ITU-T T 88 AMD 1-2003 Information technology C Lossy lossless coding of bi-level images Amendment 1 Encoder (Study Group 16)《信息技术 二级图像的有损 无损编码 增补第1次 发布 2004 12 16》.pdf
《ITU-T T 88 AMD 1-2003 Information technology C Lossy lossless coding of bi-level images Amendment 1 Encoder (Study Group 16)《信息技术 二级图像的有损 无损编码 增补第1次 发布 2004 12 16》.pdf》由会员分享,可在线阅读,更多相关《ITU-T T 88 AMD 1-2003 Information technology C Lossy lossless coding of bi-level images Amendment 1 Encoder (Study Group 16)《信息技术 二级图像的有损 无损编码 增补第1次 发布 2004 12 16》.pdf(16页珍藏版)》请在麦多课文档分享上搜索。
1、 INTERNATIONAL TELECOMMUNICATION UNION ITU-T T.88TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Amendment 1(06/2003) SERIES T: TERMINALS FOR TELEMATIC SERVICES Information technology Lossy/lossless coding of bi-level images Amendment 1: Encoder ITU-T Recommendation T.88 (2000) Amendment 1 ITU-T Rec
2、. T.88 (2000)/Amd.1 (06/2003) i INTERNATIONAL STANDARD ISO/IEC 14492 ITU-T RECOMMENDATION T.88 Information technology Lossy/lossless coding of bi-level images Amendment 1 Encoder Summary The objective of this amendment is to extend the ITU-T Rec. T.88 | ISO/IEC 14492 (JBIG2) standard for compression
3、 of bi-level images, currently specified in terms of compliant data streams and decoding, to also cover compliant encoding. In particular, this amendment: 1) specifies a compliant architecture for JBIG2 encoding; and 2) illustrates example encoding methods for each optional architecture component. S
4、pecification of the compliant architecture facilitates applications needing the benefits of a combined encoding/decoding standard, while still permitting competition in the encoding method chosen for any component. The compliant encoding method(s) chosen as examples for each architectural component
5、were selected to target expired (or expiring) patents, openly published methods or royalty-free patents. Selection of a representative method for each optional component should result in reasonable encoder performance in both compression and quality. Using the full combination of components, togethe
6、r with their example encoding methods, provides new users with a default encoder design and a benchmark for JBIG2 encoding that illustrates reasonable near-lossless quality for documents with 300 dpi, or higher, resolution. Source Amendment 1 to ITU-T Recommendation T.88 (2000) was approved on 29 Ju
7、ne 2003 by ITU-T Study Group 16 (2001-2004) under the ITU-T Recommendation A.8 procedure. An identical text is also published as ISO/IEC 14492, Amendment 1. This amendment includes the modifications introduced by erratum 1 on 16 December 2004. ii ITU-T Rec. T.88 (2000)/Amd.1 (06/2003) FOREWORD The I
8、nternational Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical, operating and tariff questions and issuing Recomm
9、endations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Assembly (WTSA), which meets every four years, establishes the topics for study by the ITU-T study groups which, in turn, produce Recommendations on these topics. The a
10、pproval of ITU-T Recommendations is covered by the procedure laid down in WTSA Resolution 1. In some areas of information technology which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with ISO and IEC. NOTE In this Recommendation, the expression “Administ
11、ration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. Compliance with this Recommendation is voluntary. However, the Recommendation may contain certain mandatory provisions (to ensure e.g. interoperability or applicability) and complia
12、nce with the Recommendation is achieved when all of these mandatory provisions are met. The words “shall“ or some other obligatory language such as “must“ and the negative equivalents are used to express requirements. The use of such words does not suggest that compliance with the Recommendation is
13、required of any party. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. ITU takes no position concerning the evidence, validity or applicability of claimed Inte
14、llectual Property Rights, whether asserted by ITU members or others outside of the Recommendation development process. As of the date of approval of this Recommendation, ITU had received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. Ho
15、wever, implementors are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database. ITU 2005 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU.
16、 ITU-T Rec. T.88 (2000)/Amd.1 (06/2003) iii CONTENTS Page 1) New clauses 9, 10, and 11 1 2) New Annex J 5 iv ITU-T Rec. T.88 (2000)/Amd.1 (06/2003) Introduction In this amendment, the following new materials are added: a) new clauses 9, 10, and 11 to describe the required architecture and procedures
17、 for JBIG2 encoding; and b) a new Annex J to document optional JBIG2 encoding methods. The encoding procedures in clauses 9 and 10 are essentially the inverse of the decoding procedures already described in clauses 6 and 7 of ITU-T Rec. T.88 | ISO/IEC 14492. To simplify the required new documentatio
18、n, description of each of the encoding procedures is given by referring to the corresponding decoding procedures in clauses 6 and 7, wherever applicable. Clause 11 and Annex J, however, are new material and thus contain more detailed documentation. In clause 11 (although the encoding complements tha
19、t of clause 8 of ITU-T Rec. T.88 | ISO/IEC 14492), JBIG2 encoding architecture as well as its technical components are described, and their corresponding implementation methods are given by reference. In J.1, compliant example encoding methods are summarized in table form. ISO/IEC 14492:2001/Amd.1:2
20、004 (E) ITU-T Rec. T.88 (2000)/Amd.1 (06/2003) 1 INTERNATIONAL STANDARD ITU-T RECOMMENDATION Information technology Lossy/lossless coding of bi-level images Amendment 1 Encoder 1) New clauses 9, 10, and 11 Add the following clauses: 9 Encoding procedures The encoding procedures in this clause are es
21、sentially the inverse of the decoding procedures already described in clause 6 and will not be duplicated here. The inverse of generic region encoding is described in 6.2. The inverse of generic refinement encoding is described in 6.3. The inverse of text region encoding is described in 6.4. The inv
22、erse of symbol dictionary encoding is described in 6.5. The inverse of halftone region encoding is described in 6.6. The inverse of pattern dictionary encoding is described in 6.7. 10 Control encoding procedures The control encoding procedures in this clause are essentially the inverse of the decodi
23、ng control procedures already described in clause 7 and will not be duplicated here. The inverse of segment header syntax encoding is described in 7.2. The inverse of segment type encoding is described in 7.3. The segment types syntax for the region segment information field, symbol dictionary segme
24、nt, text region segment, pattern dictionary segment, halftone region segment, generic region, generic refinement segment, end of page segment, end of stripe segment, end of file segment, profiles segment, code table segment and extension segment are described in detail in 7.4.1 to 7.4.15 respectivel
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