1、STD-ITU-T RECMN T.5b3 ADD 1-ENGL 1777 D 48b2591 Ob37115 894 INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU T.563 Amendment I (07/97) SERIES T: TERMINALS FOR TELEMATIC SERVICES Terminal characteristics for Group 4 facsimile apparatus Amendment I ITU-T Reco
2、mmendation T.563 - Amendment 1 (Previously CCITT Recommendation) STD-ITU-T RECMN T.5b3 AMD 1-ENGL 1997 48b259L Ob37LLb 720 ITU-T T-SERIES RECOMMENDATIONS TERMINALS FOR TELEMATIC SERVICES Forfirther details, please refer to TU-T List of Recommendations. ITU-T RECOMMENDATION T.563 TERMINAL CHARACTERIS
3、TICS FOR GROUP 4 FACSIMILE APPARATUS AMENDMENT 1 Summary Recommendation T.563 defmes the terminal characteristics for G4 facsimile apparatus. This Amendment is to enable colour and gray-scale extension using lossless coding scheme defined in Recommendation T.43. Source Amendment 1 to ITU-T Recommend
4、ation T.563 was prepared by ITU-T Study Group 8 (1997-2000) and was approved under the WTSC Resolution No. 1 procedure on the 2nd of July 1997. Recommendation T.563/Amd.l (07/97) 1 FOREWORD ITU (International Telecommunication Union) is the United Nations Specialized Agency in the field of telecommu
5、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
6、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
7、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
8、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
9、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
10、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 11 rights reserved. No part of this publication may be reproduced or utilized in any
11、form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the ITU. 11 Recommendation T.563/Amd.l (07/97) CONTENTS Page 1) Amend 1.4 to read 1 2) Amend 2.3 to read 1 3) Add new subclause 2.6 . 1 4) Amend 3.2.8.4 to read 1 5) . Amend 3.3.6
12、 to read . 1 6) Add new subclause 3.3.7 as follows 2 . Recommendation T.563/Amd.l (07/97) . 111 STD-ITU-T RECMN T*5b3 AMD 1-ENGL 1977 m 4Bb259L Ob37120 151 m Recommendation T.563 TERMINAL CHARACTERISTICS FOR GROUP 4 FACSIMILE APPARATUS AMENDMENT 1 (Geneva, 1997) 1) Amend 1.4 to read: 1.4 is optional
13、. The basic image type of the Group 4 facsimile apparatus is black and white. Colour and gray-scale image type Other image types are for further study. 2) Amend 2.3 to read: 2.3 T.81, T.82 and T.43. The Group 4 facsimile coding scheme and facsimile control functions are defined in Recommendations T.
14、6, 3) Add new subclause 2.6: 2.6 For the colour and gray-scale image using lossless coding scheme, its representation and coding scheme for G4 facsimile is defined in Recommendation T.43. This mode is an optional colour and gray-scale mode which may only be implemented if the associated base colour
15、and gray-scale mode specified in 2.5 of this Recommendation is implemented. 4) Amend 3.2.8.4 to read: 3.2.8.4 For colour facsimile of continuous tone image as described in 3.8.5 with more than one colour component, the coding scheme defined in Recommendation T.8 1 shall be used. For colour facsimile
16、 of colour and gray- scale image using lossless coding scheme as described in 3.3.6, the coding scheme defined in Recommendation T.43 shall be used. 5) Amend 3.3.6 to read: 3.3.6 Optional functions for colour and gray-scale images using Recommendation T.81 coding scheme: colour image data are expres
17、sed by direct colour expression using colour space “CIELAB“; the basic image mode for this option is gray-scale and the optional mode is continuous tone colour; the basic value of bit per colour component is 8 bitcolour component. The optional value is 12 bitcolour component; the basic coding scheme
18、 for continuous-tone image in this extension is the baseline coding scheme of Recommendation T.81; continuous tone image may be coded losslessly by the coding scheme defined in Recommendation T.8 1 ; colour tolerance is for further study. Recommendation T.563/Amd.l (07/97) 1 STDOITU-T RECMN T.5b3 AN
19、D 1-ENGL 1797 48b2571 Ob37121 098 6 3.3.7 Add new subclause 3.3.7 as follows: Optional functions for colour and gray-scale images using bit-plane image representation and lossless coding scheme defined in Recommendation T.43 2 This mode is an optional colour and gray-scale mode which may only be imp
20、lemented if the associated base colour and gray-scale mode specified in 3.3.6 of this Recommendation is implemented. Implementation of the gray-scale mode of this subclause requires implementation of the associated gray-scale mode of 3.3.6 of this Recommendation. Similarly, implementation of the col
21、our mode of this subclause requires implementation of the associated colour mode of 3.3.6 of this Recommendation. Three image types are referred to in this option; namely, one bit per colour image, palettized-colour image and continuous-tone colourgray-scale image. Colour image data for one bit per
22、colour image are expressed by colour primaries such as “C, M, Y, (K)“ or “R, G, B“. Colour image data for palettized colour image are expressed by colour indices of the colour palette table in which each colour is specified in “CIELAB“ space. Colour image data for continuous-tone image are expressed
23、 by direct colour expression using colour space “CIELAB“; gray-scale data for continuous-tone image are expressed by direct colour expression using L* component of colour space “CIELAB“. The basic value is 8 bits gray-scale and the optional values are 8 bits colour, 12 bits gray-scale and 12 bits co
24、lour. 8 bits colour mode consists of one bit per colour image, basic palettized colour image, 8 bits gray-scale image and 8 bitscomp. continuous-tone colour image and 12 bits colour mode consists of colour images contained in the 8-bit colour mode, extended palette colour image, 12 bits gray-scale i
25、mage and 12 bitscomp. continuous-tone colour image. Basic palettized colour image is palettized image using 12 bits or less entries and 8 bitkomp. precision table. Extended palettized colour image is palettized image using 13 to 16 bits entries and 8 bitskomp. precision table or up to 16 bits entrie
26、s and 12 bitscomp. precision table. These image types are specified in Annex CT.503. Colour tolerance is for further study. Recommendation T.563/Amd.l (07/97) STD-ITU-T RECMN T*5b3 AMD 1-ENGL 1997 m 4862591 Ob37122 T24 m Series A Series B Series C Series D Series E Series F Series G Series H Series
27、I Series J Series K Series L Series M Series N Series O Series P Series Q Series R Series S Series T Series U Series V Series X Series Z ITU-T RECOMMENDATIONS SERIES Organization of the work of the ITU-T Means of expression: definitions, symbols, classification General telecommunication statistics G
28、eneral tariff principles Overall network operation, telephone service, service operation and human factors Non-telephone telecommunication services Transmission systems and media, digital systems and networks Audiovisual and multimedia systems Integrated services digital network Transmission of tele
29、vision, sound programme and other multimedia signals Protection against interference Construction, installation and protection of cables and other elements of outside plant Maintenance: international transmission systems, telephone circuits, telegraphy, facsimile and leased circuits Maintenance: int
30、ernational sound programme and television transmission circuits Specifications of measuring equipment Telephone transmission quality, telephone installations, local line networks Switching and signalling Telegraph transmission Telegraph services terminal equipment Terminals for telematic services Telegraph switching Data communication over the telephone network Data networks and open system communication Programming languages
