ISO INTERNATIONAL STANDARD 20462-3 Second edition 2012-05-15 Photography Psychophysical experimental methods for estimating image quality - Part 3: Quality ruler method Photographie Methodes psychophysiques experimentales pour estimer la qualite d'image - Partie 3: Méthode de la regle de qualité Reference number ISO 20462-3:2012(E) ISO @ISO2012 S unde No reproo Not for Resale ISO20462-3:2012(E) COPYRiGHTPROTECTEDDOCUMENT ISO2012 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-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyright@iso.org Web www.iso.org Published in Switzerland @ ISO 2012 - All rights reserved Not for Resale ISO20462-3:2012(E) Contents Page Foreword .iv Introduction 1 Scope 2 Normative references 3 Termsanddefinitions 4 Quality ruler experiments.. 4.1 General properties of quality rulers .. 4.2 Experimental conditions and reported results. 4.3 Attributes varied in quality rulers ... 5 Hardcopy quality ruler implementation. 5.1 Physical apparatus 5.2 Reference stimuli.. 6 Softcopy quality ruler implementation 6.1 Physical apparatus 8 6.2 Reference stimuli.. 8 6.3 Controlling software 8 7 Generation of quality ruler stimuli. 9 7.1 General requirements. 9 7.2 Modulation transfer functions (MTFs) 10 7.3 Scene-dependent ruler calibration . 11 8 Standardqualityscale(SQS)determinations 12 8.1 Properties of the SQS. 12 8.2 Experimental requirements for measuring primary SQSt 12 8.3 Experimental requirements for measuring secondary SQS2 12 Annex A (informative) Sample instructions for a hardcopy quality ruler experiment 13 Annex B (informative) Sample instructions for softcopy ruler experiments using binary sort paired comparison 15 Annex C (informative) Sample code of a binary search routine for the softcopy quality ruler... .17 Annex D (informative) Calibration of the standard quality scale (SQS) and its reference stimuli... Annex E (informative) Example of results from quality ruler experiments.. 21 Annex F (informative) Sample instructions for a softcopy ruler experiment using slider bar matching 25 Bibliography... ili lout license from IHS Not for Resale