ANSI INCITS ISO IEC 14496-2 AMD 2-2002 Information technology - Coding of audio-visual objects - Part 2 Visual AMENDMENT 2 Streaming video profile (Adopted by INCITS).pdf
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1、INTERNATIONAL STANDARD ISO/IEC 14496-2 Second edition 2001-12-01 AMENDMENT 2 2002-02-01 Information technology - Coding of audio-visual objects - Part 2: Visual AMENDMENT 2: Streaming video profile Technologies de linformation - Codage des objets audiovisuels - Partie 2: Codage visuel AMENDEMENT 2:
2、Cours du profil vido Adopted by INCITS (InterNational Committee for Information Technology Standards) as an American National Standard. Date of ANSI Approval: 8/29/02 Published by American National Standards Institute, 25 West 43rd Street, New York, New York 10036 Copyright 2002 by Information Techn
3、ology Industry 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). No
4、t for resale. 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
5、of America Reference number ISOIIEC 14496-2:2001 /Amd.2:2002(E) O ISOIIEC 2002 ISO/I EC 196-2:2001/Amd.2:2002(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 wh
6、ich are embedded 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 I
7、ncorporated. 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
8、that a problem relating to it is found, please inform the Central Secretariat at the address given below. O ISO/IEC 2002 All rights reserved. Unless othetwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photoco
9、pying and microfilm, 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
10、ii O ISO/IEC 2002 -All rights reserved ISO/IEC 196-2:2001/Amd.2:2002( 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
11、 participate 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, gover
12、nmental 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, Pa
13、rt 3. 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
14、 bodies 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 2 to International Standard ISO/IEC 14496-2:2001 was prepa
15、red by Joint Technical Committee ISO/IEC JTC 1, Information technology, Subcommittee SC 29, Coding of audio, picture, multimedia and hypermedia information. O ISOIIEC 2002 -All rights reserved iii ISO/IEC 14496-2:2001/Amd.2:2002(E) Information technology - Coding of audio-visual objects - Part 2: Vi
16、sual AMENDMENT 2: Streaming video profile 1) Add the following text to the end of Purpose of Introduction: I Two profiles are developed in response to the growing need for a video coding method for Streaming Video on Internet applications. It provides the definition and description of Advanced Simpl
17、e (AS) Profile and Fine Granularity Scalable (FGS) Profile. AS Profile provides the capability to distribute single-layer frame based video at a wide range of bit rates available for the distribution of video on Internet. FGS Profile uses AS Video Object in the base layer and provides the descriptio
18、n of two enhancement layer types - Fine Granularity Scalability (FGS) and FGS Temporal Scalability (FGST). FGS Profile allows the coverage of a wide range of bit rates for the distribution of video on Internet with the flexibility of using multiple layers, where there is a wide range of bandwidth va
19、riation. I 2) Add the following text into Introduction following Error Resilience: I Fine Granularity Scalability Fine Granularity Scalability (FGS) provides quality scalability for each VOP. Figure AMD2-1 shows a basic FGS decoder structure. FGS Enhancement Decoding (optional output) Figure AMD2-1
20、- A Basic FGS Decoder Structure To reconstruct the enhanced VOP, the enhancement bitstream is first decoded using bit-plane VLD. The decoded block-bps are used to reconstruct the DCT coefficients in the DCT domain which are then right-shifted based on the frequency weighting and selective enhancemen
21、t shifting factors. The output of bit-plane shift is the DCT coefficients of the image domain residues. After the IDCT, the image domain residues are reconstructed. They are added to the reconstructed clipped base-layer pixels to reconstruct the enhanced VOP. The reconstructed enhanced VOP pixels O
22、ISOIIEC 2002 -All rights reserved 1 ISO/I EC 196-2:2001/Amd.2:2002(E) FGS VOP are limited into the value range between O and 255 by the clipping unit in the enhancement layer to generate the final enhanced video. The reconstructed base layer video is available as an optional output since each base l
23、ayer reconstructed VOP needs to be stored in the frame buffer for motion compensation. j The basic FGS enhancement layer consists of FGS VOPs that enhance the quality of the base-layer VOPs as shown in Figure AMD2-2. Base VOP FGS Layer VOP VOP VOP VOP VOP VOP i I I I I I I FGS VOP I“ FGST FGS FGST F
24、GS FGST FGS VOP VOP VOP VOP VOP VOP / Base Layer / / Figure AMD2-2 - Basic FGS Enhancement Structure When FGS temporal scalability (FGST) is used, there are two possible enhancement structures. One structure is to have two separate enhancement layers for FGS and FGST as shown in Figure AMD2-3 and th
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