INTERNATIONAL ISO/IEC STANDARD 18477-2 Firstedition 2016-07-15 Information technology Scalable compression and coding of continuous-tone still images Part 2: Coding of high dynamic range images Technologies de I'information - Compression échelonnable et codage d'images plates en ton continu - Partie 2: Codage d'images a gamme dynamique élevée Reference number ISO/IEC 18477-2:2016(E) IEC International Organization for Standardization STANDARDIZATIONC15956617 @IS0/IEC 2016 ed without license from IHS IS0/IEC 18477-2:2016(E) COPYRIGHT PROTECTEDDOCUMENT IS0/IEC 2016, 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 [email protected] www.iso.org Internatinir DrganizationforStandardization Licensee-ZHEJIANG INST OF STANDRJSAIFC6 - All rights reserved Not for Resale, 2016/9/22 06:49:03 No reproduction or networking permited without license from IHS IS0/IEC 18477-2:2016(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. 2 Normative references 3 Terms and definitions 4 Abbreviated terms and symbols 4.1 Abbreviated terms .4 4.2 Symbols ..4 5 Conventions ..4 5.1 Conformance language .4 5.2 Operators. ..4 5.2.1 Arithmetic operators .5 5.2.2 Logical operators. ..5 5.2.3 Relational operators 5 5.2.4 Precedence order of operators. 5.2.5 Mathematical functions ..6 6 General .6 6.1 Elements specified ..6 6.2 High level overview of this document. .6 6.3 High level functional overview of decoding process .7 6.4 Encoder requirements .8 6.5 Decoder requirements. ..8 7 Decoder definition .8 7.1 Decoder functionality overview .8 7.2 Legacy Inverse Decorrelation Block B3 .9 7.3 Base Mapping and Colour space conversion Block B4 ..10 7.4 Residual decode Blocks B5, B6. ..11 7.5 Residual Mapping and Inverse Decorrelation Blocks B7, B8 ..12 7.6 HDR Reconstruction Blocks B9, B10 .13 8 Codestream syntax for Main Profile ..13 8.1 MainProfileHeaderStructure .13 8.2 Parameter AsCII segment. ..14 8.3 Parameter binary segment ..16 8.4 Residual codestream segment ..16 Annex A (normative) Checksum computation ..17 Bibliography ..18 iii See=ZHEJIANG INST OF STANDARDIZATION C1 5956617 vided by IHS under lic cense with ISO ed without license from IHS