1、 STD-ITU-T RECMN Ta417 AMD 1-ENGL 1777 W 48b2571 ObYb231 727 W I NTERN AT1 O NAL TELECOM M U N I CAT I ON U N i ON ITU=T TELECOMMUNICATION STAN DARD I ZAT I O N SECTOR OF ITU T.417 Amendment I (1 0197) SERIES T: TERMINALS FOR TELEMATIC SERVICES Information technology - Open Document Architecture (OD
2、A) and interchange format: Raster graphics content architectures Amendment I ITU-T Recommendation T.417 - Amendment 1 (Previously CCITT Recommendation) ITU-T T-SERIES RECOMMENDATIONS TERMINALS FOR TELEMATIC SERVICES For further details, please refer to ITU-T List of Recommendations. INTERNATIONAL ST
3、ANDARD 8613-7 ITU-T RECOMMENDATION T.417 INFORMATION TECHNOLOGY - OPEN DOCUMENT ARCHITECTURE (ODA) AND INTERCHANGE FORMAT: RASTER GRAPHICS CONTENT ARCHITECTURES AMENDMENT i Summary Amendment 1 to Recommendation T.417 I ISO/IEC 8613-7 supports the use of JBIG and JPEG colour in applications using ras
4、ter graphics content. Source The ITU-T Recommendation T.417, Amendment 1 was approved on the 16th of October 1997. The identical text is also published as ISO/IEC International Standard 8613-7. ITU-T Rec. T.417 (1993)/Amd.l (1997 E) i STD-ITU-T RECMN T-q17 AND 1-ENGL 1997 48b2591 Oblib231r b38 W FOR
5、EWORD IT (International Telecommunication Union) is the United Nations Specialized Agency in the field of telecommuni- 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 an
6、d 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, in their turn, produce Recommendation
7、s 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 information technology which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with IS0 and IEC. NOT
8、E In this Recommendation, the expression “Administration” is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. INTELLECTUAL PROPERTY RIGHTS The 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. 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
10、of this Recommendation, the IT 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 pa
11、tent database. O ITU 1998 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 from the ITU. 11 ITU-T Rec. T.417 (1993)/Amd.l (1997 E) CONTENTS Subclau
12、se 2.1 . Subclause 2.3 . . Clause 3 : Clause 4 Subclause 7.4 . Subclause 9.1.1 Subclause 9.2.8 Subclause 9.2.1 O New subclause 9.2.11 to 9.2.18 Subclause 10.3 . Subclause 10.4 . New subclause 1 1.8 and 11.9 . Subclause 14.2 . Annex A . Annex B . ITU-T Rec . T.417 (1993)/Amd.l (1997 E) Page 1 1 1 2 4
13、 4 6 6 7 8 10 11 12 13 14 . 111 STDsITU-T RECMN T-417 AMD 1-ENGL 1977 i862571 Oblib23b 400 ISOAEC 8613-7 : 1994lAmd.l : 1998 (E) INTERNATIONAL STANDARD ITU-T RECOMMENDATION INFORMATION TECHNOLOGY - OPEN DOCUMENT ARCHITECTURE (ODA) AND INTERCHANGE FORMAT: RASTER GRAPHICS CONTENT ARCHITECTURES AMENDME
14、NT 1 1) Subclause 2.1 Add by numerical order: - CCITT Recommendation T.81 (1992) I ISO/IEC 10918-1:1993, Information technology - Digital - ITU-T Recommendation T.82 (1993) I ISO/IEC 11544:1993, Information technology - Coded compression and coding of continuous-tone still images - Requirements and
15、guidelines. representation of picture and audio information - Progressive bi-level image compression. 2) Subclause 2.3 Add at the end of this subclause: - ITU-T Recommendation T.42 ( 1994), Continuous-tone colour representation method for facsimile. 3) Clause 3 Replace the paragraph by: For the purp
16、ose of this Recommendation I International Standard, the definitions given in ITU-T Rec. T.411 I ISODEC 8613-1 apply. For the purposes of this Recommendation 1 Intemational Standard, the following definitions also apply. 3.1 JPEG definitions The terms defined in CCITT Rec. T.81 I ISODEC 10918-1 appl
17、y. 3.2 JBIG definitions The terms defined in IT-T Rec. T.82 I ISO/IEC 1 1544 apply. 3.3 Additional definitions The following terms are defined in this Specification. 3.3.1 symbols from the sequence of bits produced by the arithmetic encoder. 3.3.2 recursive subdivision of the probability of the sequ
18、ence of symbols coded up to that point. 3.3.3 CCITT Rec. T.81 1 ISODEC 10918-1, and which is required for all DCT-based decoding processes. 3.3.4 groups of 8 x 8 blocks from each component in a scan. 3.3.5 (adaptive) (binary) arithmetic decoding: An entropy decoding procedure which recovers the sequ
19、ence of (adaptive) (binary) arithmetic encoding: An entropy encoding procedure which codes by means of a baseline (sequential): A particular sequential DCT-based encoding and decoding process specified in block-interleaved: The descriptive term applied to the repetitive multiplexing in a specific or
20、der of small component: One of the two-dimensional arrays which comprise an image. ITU-T Rec. T.417 (1993)/Amd.l (1997 E) 1 3.3.6 produced by the entropy encoder. 3.3.7 such that the average number of bits per symbol approaches the entropy of the input symbols. 3.3.8 hierarchical: A mode of operatio
21、n for coding an image in which the first frame for a given component is followed by frames which code the differences between the source data and the reconstructed data fiom the preceding fiame for that component. Resolution changes are allowed between frames. 3.3.9 Huffman encoding: An entropy enco
22、ding procedure which assigns a variable length code to each input symbol. The more probable symbols are assigned shorter codes. 3.3.10 Huffman table: The set of variables length codes required in a Huffman encoder and Huffinan decoder. 3.3.11 interleaved: The descriptive term applied to the repetiti
23、ve multiplexing of small groups of data units from each component in a scan in a specific order. 3.3.12 Rec. T.82 I ISO/IEC 11544. 3.3.13 Rec. T.81 I ISOAEC 10918-1. 3.3.14 decoding procedure(s) is identical to the input to the encoding procedure(s). 3.3.15 3.3.16 non-information preserving: See los
24、sy. 3.3.17 one component. 3.3.18 progressive (coding): entropy decoding: A lossless procedure which recovers the sequence of symbols fiom the sequence of bits entropy encoding: A lossless procedure which converts a sequence of input symbols into a sequence of bits JBIG: The abbreviation of Joint Bi-
25、level Image Experts Group. It is used as the synonym for ITU-T JPEG: JPEG is the abbreviation of Joint Photographic Experts Group. It is used as a synonym for CCITT lossless: A descriptive term for encoding and decoding processes and procedures in which the output of the lossy: A descriptive term fo
26、r encoding and decoding processes which are not lossless. non-interleaved: The descriptive term applied to the data unit processing sequence when the scan has only a) b) One of the DCT-based processes defined in CCITT Rec. T.81 1 ISOAEC 10918-1 in which each scan typically improves the quality of th
27、e reconstructed image. TA1 1 ISODEC 10918-11. A method of coding an image in which the image may be segmented into stripes, and then the entire image is first coded as a lowest resolution layer image and then is successively increased in resolution by means of differential layer images. This is comp
28、atible, by stripelayer data reordering with progressive coding. T.82 I ISO/IEC 115443. 3.3.19 scaled in order to achieve compression. 3.3.20 3.3.21 3.3.22 each component of the image is encoded within a single scan. 3.3.23 quantization (uniform): The procedure by which Discrete Cosine Transform (DCT
29、) coefficients are linearly quantization table: The set of 64 quantization values used to quantize the DCT coefficients. sample: One element in the two-dimensional array which comprises a component. sequential coding: One of the lossless or DCT-based coding processes defined in the JPEG standard in
30、which stripe: A fixed vertical size region of an image which encompasses the entire horizontal width of that image. 4) Ciause 4 Replace the existing abbreviations by: AAH AAV BDH Horizontal Block Dimension BDV Vertical Block Dimension DL Differential Layer DP Deterministic Prediction EOFB End-of-Fac
31、simile-Block JBIG Horizontal dimension of available area Vertical Dimension of available area Joint Bi-level Image experts Group 2 ITU-T Rec. T.417 (1993)Amd.l (1997 E) JPEG MSB NLC NPC PS RTC SR TP Joint Photographic Experts Group Most Significant Bit Number of Lines of the Clipped array Number of
32、Pels per line of the Clipped array Pel Spacing Return-to-Control Spacing Ratio Typical Prediction 5) Subclause 7.4 Change last paragraph to read The content of each tile may be encoded according to IT-T Recs. T.4, T.6, T.4 - MSB, T.6 - MSB, JPEG, JBIG with bits per colour component = 1, JBIG with bi
33、ts per colour component 1 or bitmap encoded as specified by the coding attributes. Alternatively, it may be omitted if the pels within the tile are either all foreground or all background. 6) Subclause 9.1.1 Replace this subclause by: 9.1.1 Type of coding CLASSIFICATION: Defaultable APPLICABILITY: S
34、TRUCTURE: PERMISSIBLE VALUES: Formatted and formatted processable content architecture class. ASN. 1 object identifier or non-negative integer. The permissible values for this attribute depend on the value of the attribute “bits per colour component“ as follows: “bits per colom component“ = 1 : ASN.
35、l object identifier: 2 8 3 7 O for Rec. T.6 encoding, 2 8 3 7 1 for Rec. T.4 one-dimensional encoding, 2 8 3 7 2 for Rec. T.4 two-dimensional encoding, 2 8 3 7 3 for bitmap encoding, 2 8 3 7 5 for tiled encoding, 2 8 3 7 6 for Rec. T.6 encoding - MSB, 2 8 3 7 7 for Rec. T.4 one-dimensional encoding
36、- MSB, 2 8 3 7 8 for Rec. T.4 two-dimensional encoding - MSB, 2 8 3 7 12 for JBIG encoding with bits per colour component = l, non-negative integer: 1 for Rec. T.6 encoding. “bits per colour component“ 1 : ASN. 1 object identifier: 2 8 3 7 9 for direct value encoding, 2 8 3 7 10 for octet run-length
37、 encoding, 2 8 3 7 11 for packed index encoding, 2 8 3 7 13 for JPEG encoding, 2 8 3 7 14 for JBIG encoding with bits per colour component 1. NOTE - The use of Rec. T.6 encoding - MSB; Rec. T.4 one-dimensional encoding - MSB; and Rec. T.4 two-dimensional encoding - MSB is applicable to ITU-T Rec. T.
38、417 only. ITU-T Rec. T.417 (1993)/Amd.l (1997 E) 3 ISOAEC 8613-7 : 1994/Amd.l : 1998 (E) DEFAULT VALUE: The default value for this attribute depends on the value of the attribute “bits per colour component“ as follows: “bits per colour component“ = 1 : Rec. T.6 encoding, “bits per colour component“
39、1 : JPEG encoding DEFINITION: For the raster graphics content architectures, the possible values of this attribute are: - - Rec. T.6 encoding, for the two-dimensional encoding scheme defined in CCITT Rec. T.6; Rec. T.4 one-dimensional encoding, for the one-dimensional encoding scheme defined in ITU-
40、T Rec. T.4; Rec. T.4 two-dimensional encoding, for the two-dimensional encoding scheme defined in ITU-T Rec. T.4; - - bitmap encoding; - Rec. T.6 encoding - MSB, for the two-dimensional encoding scheme defined in CCITT Rec. T.6 and where the first bit of the encoded T.6 data is allocated to the most
41、 significant bit of the first octet; Rec. T.4 one-dimensional encoding - MSB, for the one-dimensional encoding scheme defined in ITU-T Rec. T.4 and where the first bit of the encoded T.4 data is allocated to the most significant bit of the first octet; Rec. T.4 two-dimensional encoding - MSB, for th
42、e two-dimensional encoding scheme defined in ITU-T Rec. T.4 and where the first bit of the encoded T.4 data is allocated to the most significant bit of the first octet; JPEG encoding for the encoding scheme defined in CCITT Rec. T.81 I ISO/IEC 10918-1; JBIG encoding with bits per colour component =
43、1 for the encoding scheme defined in ITU-T Rec. T.82 1 ISO/IEC 11544. JBIG encoding with bits per colour component 1 for the encoding scheme defined in ITU-T Rec. T.82 I ISO/IEC 11544. tiled encoding for the tiling scheme defined in this Specification, the bitmap encoding scheme, the two- dimensiona
44、l coding scheme defined in CCITT Rec. T.6, or the one- or two-dimensional coding schemes defined in ITU-T Rec. T.4, the two-dimensional coding scheme defined in CCITT Rec. T.6 with MSB mapping, the one- or two-dimensional coding schemes defined in ITU-T Rec. T.4 with MSB mapping, the PEG coding sche
45、me defined in CCITT Rec. T.8 1 I ISOAEC 109 18- 1, or the JBIG encoding schemes defined in ITU-T Rec. T.82 I ISO/IEC 11544; - - - - - - - direct value encoding; - octet run-length encoding; - packed index encoding. An explanation of these coding schemes is given in clause 1 1. The value tiled encodi
46、ng indicates that the tiles in the content portion description are each encoded per the value of the associated “tile types“ attribute as defined in 9.2.8. The value of the attribute “type of coding“ of a content portion description, that conforms to this Specification, is an ASN. 1 object identifie
47、r or an integer. In coding, the relationship between the order of pels and the order of bits within an octet is such that the first pel in the order of bits is allocated to the most significant bit of an octet. The relationship between the order of pels, the order of encoded bits and the order of en
48、coded octets is the same for tiled, as for untiled bitmap, Rec. T.4, Rec. T.4 - MSB, Rec. T.6, Rec. T.6 - MSB, JPEG, JBIG with bits per colour component = 1 and JBIG with bits per colour component 1 encoding. 4 ITU-T Rec. T.417 (1993)/Amd.l (1997 E) ISOIEC 8613-7 : 1994/Amd.l : 1998 (E) 7) Subclause
49、 9.2.8 Replace this subclause by: 9.2.8 Tile types CLAS SIFICATION: Defaultable APPLICABILITY: PERMISSIBLE VALUES: Formatted processable content architecture class A sequence of one or more data elements with one of the following values: null background, null foreground, bitmap encoded, Rec. T.6 encoded, Rec. T.4 one-dimensional encoded, Rec. T.4 two-dimensional encoded, Rec. T.6 encoded - MSB, Rec. T.4 one-dimens
