1、STD-ITU-T RECMN T-84 AMD 1-ENGL 1999 = 48b2591 Obblb79 lb5 9 INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU T.84 Amendment 1 (04/99) SERIES T: TERMINALS FOR TELEMATIC SERVICES Information technology - Digital compression and coding of continuous-tone stil
2、l images: Extensions Amendment 1 : Provisions to allow registration of new compression types and versions in the SPIFF header ITU-T Recommendation T.84 - Amendment 1 (Previously CCITT Recommendation) ITU-T T-SERIES RECOMMENDATIONS TERMINALS FOR TELEMATIC SERVICES For firther details, please refer to
3、 ITU-T List of Recommendations. STD-ITU-T RECMN Ta84 AND 1-ENGL 1999 m 48b259L ObbLLL 13 INTERNATIONAL STANDARD 10918-3 ITU-T RECOMMENDATION T.84 INFORMATION TECHNOLOGY - DIGITAL COMPRESSION AND CODING OF CONTINUOUS-TONE STILL IMAGES: EXTENSIONS AMENDMENT 1 Provisions to allow registration of new co
4、mpression types and versions in the SPIFF header Summary Amendment 1 to ITU-T Rec. T.84 I ISO/IEC 10918-3 allows registration of new compression types and versions in the SPIFF (the standard PEG file format) header. Source The ITU-T Recommendation T.84, Amendment 1 was approved on the 1st of April 1
5、999. The identical text is also published as ISODEC International Standard 109 18-3. ITU-T Rec. T.84 (1996)/Amd.l(1999 E) 1 - _ FOREWORD ITU (International Telecommunication Union) is the United Nations Specialized Agency in the field of telecommuni- cations. The ITU Telecommunication Standardizatio
6、n 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 Telecommunication Standardization Conference (WTSC), w
7、hich 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 down in WTSC Resolution No. 1. In some areas of informat
8、ion 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 term recognized operating agency (ROA) includes any individual, company, corporation or governmental organization that operates a public co
9、rrespondence service. The terms Administration, ROA and public correspondence are defined in the Constitution of the ITU (Geneva, 1992). 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
10、 Intellectual Property Right. The ITU takes no position concerning the evidence, validity 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
11、had not received notice of intellectual property, protected by patents, which may 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 1999 All r
12、ights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the ITU. 11 ITU-T Rec. T.84 (1996)/Amd.l(1999 E) CONTENTS 1) Subclause F.2.1 . 2) Subclause F.2.1
13、. 3) New subclause F.2.1.2 ITU-T Rec. T.84 (1996)/Amd.l (1999 E) Page 1 1 1 . 111 STD-ITU-T RECNN T-84 AND la-ENGL 1999 W ri8b2591 ObblL84 522 m ISO/IEC 10918-3 : 1997/Amd.3 : 1999 (E) INTERNATIONAL STANDARD ITU-T RECOMMENDATION INFORMATION TECHNOLOGY - DIGITAL COMPRESSION AND CODING OF CONTINUOUS-T
14、ONE STILL IMAGES: EXTENSIONS AMENDMENT 1 Provisions to allow registration of new compression types and versions in the SPIFF header 1) Subclause F.2.1 Replace the parameter definition of VERS with: VERS: This parameter identifies the version number of this SPIFF specification that the file complies.
15、 The parameter is defined as a two-byte integer with the most significant byte containing the major revision number and the least significant byte containing a minor revision number. In order to make this file format as flexible as possible, a provision has been made that allows new parameter values
16、 in the header of a SPIFF file which are not specified in this Recommendation I International Standard. The value of VERS will increase when these new parameter values are present. The method of adding these new parameter values to this Recommendation I International Standard and the conditions whic
17、h apply when these new values are found is specified in F.2.1.2. 2) Subclause F.2.1 Replace Compression type of the parameter definition of C: “Compression type - Specifies the compression algorithm used to compress the image data:“ with: Compression type - Specifies the compression algorithm used t
18、o compress the image data. Additional new parameters are specified via the registration process defined in ITU-T Rec. T.86 I ISOAEC 10918-4 to support new types of compressions, such as JPEG-LS (ISOAEC 14495 -to be published) and Multicomponent JPEG (ISODEC 14493 - to be published) , 3) New subclaus
19、e F.2.1.2 Add a new subclause F.2.1.2: F.2.1.2 Addition of new header parameter values These shall only be added through a registration procedure specified in ITU-T Rec. T.86 I ISODEC 10918-4, or by formai amendment or revision of this Recommendation I International Standard. This registration proce
20、dure specifies a new and increased value for the parameter VERS on each occasion that a registration is accepted by the registration authority responsible for registration in accordance with ITU-T Rec. T.86 I ISODEC 10918-4. Encoders are encouraged to ensure that the value of VERS used is the lowest
21、 version that includes the information required to understand the file format. ITU-T Rec. T.84 (1996)/Amd.l (1999 E) 1 ;cries A Series B series C Series 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 S
22、eries U Series V Series X Series Y Series Z ITU-T RECOMMENDATIONS SERIES Organization of the work of the ITU-T Means of expression: definitions, symbols, classification General telecommunication statistics General tariff principles Overall network operation, telephone service, service operation and
23、human factors Non-telephone telecommunication services Transmission systems and media, digital systems and networks Audiovisual and multimedia systems Integrated services digital network Transmission of television, sound programme and other multimedia signals Protection against interference Construc
24、tion, installation and protection of cables and other elements of outside plant TMN and network maintenance: international transmission systems, telephone circuits, telegraphy, facsimile and leased circuits Maintenance: international sound programme and television transmission circuits Specification
25、s 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 communications Global information infrastructure Languages and general software aspects for telecommunication systems Printed in Switzerland Geneva, 1999
