or palm image.
8.3.1 For each such image there shall be one finger 2 M N/A
R-17.
header record accompanying the representation of
the image data.
8.3.1 The representaion header shall occupy a minimum 2 M
R-18.
of 41 bytes (assuming no certification blocks and
no quality blocks are present).
Otherwise, it shall be
42+ 5*num_quality_block+
3*num_certification_block
8.3.1 The compressed or uncompressed image data for 3C O-1 N/A N/A
R-19.
that image representation shall immediately follow
the image representation header.
8.3.1 Subsequent image representations (including the 3C O-1 N/A N/A
R-20.
image representation header) will be concatenated
to the end of the previous image representation.
4 © ISO/IEC 2013 – All rights reserved

ISO/IEC 19794-4:2011/Amd.1:2013(E)
Requirement Governing Requirement Summary Level Status IUT Supported Test
Identifier section Support Range Result
8.3.2 The four-byte representation length field shall 2 M
R-21.
contain the length in bytes of the finger
Table 2
representation including the representation header
fields. The minimum length is 41.
8.3.3 Capture date-time field shall indicate the date and 3C O-1
R-22.
time the representation was captured. This field is
Table 2
not intended to encode the time the record was
instantiated.
8.3.3 Capture time field shall be encoded in accordance 1 M
R-23.
to the requirements given in Part 1 of this standard.
Table 2
Parts of the capture date and time that are
unknown shall be filled with FF , or FFFF for
Hex Hex
two-byte components and all subsequent
components shall be unknown.
8.3.4 The one-byte capture device technology ID shall 1 M
R-24.
contain the entry chosen from Table 4 to indicate
Table 4
the technology type used by the capture device.
Valid values are 0 to 20.
8.3.5 The capture device vendor ID shall be recorded in 1 M
R-25.
two bytes.
Table 2
8.3.5 The capture device vendor ID shall identify the 3B M
R-26.
biometric organisation that owns the product that
Table 2
created the biometric record (BDIR) and shall be
registered with the IBIA or other approved
registration authority. A value of all zeros shall
indicate that the capture device vendor is
unreported.
8.3.6 This capture device type ID shall be recorded in 1 M
R-27.
two bytes.
Table 2
8.3.6 This capture device type ID shall identify the 3C O-1  N/A
R-28.
product type that created the biometric record and
Table 2
shall be assigned by the registered biometric
record product owner or other approved
registration authority. A value of all zeros shall
indicate that the capture device type is unreported.
8.3.7.1 The quality information of the overall finger image 1 M
R-29.
data shall be recorded in one or more five-byte
blocks.
8.3.7.1 Each of these blocks shall pertain to a specific 2 M
R-30.
quality/vendor/algorithm evaluation.
8.3.7.2 The first byte of the quality record is mandatory 2 M
R-31.
and shall contain the number of subsequent quality
Table 2
blocks. Valid values are 0 to 255.
8.3.7.2 Subsequent 5-byte blocks shall contain the specific 1,3BM
R-32.
quality/vendor/algorithm information for each
Table 2
quality/vendor/algorithm evaluation.
A value of zero (0) means that no attempt was
8.3.7.2 2 M
R-33.
made to assign a quality score. In this case, no
Table 2
Quality Blocks are present.
8.3.7.3 The quality score shall be recorded in the first byte 1 M
R-34.
of each of the five-byte quality blocks. Valid values
Table 2
for quality score are integers between 0 and 100,
and 255.
© ISO/IEC 2013 – All rights reserved 5

ISO/IEC 19794-4:2011/Amd.1:2013(E)
Requirement Governing Requirement Summary Level Status IUT Supported Test
Identifier section Support Range Result
8.3.7.3 The quality score shall be the quantitative 3C O-1  N/A
R-35.
expression of the predicted verification
Table 2
performance of the biometric sample, per ISO/IEC
29794-1. For valid values 0 to 100, higher values
shall indicate better quality.
8.3.7.3 An entry of “255” shall indicate a failed attempt to 3C O-1  N/A
R-36.
calculate a quality score.
Table 2
8.3.7.4 The provider of
...