ISO/IEC INTERNATIONAL STANDARD 19794-4 Second edition 2011-12-15 Information technology Biometric data interchange formats - Part 4: Finger image data Technologies de I'information - Formats d'echange de données biométriques- Partie 4: Données d'image du doigt Reference number ISO/IEC 19794-4:2011(E) IEC ISO @ ISO/IEC 2011 py IHS under ted without license from IHS Not for Resale ISO/IEC19794-4:2011(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 nited without license from IHS Not for Resale ISO/IEC 19794-4:2011(E) Contents Page Foreword Introduction 1 Scope 2 Conformance 3 Normative references 4 Terms and definitions 2 5 Abbreviated terms 6 Data conventions... 6.1 Byte and bit ordering 6.2 Scan sequence .... 3 7 Image acquisition requirements. 7.1 General ....... 3 7.2 Pixel aspect ratio 7.3 Bit-depth. 7.4 Grayscale data 7.5 Dynamic range. 7.6 Capture device spatial sampling rate... 7.7 Image spatial sampling rate, 7.8 Fingerprintimagelocation 7.9 Palm image location. 8 Finger image record format.. .5 8.1 Record structure... 8.2 Finger image general header .6 8.3 Finger/palm image representation header 8.4 Extended data ... 18 9 Registered format type identifiers . .23 Annex A (normative) Conformance test methodology . ..24 AnnexB(normative)Capturedevicecertifications.. ..25 Annex C (informative) Finger image data record example, 49 Annex D (informative) Conditions for capturing finger image data.. .51 Annex E (normative) wsQ Gray-scale fingerprint image compression specification .60 Bibliography.. .91 Figures Figure 1 - Order of scanned lines .. 4 Figure 2—Finger image record structure ..6 Figure 3 Order and size of fields in the finger image record.. Figure 4 Image quality layout. 13 Figure 5 - Finger orientation for segmentation 22 ii Copyrightintenational Oganizainfrstandardization All rights reserved Not for Resale ISO/IEC 19794-4:2011(E) Tables Table 1 General record header. Table 2 - Finger image representation header record.. Table 3 Image and extended data .. Table 4 Capture device technology... Table 5 Identifiers for certification schemes specified in the annexes Table 6 Finger position codes . 15 Table 7 Multiple finger position codes.. Table 8 Palm codes... .16 Table 9 Compression algorithm codes.. Table 1o - Finger and palm impression codes ... .18 Table 11 - Extended data area type codes ... Table 12 - Segmentation data .. .20 Table 13 — Annotation data . 22 Table 14 Format Type ldentifiers 23 @ ISO/IEC 2011-All rights reserved Not for Resale ISO/IEC 19794-4:2011(E) Foreword 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 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/lEC 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