ISO/TR TECHNICAL REPORT 20498-5 First edition 2019-01 Traditional Chinese medicine Computerized tongue image analysis system - Part 5: Method of acquisition and expression of tongue colour and tongue coating colour Medecine traditionnelle chinoise-Systeme d'analyse d'images numériséesdela langue- Partie 5: Methode d'acquistion et expression de la couleur de la langue et du revetement de la langue Reference number ISO/TR20498-5:2019(E) ISO @IS0 2019 IS0/TR 20498-5:2019(E) COPYRIGHTPROTECTEDDOCUMENT @ISO2019 All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either IsO at the address below orIso's memberbody in the countryof therequester. ISO copyright office CP 401 : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone:+41227490111 Fax:+41 22 749 09 47 Email: [email protected] Website: www.iso.org Published in Switzerland ii @ IS0 2019 - All rights reserved IS0/TR20498-5:2019(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. .1 2 Normative references ..1 3 Terms anddefinitions .1 4 Colourcalibrationoftheacquisitiondevice .2 4.1 Choiceof colourspace .2 4.2 Calibration oftheacquisition device .2 4.2.1General.. .2 4.2.2 Whiteboardcalibration .2 4.2.3 Colour calibration .3 5 Methods ofdigital representation of tongue colour and coating colour .4 5.1 Clustering method. .4 5.2 Histogram method 4 5.3 Meanvaluemethod .5 Annex A (informative) Validityof tongue image acquisition and analysis Annex B (informative) Example for representation of tongue colour and coating colour ..10 Bibliography .16 @IS0 2019-All rights reserved iii