ISO/IEC INTERNATIONAL STANDARD 9281-1 First edition 1990-08-01 Information technology -- Picture coding methods Part 1: Identification Technologies de I'information -- Methodes de codage d'image - Partie 1: Identification Referencenumber ISO/1EC9281-1:1990(E) Copyright Intermational Organization for Standardization 'rovided by IHS censewithIs g permitted without license from IHS Not for Resale ISO/IEC 9281-1:1990(E) Foreword Iso (the International Organization for Standardization) andJEC (the International Electrotechnical Commission) form the specialized system orIECparticipate inthe developmentof International Standardsthrough technical committees established by the respective organization to deal with particular fields of technical activity.Iso and IEc technical com- mittees collaborate in fields of mutual interest. Other international or- ganizations, governmental and non-governmentai, in liaison with iso and IEC, also take part in the work. In the field of information technology. Iso and IEc have established a joint technical committee, ISO/IEc JTc 1. Draft International Standards adopted by the joint technical committee are circulated to national bod- ies for voting. Publication as an International Standard requires ap- proval by at least 75 % of the national bodies casting a vote. International Standard ISO/IEC 9281-1 was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology. ISO/lEC 9281 consists of the following parts, under the general title In- formation technology -- Picture coding methods: Part 1: Identification Part 2:Procedure forregistration Annexes A and B of this part of ISO/IEC 9281 are for information only. ISO/IEC1990 All rights reserved. No part of this publication may be reproduced or utilized in any form permissioninwriting fromthepublisher. ISO/IEC Copyright Office·Case Postale 56·CH-1211 Geneve 20·Switzerland Printed in Switzerland CoyrghematinalOrgnizatiofoSandardizai without license from IHS Not for Resale 1SO/IEC 9281-1:1990(E) Introduction This part of isO/lEc 9281 specifies the identification methods for coding of pictorial information in digital form where the information can be change of physical storage media. Techniques are provided to switch between picture coding methods in the picture coding environment, as well as to switch between the picture coding environment and coding systems according to ISO 2022. Thus, this part of ISO/IEC 9281 is limited to coding and does not address functional aspects which are covered by other International Standards, e.g. Iso 8613. Iso 2022 deals with byte-oriented coding and extension techniques for graphic characters and control functions, and assigns specific areas of the code table to graphic characters and to control functions. In picture coding this structure cannot be retained. Picture coding methods con- stitute, therefore, coding systems different from that of iso 2022. Indeed, the control functions may take the form of operations (opcodes) and operands. Because this part of IsO/lEc 9281 is intended to serve as a basis for a number of other standards for specific picture coding I methods, an in- troduction to its basic concepts is included in annex B. Copyright intemational Ooganizatin for Standardization ili d without license from IHS Not for Resale