ISO/IEC INTERNATIONAL STANDARD 21122-2 Second edition 2022-03 Information technology JPEG XS low-latency lightweight image coding system Part 2: Profiles and buffer models Technologies de I'information - Systeme de codage d'images leger a faiblelatenceJPEGXS- Partie 2: Profils et modeles tampons Reference number IEC IS0/IEC 21122-2:2022(E) OSI @ IS0/IEC 2022 IS0/IEC 21122-2:2022(E) COPYRIGHT PROTECTED DOCUMENT @IS0/IEC2022 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 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: +41 22 749 01 11 Email: [email protected] Website: www.iso.org Published in Switzerland i @ IS0/IEC 2022 - All rights reserved IS0/IEC 21122-2:2022(E) Contents Page Foreword. ..iv Introduction. .V 1 Scope. .1 2 Normative references ..1 3 Terms, definitions, symbols and abbreviated terms 3.1 Terms and definitions .1 3.2 Abbreviated terms... 3.3 Symbols. .4 4 Conventions .6 4.1 Conformance language .6 4.2 Operators. 6 4.2.1 Arithmetic operators. .6 4.2.2 Logical operators. ..6 4.2.3 Relational operators. ..6 4.2.4 Precedence order of operators .6 4.2.5 Mathematical functions .7 5 Buffer model .7 5.1 General system block diagram 7 5.2 Influencing variables on the required buffer sizes .8 5.3 Role of the buffer model. ..9 6 Interpretation of Bayer data .9 Annex A (normative) Profiles, levels and sublevels ..11 Annex B (normative) Packet-based JPEG XS decoder model .25 Annex C (normative) Packet-based constant bit rate buffer model .31 Annex D (informative) Encoder model, latency bounds and codestream conformance properties for the packet-based constant bit rate buffer model .37 Annex E (informative) JPEG XS latency analysis .42 Bibliography. ..49 IS0/IEC 2022 - All rights reserved i