INTERNATIONAL ISO/IEC STANDARD 29794-6 First edition 2015-07-01 Information technology Biometric sample quality - Part 6: Iris image data Technologies de l'information - Qualite d'échantillon biométrique- Partie 6: Image d'iris Reference number ISO/IEC29794-6:2015(E) tional Organization for Standardization rdization 5956617 @IS0/IEC2015 rovided by IHS under lic IS0/IEC29794-6:2015(E) COPYRIGHTPROTECTEDDOCUMENT @ IS0/IEC 2015, Published in Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form 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 Ch. de Blandonnet 8 . CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 copyright@iso.org www.iso.org ganization for Standardization rovided by IHS under lice Not for Resale, 2015/9/22 08:30:38 IS0/IEC29794-6:2015(E) Contents Page Foreword .. Introduction. ..i. 1 Scope.. 2 Conformance 3 Normative references .2 4 Terms and definitions .2 5 Acronymsandabbreviatedterms. ..3 6 Iris image quality metrics. ..3 6.1 General .3 6.2 Required iris image quality metrics computed from a single image 6.2.1 Usable iris area. 4 6.2.2 Iris-sclera contrast. .5 6.2.3 Iris-pupil contrast 6 6.2.4 Pupil boundary circularity 7 6.2.5 Grey scale utilisation. .8 6.2.6 Iris radius.... .8 6.2.7 Pupil dilation 9 6.2.8 Iris pupil concentricity .9 6.2.9 Margin adequacy. .10 6.2.10 Sharpness.. ..12 6.3 Recommended iris image quality metrics computed from a single image .13 6.3.1 Frontal gaze-elevation .13 6.3.2 Frontal gaze-azimuth .13 6.3.3 Motion blur .15 6.4 Iris image qualitymetrics computed from two images ..15 6.4.1 Common usable iris area .15 6.4.2 Dilation constancy. 6.4.3 Illumination similarity .16 6.5 Unified (overall) quality score ..16 6.5.1 General ..16 6.5.2 Computational method ..16 7 Iris acquisition quality .17 7.1 General. .17 7.2 Dedicated illumination ..17 7.2.1 Description. .17 7.2.2 Units of measure .17 7.2.3 Computational method ..18 7.2.4 Value range/threshold .18 7.3 Modulationtransferfunction ..18 7.3.1 Description. .18 7.3.2 Units of measure ..18. 7.3.3 Computational method .18 7.3.4 Value range/threshold 7.4 Spatial sampling rate ..18 7.4.1 Description. ..18 7.4.2 Units of measure ..19 7.4.3 Computational method .19 7.4.4 Value range/threshold 7.5 Optical distortion .19 7.6 Pixel aspect ratio ..19 7.6.1 Description. .19 7.6.2 Units of measure .19 ili re=Zhejian rdization 5956617 Provided by IHS under license with ISO