ITU-T T 43-1997 Colour and Gray-Scale Image Representations Using Lossless Coding Scheme for Facsimile - Series T Terminals for Telematic Services (Study Group 8 17 pp)《传真中使用无损编码方案.pdf
《ITU-T T 43-1997 Colour and Gray-Scale Image Representations Using Lossless Coding Scheme for Facsimile - Series T Terminals for Telematic Services (Study Group 8 17 pp)《传真中使用无损编码方案.pdf》由会员分享,可在线阅读,更多相关《ITU-T T 43-1997 Colour and Gray-Scale Image Representations Using Lossless Coding Scheme for Facsimile - Series T Terminals for Telematic Services (Study Group 8 17 pp)《传真中使用无损编码方案.pdf(17页珍藏版)》请在麦多课文档分享上搜索。
1、INTERNATIONAL TELECOMMUNICATION UNION lTU=T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU T.43 (07/97) SERIES T: TERMINALS FOR TELEMATIC SERVICES Colour and gray-scale image representations using lossless coding scheme for facsimile ITU-T Recommendation T.43 (Previously CCITT Recommendation) ITU-T
2、 T-SERIES RECOMMENDATIONS TERMINALS FOR TELEMATIC SERVICES For further details. please refer to TU-T List of Recommendations. ITU-T RECOMMENDATION T.43 COLOUR AND GRAY-SCALE IMAGE REPRESENTATIONS USING LOSSLESS CODING SCHEME FOR FACSIMILE Summary This Recommendation defines a colour data representat
3、ion method in order to make it possible to interchange colour and gray-scale image data using Recommendation T.82 coding scheme over facsimile communication services such as Group 3 and Group 4 facsimile. In this Recommendation, three types of images are treated. The first one is one bit per colour
4、CMY(K) or RGB image. The second one is palettized colour image in which palette tables are specified with CIELAB colour space defined in Recommendation T.42. The last one is continuous-tone colour and gray-scale image specified with CIELAB colour space defined in Recommendation T.42. Source ITU-T Re
5、commendation T.43 was prepared by ITU-T Study Group 8 (1 997-2000) and was approved under the WTSC Resolution No. 1 procedure on the 2nd of July 1997. Recommendation T.43 (07/97) 1 FOREWORD ITU (International Telecommunication Union) is the United Nations Specialized Agency in the field of telecommu
6、ni- cations. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of the ITU. The ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World T
7、elecommunication Standardization Conference (WTSC), which meets every four years, establishes the topics for study by the ITU-T Study Groups which, in their turn, produce Recommendations on these topics. The approval of Recommendations by the Members of the ITU-T is covered by the procedure laid dow
8、n in WTSC Resolution No. 1. In some areas of information technology which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with IS0 and IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indicate both a telecommunicat
9、ion administration and a recognized operating agency. INTELLECTUAL PROPERTY RIGHTS The ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. The ITU takes no position concerning the evidence, va
10、lidity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside of the Recommendation development process. As of the date of approval of this Recommendation, the ITU hadhad not received notice of intellectual property, protected by patents, which ma
11、y be required to implement this Recommendation. However, implementors are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database. O ITU 1997 All rights reserved. No part of this publication may be reproduced or utilized in any
12、 form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the ITU. ii Recommendation T.43 (07/97) CONTENTS 1 Scope 2 Field of application . 3 References 4 Definitions 5 Conventions 6 Image representation method . 6.1 Overview . 6.2 Colo
13、ur representation One bit per colour CMY(K) or RGB image representation Palettized colour image representation 6.2.1 6.2.2 6.2.3 Continuous-tone colour and gray-scale image representation . 7 Data structure specification BCIH structure and entry classification BCID structure and application rule for
14、 encoding scheme . Usage ofT.82 encoding scheme (JBIG) . 7.1 Overview . 7.2 7.2.1 BCIH structure 7.2.2 Definition of entries 7.3.1 Gray code conversion 7.3.2 7.3.3 Other encoding schemes . 7.3 Recommendation T.43 (07197) Page 1 1 1 1 1 2 2 2 2 3 3 4 4 5 5 5 7 8 9 11 . 111 Recommendation T.43 COLOUR
15、AND GRAY-SCALE IMAGE REPRESENTATIONS USING LOSSLESS CODING SCHEME FOR FACSIMILE (Geneva, 1997) 1 Scope This Recommendation defines colour and gray-scale image representation and their coding schemes in order to make it possible to interchange colour and gray-scale image data such as one bit per colo
16、ur CMY(K) or RGB image, palettized colour image, and/or continuous-tone colour and gray-scale image, using lossless coding scheme over a facsimile communication service such as Group 3 or Group 4 facsimile. Its purpose is to specify representation and lossless coding schemes for three types of colou
17、r and gray-scale images. The first one is one bit per colour CMY(K) or RGB image. The second one is palettized colour image. The last one is continuous-tone colour and gray-scale image. This Recommendation, together with documents such as parts of Recommendations T.4 and T.30, or T.563, T.503 and T.
18、521, will define a colour image data format that may be used by colour facsimile service and by other telematic services. In this Recommendation, the coding scheme specified in Recommendation T.82 (JBIG) is used for lossless encoding of these three types of colour and gray-scale images. Application
19、of other coding schemes are for further study. 2 Field of application This Recommendation defines a colour data representation and coding scheme which mainly enables a receiver to reproduce colour image data as specified by the sender. It is assumed that when a service is performed using this Recomm
20、endation, all non-basic features are subject to negotiation. 3 References The following ITU-T Recommendations and other references contain provisions which, througth reference in this text, constitute provisions of this Recommendation. At the time of publication, the editions indicated were valid. A
21、ll Recom- mendations and other references are subject to revision; ail users of this Recommendation are therefore encouraged to investigate the possibility of applying the most recent edition of the Recommendations and other references listed below. A list of the currently valid ITU-T Recommendation
22、s is regularly published. - - IT-T Recommendation T.42 (1 996), Continuous-tone colour representation method for facsimile. ITU-T Recommendation T.82 (1993) I ISO/IEC 1 1544: 1993, Information technology - Coded representation of picture und audio information - Progressive bi-level image compression
23、. (Commonly referred to as JBIG standard) 4 Definitions The definitions in Recommendations T.42 and T.82 apply to this Recommendation unless explicitly amended. 4.1 Recommendation T.82, which was defined by this group. JBIG: Joint Bi-level Image Experts Group, and also shorthand for the encoding met
24、hod, described in 5 Conventions The conventions in Recommendations T.42 and T.82 apply to this Recommendation. Recommendation T.43 (07/97) 1 6 Image representation method 6.1 Overview In this Recommendation, the representation methods for three types of colour and gray-scale images that require loss
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