ISO/IEC 29109-5:2012

INTERNATIONAL ISO/IEC
STANDARD 29109-5
Second edition
2012-05-01


Information technology — Conformance
testing methodology for biometric data
interchange formats defined in
ISO/IEC 19794 —
Part 5:
Face image data
Technologies de l'information — Méthodologie d'essai de conformité
pour les formats d'interéchange de données biométriques définis dans
l'ISO/CEI 19794 —
Partie 5: Données d'image de la face




Reference number
ISO/IEC 29109-5:2012(E)
©
ISO/IEC 2012

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ISO/IEC 29109-5:2012(E)

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©  ISO/IEC 2012
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ISO/IEC 29109-5:2012(E)
Contents Page
Foreword . iv
Introduction . v
1 Scope . 1
2 Conformance . 1
3 Normative references . 2
4 Terms and definitions . 2
5 Symbols and abbreviated terms . 2
6 Conformance testing methodology . 2
6.1 Overview . 2
6.2 Table of requirements in the base standard . 2
6.3 ISO/IEC 19794-5:2005 Level 1 and 2 test assertions . 11
Bibliography . 26

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ISO/IEC 29109-5:2012(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.
ISO/IEC 29109-5 was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology,
Subcommittee SC 37, Biometrics.
This second edition cancels and replaces the first edition (ISO/IEC 29109-5:2011), which has been technically
revised.
ISO/IEC 29109 consists of the following parts, under the general title Information technology — Conformance
testing methodology for biometric data interchange formats defined in ISO/IEC 19794:
 Part 1: Generalized conformance testing methodology
 Part 2: Finger minutiae data
 Part 4: Finger image data
 Part 5: Face image data
 Part 6: Iris image data
 Part 7: Signature/sign time series data
 Part 8: Finger pattern skeletal data
 Part 9: Vascular image data
 Part 10: Hand geometry silhouette data

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ISO/IEC 29109-5:2012(E)
Introduction
ISO/IEC 19794-5:2005 specifies a data record interchange format for storing, recording, and transmitting one
or more face images within a Common Biometric Exchange Formats Framework (CBEFF) data structure.
Each image is accompanied by subject-specific and image-specific metadata contained in a header record.
This part of ISO/IEC 29109 establishes tests for checking the correctness of the binary record.
The objective of ISO/IEC 19794-5:2005 cannot be completely achieved until biometric products can be tested
to determine whether they conform to those specifications. Conforming implementations are a necessary
prerequisite for achieving interoperability among implementations; therefore there is a need for a standardized
conformance testing methodology, test assertions, and test procedures as applicable to specific modalities
addressed by each part of ISO/IEC 19794. The test assertions will cover as much as practical of the
ISO/IEC 19794 requirements (covering the most critical features), so that the conformity results produced by
the test suites will reflect the real degree of conformity of the implementations to ISO/IEC 19794 data
interchange format records. This is the motivation for the development of this conformance testing
methodology.
This part of ISO/IEC 29109 supports those applications that require use of face image data according to
ISO/IEC 19794-5:2005. It defines a testing methodology to assure conformance of a vendor’s application or
service to the base ISO/IEC 19794-5:2005 specification. Thus, this part of ISO/IEC 29109 is intended to:
 establish elements of the conformance testing methodology framework that are specific to the face
image-based data record requirements of ISO/IEC 19794-5:2005 conformance testing;
 define requirements and guidelines for specifying conformance test suites and related test methods for
measuring conformity of products and services to the face image-based data record requirements of
ISO/IEC 19794-5:2005; and
 define test procedures to be followed before, during, and after conformance testing.
This part of ISO/IEC 29109 is applicable to the development and use of conformity test method specifications,
conformity test suites for ISO/IEC 19794-5:2005 records, and conformance testing programs for
ISO/IEC 19794-5:2005 conformant products. It is intended primarily for use by testing organizations, but may
be applied by developers and users of test method specifications and test method implementations.

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INTERNATIONAL STANDARD ISO/IEC 29109-5:2012(E)

Information technology — Conformance testing methodology
for biometric data interchange formats defined in
ISO/IEC 19794 —
Part 5:
Face image data
1 Scope
This part of ISO/IEC 29109 specifies elements of conformance testing methodology, test assertions, and test
procedures as applicable to two-dimensional face images defined in the ISO/IEC 19794-5:2005 biometric data
interchange format standard for face image data.
This part of ISO/IEC 29109 establishes
・ test assertions of the structure of the face image data format as specified in ISO/IEC 19794-5:2005 (Type
A Level 1 as defined in ISO/IEC 29109-1:2009),
 test assertions of internal consistency by checking the types of values that may be contained within each
field (Type A Level 2 as defined in ISO/IEC 29109-1:2007),
 tests of semantic assertions (Type A Level 3 as defined in ISO/IEC 29109-1:2009).
This part of ISO/IEC 29109 does not establish
 tests of conformance of 3D face records defined in ISO/IEC 19794-5:2005/Amd.2:2009,
 tests of conformance of CBEFF structures required by ISO/IEC 19794-5:2005,
 tests of consistency with the input biometric data record (Level 3),
 tests of conformance of the image data to the quality-related specifications of ISO/IEC 19794-5:2005,
 tests of conformance of the image data blocks to the respective JPEG or JPEG 2000 standards,
 tests of other characteristics of biometric products or other types of testing of biometric products
(e.g. acceptance, performance, robustness, security).
2 Conformance
Biometric data interchange format conformance tests conform to this part of ISO/IEC 29109 if they satisfy all
of the normative requirements related to Clause 6. Specifically, they shall use the test methodology specified
in Clauses 6, 7 and 8 of ISO/IEC 29109-1, and all Level 1 and Level 2 tests shall use the assertions defined in
Table 2 of Clause 6 of this part of ISO/IEC 29109.
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ISO/IEC 29109-5:2012(E)
Implementations of ISO/IEC 19794-5:2005 tested according to the methodology specified shall be able to
claim conformance only to those biometric data record requirements specified in ISO/IEC 19794-5:2005 that
are tested by the test methods established by this methodology.
Implementations of ISO/IEC 19794-5:2005 do not necessarily need to conform to all possible aspects of
ISO/IEC 19794-5:2005, but only to those ISO/IEC 19794-5:2005 requirements that are claimed to be
supported by the implementation in an Implementation Conformance Statement, filled out in accordance with
Clause 8 of ISO/IEC 29109-1 and Table 1 of Clause 6 in this part of ISO/IEC 29109.
3 Normative references
The following referenced documents are indispensable for the application 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 19794-5:2005, Information technology — Biometric data interchange formats — Part 5: Face image
data
ISO/IEC 29109-1:2009, Information technology — Conformance testing methodology for biometric data
interchange formats defined in ISO/IEC 19794 — Part 1: Generalized conformance testing methodology
4 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO/IEC 29109-1 apply.
5 Symbols and abbreviated terms
For the purposes of this document, the symbols and abbreviated terms given in ISO/IEC 29109-1 apply.
6 Conformance testing methodology
6.1 Overview
The testing methodology specified in Clauses 6, 7 and 8 of ISO/IEC 29109-1 shall apply. The content of the
tables below is based on the conformance testing methodology outlined in ISO/IEC 29109-1 and shall only be
used in the context of that testing methodology.
6.2 Table of requirements in the base standard
The normative requirements of ISO/IEC 19794-5:2005 are listed in Table 1. The supplier of the IUT can
explain which optional components of the standard are supported and the testing laboratory can note the
results of the test.
Under subformat applicability the columns labelled B, F and T indicate the Basic, Full Frontal and Token
Frontal image types.
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ISO/IEC 29109-5:2012(E)
Table 1 — Requirements of the Base Standard (ISO/IEC 19794-5:2005)
Requi- Ref. in Requirement Summary Level Status Subformat IUT Supported Test
rement Base Applicability Support Range Result
ID Std
B F T

R-1 5.2.1 Within the record format and all well-defined data blocks therein, 1 M Y Y Y
all multi-byte quantities are [implied shall] stored in Big-Endian
format. That is, the more significant bytes of any multi-byte
quantity are stored at lower addresses in memory than less
significant bytes. For example, the value 1025 (2 to the 10th
power plus one) would be stored as first byte= 00000100 and
second byte=00000001.

R-2 5.2.2 Numeric Values 3C O-3 Y Y Y
All numeric values are fixed-length unsigned integer quantities,
unless otherwise specified.
R-3 5.4.1 Format Identifier 1 M Y Y Y
The (4 byte) Format Identifier shall consist of three ASCII
characters “FAC” followed by a zero byte as a NULL string
terminator to identify the record format as the face record format.

R-4 5.4.2 Version Number 1 M Y Y Y
The (4 byte) Version Number block shall consist of three ASCII
numerals followed by a zero byte as a NULL string terminator.
The first and second character will represent the major version
number and the third character will represent the minor revision
number.
The version number of this specification shall be 0x30313000;
“010” – Version 1 revision 0.
32
R-5 Table 2 57 ≤ Length of Record ≤ 2 - 1 1 M Y Y Y
R-6 5.4.3 Length of Record 2 M Y Y Y
The (4 byte) Record Length Block shall be the combined length in
bytes for the record. This is the entire length of the record
including the Facial Record Header and Facial Record Data.
R-7 Table 2 1 ≤ Number of Facial Images ≤ 65 535 1 M Y Y Y

R-8 5.4.4 Number of Facial Images 2 M Y Y Y
The (2 byte) Number of Facial Images block shall be the number
of facial images included in the record.
R-9 5.5 The Facial Information block 2 M-2 Y Y Y
The (20 byte) Facial Information block is intended to describe
discrete properties of the individual discernable from the image,
one is included for each facial image included in the record. The
structure of this block is shown in [ISO/IEC 19794-5:2005] Figure
2.
Zero or more Facial Feature blocks, one Image Information block,
and one Image Data block follow this block.

R-10 5.5.1 Facial Record Data Length 2 M Y Y Y
The (4 byte) Facial Record Data Length field denotes the sum of
the lengths of the Facial Information block, the Feature Point
block(s), the Image Information block, and the Image Data block.
The minimum value of the Facial Record Data Length is 32 bytes
plus the size of the Image Data block (in bytes).
R-11 5.5.2 Number of Feature Points 2 M Y Y Y
The (2 byte) Number of Feature Points block shall be the number
of Feature Point blocks that follow the Facial Information block.
The Feature Point block is defined in [ISO/IEC 19794-5:2005]
Clause 5.6.

R-12 5.5.3 Gender 1 M Y Y Y
The (1 byte) Gender block shall be specified in accordance with
[ISO/IEC 19794-5:2005] Table 3.

R-13 5.5.4 Eye Colour 1 M Y Y Y
The (1 byte) Eye Colour field shall represent the colour of irises of
the eyes according to [ISO/IEC 19794-5:2005] Table 4. If the eyes
are different colours, then right eye colour is to be encoded.

R-14 5.5.5 Hair Colour 1 M Y Y Y
The (1 byte) Hair Colour field shall represent the colour of the hair
according to the [ISO/IEC 19794-5:2005] Table 5.
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ISO/IEC 29109-5:2012(E)
Requi- Ref. in Requirement Summary Level Status Subformat IUT Supported Test
rement Base Applicability Support Range Result
ID Std
B F T
R-15 5.5.6 Property Mask 2 M Y Y Y
The (3 byte) Property Mask is a bit mask of 3 bytes and each bit of
the mask position listed in [ISO/IEC 19794-5:2005] Table 6 shall
be set to 1 if the corresponding property is present, and set to 0 if
absent. The mask position starts from 0 at the lowest bit. The
lowest bit set to 0 shall indicate that properties are not specified
(and all bits shall be zero); the lowest bit set to 1 shall indicate that
all listed properties have been considered and that a zero value of
any property bit indicates an absence of that property.
Note that a Blink flag set to “1” will indicate non-compliance with
the Frontal, Full Frontal, and Token image types.

R-16 5.5.7 Expression 1 M Y Y Y
The (2 byte) Expression field shall represent the expression of the
face according to [ISO/IEC 19794-5:2005] Table 7.
R-17 5.5.8 Pose Angle 3C O-1 Y Y Y
The (3 multi byte) Pose Angle field (B , B , B ) shall represent the
Y P R
estimate or measure pose of the subject in the image. Each byte
in the field respectively represents pose angles of yaw, pitch and
roll in that order. The pose angle is given by Tait-Bryan angles.
• Yaw angle: Rotation about the vertical (y) axis.
• Pitch angle: Rotation about the horizontal side-to-side (x)
horizontal axis.
• Roll angle: Rotation about the horizontal back to front (z) axis.
The angles are defined relative to the frontal view of the subject,
which has angles (0,0,0) as shown in [ISO/IEC 19794-5:2005]
Figure 4. The examples are shown in [ISO/IEC 19794-5:2005]
Figure 5.
As order of the successive rotation around the different axes does
matter, the encoded rotation angle shall correspond to an order of
execution starting from the frontal view. This order shall be given
by Roll (about the front axis), then Pitch (about the horizontal axis)
and finally Yaw (about the vertical axis). The (first executed) Roll
transformation will therefore always be in the image (x,y) plane.
From the point of view of executing a transformation from the
observed view to a frontal view, the transformation order will
therefore be Yaw, Pitch, and then Roll. Note however that the
encoded angle is from the frontal view to the observed view.
R-18 5.5.8.1 Pose Angle – Yaw 1 M Y Y Y
The yaw angle Y is the rotation in degrees about the y-axis
(vertical axis) shown in [ISO/IEC 19794-5:2005] Figure 4. Frontal
faces have a yaw angle of 0 degrees. Positive angles represent
faces looking to their left (a counter-clockwise rotation around the
y-axis).
The encoding B of the yaw angle Y shall be in degrees as a byte
Y
(1 byte) with values from –180 to 180.
If 180 ≥ Y ≥ 0 and Y is even, then B = Y/2+1
Y
If 180 ≥ Y > 0 and Y is odd, then B = (Y+1)/2
Y
If -180 ≤ Y < 0 and Y is even, then B = 181+Y/2.
Y
If -180 ≤ Y < 0 and Y is odd, then By = 181+(Y-1)/2
The maximum value of B is 180. If the yaw angle is not specified,
Y
the value of B shall be 0.
Y

R-19 5.5.8.2 Pose Angle – Pitch 1 M Y Y Y
The pitch angle is the rotation in degrees about the x-axis
(horizontal axis) shown in [ISO/IEC 19794-5:2005] Figure 4.
Frontal faces have a pitch angle of 0 degrees. Positive angles
represent faces looking down (a counterclockwise rotation around
the x-axis).
The encoding B of the yaw angle P shall be in degrees as a byte
P
(1 byte) with values from –180 to 180.
If 180 ≥ P ≥ 0 and P is even, then B = P/2+1
P
If 180 ≥ P > 0 and P is odd, then B = (P+1)/2
P
If -180 ≤ P < 0 and P is even, then B = 181+P/2.
P
If -180 ≤ P < 0 and P is odd, then B = 181+(P-1)/2
P
The maximum value of B is 180. If the pitch angle is not specified,
P
the value of B shall be 0.
P
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ISO/IEC 29109-5:2012(E)
Requi- Ref. in Requirement Summary Level Status Subformat IUT Supported Test
rement Base Applicability Support Range Result
ID Std
B F T
R-20 5.5.8.3 Pose Angle – Roll 1 M Y Y Y
The roll angle is the rotation in degrees about the z-axis (the
horizontal axis from front to back) shown in [ISO/IEC 19794-
5:2005] Figure 4. Frontal faces have a roll angle of 0 degrees.
Positive angles represent faces tilted toward their right shoulder
(counter-clockwise rotation around the z-axis).
The encoding B of the yaw angle R shall be in degrees as a byte
R
(1 byte) with values from –180 to 180.
If 180 ≥ R ≥ 0 and R is even, then B = R/2+1
R
If 180 ≥ R > 0 and R is odd, then B = (R+1)/2
R
If -180 ≤ R < 0 and R is even, then B = 181+R/2.
R
If -180 ≤ R < 0 and R is odd, then B = 181+(R-1)/2
R
The maximum value of B is 180. If the roll angle is not specified,
R
the value of B shall be 0.
R

R-21 5.5.9 Pose Angle Uncertainty 1 M Y Y Y
The (3 multi-byte) Pose Angle Uncertainty (U , U , U ) represents
Y P R
the expected degree of accuracy of the pose angle yaw, pitch, and
roll. Each byte in the field respectively represents the uncertainty
of yaw, pitch and roll in that order. The uncertainty is allowed to
represent experimental uncertainty specified by each vendor.
The encoding of Pose Angle Uncertainty is given by bytes (U , U ,
Y P
U ) where each byte U in the field (k=Y,P,R) represents 1 degree
R K
of uncertainty with minimum and maximum values of 1 and 181
where U =(uncertainty+1). The more uncertain, the value of the
K
uncertainty U shall become larger. If the uncertainty is not
K
specified, then the values of U , U and U shall be set to zero (0).
Y P R

R-22 5.6 The Feature Point Block 1 M Y Y Y
The optional (8 byte) Feature Point block specifies the type, code
and position of a Feature Point in the facial image. The number of
Feature Point blocks shall be specified in the Number of Feature
Points field of the Facial Information Block. The structure of this
block is shown in [ISO/IEC 19794-5:2005] Table 8.
R-23 5.6.1 Feature Point Type 1 M Y Y Y
The (1 byte) Feature Point Type field represents the type of the
Feature Point stored in the Feature Point block. This field shall be
set to 0x01 to denote that the position of the Feature Point is
represented by the coordinate of the image. All other field values
are reserved for future definition of Feature Point types.

R-24 5.6.2 Feature Point Code 1 M Y Y Y
The (1 byte) Feature Point Code field shall specify the Feature
Point that is stored in the Feature Point block. The codes of the
Feature Points in [ISO/IEC 19794-5:2005] clause 5.6.3, taken from
the MPEG4 standard and defined as MPEG4 Feature Points, or
the additional eye and nostril Feature Points in [ISO/IEC 19794-
5:2005] clause 5.6.4 shall be stored in this block.
Each Feature Point code is represented by a notation A.B using a
major (A) and a minor (B) value. The encoding of the Feature
Point code is given by the (1 byte) value of A*16 + B.

R-25 5.6.3 MPEG4 Feature Points 3C O-1 Y Y Y
[ISO/IEC 19794-5:2005] Figure 6 denotes the Feature Point codes
associated with Feature Points as given by Annex C of
ISO/IEC 14496-2

R-26 5.6.4 Eye and nostril centre Feature Points 3C O-1 Y Y Y
The eye centre Feature Points 12.1 (left) and 12.2 (right) are
defined to be the horizontal and vertical midpoints of the eye
corners (3.7, 3.11) and (3.8, 3.12) respectively. The left nostril
centre Feature Point 12.3 is defined to be the midpoint of the nose
Feature Points (9.1, 9.15) in the horizontal direction and (9.3,9.15)
in the vertical direction. Similarly, the right nostril centre Feature
Point 12.4 is defined to be the midpoint of the nose Feature Points
(9.2, 9.15) in the horizontal direction and (9.3,9.15) in the vertical
direction. Both the eye centre and nostril centre Feature Points are
shown in [ISO/IEC 19794-5:2005] Figure 7 and values given in
[ISO/IEC 19794-5:2005] Table 9.
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ISO/IEC 29109-5:2012(E)
Requi- Ref. in Requirement Summary Level Status Subformat IUT Supported Test
rement Base Applicability Support Range Result
ID Std
B F T
R-27 5.7 The Image Information Block 2 M-2 Y Y Y
The (16 byte) Image Information block is intended to describe
digital properties of the facial image, one is included for each
facial image included in the record. The structure of this block is
shown in [ISO/IEC 19794-5:2005] Figure 2. One Image Data block
shall follow this block.

R-28 5.7.1 Face Image Type 1 M Y Y Y
The Face Image Type field shall represent the type of the facial
image stored in the Image Data Block according to
[ISO/IEC 19794-5:2005] Table 10. Note that all Frontal Image
Types are either Full Frontal or Token Frontal. Therefore a
separate Frontal Value is not required.
The Basic Face Image Type is defined in [ISO/IEC 19794-5:2005]
clause 6. The Frontal, Frontal/Full and Frontal/Token Face Image
Types are defined in [ISO/IEC 19794-5:2005] clauses 7, 8, and 9
respectively. Face Image Types use the notion of inheritance. For
example, the Frontal Face Image Type inherits all of the
requirements of the Basic Face Image Type - the Frontal Face
Image type obeys all normative requirements of the Basic Face
Image Type. The inheritance structure of currently defined image
types is shown in [ISO/IEC 19794-5:2005] Figure 8.

R-29 5.7.2 Image Data Type 2 M Y Y Y
The (1 byte) Image Data Type field denotes the encoding type of
the Image Data block. Either JPEG (ISO/IEC 10918-1 and ITU-T
Rec. T.81) or JPEG2000 (ISO/IEC 15444-1) shall be specified.
Note that a “Unspecified” Value cannot be encoded.

R-30 5.7.3 Width 2 M Y Y Y
The (2 byte) Width field shall specify the number of pixels in the
horizontal direction.
R-31 5.7.4 Height 2 M Y Y Y
The (2 byte) Height field shall specify the number of pixels in the
vertical direction.

R-32 5.7.5 Image Colour Space 2 M Y Y Y
The (1 byte) Image Colour Space field indicates the colour space
used in the encoded Image Data block according to the values in
[ISO/IEC 19794-5:2005] Table 12. The values of 128-255 are
vendor specific. Application developers may obtain the values for
these codes from the vendor.

R-33 5.7.6 Source Type 1 M Y Y Y
The (1 byte) Source Type field denotes the classification of the
source of the captured image and is given in [ISO/IEC 19794-
5:2005] Table 13.
R-34 5.7.7 Device Type 1 M Y Y Y
The (2 byte) Device Type field denotes the vendor specific capture
device type ID. A value of all zeros will be acceptable and will
indicate that the capture device type ID is unspecified. Application
developers may obtain the values for these codes from the
vendor.

R-35 5.7.8 Quality 1 M Y Y Y
The (2 byte) Quality field shall be reserved for future definition to
represent a quality of the facial image. This field shall be set to the
value 0 indicating “unspecified”.

R-36 5.8.1 Data structure 2 M Y Y Y
The (variable byte) Image Data block shall be the image data
encoded by either the JPEG or JPEG2000 standards.
Basic Face Image Type
R-37 6.2 Image data encoding requirements for the Basic Face Image Type2 M Y Y Y
One of two possible encodings is to be used for all image types
(Basic)
1) The JPEG Sequential baseline (ISO/IEC 10918-1) mode of
operation and encoded in the JFIF file format (the JPEG file
format)
2) The JPEG-2000 Part-1 Code Stream Format (ISO/IEC 15444-
1) and encoded in the JP2 file format (the JPEG2000 file format).
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ISO/IEC 29109-5:2012(E)
Requi- Ref. in Requirement Summary Level Status Subformat IUT Supported Test
rement Base Applicability Support Range Result
ID Std
B F T
R-38 6.4.1 Facial Header [for the Basic Face Image Type] 1 M Y Y Y
The Format Identifier, Version Number, Length of Record, and
Number of Faces fields shall be specified.

R-39 6.4.2 Facial Information [for the Basic Face Image Type] 1 M Y Y Y
The Block Length and Number of Feature Points fields shall be
specified.
R-40 6.4.3 Image Information [for the Basic Face Image Type] 1 M Y Y Y
The Face Image Type field shall be specified with value 0x00.
R-41 6.4.3 The Image Data Type, Width, and Height fields shall be specified. 1 M Y Y Y
The Frontal Face Image Type

R-42 7.2.2 Pose 3C O-1 N Y Y
Thus, the full-face frontal pose shall be used. Rotation of the head
shall be less than ±5° from frontal in pitch and yaw (see 5.5.8).
Pose variations that lead to an in-plane rotation of the head can be
more easily compensated by automated face recognition systems.
Therefore, the rotation of the head shall be less than ±8° from
frontal in roll (see 5.5.8). [ISO/IEC 19794-5:2005] Figure Cor.1.1
shows an example of ±8° rotation in roll.
The best practice recommendation as outlined in A.2.2 is that the
rotation of the head should be less than ±5° from frontal in roll.
This constraint refers to the pose of the subject associated with
the face image format data for all applications that call for this
format to be used.
[NOTE: This text is from ISO/IEC 19794-5:2005/Cor.2 Published
2008-07-01]

R-43 7.2.4 Assistance in positioning the face 3C O-1 N Y Y
In no cases will any other face be captured in the Frontal image.
See informative annex A.2 for best practices on this topic.
R-44 7.2.5 Shoulders 3C O-1 N Y Y
Shoulders shall be “square on” to the camera. “Portrait style”
photographs where the subject is looking over one shoulder are
not acceptable.
R-45 7.2.7 Subject and scene lighting 3C O-1 N Y Y
Lighting shall be equally distributed on the face.
...