1、INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU T.85 Amendment 1 (1 0/96) SERIES T: TERMINALS FOR TELEMATIC SERVICES Application profile for Recommendation T.82 - Progressive bi-level image compression (JBIG coding scheme) for facsimile apparatus Amendment
2、 I ITU-T Recommendation T.85 - Amendment I (Previously CCIlT Recommendation STD-ITU-T RECMN T.85-ENGL L77b m 48b2571 Ob33547 L3L ITU-T T-SERIES RECOMMENDATIONS TERMINALS FOR TELEMATIC SERVICES For further details, please refer to ITU-T List of Recommendations. STD-ITU-T RECMN T-Et-ENGL L77b = LiAb25
3、7L Ob33550 753 FOREWORD The ITU-T (Telecommunication Standardization Sector) is a permanent organ of the International Telecommunication Union (ITU). The JTU-T is responsible for studying technical, operating and tariff questions and issuing Recommen- dations on them with a view to standardizing tel
4、ecommunications on a worldwide basis. The World Telecommunication 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
5、of the ITU-T is covered by the procedure laid down in WTSC Resolution No. 1 (Helsinki, March 1-12, 1993). Amendment 1 to ITU-T Recommendation T.85 was prepared by ITU-T Study Group 8 (1993-1996) and was approved by the WTSC (Geneva, 9-18 October 1996). NOTE In this Recommendation, the expression “Ad
6、ministration” is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. O ITU 1997 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and mic
7、rofilm, without permission in writing from the ITU. Recommendation T.8YAmd.l (10/96) 1 STD-ITU-T RECMN T-85-ENGL L99b 48h2571 Ob3355L 87T CONTENTS Page 1 . PART 1 -EDITORIAL CORRECTIONS TO THE MAIN BODY OF RECOMMENDATION T.85 1) Subclause 4.3 the third line 1 2) Note 4 of Table l.85 1 PART 2 - A NEW
8、 APPENDIX TO RECOMMENDATION T.85 . 1 11 Recommendation T.85/Amd.l (10/96) SUMMARY Recommendation T.85 defines the application profile of Recommendation T.82 for facsimile. This Amendment contains the following two parts: Part 1 - Editorial corrections to the main body of Recommendation T.85. Part 2
9、- A new appendix to Recommendation T.85. . Recommendation T.8YAmd.l (10196) 111 - STDeITU-T RECMN TsB5-ENGL L77b qBb2571 Ob33553 bb2 Amendment 1 to Recommendation T.85 APPLICATION PROFILE FOR RECOMMENDATION T.82 - PROGRESSIVE BI-LEVEL IMAGE COMPRESSION (JBIG CODING SCHEME) FOR FACSIMILE APPARATUS AM
10、ENDMENT 1 (Geneva, 1996) PART 1 - EDITORIAL CORRECTIONS TO THE MAIN BODY OF RECOMMENDATION T.85 1) “facsimile document” should be replaced by “facsimile page” Subclause 4.3 the third line: 2) Note 4 of Table UT.85: “OPTIONS” should be corrected to “OPTION”. PART 2 - A NEW APPENDIX TO RECOMMENDATION
11、T.85 Appendix I Examples of the usage of NEWLEN marker segment This Appendix describes examples of the usage of NEWLEN marker segment for the case when the facsimile terminal cannot identi the vertical size YD of the page to be transmitted when it starts coding. This appendix applies to the single-p
12、rogression sequential coding described in clause 4. The examples shown in this Appendix illustrate the application of 6.2.6.2T.82. I. 1 Basic mode The first two examples show the case when one page of 500 lines is transmitted in basic mode with LO = 128. One page is coded into multiple stripes with
13、the condition that the vertical length of the page is unknown when the transmitting facsimile terminal starts coding. For the first example, YD is set to Oxffffffff. Then, at the line of 500, the image data exhausts. Data stream for basic mode- BIH (YD = Oxffffffff, LO = 128, VLENGTH = 1 - Other par
14、ameters shall be set appropriately). Encoded image data of the first stripe (line 1-128). ESC, SDNORM. Recommendation T.8YAmd.l (10196) 1 STD*ITU-T RECMN T-BS-ENGL 197b W 48b257L Ob33554 5T7 Encoded image data of the second stripe (line 129-256). ESC, SDNORM. Encoded image data of the third stripe (
15、line 257-384). ESC, SDNORM. ESC, NEWLEN, New YD (= 500). Encoded image data of the fourth stripe (line 385-500). ESC, SDNORM. The following data stream is an example, where the length of the page is not known before coding the last stripe. Note that this case requires the use of a “null” stripe. Thi
16、s example will also illustrate an estimate of page length that is not the maximum possible (e.g. YD = 1024 = 0x00000400). Data stream for basic mode-2 BIH (YD = 0x00000400, LO = 128, VLENGTH = 1 - Other parameters shall be set appropriately). Encoded image data of the first stripe (line 1-128). ESC,
17、 SDNORM. Encoded image data of the second stripe (line 129-256). ESC, SDNORM. Encoded image data of the third stipe (line 257-384). ESC, SDNORM. Encoded image data of the fourth stripe (line 385-500). ESC, SDNORM. ESC, NEWLEN, New YD (= 500), ESC, SDNORM. 1.2 Option mode This example shows the case
18、of “one stripe per page” (also requires an “added” null stripe) transmission in OPTION mode. This optional mode can only be used following a successful negotiation. Note that a coder or decoder that cannot support the actual stripe size may have to terminate the call. At the beginning of encoding, a
19、s the vertical length of the page is undetermined, YD is set to the maximum value, YD = Oxffffffff (one possible choice). As the stripe size is also undetermined, LO is set to the same value as YD, LO = Oxffffffff. The actual number of the vertical lines is 500. Data stream for OPTION mode BIH (YD =
20、 Oxffffffff, Lo = Oxffffffff, VLENGTH = 1 - Other parameters shall be set appropriately). Encoded image data of the first stipe (line 1-500). ESC, SDNORM. ESC, NEWLEN, New YD (= 500). ESC, SDNORM. 2 Recommendation T.85jAmd.l (10/96) STD.ITU-T RECMN TmB5-ENGL 199b m 48b259L b33555 435 m ieries A ieri
21、es B jeries C jeries D series E Series F Series G Series H Series 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: definitio
22、ns, symbols, classification General telecommunication statistics General 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 multimedi
23、a systems Integrated services digital network Transmission of television, 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 ci
24、rcuits, telegraphy, facsimile and leased circuits Maintenance: international 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
