IEC International ISO Standard 4 ISO/IEC 21794-6 Information technology First edition 2025-07 Plenoptic image coding s system (JPEG Pleno) 一 Part 6: Learning-based point cloud coding Technologies de I'information-Systeme de codage d'images plenoptiques(JPEGPleno) Partie 6:Codage de nuages de points base surl'apprentissage Referencenumber iSO/IEc21794-6:2025(en) ISO/IEC2025 ISO/IEC 21794-6:2025(en) COPYRIGHT PROTECTED DOCUMENT ISO/IEC2025 All rights res erved.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 oftherequester: ISO copyrightoffice CP401-Ch.de Blandonnet 8 CH-1214 Vernier,Geneva Phone:+41227490111 Email:[email protected] Website:www.iso.org Published in Switzerland @ISO/IEC 2025-All rights reserved ii 21794-6:2025(en) ISO/IEC Contents Page Foreword Introduction 1 Scope. 2 Normative references 3 Terms and definition 4 Symbols and abbreviated terms 4.1 Symbols 4.2 Abbreviated terms .. 5 Conventions 5.1 Naming conventions for numerical values 5.2 Operators 5.2.1 Arithmeticoperators 5.2.2 Logical operators 5.2.3 Relational operators 5.2.4 Set operators 5.2.5 Precedence order ofoperators 5.2.6 Mathematical functions General .... 6.1 Point cloud geometry representations 6.2 Multiple learnable neural networkmodels 10 6.3 Functional description of the encoding proces 10 6.4 of the decoding Functional description proces 6.5 Encoder requirements 6.6 Decoder requirements 2 6.7 Trained models and parameters 7 Organization of the documen. Annex A (normative) File format . 14 AnnexB(normative）Geometrycodestream syntax .20 Annex C(normative)Deep learning -based decoding 27 Annex D (normative) Colour decoding .. .30 Annex E(normative)Synthesis transform Annex F(normative)Hyper decoders ..38 AnnexG(normative)Entropydecodin 42 Annex H (normative ) Binarization .. ..45 Annexl [normative ]Block merging AnnexJ (normative ) Up-sampling ... 49 Annex K(normative) Deep learning -based super -resolution 50 Bibliography 54 @ISO/IEC 2025-All rightsreserved ili 21794-6:2025(en) ISO/IEC Foreword ISO(the International Organization for Standardization)and IEC （the International Electrotechnical Commission)form the specialized system for worldwide standardization.National bodies that are members of ISO or EC participate in the development of International Standards through technical committees established by the respective organization to deal with particular fields of technical activity. ISO and IEC technical committees collaborate in fields of mutual interest.Other international organizations, governmental and non-governmental,in liaison with ISO and IEC,also take part in the work. The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives,Part 1.In particular,the different approval criteria needed for the different types of document should be noted.This document was drafted in accordance with the editorial rules of the IsO/ IEC Directives,Part 2 (see www.iso.org/directives or www.iec.ch/members experts/refdocs). ISO and IEC draw attention to the possibility that the implementation of this document may involve the use of (a)patent(s).ISO and IEC take no position concerning the evidence,validity or applicability of any claimed patent rights in respect thereof.As of the date of publication of this document,ISO and IEC had not received notice of (a)patent(s)which may be required to implement this document.However,implementers are cautioned that this may not represent the latest information,which may be obtained from the patent database available at www.iso.org /patents and https://patents.iec.ch .ISO and IEC shall not be held responsible