IEC International ISO Standard ISO/IEC29794-4 Information technology- Second edition 2024-09 Biometric sample quality Part 4: Finger image data Technologiesde linformation-Qualited'échantillon biometrique Partie 4:Données d'image de doigt B9c29b:2024(en) OISO/IEC2024 ISO/IEC29794-4:2024(en) COPYRIGHT PROTECTED DOCUMENT ISO/IEC2024 Al rights reserved.Unless otherwise specified,or required in the context of its implementation,no part of this publication may or ISO's member body in the country of the requester. ISO copyright office CP401-Ch.de Blandonnet8 CH-1214 Vermier,Geneva Phone:+41227490111 Email:[email protected] Website: www.iso.org Published in Switzerland ISO/IEC2024-All rights reserved ii ISO/IEC29794-4:2024( en) Contents Page Foreword Introductio 1 Scope 2 references Normative 3 Terms and definitions 4 Abbreviated terms 5 Conformance 6 Finger image quality measures 6.1 Overview 6.1.1 General 6.1.2 Methods for mapping to the desired value range 6.1.3 Constituent of local quality measures 6.1.4 Constituent of global quality measures Image 6.1.5 preprocessing 6.1.6 Image examples 6.2 Normative contributive quality components 6.2.1 Genera certainty 6.2.2 Orientation level 6.2.3 Local clarity 6.2.4 Frequency (FDA) domain analysis 6.2.5 Ridge valley uniformity 6.2.6 Orientation flow 6.2.7 MU 6.2.8 MMB 9 6.2.9 Minutiae count in finger image 6.2.10 Minutiae count in centre ofmass region 20 6.2.11 Minutiae quality based on local image mean 20 6.2.12 Minutiae quality based on local orientation certainty level .21 6.2.13 Region of interest image emean 6.2.14 Region of interest orientation map coherence sum 6.2.15 Region of interest relative orientation map coherence sum 6.2.16 Quality feature vector composition 25 6.3 Non-normative quality measures 28 6.3.1 General 28 6.3.2 Radial power spectrum 29 6.3.3 filter bank Gabor 30 6.4 Unified quality score 32 6.4.1 Methodology for combining quality components 32 6.4.2 Training method 32 Finger 7 image quality block 33 7.1 Binary encoding 33 7.2 XML encoding 33 7.3 Quality algorithm identifiers 33 assertions AnnexA(normative）Conformance test Annex B(informative ）Factors influencing fingerprint image quality 57 Annex C(informative）Area consideration .59 Bibliography 60 ISO/IEC2024-Allrights reserved ii