1、INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU T.503 (02/2000) SERIES T: TERMINALS FOR TELEMATIC SERVICES Document application profile for the interchange of Group 4 facsimile documents ITU-T Recommendation T.503 (Previously CCITT Recommendation) ITU-T T-
2、SERIES RECOMMENDATIONS TERMINALS FOR TELEMATIC SERVICES For further details, please rer to ITD-T List of Recommendations. Recommendation UIT-T T.503 DOCUMENT APPLICATION PROFILE FOR THE INTERCHANGE OF GROUP 4 FACSIMILE DOCUMENTS Summary This Recommendation defiies a document application profile that
3、 may be used by any telematic service. Its purpose is to specify an interchange format suitable for the interchange of Group 4 facsimile documents that contain only raster graphics. Documents are interchanged in a formatted form, which enables the recipient to display or print the document as intend
4、ed by the originator. Source ITU-T Recommendation T.503 is being republished in its entirety to include five amendments and one corrigendum previously approved. The last amendment, Amendment 5, was prepared by ITU-T Study Group 8 (1997-2000) and was approved under the WTSC Resolution 1 procedure on
5、10 February 2000. ITU-T T.503 (02/2000) 1 FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications. The ITU Telecommunication Standardization Sector (U-T) is a permanent organ of ITU. ITU-T is responsible for studying techni
6、cal, 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), which meets every four years, establishes the topics for study by the ITU-T study groups which,
7、 in turn, produce Recommendations on these topics. The approval of U-T Recommendations is covered by the procedure laid down in WTSC Resolution 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.
8、 NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the possibility that the practice or implementation of this Recommendation
9、may involve the use of a claimed Intellectual Property Right. U takes no position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by U members or others outside of the Recommendation development process. As of the date of approval of this
10、Recommendation, ITU 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 databa
11、se. o mu 2001 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 microfilm, without permission in writing fiom ITU. ITU-T T.503 (02/2000) 11 CONTENTS Scope Field of application . References
12、Definitions Characteristics supported by this document application profile . 5.1 Overview . 5.2 Logical characteristics . 5.3 Layout characteristics 5.4 Content characteristics Definition of the document application profile . 6.1 Overview . 6.2 Definition of document structure 6.3 Definition of attr
13、ibute values . 6.4 Content architectures . Annex A Format of the values of the attributes “object identifier“ . B.l Introduction . B.2 References . B.3 Definitions . B.4 Characteristics supported by this document application profile B.5 Definition of the document application profile . B.6 B.7 Prefer
14、red Huffman tables for T.81 encoding . B.8 JPEG data structure on continuous-tone image . B.9 ASN.l definition for this annex C.l Introduction . C.2 References . C.3 Definitions . C.4 Characteristics supported by this document application profile C.5 Definition of the document application profile .
15、C.6 C.7 ASN.l definition for this annex Annex B Extension for continuous-tone colour and gray-scale image documents . Definition of the document application profile for soft-copy communication Annex C Extension for colour and gray-scale image documents using Recommendation T.43 . Definition of the d
16、ocument application profile for soft-copy communication Page 1 1 1 2 2 2 2 2 2 3 3 3 4 6 7 7 7 7 8 8 9 10 10 10 16 22 22 22 22 22 23 26 26 1 ITU-T T.503 (02/2000) 111 Recommendation T.503 DOCUMENT APPLICATION PROFILE FOR THE INTERCHANGE OF GROUP 4 FACSIMILE DOCUMENTS 1 Scope 1.1 This Recommendation
17、defines a document application profile conforming to the T.410 series of Recommendations. Its purpose is to specify an interchange format suitable for the interchange of Group 4 facsimile documents that contain only raster graphics. Documents are interchanged in a formatted form, which enables the r
18、ecipient to display or print the document as intended by the originator. 1.2 may be used by any telematic service. This Recommendation, together with designated parts of T.563, defiies a document application profile that 2 Field of application 2.1 This Recommendation defines a document application p
19、rofile that is in conformance with the T.410 series of Recommendations and that allows Group 4 facsimile documents to be interchanged only in a formatted form, which allows a recipient to reproduce the document as intended by the originator. 2.2 the encoded documents. This document application profi
20、le is designed to be independent of the means used to create or to interchange 2.3 categories: a) b) c) The features which can be interchanged used this document application profile fall into the following Page format features - these concern how the layout of each page of a document will appear whe
21、n reproduced; Raster-graphics layout and imaging features - these concern how the document content will appear within the pages of the reproduced document; Raster-graphics coding - these concern the raster graphics representations and control functions that make up the document raster-graphics conte
22、nt. 2.4 non-basic features are subject to negotiation. It is assumed that, when negotiation is performed by the service using this document application profile, all 3 References The following ITU-T Recommendations and other references contain provisions which, through reference in this text, constit
23、ute provisions of this Recommendation. At the time of publication, the editions indicated were valid. Ail Recommendations and other references are subject to revision; all users of this Recommendation are therefore encouraged to investigate the possibility of applying the most recent edition of the
24、Recommendations and other references listed below. A list of the currently valid ITU-T Recommendations is regularly published. - ITU-T Recommendation T.6 (1988), Facsimile coding schemes and coding control functions for Group 4 facsimile apparatus. ITU-T T.41 O series of Recommendations, Open Docume
25、nt Architecture (ODA) and interchange format. - ITU-T Recommendation T.417 (1993) I ISO/IEC 8613-7:1994, Information technology - Open document architecture (ODA) and interchange format: Raster graphics content architecture. ITU-T Recommendation T.563 (1 996), Terminal characteristics for Group 4 fa
26、csimile apparatus. ITU-T Recommendation X.680 (1997) I ISO/IEC 8824-1 :1998, Information technology - Abstract Syntax Notation One (ASN. 1): Specijcation of basic notation. ITU-T Recommendation X.681 (1997) I ISO/IEC 8824-2:1998, Information technology - Abstract Syntax Notation One (ASN. 1): Inform
27、ation object specijcation. ITU-T T.503 (02/2000) 1 - ITU-T Recommendation X.682 (1997) I ISO/IEC 8824-3:1998, Information technology - Abstract Syntax Notation One (ASN. 1): Constraint specijcation. ITU-T Recommendation X.683 (1997) I ISO/IEC 8824-4:1998, Information technology - Abstract Syntax Not
28、ation One (ASN. 1): Parameterization of ASN. 1 specijcations. ITU-T Recommendation X.690 (1997) I ISO/IEC 8825-1:1998, Information technology -ASN. 1 encoding rules - Specijcation of Basic Encoding Rules (BER), Canonical Encoding Rules (CER) and Distinguished Encoding Rules - - PER). 4 Definitions T
29、he defiiitions in Recommendation T.411 apply to this Recommendation. 5 Characteristics supported by this document application profile 5.1 Overview A Group 4 facsimile document is the result of a formatting process and therefore the purpose of this document application profile is to allow transfer of
30、 the complete layout of the document. Only one category of content is allowed within the same page, namely: raster graphics content (per ITU-T Recommendation T.417) as used by facsimile Group 4 apparatus. This section specifies the functional description of the features supported by this document ap
31、plication profile. 5.2 Logical characteristics Not applicable. 5.3 Layout characteristics 5.3.1 Layout document structure A document is seen as a succession of pages. The content of a page is: raster graphics content architecture. 5.3.2 Document structure elements 5.3.2.1 Page format 5.3.2.1.1 The d
32、ocument is imaged in a text area which must be within the assured reproduction area. 5.3.2.1.2 The dimensions of the assured reproduction area depend on the paper used. 5.3.2.1.3 The possible paper formats are defiied in Recommendation T.563. 5.3.2.1.4 Only the vertical orientation of the page is pe
33、rmitted. 5.3.2.2 Block Not applicable (the content is directly related to the page). 5.4 Content characteristics The Group 4 facsimile document contains raster graphics in facsimile Group 4 format. 5.4.1 Raster-graphics content 5.4.1.1 Raster-graphics imaging The content of raster-graphics is define
34、d by the dimensions of the page and the number of pels per line, in accordance with Table 2/T.563. 2 ITU-T T.503 (02/2000) 5.4.1.2 Pel spacing, line spacing and pel transmission density This property defiies the distance between successive pels on a line and between successive lines of pels. The bas
35、ic value is 6 BMU, corresponding to 200 pels per 25.4 mm. It is also the default value. The non-basic values are 1, 2, 3, 4 and 5 BMU, respectively corresponding to 1200, 600, 400, 300 and 240 pels per 25.4 mm. 5.4.2 Received document This document application profile, being limited to formatted for
36、m, does not support any features to facilitate processing of an interchanged document by a receiver. 6 Definition of the document application profile 6.1 Overview 6.1.1 Document architecture level This document profile makes use of document architecture class FDA, as defiied in Recommendation T.412.
37、 A document according to this document architecture profile includes a specific layout structure only. The document architecture level is defined in Tables 2,3 and 4. The specific layout structure is always present in any document conforming to this document application profile. 6.1.2 Content archit
38、ecture level The content architecture level that may be used in documents conforming to this document application profile is as follows: raster graphics formatted content architecture level, defined in Tables 5 and 6. The coding method to be used is that defined by Recommendation T.6. In addition, a
39、ny non-basic features defiied in Recommendation T.6 may be used, provided that they are indicated in the document profile. 6.1.3 Document profile level The document profile level used in this document application profile is defiied in Table 1. Every document interchanged in accordance with this docu
40、ment application profile must include a document profile. Every non-basic attribute value used in a document must be indicated in the document profile. 6.1.4 Interchange format class The interchange format class used in this document application profile is “B“, as defined in Recommendation T.415. 6.
41、2 Definition of document structure 6.2.1 Specific layout structure The number of hierarchical levels is 2, namely: - document layout root; - page. The document layout root and page levels are mandatory. Only one content portion must be associated with each page. 6.2.2 Generic layout structure Not ap
42、plicable. ITU-T T.503 (02/2000) 3 6.3 Definition of attribute values The attributes applicable to layout components are defined in Table 2. The following notation is used in this table: - m mandatory attribute nm non-mandatory attribute d defaultable attribute Capital letters (M, NM and D) are used
43、for groups of attributes. The allowable attribute values for object descriptions are defined in Table 3. attribute not applicable to object description Table 1.503 - Document profile attributes Attribute Document profile descriptor Specific layout structure Document characteristics Document Applicat
44、ion Profile Document architecture class No basic document charact. Page dimensions (Note 1) Type of coding Raster graphics coding attributes Compression Raster graphics presentation features Pel transmission density Value M m M m m NM nm nm NM nm NM nm Permissible values Present Group 4 fax Formatte
45、d North American letter = (10 200, 13 200 fixed or variable) IS0 B4 = (1 1 81 1, 16 677 fixed or variable) IS0 B3 = (14 030, 19 840 fixed or variable) Japanese legal = (12 141, 17 196 fixed or variable) Japanese letter = (8598, 12 141 fixed or variable) North American legal = (10 200, 16 800 fixed o
46、r variable) North American ledger = (13 200,20 400 fixed or variable) (Note 2) T.85 single-progression (Note 3) Uncompressed 5 BMU (240 peld25.4 m) 4 BMU (300 peld25.4 m) 3 BMU (400 peld25.4 m) 2 BMU (600 peld25.4 m) 1 BMU (1200 peld25.4 m) NOTE 1 - This dimension attribute is represented as a data
47、element which consists of two integers. Two integers speci$ width and height of a page in basic measurement units (BMUs). NOTE 2 - An indefinite page length is represented by a variable measure in the vertical dimension. The value of this data is then arbitrary and should be the nominal page length.
48、 NOTE 3 - If basic Lo is supported, object ID (0020850) shall be indicated. If optional Lo is supported, object ID (0020851) shall be indicated. When object ID (0020851) is indicated, object ID (0020850) shall also be indicated. This is the coding scheme defined in clause 4/T.85. 4 ITU-T T.503 (02/2
49、000) Table 2/T.503 - Attributes applicable to layout components Shared attributes Object type Object identifier Subordinate Content portions Default value lists Layout attributes Presentation attributes Dimensions Attribute Attribute Document layout root Page Table 3.503 - Attribute values for layout object descriptions Shared attributes Object type Object identifier Subordinate Content portions Default value lists Layout attributes Presentation attributes Dimensions (Note 1) m nm - nm - d d Basic value Document layout root, Page As defined in Rec. T.412 (see also Annex A) A
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