IEC International ISO Standard ISO/IEC18477-1 Third edition Information technology-Scalable compression and coding of 2024-05 continuous-tone still images Part 1: Core coding system specification Technologies de l'information -Compression échelonnableet codaged'imagesplates entoncontinu- Partie I:Specification du systeme de codage de noyau OISO/IEC2024 ISO/IEC 18477-1:2024(en) COPYRIGHT PROTECTED DOCUMENT OISO/IEC2024 All rights reserved.Unless otherwise specified,or required in the context of ts 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:+41227490111 Email:copyright@iso.org Website:www.iso.org Published in Switzerland @ISO/IEC2024-Allrightsreserved ii ISO/IEC 18477-1:2024(en) Contents Page @ Foreword Introduction 1 Scope 2 Normativereferences 3 Termsand definitions 4 Symbolsand abbreviatedterms 4.1 Symbols. 4.2 Abbreviated terms 5 Conventions Conformancelanguage 5.2 5.2.1 Arithmetic operators. 5.2.2 Assignment operators 5.2.3 Precedenceorder of operators 5.2.4Mathematicalfunctions . 6 General. 6.1 Generaldefinitions 6.2 Functionaloverviewonthedecodingprocess... 6.3 Encoder requirements... 6.4 Decoder requirements ... AnnexA(normative) Componentsubsamplingand expansionof subsampling AnnexB(normative)Codestreamsyntax AnnexC(normative)Multi-componentdecorrelation. 15 Bibliography 17 O IS0/ IEC 2024-All rights reserved ii