TECHNICAL ISO/IEC TR REPORT 23008-15 First edition 2018-08 Information technology High efficiency coding and media delivery in heterogeneous environments Part 15: Signalling, backward compatibility and display adaptation for HDR/WCG video Technologies de I'information - Codage a haut rendement et fourniture de supports dans les environnements heterogenes Partie 15: Signalisation, compatibilité amont et adaptation de I'affichage pour la vidéo HDR/WCG Reference number IS0/IEC TR 23008-15:2018(E) IEC ISO @IS0/IEC 2018 IS0/IEC TR23008-15:2018(E) COPYRIGHTPROTECTEDDOCUMENT @IS0/IEC2018 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 beloworIso'smemberbodyinthecountryoftherequester. ISO copyright office CP 40i : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone:+41227490111 Fax: +4122 749 09 47 Email: [email protected] Website: www.iso.org Published in Switzerland ii IS0/IEC2018-Allrightsreserved IS0/IECTR 23008-15:2018(E) Contents Page Foreword V Introduction vi 1 Scope 1 2 Normative references. 1 3 Terms and definitions .1 4 Abbreviated terms. .3 5 Conventions 4 5.1 General. 4 5.2 Arithmetic operators 5 5.3 Bit-wise operators. 5 5.4 Assignment operators. 6 5.5 Relational, logical and other operators. 6 5.6 Mathematical function.. 6 5.7 Order of operations. 7 Overview .8 6 7 HEVC signalling mechanisms applicable to HDR/WCG video 7.1 General. 9 7.2 vUI syntax elements 9 7.3 SEI messages applicable for HDR/WCG video 10 7.3.1 10 General. 7.3.2 Mastering display colour volume SEI message 10 7.3.3 Content light ievel information SEI message 11 7.3.4 Ambient viewing environment SEI message 11 7.3.5 Alternative transfer characteristics SEI message 11 7.3.6 Tone mapping information SEI message.. 11 .12 7.3.7 Colour remapping information SEI message. 7.4 Overview of PQ and HLG transfer functions. 13 General. 7.4.1 13 7.4.2 Reference PQ EOTF 14 7.4.3 Reference HLG OETF 15 7.5 ICrCp colour representation. 16 7.5.1 General. 16 .17 7.5.2 Pre-encoding process 7.5.3 Encoding process. 20 7.5.4 Decoding process .22 7.5.5 Post-decoding process 22 Bitstream SDR backward compatibility with single-layer coding .24 8 8.1 General. .24 .24 8.2 Approach 1: usage of HLG for "static" bitstream SDR backward compatibility .24 8.2.1 General. 25 8.2.2 HLG pre-encoding conversion process 8.2.3 Encoding process.. 27 8.2.4 Decoding process. .29 8.2.5 HLG post-decoding conversion. 29 Colour representation conversion: Y'CbCr to R'G'B' 30 8.2.6 8.3 Approach 2: usage of SEI messages for "dynamic" bitstream SDR backward .30 compatibility 8.3.1 .30 General. 8.3.2 CRI applied in Y'CbCr 4:2:0 domain. 31 .32 8.3.3 CRI applied in Y'CbCr 4:4:4 domain 8.3.4 TMI applied in R'G'B' 4:4:4 domain 33 iii @IS0/IEC2018-Allrightsreserved