ISO INTERNATIONAL STANDARD 20498-1 First edition 2019-03 Traditional Chinese medicine Computerized tongue image analysis system - Part 1: General requirements Medecine traditionnelle chinoise - Systeme d'analyse d'images numerisees de la langue Partie 1: Exigences geénérales Reference number IS0 20498-1:2018(E) ISO @ IS0 2018 IS0 20498-1:2018(E) COPYRIGHTPROTECTEDDOCUMENT @ IS0 2018 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 or Iso's member body in the country of the requester. ISO copyright office CP 401 : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +4122 749 0111 Fax: +41 22 749 09 47 Email: copyright@iso.org Website: www.iso.org Published in Switzerland ii @ IS0 2018 - All rights reserved IS0 20498-1:2018(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. ..1 2 Normative references 3 Terms and definitions 4 Components of CTIS ..2 5 Technical requirements. 2 5.1 General. .2 5.2 Tongue positioning .2 5.3 Lightingpart .2 5.4 Image acquisition part .3 5.4.1 General. .3 5.4.2 Spatial resolution .3 5.4.3 Colour components .3 5.4.4 Colour components acquirement .4 5.5 Data processing part .4 5.6 Display. .4 6 Safety ..4 6.1 Safety of material. .4 6.2 Preventionfrom infection .4 6.3 General requirements for testing of ME equipment ..4 6.4 Electrical hazards .5 6.5 Mechanical hazards Annex A (informative) Tongue positioning ..6 Annex B (informative) Test methods for CTIS Annex C (informative) Data processing part .9 Bibliography .11 @ IS0 2018 - All rights reserved iii