INTERNATIONAL ISO/IEC STANDARD 19794-2 Second edition 2011-12-15 Information technology Biometric data interchange formats - Part 2: Finger minutiae data Technologies de I'information - Formats d'échange de donnees biométriques- Partie 2: Données du point caracteristique du doigt Reference number ISO/IEC 19794-2:2011(E) ISo IEC @ ISO/IEC 2011 y IHS under itted without license from IHS Not for Resale ISO/IEC 19794-2:2011(E) COPYRIGHTPROTECTEDDOCUMENT ISO/IEC2011 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, IsO's member body in the country of the requester. ISO copyright office Case postale 56. CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland @ ISO/IEC 2011 - All rights reserved py IHS unde itted without license from IHS Not for Resale ISO/IEC 19794-2:2011(E) Contents Page Foreword Introduction ..vii 1 Scope 2 Conformance 3 Normative references 4 Terms and definitions 2 5 Abbreviated terms . 6 Minutiae extraction.... 6.1 Purpose.. 6.2 Minutia description. 6.3 Minutia type.... 6.4 Minutia location 6.5 Minutiae direction.. 6.6 Core and delta placement... 6.7 Encoding of multibyte quantities 7 Finger minutiae format types .... 7.1 Overview... 7.2 Record format..... 7.3 On-card comparison format .... 8 8 Finger minutiae record format 8.1 Introduction.. 8.2 Record organization... 8.3 General header ...... 10 8.4 Finger minutiae representation format .. 11 8.5 Extended data ... 21 9 Finger minutiae on-card comparison format.... 29 9.1 Purpose ... 29 9.2 On-card comparison format....... .30 9.3 Number of minutiae and truncation... 9.4 Minutiae order... .32 9.5 Usage of extended data for the on-card comparison format.. 34 10 Registered format type identifiers .. 36 Annex A (normative) Conformance test methodology ... 37 Annex B (normative) Record format diagrams, 38 Annex C (informative) Example data record .. ..41 Annex D (informative) Handling of finger minutiae card formats ... 45 Annex E (normative) Capture device certifications.... Annex F (normative) Detailed description of finger minutiae location, direction, and type .... Bibliography... ...93 ii Not for Resale ISO/IEC 19794-2:2011(E) Figures Figure 1 Coordinate system Figure 2 - Location and direction of a ridge ending (encoded as valley skeleton bifurcation point) ... Figure 3 - Location and direction of a ridge bifurcation (encoded as ridge skeleton bifurcation point)..... Figure 4 Location and direction of a ridge skeleton endpoint . Figure 5 Example core and delta placement Figure 6 - Image quality layout 16 Figure 7 - Example ridge count data .23 Figure 8 Eight-minutiae neighbourhood 24 Figure 9 Four-minutiae neighbourhood Tables Table 1 — Format type options Table 2 — General header . Table 3 Finger minutiae representation format. 2 Table 4 Extended data areas Table 5 — Capture device technology ID. .16 Table 6 ldentifiers for certification schemes specified in the annexes 18 Table 7 Finger position codes Table 8 - Finger impression codes . Table 9 Qualified finger minutia pixel record format 20 Table 10 Finger minutia pixel record format 21 Table 11 Extended data area type codes . ..22 Table 12 - Ridge count extraction method codes.... Table 13 Example ridge count data (non-specific extraction method, RCE method = 00Hex). .26 Table 14 On-card biometric comparison format... ..30 Table 15 DO Biometric comparison algorithm parameter: .31 Table 16 Data object for number of minutiae 32 Table 17 Data object for minutiae order.. ..32 @ ISO/IEC 2011 - All rights reserved ational Organization for Standardizatior Not for Resale ISO/IEC 19794-2:2011(E) Table 18—Values forminutiae order indication Table 19 Biometric data template 35 Table 20 - Encoding of feature handling indicator ..36 Table 21 - Format type identifiers , ...36 Table E.1 - Preferred capture sizes .48 Table E.2 MTF Requireme