ISO/IEC 19794-7:2014/Amd 1:2015

Information technology — Biometric data interchange formats — Part 7: Signature/sign time series data — Amendment 1: XML encoding

Technologies de l'information — Formats d'échange de données biométriques — Partie 7: Données de série chronologique de signature/signe — Amendement 1: Codage XML

General Information

• Status: Withdrawn
• Publication Date: 16-Jul-2015
• ICS: 35.040 - Information coding
• ICS: 35.240.15 - Identification cards. Chip cards. Biometrics
• Technical Committee: ISO/IEC JTC 1/SC 37 - Biometrics
• Drafting Committee: ISO/IEC JTC 1/SC 37 - Biometrics
• Current Stage: 9599 - Withdrawal of International Standard
• Completion Date: 29-Oct-2021

Relations

• Revised: ISO/IEC 19794-7:2021 - Information technology — Biometric data interchange formats — Part 7: Signature/sign time series data
• Effective Date: 23-Apr-2020
• Amends: ISO/IEC 19794-7:2014 - Information technology — Biometric data interchange formats — Part 7: Signature/sign time series data
• Effective Date: 25-Dec-2021

Standards Content (Sample)

INTERNATIONAL ISO/IEC
STANDARD 19794-7
Second edition
2014-02-01
AMENDMENT 1
2015-07-15
Corrected version
2015‐12‐01
Information technology — Biometric
data interchange formats —
Part 7:
Signature/sign time series data
AMENDMENT 1: XML encoding
Technologies de l’information — Formats d’échange de données
biométriques —
Partie 7: Données de série chronologique de signature/signe
AMENDEMENT 1: Codage XML
Reference number
ISO/IEC 19794-7:2014/Amd.1:2015(E)
©
ISO/IEC 2015

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ISO/IEC 19794-7:2014/Amd.1:2015(E)

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ii © ISO/IEC 2015 – All rights reserved

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ISO/IEC 19794-7:2014/Amd 1:2015(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.
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).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment,
as well as information about ISO's adherence to the WTO principles in the Technical Barriers to Trade (TBT)
see the following URL: Foreword - Supplementary information
Amendment 1 to ISO/IEC 19794-7:2014 was prepared by Joint Technical Committee ISO/IEC JTC 1,
Information technology, Subcommittee SC 37, Biometrics.
The corrected version of ISO/IEC 19794-7:2014/Amd 1:2015 incorporates the following corrections.
"Table A.2.2" in AMD 1-8 has been corrected to read "Table A.3".
"Table A.2.3" in AMD 1-9 has been corrected to read "Table A.4".
The sentence in AMD1-9 has been replaced with: "Rename clause "A.2.3 Conformance test assertions for
compression format (binary format)" and ”Table A.2.3 – Conformance test assertions for compression format
(binary format)” in “Annex A”.
"Table A.2.4" in AMD 1-10 has been corrected to read "Table A.5".
© ISO/IEC 2015 – All rights reserved iii

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AMENDMENT ISO/IEC 19794-7:2014/Amd 1:2015(E)N/A
Information technology — Biometric data interchange
formats — Part 7: Signature/sign time series data
AMENDMENT 1: XML encoding
AMD1-1: Insert the following text as introduction to AMENDMENT 1: XML encoding
Additionally, this part of the ISO/IEC standard supports both binary and XML encoding, to
support a spectrum of user requirement. With XML, this part will meet the requirements
modern IT architectures. With binary encoding this part will also be able to be used in
bandwidth or storage constrained environments. Annex E specifies the schema that XML
encoded signature/sign time series data record must conform to, and Annex F provides an
example of a valid XML encoded signature/sign time series data record.
AMD1-2: Replace in clause “1 Scope” "three data formats" with "three binary data formats"
Replace in the first listing the second bullet point “three data formats” with “three binary data
formats”.
AMD1-3: Add in clause “1 Scope” in the first listing a fourth bullet point"
Add in clause “1 Scope” as fourth bullet point of the first listing following:
- an XML schema definition
AMD1-4: Insert the following text into clause “2 Conformance” as second paragraph
An XML document conforms to this part of ISO/IEC 19794 if it satisfies the format
requirements with respect to its structure, relations among its fields, and relations between
its fields and the underlying input that are specified within Annex E of this part of ISO/IEC
19794.
AMD1-5: Insert the following text in the appropriate alphabetical order of Clause , Normative
reference:
- http://www.w3.org/XML/Schema
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ISO/IEC 19794-7:2014/Amd 1:2015(E)
AMD1-6: Replace ”Table A.1 – Table of requirements” in “Annex A”
Table A.1– Table of requirements
Re- Refer- Requirement summary Lev Sta- Applicable to format IUT Sup- Test
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pres
sion
R-1 6.1 The coordinate system used to express the 3B M Y Y Y Y N/A
pen position shall be a three-dimensional
Cartesian coordinate system.
R-2 6.1 The x axis shall be the horizontal axis of the 3B M Y Y Y Y N/A
writing plane, with x coordinates increasing to
the right.
R-3 6.1 The y axis shall be the vertical axis of the 3B M Y Y Y Y N/A
writing plane, with y coordinates increasing
upwards.
R-4 8.2.2 The format ID shall be recorded in four bytes. 1 M Y N N N
The format ID shall consist of three characters
"SDI" followed by Null (00 ) as a string
Hex
terminator.
R-5 10.2 The format ID shall be recorded in four bytes. 1 M N N Y N
The format ID shall consist of three characters
"SCD" followed by Null (00 ) as a string
Hex
terminator.
R-6 8.2.3, The number for the version of this part of 1 M Y N Y N
10.2 ISO/IEC 19794 shall be placed in four bytes.
The version number shall consist of the three
characters “020” followed by Null as a string
terminator (3032 3000 ).
Hex
R-7 8.2.4, The length (in bytes) of the entire BDIR shall 2 M Y N Y N
10.2 be recorded in four bytes. This count shall be
the total length of the BDIR including the
general record header and one or more rep-
resentation records.
R-8 8.2.5, The total number of representation records 2 M Y N Y N
10.2 contained in the BDIR shall be recorded in two
bytes. A minimum of one representation is
required.
R-9 8.2.6, The one-byte certification flag shall indicate 2 M Y N Y N
10.2 whether each Representation Header includes
a certification record. A value of 00 shall
Hex
indicate that no representation contains a
certification record. A value of 01 shall indi-
Hex
cate that all representations contain a certifi-
cation record.
R-10 8.3.1, A Representation Header shall precede each 1 M Y N Y N
10.3.1 representation providing information for that
representation. There shall be one header for
each representation contained in the BDIR.
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ISO/IEC 19794-7:2014/Amd 1:2015(E)
Re- Refer- Requirement summary Lev Sta- Applicable to format IUT Sup- Test
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pres
sion
R-11 8.3.2.2 The total number of bytes in the entire repre-2 M Y N Y N
, sentation, including the Representation
10.3.2. Header, shall be recorded in four bytes.
1
R-12 8.3.2.3 The Gregorian calendar year of the capture 1 M Y N Y N
, date and time field shall be encoded in the
10.3.2. form given in ISO/IEC 19794-1:2011.
1
R-13 8.3.2.3 The month of the capture date and time field 1 M Y N Y N
, shall be encoded in the form given in ISO/IEC
10.3.2. 19794-1:2011.
1
R-14 8.3.2.3 The day of the capture date and time field 1 M Y N Y N
, shall be encoded in the form given in ISO/IEC
10.3.2. 19794-1:2011.
1
R-15 8.3.2.3 The hour of the capture date and time field 1 M Y N Y N
, shall be encoded in the form given in ISO/IEC
10.3.2. 19794-1:2011.
1
R-16 8.3.2.3 The minute of the capture date and time field 1 M Y N Y N
, shall be encoded in the form given in ISO/IEC
10.3.2. 19794-1:2011.
1
R-17 8.3.2.3 The second of the capture date and time field 1 M Y N Y N
, shall be encoded in the form given in ISO/IEC
10.3.2. 19794-1:2011.
1
R-18 8.3.2.3 The millisecond of the capture date and time 1 M Y N Y N
, field shall be encoded in the form given in
10.3.2. ISO/IEC 19794-1:2011.
1
R-19 8.3.2.3 The capture date and time field shall indicate 3C M Y N Y N
, when the capture of this representation started
10.3.2. in Coordinated Universal Time (UTC).
1
R-20 8.3.2.4 The capture device technology ID shall be en-1 M Y N Y N
, coded in one byte. A value of 00 indicates
Hex
10.3.2. unknown or unspecified technology. See
1 Table 3 for the list of possible values.
R-21 8.3.2.4 The capture device technology ID shall indi-3C M Y N Y N
, cate the class of capture device technology
10.3.2. used to acquire the captured biometric
1 sample.
R-22 8.3.2.5 The capture device vendor ID shall be 1 M Y N Y N
, encoded in two bytes. A value of all zeros
10.3.2. shall indicate that the capture device vendor is
1 unreported.
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ISO/IEC 19794-7:2014/Amd 1:2015(E)
Re- Refer- Requirement summary Lev Sta- Applicable to format IUT Sup- Test
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sion
R-23 8.3.2.5 The capture device vendor ID shall be regis-3C M Y N Y N
, tered by IBIA or other approved registration
10.3.2. authority.
1
R-24 8.3.2.6 The capture device type ID shall be encoded 1 M Y N Y N
, in two bytes. A value of all zeros shall indicate
10.3.2. that the capture device type is unreported.
1
R-25 8.3.2.6 The capture device type ID shall be assigned 3C M Y N Y N
, by the registered product owner or other
10.3.2. approved registration authority.
1
R-26 8.3.2.7 A quality record shall begin with a length field. 2 M Y N Y N
, The length field shall consist of one byte. It
10.3.2. shall represent the number of quality blocks as
1 an unsigned integer.
R-27 8.3.2.7 A quality score shall be encoded in one byte 1 M Y N Y N
, as an unsigned integer. Allowed values are
10.3.2.
– 0 to 100 with higher values indicating
1
better quality,
– 255, i.e. ff , for indicating that an attempt
Hex
to calculate a quality score failed.
R-28 8.3.2.7 The quality algorithm vendor ID shall be 1 M Y N Y N
, encoded in two bytes. A value of all zeros
10.3.2. shall indicate that the quality algorithm vendor
1 is unreported.
R-29 8.3.2.7 The quality algorithm vendor ID shall be 3C M Y N Y N
, registered by IBIA or other approved registra-
10.3.2. tion authority.
1
R-30 8.3.2.7 The quality algorithm ID shall be encoded in 1 M Y N Y N
, two bytes. A value of all zeros shall indicate
10.3.2. that the quality algorithm is unreported.
1
R-31 8.3.2.7 The quality algorithm ID shall be registered by 3C M Y N Y N
, IBIA or other approved registration authority.
10.3.2.
1
R-32 8.3.2.8 The channel inclusion field shall consist of two 1 M Y N Y N
.1, bytes.
10.3.2.
1
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ISO/IEC 19794-7:2014/Amd 1:2015(E)
Re- Refer- Requirement summary Lev Sta- Applicable to format IUT Sup- Test
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R-33 8.3.2.8 A bit value of 1 in the channel inclusion field 2 M Y N Y N
.1, shall encode the presence of the
10.3.2. corresponding channel; a bit value of 0 shall
1 encode the absence of the corresponding
channel.
The channel inclusion field shall be followed
by a sequence of channel descriptions for the
channels indicated as present in the channel
inclusion field. The order of the channel
descriptions is determined by the order of indi-
cated inclusion within the channel inclusion
field starting with the X channel. The channel
descriptions are mandatory for all channels
present in the signature/sign time series data
record.
R-34 8.3.2.8 Each bit of the channel inclusion field shall 3A M Y N Y N
.1, correspond to a channel as shown in Table 4.
10.3.2.
1
R-35 8.3.2.8 Each channel description shall begin with a 1 M Y N Y N
.2, preamble. Each channel description preamble
10.3.2. shall consist of one byte.
1
The unused trailing bit of the preamble shall
have value 0 and is reserved by ISO/IEC JTC
1/SC 37 for future use.
R-36 8.3.2.8 Each of the bits 4 through 8 of a channel 2 M Y N Y N
.2, description preamble shall correspond to a
10.3.2. channel attribute as shown in Table 5. A bit
1 value of 1 shall encode the presence of the
corresponding channel attribute; a bit value of
0 shall encode the absence of the correspond-
ing channel attribute. If any of the bits 4
through 8 of a channel description preamble
are set to 1, the preamble shall be followed by
a sequence of channel attributes in the same
order as indicated in the preamble starting
with the scaling value.
R-37 8.3.2.8 A value of 1 for bit 3 of a channel description 2 M Y N Y N
.2, preamble shall indicate that the value of this
10.3.2. channel is constant. If bit 3 of a channel
1 description preamble is set to 1, then this
channel shall be absent in the representation
body even though the representation header
indicates the presence of the channel.
R-38 8.3.2.8 If the channel description of a channel whose 3A M Y N Y N
.2, value is constant contains a scaling value,
10.3.2. then the constant value of this channel shall
1 be 1 divided by the scaling value.
R-39 8.3.2.8 A value of 1 for bit 2 of a channel description 2 M Y N Y N
.2, preamble shall indicate that the linear
10.3.2. component of the regression line for this chan-
1 nel has been removed from this channel.
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ISO/IEC 19794-7:2014/Amd 1:2015(E)
Re- Refer- Requirement summary Lev Sta- Applicable to format IUT Sup- Test
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R-40 8.3.2.8 If present, scaling values shall consist of two 1 O Y N Y N
.3, bytes. The five most significant bits of the first
10.3.2. byte shall constitute the exponent field E, and
1 the remaining 11 bits shall constitute the
fraction field F.
The scaling value s is calculated by
 
F
E16
s1  2
.
 
11
 2 
R-41 8.3.2.8 If present, the minimum and maximum 1 O Y N Y N
.4, possible channel values shall be encoded in
10.3.2. two bytes.
1
R-42 8.3.2.8 If present, the minimum and maximum 3A O Y N Y N
.4, possible channel values shall indicate the
10.3.2. scaled range of values that the deployed
1 capture device may deliver for the cor-
responding channel.
For the minimum and maximum possible
channel values of the Z, T, DT, F, A, E, and R
channels, integer values in the range from 0 to
65 535 are allowed. These values shall be
encoded in two bytes as unsigned integers.
For the minimum and maximum possible
channel values of the X, Y, VX, VY, AX, AY,
TX, and TY channels, integer values in the
range from –32 768 to 32 767 are allowed.
These values shall be encoded in two bytes
as unsigned integers after adding 32 768 to
each value. Hence, for non-negative numbers,
bit 8 of the most significant byte has the value
1; for negative numbers, bit 8 of the most sig-
nificant byte has the value 0. For decoding
these values, 32 768 is to be subtracted from
each recorded value.
R-43 8.3.2.8 If a scaling value is present, the minimum and 3A O Y N Y N
.3, maximum possible channel values are to be
10.3.2. divided by the corresponding scaling value to
1 obtain their actual values.
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ISO/IEC 19794-7:2014/Amd 1:2015(E)
Re- Refer- Requirement summary Lev Sta- Applicable to format IUT Sup- Test
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R-44 8.3.2.8 If present, the average of the channel values 2 O Y N Y N
.5,
, rounded to the
shall be the arithmetic mean c
10.3.2.
nearest integer, of all values c ( 1 i N
i
1
where N is the number of sample points) for
the corresponding channel within a signature/
sign time series data record:
N
1
c ∑c .
i
N
i1
For the averages of the Z, T, DT, F, A, E, and
R channels, integer values in the range from 0
to 65 535 are allowed. These values shall be
encoded in two bytes as unsigned integers.
For the averages of the X, Y, VX, VY, AX, AY,
TX, and TY channels, integer values in the
range from -32 768 to 32 767 are allowed.
These values shall be encoded in two bytes
as unsigned integers after adding 32 768 to
each value. Hence, for non-negative numbers,
bit 8 of the most significant byte has the value
1; for negative numbers, bit 8 of the most sig-
nificant byte has the value 0. For decoding
these values, 32 768 is to be subtracted from
each recorded value.
R-45 8.3.2.8 If a scaling value is present, the average 3A O Y N Y N
.3, channel values are to be divided by the cor-
10.3.2. responding scaling value to obtain their actual
1 values.
R-46 8.3.2.8 If present, the standard deviation of the 2 O Y N Y N
.5, channel values shall be the empirical standard
10.3.2.
deviation  , rounded to the nearest integer,
c
1
of all values c ( 1 i N ) for the cor-
i
responding channel within a signature/sign
time series data record:
N
1
2
  ∑(c - c) .
c i
N
i1
For the standard deviations of all channels,
integer values in the range from 0 to 65 535
are allowed. These values shall be encoded in
two bytes as unsigned integers.
R-47 8.3.2.8 If a scaling value is present, the standard 3A O Y N Y N
.3, deviation values are to be divided by the cor-
10.3.2. responding scaling value to obtain their actual
1 values.
R-48 8.3.2.9 The length field shall consist of three bytes. 1 M Y N Y N
,
10.3.2.
1
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ISO/IEC 19794-7:2014/Amd 1:2015(E)
Re- Refer- Requirement summary Lev Sta- Applicable to format IUT Sup- Test
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Full Com Co XML
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sion
R-49 8.3.2.9 The length field shall indicate the number of 2 M Y N Y N
, sample points as an unsigned integer.
10.3.2.
1
R-50 10.3.2. The compression algorithm ID shall be 1 M N N Y N
2 encoded in one byte. See Table 9 for the list
of possible values.
R-51 10.3.2. The compressed-data length field shall consist 1 M N N Y N
3 of four bytes.
R-52 10.3.2. The compressed-data length field shall denote 2 M N N Y N
3 the total number of bytes in the compressed
data.
R-53 8.3.3.2 Each sample point field shall consist of a 2 M Y N N N
sequence of selected channel values as
indicated by the channel inclusion field. The
order of the channel values is determined by
the order of indicated inclusion within the
channel inclusion field.
R-54 8.3.3.2 For the Z, T, DT, F, Az, El, and R channels, 2 M Y N N N
integer values in the range from 0 to 65 535
are allowed. These values shall be encoded in
two bytes as unsigned integers.
R-55 8.3.3.2 For the X, Y, VX, VY, AX, AY, TX, and TY 2 M Y N N N
channels, integer values in the range from –
32 768 to 32 767 are allowed. These values
shall be encoded in two bytes as unsigned
integers, after adding 32 768 to each value.
Hence, for non-negative numbers, bit 8 of the
most significant byte has the value 1; for
negative numbers, bit 8 of the most significant
byte has the value 0. For decoding these
values, 32 768 is to be subtracted from each
recorded value.
R-56 8.3.3.2 For the S channel, the values 0 and 1 are 2 M Y N N N
allowed. These values shall be encoded in
one byte as unsigned integers.
R-57 8.3.2.8 If a scaling value is present, the channel 3A O Y N Y N
.3, values in the representation body are to be
10.3.2. divided by the corresponding scaling value to
1 obtain their actual values.
R-58 10.3.3. The data to be compressed shall consist of a 2 M N N Y N
1 sequence of difference channels, one for each
channel that is indicated as present by the
channel inclusion field in the representation
header. The sequence of difference channels
shall be compressed using the compression
algorithm indicated by the compression algo-
rithm ID field in the representation header.
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ISO/IEC 19794-7:2014/Amd 1:2015(E)
Re- Refer- Requirement summary Lev Sta- Applicable to format IUT Sup- Test
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R-59 10.3.3. Every difference channel shall start with the 3A M N N Y N
2 initial value c of the channel, encoded as
1
defined in clause 8.3.3.2. This is followed by a
sequence of differences between values at
d  c  c
consecutive sample points
i i1 i
(1 i N 1). Each d shall be encoded in two
i
bytes as an unsigned integer after adding
32768.
R-60 8.3.3.3 The extended data length field shall consist of 1 M Y N Y N
, two bytes.
10.3.3.
3
R-61 8.3.3.3 The extended data length field shall represent 2 M Y N Y N
, the number of bytes in the extended data as
10.3.3. an unsigned integer.
3
R-62 8.3.3.4 The structure of the extended data field is not 1 O Y N Y N
, prescribed by this part of ISO/IEC 19794.
10.3.3.
4
R-63 9.2.1 If present, the comparison algorithm 1 M N Y N N
parameters data object tag is B1 . Its length
Hex
shall be encoded following the Distinguished
Encoding Rules of ASN.1 defined in ISO/IEC
8825-1.
R-64 9.2.3.1 If present, the sequence of channel 1 M N Y N N
descriptions shall begin with a channel inclu-
sion field as defined in clause 8.3.2.8.1.
R-65 9.2.3.2 The channel inclusion field shall be followed 1 M N Y N N
by a sequence of channel descriptions for the
channels indicated as present in the channel
inclusion field. The order of the channel
descriptions is determined by the order of
indicated inclusion within the channel inclusion
field (Table 4) starting with the X channel. The
channel descriptions are mandatory for all
channels present in the signature/sign time
series data block.
R-66 9.2.3.2 Each channel description shall begin with a 1 M N Y N N
preamble as defined in clause 8.3.2.8.2.
R-67 9.2.3.2 If any of the bits 4 through 8 of a channel 1 M N Y N N
description preamble are set to 1, the pre-
amble shall be followed by a sequence of
channel attributes in the same order as
indicated in the preamble starting with the
scaling value.
R-68 9.2.3.3 If present, the meaning and encoding of the 2 M N Y N N
scaling values shall be as defined in clause
8.3.2.8.3.
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ISO/IEC 19794-7:2014/Amd 1:2015(E)
Re- Refer- Requirement summary Lev Sta- Applicable to format IUT Sup- Test
quir ence el tus type sup porte re-
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Full Com Co XML
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pres
sion
R-69 9.2.3.4 If present, the meaning of the minimum and 2 M N Y N N
maximum possible channel values shall be as
defined in clause 8.3.2.8.4.
R-70 9.2.3.4 For the minimum and maximum possible 2 M N Y N N
channel values of the Z, T, DT, F, Az, El, and
R channels, integer values in the range from 0
to 255 are allowed. These values shall be
encoded in one byte as unsigned integers.
R-71 9.2.3.4 For the minimum and maximum possible 2 M N Y N N
channel values of the X, Y, VX, VY, AX, AY,
TX, and TY channels, integer values in the
range from –128 to 127 are allowed. These
values shall be encoded in one byte as
unsigned integers after adding 128 to each
value. Hence, for non-negative numbers, bit 8
of the most significant byte has the value 1; for
negative numbers, bit 8 of the most significant
byte has the value 0. For decoding these
values, 128 is to be subtracted from each
recorded value.
R-72 9.2.3.5 If present, the meaning of the average value 2 M N Y N N
and of the standard deviation of the channel
values shall be as defined in clause 8.3.2.8.5.
R-73 9.2.3.5 For the average values of the Z, T, DT, F, Az, 2 M N Y N N
El, and R channels as well as for the standard
deviations of all channels, integer values in
the range from 0 to 255 are allowed. These
values shall be encoded in one byte as
unsigned integers.
R-74 9.2.3.5 For the mean values of the X, Y, VX, VY, AX, 2 M N Y N N
AY, TX, and TY channels, integer values in
the range from -128 to 127 are allowed. These
values shall be encoded in one byte as un-
signed integers after adding 128 to each
value. Hence, for non-negative numbers, bit 8
of the most significant byte has the value 1; for
negative numbers, bit 8 of the most significant
byte has the value 0. For decoding these val-
ues, 128 is to be subtracted from each
recorded value.
R-75 9.2.2 If there is an upper limit to the number of 2 M N Y N N
sample points, the maximum number of
sample points that the comparison algorithm is
able to process may be indicated in the
comparison algorithm parameters data object.
If present, the maximum number of sample
points shall be encoded as an unsigned
integer.
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10

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ISO/IEC 19794-7:2014/Amd 1:2015(E)
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R-76 9.4 The body of a signature/sign time series data 1 M N Y N N
block consists of a sequence of fields, each of
which consists of a sequence of channel
values at a particular sample point, for sub-
sequent sample points. For each sample
point, the field shall begin with a value for the
mandatory X channel, followed by a value for
the mandatory Y channel, and a sequence of
optional channel values as indicated by the
channel inclusion field in the comparison
algorithm parameters data object.
R-77 9.4 For the Z, T, F, Az, El, and R channels, 2 M N Y N N
integer values in the range from 0 to 255 are
allowed. These values shall be encoded in
one byte as unsigned integers. In the compact
format, the T channel shall contain time data
relative to the preceding sample.
R-78 9.4 For the X, Y, VX, VY, AX, AY, TX, and TY 2 M N Y N N
channels, integer values in the range from –
128 to 127 are allowed. These values shall be
encoded in one byte as unsigned integers
after adding 128 to each value. Hence, for
non-negative numbers, bit 8 has the value 1;
for negative numbers, bit 8 has the value 0.
For decoding these values, 128 is to be
subtracted from each recorded value.
R-79 9.4 For the S channel, integer values in the range 2 M N Y N N
from 0 to 1 are allowed. These values shall be
encoded in one byte as unsigned integers.
R-80 9.3 The tag of a signature/sign time series data 2 M N Y N N
block shall be 5f2e if there is no extended
Hex
data and 7f2e if there is also extended data.
Hex
R-81 9.3 The length of a signature/ sign time series 2 M N Y N N
data block shall be encoded following the
Distinguished Encoding Rules of ASN.1
defined in ISO/IEC 8825-1.
R-82 9.3 If there is extended data, the body of a 1 M N Y N N
signature/sign time series data block shall be
preceded by the tag 81 and a length field.
Hex
R-83 9.3 If there is extended data, it shall follow the 1 M N Y N N
body of a signature/sign time series data block
and shall be preceded by the tag 82 or
Hex
A2 and a length field.
Hex
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ISO/IEC 19794-7:2014/Amd 1:2015(E)
AMD1-7: Rename clause “A.2.1 Conformance test assertions for full format (binary format)”
and ”Table A.2 – Conformance test assertions for full format (binary format)” in “Annex A”
AMD1-8: Rename clause A.2.2 – Conformance test assertions for compact format (binary
format) and ”Table A.3 – Conformance test assertions for compact format (binary format)” in
“Annex A”
AMD1-9: Rename clause “A.2.3 Conformance test assertions for compression format
(binary format) ” and ”Table A.4 – Conformance test assertions for compression format
(binary format)” in “Annex A”
AMD1-10: Add clause ”A.2.4 – Conformance test asserti
...

INTERNATIONAL ISO/IEC
STANDARD 19794-7
Second edition
2014-02-01
AMENDMENT 1
2015-07-15
Information technology — Biometric
data interchange formats —
Part 7:
Signature/sign time series data
AMENDMENT 1: XML encoding
Technologies de l’information — Formats d’échange de données
biométriques —
Partie 7: Données de série chronologique de signature/signe
AMENDEMENT 1: .
Reference number
ISO/IEC 19794-7:2014/Amd.1:2015(E)
©
ISO/IEC 2015

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ISO/IEC 19794-7:2014/Amd.1:2015(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO/IEC 2015, Published in Switzerland
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior
written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of
the requester.
ISO copyright office
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. [phone]
Fax [phone]
[e-mail]
www.iso.org
ii © ISO/IEC 2015 – All rights reserved

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ISO/IEC 19794-7:2014/Amd 1:2015(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 19794-7:2014 was prepared by Joint Technical Committee ISO/IEC JTC 1,
Information technology, Subcommittee SC 37, Biometrics.
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ISO/IEC 19794-7:2014/Amd 1:2015(E)
Information technology — Biometric data interchange
formats — Part 7: Signature/sign time series data
AMENDMENT 1: XML encoding
AMD1-1: Insert the following text as introduction to AMENDMENT 1: XML encoding
Additionally, this part of the ISO/IEC standard supports both binary and XML encoding, to
support a spectrum of user requirement. With XML, this part will meet the requirements
modern IT architectures. With binary encoding this part will also be able to be used in
bandwidth or storage constrained environments. Annex E specifies the schema that XML
encoded signature/sign time series data record must conform to, and Annex F provides an
example of a valid XML encoded signature/sign time series data record.
AMD1-2: Replace in clause “1 Scope” "three data formats" with "three binary data formats"
Replace in the first listing the second bullet point “three data formats” with “three binary data
formats”.
AMD1-3: Add in clause “1 Scope” in the first listing a fourth bullet point"
Add in clause “1 Scope” as fourth bullet point of the first listing following:
- an XML schema definition
AMD1-4: Insert the following text into clause “2 Conformance” as second paragraph
An XML document conforms to this part of ISO/IEC 19794 if it satisfies the format
requirements with respect to its structure, relations among its fields, and relations between
its fields and the underlying input that are specified within Annex E of this part of ISO/IEC
19794.
AMD1-5: Insert the following text in the appropriate alphabetical order of Clause , Normative
reference:
- http://www.w3.org/XML/Schema
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ISO/IEC 19794-7:2014/Amd 1:2015(E)
AMD1-6: Replace ”Table A.1 – Table of requirements” in “Annex A”
Table A.1– Table of requirements
Re- Refer- Requirement summary Lev Sta- Applicable to format IUT Sup- Test
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pres
sion
R-1 6.1 The coordinate system used to express the 3B M Y Y Y Y N/A
pen position shall be a three-dimensional
Cartesian coordinate system.
R-2 6.1 The x axis shall be the horizontal axis of the 3B M Y Y Y Y N/A
writing plane, with x coordinates increasing to
the right.
R-3 6.1 The y axis shall be the vertical axis of the 3B M Y Y Y Y N/A
writing plane, with y coordinates increasing
upwards.
R-4 8.2.2 The format ID shall be recorded in four bytes. 1 M Y N N N
The format ID shall consist of three characters
"SDI" followed by Null (00 ) as a string
Hex
terminator.
R-5 10.2 The format ID shall be recorded in four bytes.
1 M N N Y N
The format ID shall consist of three characters
) as a string
"SCD" followed by Null (00
Hex
terminator.
R-6 8.2.3, The number for the version of this part of 1 M Y N Y N
10.2 ISO/IEC 19794 shall be placed in four bytes.
The version number shall consist of the three
characters “020” followed by Null as a string
terminator (3032 3000 ).
Hex
R-7 8.2.4, The length (in bytes) of the entire BDIR shall 2 M Y N Y N
10.2 be recorded in four bytes. This count shall be
the total length of the BDIR including the
general record header and one or more rep-
resentation records.
R-8 8.2.5, The total number of representation records 2 M Y N Y N
10.2 contained in the BDIR shall be recorded in two
bytes. A minimum of one representation is
required.
R-9 8.2.6, The one-byte certification flag shall indicate 2 M Y N Y N
10.2 whether each Representation Header includes
a certification record. A value of 00 shall
Hex
indicate that no representation contains a
certification record. A value of 01 shall indi-
Hex
cate that all representations contain a certifi-
cation record.
R-10 8.3.1, A Representation Header shall precede each 1 M Y N Y N
10.3.1 representation providing information for that
representation. There shall be one header for
each representation contained in the BDIR.
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sion
R-11 8.3.2.2 The total number of bytes in the entire repre-2 M Y N Y N
, sentation, including the Representation
10.3.2. Header, shall be recorded in four bytes.
1
R-12 8.3.2.3 The Gregorian calendar year of the capture 1 M Y N Y N
, date and time field shall be encoded in the
10.3.2. form given in ISO/IEC 19794-1:2011.
1
R-13 8.3.2.3 The month of the capture date and time field 1 M Y N Y N
, shall be encoded in the form given in ISO/IEC
10.3.2. 19794-1:2011.
1
R-14 8.3.2.3 The day of the capture date and time field 1 M Y N Y N
, shall be encoded in the form given in ISO/IEC
10.3.2. 19794-1:2011.
1
R-15 8.3.2.3 The hour of the capture date and time field 1 M Y N Y N
, shall be encoded in the form given in ISO/IEC
10.3.2. 19794-1:2011.
1
R-16 8.3.2.3 The minute of the capture date and time field 1 M Y N Y N
, shall be encoded in the form given in ISO/IEC
10.3.2. 19794-1:2011.
1
R-17 8.3.2.3 The second of the capture date and time field 1 M Y N Y N
, shall be encoded in the form given in ISO/IEC
10.3.2. 19794-1:2011.
1
R-18 8.3.2.3 The millisecond of the capture date and time 1 M Y N Y N
, field shall be encoded in the form given in
10.3.2. ISO/IEC 19794-1:2011.
1
R-19 8.3.2.3 The capture date and time field shall indicate 3C M Y N Y N
, when the capture of this representation started
10.3.2. in Coordinated Universal Time (UTC).
1
R-20 8.3.2.4 The capture device technology ID shall be en-1 M Y N Y N
, coded in one byte. A value of 00 indicates
Hex
10.3.2. unknown or unspecified technology. See
1 Table 3 for the list of possible values.
R-21 8.3.2.4 The capture device technology ID shall indi-3C M Y N Y N
, cate the class of capture device technology
10.3.2. used to acquire the captured biometric
1 sample.
R-22 8.3.2.5 The capture device vendor ID shall be 1 M Y N Y N
, encoded in two bytes. A value of all zeros
10.3.2. shall indicate that the capture device vendor is
1 unreported.
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ISO/IEC 19794-7:2014/Amd 1:2015(E)
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sion
R-23 8.3.2.5 The capture device vendor ID shall be regis-3C M Y N Y N
, tered by IBIA or other approved registration
10.3.2. authority.
1
R-24 8.3.2.6 The capture device type ID shall be encoded 1 M Y N Y N
, in two bytes. A value of all zeros shall indicate
10.3.2. that the capture device type is unreported.
1
R-25 8.3.2.6 The capture device type ID shall be assigned 3C M Y N Y N
, by the registered product owner or other
10.3.2. approved registration authority.
1
R-26 8.3.2.7 A quality record shall begin with a length field. 2 M Y N Y N
, The length field shall consist of one byte. It
10.3.2. shall represent the number of quality blocks as
1 an unsigned integer.
R-27 8.3.2.7 A quality score shall be encoded in one byte 1 M Y N Y N
, as an unsigned integer. Allowed values are
10.3.2.
– 0 to 100 with higher values indicating
1
better quality,
– 255, i.e. ff , for indicating that an attempt
Hex
to calculate a quality score failed.
R-28 8.3.2.7 The quality algorithm vendor ID shall be 1 M Y N Y N
, encoded in two bytes. A value of all zeros
10.3.2. shall indicate that the quality algorithm vendor
1 is unreported.
R-29 8.3.2.7 The quality algorithm vendor ID shall be 3C M Y N Y N
, registered by IBIA or other approved registra-
10.3.2. tion authority.
1
R-30 8.3.2.7 The quality algorithm ID shall be encoded in 1 M Y N Y N
, two bytes. A value of all zeros shall indicate
10.3.2. that the quality algorithm is unreported.
1
R-31 8.3.2.7 The quality algorithm ID shall be registered by 3C M Y N Y N
, IBIA or other approved registration authority.
10.3.2.
1
R-32 8.3.2.8 The channel inclusion field shall consist of two 1 M Y N Y N
.1, bytes.
10.3.2.
1
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R-33 8.3.2.8 A bit value of 1 in the channel inclusion field 2 M Y N Y N
.1, shall encode the presence of the
10.3.2. corresponding channel; a bit value of 0 shall
1 encode the absence of the corresponding
channel.
The channel inclusion field shall be followed
by a sequence of channel descriptions for the
channels indicated as present in the channel
inclusion field. The order of the channel
descriptions is determined by the order of indi-
cated inclusion within the channel inclusion
field starting with the X channel. The channel
descriptions are mandatory for all channels
present in the signature/sign time series data
record.
R-34 8.3.2.8 Each bit of the channel inclusion field shall 3A M Y N Y N
.1, correspond to a channel as shown in Table 4.
10.3.2.
1
R-35 8.3.2.8 Each channel description shall begin with a 1 M Y N Y N
.2, preamble. Each channel description preamble
10.3.2. shall consist of one byte.
1
The unused trailing bit of the preamble shall
have value 0 and is reserved by ISO/IEC JTC
1/SC 37 for future use.
R-36 8.3.2.8 Each of the bits 4 through 8 of a channel 2 M Y N Y N
.2, description preamble shall correspond to a
10.3.2. channel attribute as shown in Table 5. A bit
1 value of 1 shall encode the presence of the
corresponding channel attribute; a bit value of
0 shall encode the absence of the correspond-
ing channel attribute. If any of the bits 4
through 8 of a channel description preamble
are set to 1, the preamble shall be followed by
a sequence of channel attributes in the same
order as indicated in the preamble starting
with the scaling value.
R-37 8.3.2.8 A value of 1 for bit 3 of a channel description 2 M Y N Y N
.2, preamble shall indicate that the value of this
10.3.2. channel is constant. If bit 3 of a channel
1 description preamble is set to 1, then this
channel shall be absent in the representation
body even though the representation header
indicates the presence of the channel.
R-38 8.3.2.8 If the channel description of a channel whose 3A M Y N Y N
.2, value is constant contains a scaling value,
10.3.2. then the constant value of this channel shall
1 be 1 divided by the scaling value.
R-39 8.3.2.8 A value of 1 for bit 2 of a channel description 2 M Y N Y N
.2, preamble shall indicate that the linear
10.3.2. component of the regression line for this chan-
1 nel has been removed from this channel.
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ISO/IEC 19794-7:2014/Amd 1:2015(E)
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R-40 8.3.2.8 If present, scaling values shall consist of two 1 O Y N Y N
.3, bytes. The five most significant bits of the first
10.3.2. byte shall constitute the exponent field E, and
1 the remaining 11 bits shall constitute the
fraction field F.
The scaling value s is calculated by
 
F
E16
s1  2
.
 
11
 2 
R-41 8.3.2.8 If present, the minimum and maximum 1 O Y N Y N
.4, possible channel values shall be encoded in
10.3.2. two bytes.
1
R-42 8.3.2.8 If present, the minimum and maximum 3A O Y N Y N
.4, possible channel values shall indicate the
10.3.2. scaled range of values that the deployed
1 capture device may deliver for the cor-
responding channel.
For the minimum and maximum possible
channel values of the Z, T, DT, F, A, E, and R
channels, integer values in the range from 0 to
65 535 are allowed. These values shall be
encoded in two bytes as unsigned integers.
For the minimum and maximum possible
channel values of the X, Y, VX, VY, AX, AY,
TX, and TY channels, integer values in the
range from –32 768 to 32 767 are allowed.
These values shall be encoded in two bytes
as unsigned integers after adding 32 768 to
each value. Hence, for non-negative numbers,
bit 8 of the most significant byte has the value
1; for negative numbers, bit 8 of the most sig-
nificant byte has the value 0. For decoding
these values, 32 768 is to be subtracted from
each recorded value.
R-43 8.3.2.8 If a scaling value is present, the minimum and 3A O Y N Y N
.3, maximum possible channel values are to be
10.3.2. divided by the corresponding scaling value to
1 obtain their actual values.
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R-44 8.3.2.8 If present, the average of the channel values 2 O Y N Y N
.5,
, rounded to the
shall be the arithmetic mean c
10.3.2.
nearest integer, of all values c ( 1 i N
i
1
where N is the number of sample points) for
the corresponding channel within a signature/
sign time series data record:
N
1
c ∑c .
i
N
i1
For the averages of the Z, T, DT, F, A, E, and
R channels, integer values in the range from 0
to 65 535 are allowed. These values shall be
encoded in two bytes as unsigned integers.
For the averages of the X, Y, VX, VY, AX, AY,
TX, and TY channels, integer values in the
range from -32 768 to 32 767 are allowed.
These values shall be encoded in two bytes
as unsigned integers after adding 32 768 to
each value. Hence, for non-negative numbers,
bit 8 of the most significant byte has the value
1; for negative numbers, bit 8 of the most sig-
nificant byte has the value 0. For decoding
these values, 32 768 is to be subtracted from
each recorded value.
R-45 8.3.2.8 If a scaling value is present, the average 3A O Y N Y N
.3, channel values are to be divided by the cor-
10.3.2. responding scaling value to obtain their actual
1 values.
R-46 8.3.2.8 If present, the standard deviation of the 2 O Y N Y N
.5, channel values shall be the empirical standard
10.3.2.
deviation  , rounded to the nearest integer,
c
1
of all values c ( 1 i N ) for the cor-
i
responding channel within a signature/sign
time series data record:
N
1
2
  ∑(c - c) .
c i
N
i1
For the standard deviations of all channels,
integer values in the range from 0 to 65 535
are allowed. These values shall be encoded in
two bytes as unsigned integers.
R-47 8.3.2.8 If a scaling value is present, the standard 3A O Y N Y N
.3, deviation values are to be divided by the cor-
10.3.2. responding scaling value to obtain their actual
1 values.
R-48 8.3.2.9 The length field shall consist of three bytes. 1 M Y N Y N
,
10.3.2.
1
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sion
R-49 8.3.2.9 The length field shall indicate the number of 2 M Y N Y N
, sample points as an unsigned integer.
10.3.2.
1
R-50 10.3.2. The compression algorithm ID shall be 1 M N N Y N
2 encoded in one byte. See Table 9 for the list
of possible values.
R-51 10.3.2. The compressed-data length field shall consist 1 M N N Y N
3 of four bytes.
R-52 10.3.2. The compressed-data length field shall denote 2 M N N Y N
3 the total number of bytes in the compressed
data.
R-53 8.3.3.2 Each sample point field shall consist of a 2 M Y N N N
sequence of selected channel values as
indicated by the channel inclusion field. The
order of the channel values is determined by
the order of indicated inclusion within the
channel inclusion field.
R-54 8.3.3.2 For the Z, T, DT, F, Az, El, and R channels, 2 M Y N N N
integer values in the range from 0 to 65 535
are allowed. These values shall be encoded in
two bytes as unsigned integers.
R-55 8.3.3.2 For the X, Y, VX, VY, AX, AY, TX, and TY 2 M Y N N N
channels, integer values in the range from –
32 768 to 32 767 are allowed. These values
shall be encoded in two bytes as unsigned
integers, after adding 32 768 to each value.
Hence, for non-negative numbers, bit 8 of the
most significant byte has the value 1; for
negative numbers, bit 8 of the most significant
byte has the value 0. For decoding these
values, 32 768 is to be subtracted from each
recorded value.
R-56 8.3.3.2 For the S channel, the values 0 and 1 are 2 M Y N N N
allowed. These values shall be encoded in
one byte as unsigned integers.
R-57 8.3.2.8 If a scaling value is present, the channel 3A O Y N Y N
.3, values in the representation body are to be
10.3.2. divided by the corresponding scaling value to
1 obtain their actual values.
R-58 10.3.3. The data to be compressed shall consist of a 2 M N N Y N
1 sequence of difference channels, one for each
channel that is indicated as present by the
channel inclusion field in the representation
header. The sequence of difference channels
shall be compressed using the compression
algorithm indicated by the compression algo-
rithm ID field in the representation header.
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ISO/IEC 19794-7:2014/Amd 1:2015(E)
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R-59 10.3.3. Every difference channel shall start with the 3A M N N Y N
2 initial value c of the channel, encoded as
1
defined in clause 8.3.3.2. This is followed by a
sequence of differences between values at
d  c  c
consecutive sample points
i i1 i
(1 i N 1). Each d shall be encoded in two
i
bytes as an unsigned integer after adding
32768.
R-60 8.3.3.3 The extended data length field shall consist of 1 M Y N Y N
, two bytes.
10.3.3.
3
R-61 8.3.3.3 The extended data length field shall represent 2 M Y N Y N
, the number of bytes in the extended data as
10.3.3. an unsigned integer.
3
R-62 8.3.3.4 The structure of the extended data field is not 1 O Y N Y N
, prescribed by this part of ISO/IEC 19794.
10.3.3.
4
R-63 9.2.1 If present, the comparison algorithm 1 M N Y N N
parameters data object tag is B1 . It
...