ISO/IEC 39794-4:2019/Amd 1:2023

INTERNATIONAL ISO/IEC
STANDARD 39794-4
First edition
2019-12
AMENDMENT 1
2023-08
Information technology — Extensible
biometric data interchange formats —
Part 4:
Finger image data
AMENDMENT 1: Extension towards
improved interoperability with ANSI/
NIST-ITL
Reference number
ISO/IEC 39794-4:2019/Amd. 1:2023(E)
© ISO/IEC 2023
ISO/IEC 39794-4:2019/Amd. 1:2023(E)
© ISO/IEC 2023
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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Published in Switzerland
ii
© ISO/IEC 2023 – All rights reserved

ISO/IEC 39794-4:2019/Amd. 1:2023(E)
Foreword
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Commission) form the specialized system for worldwide standardization. National bodies that are
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This document was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology,
Subcommittee SC 37, Biometrics.
A list of all parts in the ISO/IEC 39794 series can be found on the ISO and IEC websites.
Any feedback or questions on this document should be directed to the user’s national standards
body. A complete listing of these bodies can be found at www.iso.org/members.html and
www.iec.ch/national-committees.
iii
© ISO/IEC 2023 – All rights reserved

ISO/IEC 39794-4:2019/Amd. 1:2023(E)
Information technology — Extensible biometric data
interchange formats —
Part 4:
Finger image data
AMENDMENT 1: Extension towards improved interoperability
with ANSI/NIST-ITL
7.3
Replace:
“The year shall be the year of the publication of this document.”
with:
“The year shall be the year of the publication of the standard or amendment or corrigendum that
specifies the used version of the format.”

8.2
Add:
“The encoding example in Clause B.2 is available at https:// standards .iso .org/ iso -iec/ 39794/ -4/ ed -1/
en. The XSD in Clause A.4 extends the XSD in Clause A.2 by allowing the use of the same palm position
[3]
codes and impression codes as ANSI/NIST ITL 1. The XSD in Clause A.4 and the encoding example in
Clause B.3 are available at https:// standards .iso .org/ iso -iec/ 39794/ -4/ ed -1/ en/ amd/ 1.”

Annex A
Insert the following text as Clause A.3.
A.3  ANSI-NIST ITL Harmonized ASN.1 module for tagged binary encoding
ISO-IEC-39794-4-ed-1-v2 {iso(1) standard(0) iso-iec-39794(39794) part-4(4) ed-1(1) v2(2)
iso-iec-39794-4(0)}
-- Permission is hereby granted, free of charge in perpetuity, to any person
-- obtaining a copy of this ASN.1 module, to use, copy, modify, merge and
-- distribute free of charge, copies of the ASN.1 module for the purposes of
-- developing, implementing, installing and using software based on the ASN.1
-- module, and to permit persons to whom the ASN.1 module is furnished to do so,
-- subject to the following conditions:
--
-- THE ASN.1 MODULE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-- IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-- FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
--
-- IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
-- DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
-- OTHERWISE, ARISING FROM, OUT OF, OR IN CONNECTION WITH THE ASN.1 MODULE OR THE
© ISO/IEC 2023 – All rights reserved

ISO/IEC 39794-4:2019/Amd. 1:2023(E)
-- USE OR OTHER DEALINGS IN THE ASN.1 MODULE.

DEFINITIONS IMPLICIT TAGS ::= BEGIN

IMPORTS
QualityBlocks,
ScoreOrError,
RegistryIdBlock,
CertificationIdBlocks,
CaptureDateTimeBlock,
PADDataBlock,
VersionBlock,
CoordinateCartesian2DUnsignedShortBlock,
ExtendedDataBlock
FROM ISO-IEC-39794-1-ed-1-v1;
PositionCode ::= ENUMERATED {
unknownPosition(0),
rightThumbFinger(1),
rightIndexFinger(2),
rightMiddleFinger(3),
rightRingFinger(4),
rightLittleFinger(5),
leftThumbFinger(6),
leftIndexFinger(7),
leftMiddleFinger(8),
leftRingFinger(9),
leftLittleFinger(10),
rightFourFingers(13),
leftFourFingers(14),
bothThumbFingers(15),
rightExtraDigitFinger(16),
leftExtraDigitFinger(17),
unknownFrictionRidge(18),
entireJointImage(19),
unknownPalm(20),
rightFullPalm(21),
rightWritersPalm(22),
rightLowerPalm(23),
rightUpperPalm(24),
rightOtherPalm(25),
rightInterdigital(26),
rightThenar(27),
rightHypothenar(28),
leftFullPalm(29),
leftWritersPalm(30),
leftLowerPalm(31),
leftUpperPalm(32),
leftOtherPalm(33),
leftInterdigital(34),
leftThenar(35),
leftHypothenar(36),
rightGrasp(37),
leftGrasp(38),
rightIndexMiddleFingers(40),
rightMiddleRingFingers(41),
rightRingLittleFingers(42),
leftIndexMiddleFingers(43),
leftMiddleRingFingers(44),
leftRingLittleFingers(45),
rightIndexLeftIndexFingers(46),
rightIndexMiddleRingFingers(47),
rightMiddleRingLittleFingers(48),
leftIndexMiddleRingFingers(49),
leftMiddleRingLittleFingers(50),
rightFourFingertips(51),
leftFourFingertips(52),
rightFingertips(53),
leftFingertips(54),
leftMiddleIndexRightIndexMiddleFingers(55),
unknownSole(60),
© ISO/IEC 2023 – All rights reserved

ISO/IEC 39794-4:2019/Amd. 1:2023(E)
rightSole(61),
leftSole(62),
unknownToe(63),
rightBigToe(64),
rightSecondToe(65),
rightMiddleToe(66),
rightFourthToe(67),
rightLittleToe(68),
leftBigToe(69),
leftSecondToe(70),
leftMiddleToe(71),
leftFourthToe(72),
leftLittleToe(73),
rightFrontBallFoot(74),
rightBackHeelFoot(75),
leftFrontBallFoot(76),
leftBackHeelFoot(77),
rightMiddleFoot(78),
leftMiddleFoot(79),
rightCarpalDelta(81),
leftCarpalDelta(82),
rightFullWithWriterPalm(83),
leftFullWithWriterPalm(84),
rightBracelet(85),
leftBracelet(86),
otherPosition(999)
}
AnsiNistItlPalmPositionCode ::= ENUMERATED {
leftFullPalm(23),
leftWritersPalm(24),
rightLowerPalm(25),
rightUpperPalm(26),
leftLowerPalm(27),
leftUpperPalm(28),
rightOtherPalm(29),
leftOtherPalm(30),
rightInterdigital(31),
rightThenar(32),
rightHypothenar(33)
}
PositionExtensionBlock ::= SEQUENCE {
fallback [0] PositionCode,
...,
[[2022: -- added in ISO/IEC 39794-4:2019/Amd.1:2022
ansiNistItlPalmPositionCode [1] AnsiNistItlPalmPositionCode OPTIONAL
]]
}
Position ::= CHOICE {
code [0] PositionCode,
extensionBlock [1] PositionExtensionBlock
}
ImpressionCode ::= ENUMERATED {
plainContact(0),
rolledContact(1),
latentImage(4),
swipeContact(8),
stationarySubjectContactlessPlain(24),
stationarySubjectContactlessRolled(25),
movingSubjectContactlessPlain(41),
movingSubjectContactlessRolled(42),
otherImpression(28),
unknownImpression(29)
}
AnsiNistItlImpressionCode ::= ENUMERATED {
movingSubjectContactlessRolled(41),
movingSubjectContactlessPlain(42)
© ISO/IEC 2023 – All rights reserved

ISO/IEC 39794-4:2019/Amd. 1:2023(E)
}
ImpressionExtensionBlock ::= SEQUENCE {
fallback [0] ImpressionCode,
...,
[[2022: -- added in ISO/IEC 39794-4:2019/Amd.1:2022
ansiNistItlImpressionCode [1] AnsiNistItlImpressionCode OPTIONAL
]]
}
Impression ::= CHOICE {
code [0] ImpressionCode,
extensionBlock [1] ImpressionExtensionBlock
}
CaptureDeviceTechnologyIdCode ::= ENUMERATED {
unknownCaptureDeviceTechnology(0),
otherCaptureDeviceTechnology(1),
scannedInkOnPaper(2),
opticalTIRBrightField(3),
opticalTIRDarkField(4),
opticalImage(5),
opticalLowFrequency3DMapped(6),
opticalHighFrequency3DMapped(7),
capacitive(9),
capacitiveRF(10),
electroLuminescence(11),
reflectedUltrasonic(12),
impediographicUltrasonic(13),
thermal(14),
directPressure(1
...