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ISO/IEC 29794-5:2025

(Main)

Information technology — Biometric sample quality — Part 5: Face image data

Information technology — Biometric sample quality — Part 5: Face image data

This document establishes requirements on implementations that quantify how a face image’s properties conform with those of canonical face images, for example those specified in ISO/IEC 39794-5:2019, Clause D.1, for three use-cases: 1) collection of reference samples for ID documents; 2) sample system enrolment; and 3) probes for instantaneous response. This document also establishes terms and definitions for quantifying face image quality and specifies methods for quantifying the quality of face images. This document does not establish requirements on: — assessing the quality of pairs or sequences of images; NOTE This document establishes requirements for software that inspects exactly one image. This document does not establish requirements for software that compares two or more images (such as biometric recognition). However, the computations of this document can be applied separately to each image in a pair or sequence. — assessing the quality of 3D captures; — encodings of face image quality data; — performance evaluation of face image quality assessment algorithms. The use cases within scope of this document primarily address the assessment of images from data capture subjects who consent to processing of their biometric data, or for whom biometric capture is operationally authorized.

Technologies de l'information — Qualité d'échantillon biométrique — Partie 5: Données d'image de face

General Information

Status
Published
Publication Date
15-Apr-2025
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/WG 3 - Biometric data interchange formats
Current Stage
6060 - International Standard published
Start Date
16-Apr-2025
Due Date
23-Mar-2025
Completion Date
16-Apr-2025
Ref Project

Relations

Revises
ISO/IEC TR 29794-5:2010 - Information technology — Biometric sample quality — Part 5: Face image data
Effective Date
08-May-2020

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ISO/IEC 29794-5:2025 - Information technology — Biometric sample quality — Part 5: Face image data Released:16. 04. 2025ISO/IEC 29794-5:2025 - Information technology — Biometric sample quality — Part 5: Face image data Released:16. 04. 2025
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ISO/IEC 29794-5:2025 - Information technology — Biometric sample quality — Part 5: Face image data Released:16. 04. 2025
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63 pages
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International
Standard
ISO/IEC 29794-5
First edition
Information technology —
2025-04
Biometric sample quality —
Part 5:
Face image data
Technologies de l'information — Qualité d'échantillon
biométrique —
Partie 5: Données d'image de face
Reference number
© ISO/IEC 2025
All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
© ISO/IEC 2025 – All rights reserved
ii
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Abbreviated terms . 4
5 Conformance . 4
6 Common computations . 6
6.1 Overview .6
6.2 Conversion of 16 bits per channel images to 8 bits per channel images .7
6.3 Conversion of high bit-depth images to 8 bit greyscale or 24 bit colour images .7
6.4 Face detection.7
6.5 Face landmark estimation .8
6.6 Landmarked region segmentation .10
6.7 Face alignment .11
6.8 Face parsing . 12
6.9 Face occlusion segmentation . 13
6.10 Computing eye centres and inter-eye distance .14
6.11 Head pose estimation . 15
6.12 Conversion of 8-bits-per-channel colour images to luminance .16
6.13 Conversion of 8-bits-per-channel colour images to CIELAB space .17
6.14 Handling of greyscale images . .18
6.15 Luminance histogram .18
6.16 Entropy .18
6.17 Expressing binary quantities as continuous values .18
6.18 Representation and arithmetic of real and integer numbers .18
6.19 Normalization of image colour values .19
7 Quality measures . 19
7.1 General .19
7.2 Quality score (unified) . . 20
7.2.1 Description . 20
7.2.2 Computation of the native quality measure . 20
7.2.3 Mapping the computation result to the target range of the quality component .21
7.3 Capture-related quality components .21
7.3.1 General .21
7.3.2 Background uniformity . .21
7.3.3 Illumination uniformity . 22
7.3.4 Moments of the luminance distribution . 23
7.3.5 Under-exposure prevention . 25
7.3.6 Over-exposure prevention . 25
7.3.7 Dynamic range . 26
7.3.8 Sharpness . . .27
7.3.9 No compression artefacts . 28
7.3.10 Natural colour . 29
7.4 Subject-related quality components . 30
7.4.1 General . 30
7.4.2 Single face present . 30
7.4.3 Eyes open .31
7.4.4 Mouth closed .32
7.4.5 Eyes visible .32
7.4.6 Mouth occlusion prevention . 33
7.4.7 Face occlusion prevention . 34

© ISO/IEC 2025 – All rights reserved
iii
7.4.8 Inter-eye distance . . 34
7.4.9 Head size . 35
7.4.10 Crop of the face image . 36
7.4.11 Head pose . 38
7.4.12 Expression neutrality . 39
7.4.13 No head covering . 40
8 Face image quality block . 41
8.1 Binary encoding .41
8.2 XML encoding .41
8.3 Organization identifiers .41
8.4 Algorithm identifiers .41
Annex A (normative) Conformance test assertions .44
Annex B (informative) Quantitative goal for face image QAAs .50
Annex C (informative) Applications of quality measures .53
Annex D (informative) Quality requirements with no quality measure .56
Annex E (informative) OFIQ testing reports .58
Annex F (informative) Guidance for sequential use of ISO/IEC 29794-5 quality components .59
Bibliography .60

© ISO/IEC 2025 – All rights reserved
iv
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