ANSI INCITS ISO IEC 14496-2 AMD 1-2002 Information technology - Coding of audio-visual objects - Part 2 Visual AMENDMENT 1 Studio profile (Adopted by INCITS).pdf
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1、INTERNATIONAL STANDARD ISO/IEC 14496-2 Second edition 2001-12-01 AMENDMENT 1 2002-02-01 Information technology - Coding of audio-visual objects - Part 2: Visual AMENDMENT 1 : Studio profile Technologies de linformation - Codage des objets audiovisuels - Partie 2: Codage visuel AMENDEMENT 1: Profil d
2、u studio Adopted by INCITS (InterNational Committee for Information Technology Standards) as an American National Standard. Date of ANSI Approval: 1/2/2003 Published by American National Standards Institute, 25 West 43rd Street, New York, New York 10036 Copyright 2002 by Information Technology Indus
3、try Council (ITI). All rights reserved. These materials are subject to copyright claims of International Standardization Organization (ISO), International Electrotechnical Commission (IEC), American National Standards Institute (ANSI), and Information Technology Industry Council (ITI). Not for resal
4、e. No part of this publication may be reproduced in any form, including an electronic retrieval system, without the prior written permission of ITI. All requests pertaining to this standard should be submitted to ITI, 1250 Eye Street NW, Washington, DC 20005. Printed in the United States of America
5、Reference number ISOIIEC 14496-2:2001 /Amd.l:2002(E) 0 ISOIIEC 2002 ISO/IEC 196-2:2001/Amd.l:2002( E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are emb
6、edded are licensed to and installed on the computer performing the editing. In downloading this file, parties accept therein the responsibility of not infringing Adobes licensing policy. The IS0 Central Secretariat accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated
7、. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDFcreation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by IS0 member bodies. In the unlikely event that a prob
8、lem relating to it is found, please inform the Central Secretariat at the address given below. O ISO/IEC 2002 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and m
9、icrofilm, without permission in writing from either IS0 at the address below or ISOs member body in the country of the requester. IS0 copyright office Case postale 56 CH-1 21 1 Geneva 20 Tel. + 41 22 749 O1 11 Fax +41 227490947 E-mail copyrightiso.ch Web www.iso.ch Printed in Switzerland ii O ISO/IE
10、C 2002 -All rights reserved ISO/I EC 14496-2 :2001 /hd. 1 : 2002( E) Foreword IS0 (the International Organization for Standardization) and IEC (the International Electrotechnical Commission) form the specialized system for worldwide standardization. National bodies that are members of IS0 or IEC par
11、ticipate in the development of International Standards through technical committees established by the respective organization to deal with particular fields of technical activity. IS0 and IEC technical committees collaborate in fields of mutual interest. Other international organizations, governmen
12、tal and non-governmental, in liaison with IS0 and IEC, also take part in the work. In the field of information technology, IS0 and IEC have established a joint technical committee, ISO/IEC JTC 1. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3
13、. The main task of the joint technical committee is to prepare International Standards. Draft International Standards adopted by the joint technical committee are circulated to national bodies for voting. Publication as an International Standard requires approval by at least 75 % of the national bod
14、ies casting a vote. Attention is drawn to the possibility that some of the elements of this Amendment may be the subject of patent rights. IS0 and IEC shall not be held responsible for identifying any or all such patent rights. Amendment 1 to International Standard ISO/IEC 14496-2:2001 was prepared
15、by Joint Technical Committee ISO/IEC JTC 1, Information technology, Subcommittee SC 29, Coding of audio, picture, multimedia and hypermedia informa tion. O ISOIIEC 2002 -All rights reserved iii ISO/I EC 14496-2 :2001 /hd. 1 : 2002( E) Information technology - Coding of audio-visual objects - Part 2:
16、 Visual AMENDMENT I : Studio profile 1) Add the following text at the end of Overview of the object based non scalable syntax of Introduction: II In order to preserve the lossless quality, or to restrict the maximum bit count of block data, the block based DPCM coding can be used for ISO/IEC 14496-2
17、:2001 Amendment 1 (Studio Profile Amendment). 2) Replace text in Coding of Shapes of Introduction, II In natural video scenes, VOPs are generated by segmentation of the scene according to some semantic meaning. For such scenes, the shape information is thus binary (binary shape). Shape information i
18、s also referred to as alpha plane. The binary alpha plane is coded on a macroblock basis by a coder which uses the context information, II with II motion compensation andarithmetic coding. es, VOPs are generated by segmentation of the SCE In natural video SCE e according to some semantic meaning. Fo
19、r such scenes, the shape information is thuk binary (binary shape). Shape information is also referred to as alpha plane. The binary alpha plane is coded on a macroblock basis by a coder which uses the context information, motion compensation and arithmetic coding. For high quality applications, the
20、 uncompressed binary alpha block coding is used. 3) Add the following text in Introduction following Coding of Shapes: II Coding interlaced video Each frame of interlaced video consists of two fields which are separated by one field-period. This part of ISO/IEC 14496 allows either the frame to be en
21、coded as a VOP or the two fields to be encoded as two VOPs. Frame encoding or field encoding can be adaptively selected on a frame-by-frame basis. Frame encoding is typically preferred when the video scene contains significant detail with limited motion. Field encoding, in which the second field can
22、 be predicted from the first, works better when there is fast movement. O ISOIIEC 2002 -All rights reserved 1 ISO/IEC 196-2:2001/Amd.l:2002( E) 4) Replace text in Motion representation - macroblocks of Introduction, The choice of 16x16 blocks (referred to as macroblocks) for the motion-compensation
23、unit is a result of the trade- off between the coding gain provided by using motion information and the overhead needed to represent it. Each macroblock can further be subdivided to 8x8 blocks for motion estimation and compensation depending on the overhead that can be afforded. In order to encode t
24、he highly active scene with higher vop rate, a Reduced Resolution VOP tool is provided. When this tool is used , the size of the macroblock used for motion compensation decoding is 32 x 32 pixels and the size of block is 16 x 16 pixels. with II The choice of 16x16 blocks (referred to as macroblocks)
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