ISO/IEC INTERNATIONAL STANDARD 19794-6 First edition 2005-06-01 Information technology Biometric data interchange formats - Part 6: Iris image data Technologies de I'information - Formats d'échange de données biometriques Partie 6: Données d'image de Il'iris Reference number ISO/IEC 19794-6:2005(E) IEC OSI Copyright International Organization for Standardization @ISO/IEC2005 Not for Resale ISO/IEC 19794-6:2005(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by IsO member bodies. In ?ISO/IEC2005 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either isO at the address below or IsO's member body in the country of the requester. ISO copyright office Case postale 56. CH-1211Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland yhematinaganzainfandardizatio @ISO/IEC2005-Allrightsreserved vithout license from IHS Not for Resale ISO/IEC 19794-6:2005(E) Contents Page Foreword Introduction 1 Scope 2 Conformance.. Normative references 4 Terms and definitions. 5 Symbols and abbreviated terms ... 3 6 Iris image format specification .. 6.1 General 6.2 Imagecompression 6.2.1 General 6.2.2 Rawformat 6.2.3 Losslesscompressionformat 6.2.4 Compressed format. 6.3 Image pre-processing... 6.3.1 Rectilinear image pre-processing.. 6.3.2 Polar image pre-processing.... 6.4 Iris image biometric data block. 6.5 Iris header structures 6.5.1 Irisrecordheaderstructure 6.5.2 Iris biometric subtype header structure.. 6.5.3 Iris image header structure .. 6.5.4 Header constants... Annex A (informative) Iris image capture. 13 A.1 Image quality.. .13 A.1.1 General 13 A.1.2 Unacceptable quality .. A.1.3 Low quality. 13 A.1.4 Medium quality A.1.5 High quality 14 A.1.6 Focus quality. 44 A.2 Greyscale density 14 A.3 Illumination A.4 Contrast A.5 Visible iris. 15 A.6 Pixel aspect ratio A.7 Image scale... 15 A.8 Optical distortion 16 A.9 Noise... 16 A.10 Image orientation. 16 A.11 Presentation. 17 Annex B (informative) Sample image data records .. .18 B.1 Rectilinear data record sample, single eye, single image .. 18 B.2 Rectilinear data record sample, multiple eyes, multiple images. 19 B.3 Polar image biometric data block, single eye, single image Bibliography 25 Copyright internatinal Oorganizatin for Siandaizain 2005All rights reserved ili Not for Resale ISO/IEC 19794-6:2005(E) Foreword Commission)formthespecializedsystemforworldwidestandardization.Nationalbodiesthataremembersof 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 andnon-governmental,inliaisonwithISOandEC,alsotakepartinthework.Inthefieldofinformation 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 vot