ISO-23002-2-2008.pdf
《ISO-23002-2-2008.pdf》由会员分享,可在线阅读,更多相关《ISO-23002-2-2008.pdf(18页珍藏版)》请在三一文库上搜索。
1、 Reference number ISO/IEC 23002-2:2008(E) ISO/IEC 2008 INTERNATIONAL STANDARD ISO/IEC 23002-2 First edition 2008-06-01 Information technology MPEG video technologies Part 2: Fixed-point 8 8 inverse discrete cosine transform and discrete cosine transform Technologies de linformation Technologies vido
2、 MPEG Partie 2: Transformation de cosinus discret inverse 88 point fixe et transformation de cosinus discret Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Boeing Co/5910770001 Not for Resale, 07/25/2008 02:40:34 MDTNo reproduction or network
3、ing permitted without license from IHS -,-,- ISO/IEC 23002-2:2008(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 embedded are licensed to and install
4、ed on the computer performing the editing. In downloading this file, parties accept therein the responsibility of not infringing Adobes licensing policy. The ISO Central Secretariat accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software product
5、s used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is found, ple
6、ase inform the Central Secretariat at the address given below. COPYRIGHT PROTECTED DOCUMENT ISO/IEC 2008 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 microf
7、ilm, without permission in writing from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO/IEC
8、 2008 All rights reserved Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Boeing Co/5910770001 Not for Resale, 07/25/2008 02:40:34 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO/IEC 23002-2:2008(E) ISO/IEC 2008 A
9、ll rights reserved iii Contents Page Foreword iv Introduction v 1 Scope . 1 2 Terms and definitions. 1 3 Abbreviated terms 2 4 Conventions 2 4.1 Arithmetic operators. 2 4.2 Logical operators 3 4.3 Relational operators. 3 4.4 Bit-wise operators. 3 4.5 Assignment operators 3 4.6 Range notation 3 4.7 I
10、ndex notation for arrays 3 5 Specification of fixed point 8 8 IDCT . 4 5.1 General. 4 5.2 Scaling . 4 5.3 Computation of one-dimensional transforms 5 5.4 Right-shifting. 6 Annex A (informative) Fixed point 8 8 forward DCT 7 Annex B (normative) Reference software 9 Bibliography. 10 Copyright Internat
11、ional Organization for Standardization Provided by IHS under license with ISO Licensee=Boeing Co/5910770001 Not for Resale, 07/25/2008 02:40:34 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO/IEC 23002-2:2008(E) iv ISO/IEC 2008 All rights reserved Foreword ISO (the Inte
12、rnational Organization for Standardization) and IEC (the International Electrotechnical Commission) form the specialized system for worldwide standardization. National bodies that are members of ISO or IEC participate in the development of International Standards through technical committees establi
13、shed 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. In the f
14、ield of information technology, ISO 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 2. The main task of the joint technical committee is to prepare International Standards. Dra
15、ft 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 bodies casting a vote. Attention is drawn to the possibility that some of the elements of this
16、 document may be the subject of patent rights. ISO and IEC shall not be held responsible for identifying any or all such patent rights. ISO/IEC 23002-2 was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology, Subcommittee SC 29, Coding of audio, picture, multimedia and hyperm
17、edia information. ISO/IEC 23002 consists of the following parts, under the general title Information technology MPEG video technologies: Part 1: Accuracy requirements for implementation of integer-output 88 inverse discrete cosine transform Part 2: Fixed-point 88 inverse discrete cosine transform an
18、d discrete cosine transform Part 3: Representation of auxiliary video and supplemental information Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Boeing Co/5910770001 Not for Resale, 07/25/2008 02:40:34 MDTNo reproduction or networking permit
19、ted without license from IHS -,-,- ISO/IEC 23002-2:2008(E) ISO/IEC 2008 All rights reserved v Introduction A number of visual-coding-related specifications (see Ref. 1 to 6 in the Bibliography) include a requirement for decoders to implement an integer-output 88 inverse discrete cosine transform (ID
20、CT) for the generation of inverse-transformed samples with a nominal range from 0 to (2B)1, or sample differences with a nominal range from 2B to (2B)1, for some integer number of bits B, where B is greater than or equal to 8. This part of ISO/IEC 23002 provides the following benefits. It provides a
21、n example IDCT (and also an example forward DCT) approximation method to ease the implementation community in their design of decoders and encoders. It can help to ensure that decoders are implemented in full conformance with relevant video and image coding specifications (such as those listed in Re
22、fs. 2 to 6 in the Bibliography). Decoders that are designed to use the specified method will be assured to conform to the IDCT conformance requirements of the relevant image and video coding standards. It specifies a single deterministic result as the output of an image or video decoding process, su
23、ch that video analysis tools can operate on decoded video with precisely predictable results. This provides the assurance to source material providers, for example, of exactly what results will be obtained from a video target detector, segmentation mask operator, or other classification, analysis, o
24、r post-processing process that operates on the decoded video. Such certainty is not achievable without a deterministically-specified decoding result. It can improve the quality of delivered video and image representations, as encoders designed to target their encoding process for the IDCT approximat
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- ISO 23002 2008
链接地址:https://www.31doc.com/p-3776628.html