ISO INTERNATIONAL STANDARD 20498-2 First edition 2017-05 Traditional Chinese medicine Computerized tongue image analysis system - Part 2: Light environment Médecine traditionnelle chinoise - Systeme d'analyse d'images numérisées de la langue - Partie 2: Environnement lumineux Reference number IS0 20498-2:2017(E) International Organization for Standardization @ IS0 2017 mitted without license from IHS IS0 20498-2:2017(E) COPYRIGHTPROTECTEDDOCUMENT IS0 2017, Published in Switzerland All rights reserved. Unless otherwise specified, 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 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 [email protected] www.iso.org Licensee-ZHEJIANG INST OF STANDARDIZAISQ 017 - All rights reserVed Not for Resale, 2017/8/21 01:08:30 networking permited without license from IHS IS0 20498-2:2017(E) Contents Page Foreword ..iv 1 Scope .1 2 Normative references 3 Terms and definitions 4 Technical requirements. 4.1 Illuminance. .1 4.2 Colour temperature 4.3 Colour rendering index. 2 4.4 Illuminationdistribution .2 4.5 Irradiance 2 4.6 Ultraviolet irradiance 2 5 Test methods. .2 5.1 Measuring points on effective surface area 2 5.2 Illuminance .3 5.3 Colour temperature 3 5.4 Colour rendering index. 3 5.5 Illumination distribution 3 5.6 Irradiance .3 5.7 Ultraviolet irradiance Annex A (informative) Spectral weighting function for assessing ultraviolet hazards Bibliography 6 iii icenSee=ZHEJIANG INST OF STANDARDIZATION C1 5956617 vided by IHS under I Not for Resale, 2017/8/21 01:08:30 d without license from IHS