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INTERNATIONAL TELECOMMUNICATION UNION

ITU-T

T.4

TELECOMMUNICATION

STANDARDIZATION SECTOR

OF ITU

(07/2003)

SERIES T: TERMINALS FOR TELEMATIC SERVICES

Standardization of Group 3 facsimile terminals

for document transmission

ITU-T Recommendation T.4

ii ITU-T Rec. T.4 (07/2003)

FOREWORD

The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of

telecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of

ITU. 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 Assembly (WTSA), which meets every four years,

establishes the topics for study by the ITU-T study groups which, in turn, produce Recommendations on

these topics.

The approval of ITU-T Recommendations is covered by the procedure laid down in WTSA Resolution 1.

In some areas of information technology which fall within ITU-T's purview, the necessary standards are

prepared on a collaborative basis with ISO and IEC.

NOTE

In this Recommendation, the expression "Administration" is used for conciseness to indicate both a

telecommunication administration and a recognized operating agency.

Compliance with this Recommendation is voluntary. However, the Recommendation may contain certain

mandatory provisions (to ensure e.g., interoperability or applicability) and compliance with the

Recommendation is achieved when all of these mandatory provisions are met. The words "shall" or some

other obligatory language such as "must" and the negative equivalents are used to express requirements. The

use of such words does not suggest that compliance with the Recommendation is required of any party.

INTELLECTUAL PROPERTY RIGHTS

ITU draws attention to the possibility that the practice or implementation of this Recommendation may

involve the use of a claimed Intellectual Property Right. 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, 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 database.

 ITU 2004

prior written permission of ITU.

ITU-T Rec. T.4 (07/2003) iii

CONTENTS

Page

1 Scanning track .............................................................................................................. 1

2 Dimensions of terminals............................................................................................... 1

3 Transmission time per total coded scan line................................................................. 2

3.1 Minimum transmission time of total coded scan line..................................... 2

3.2 Maximum transmission time of total coded scan line .................................... 3

3.3 Error correction mode..................................................................................... 3

4 Coding scheme.............................................................................................................. 3

4.1 One-dimensional coding scheme.................................................................... 3

4.2 Two-dimensional coding scheme ................................................................... 8

4.3 Extended two-dimensional coding scheme .................................................... 14

4.4 Progressive bi-level image compression ........................................................ 14

5 Modulation and demodulation...................................................................................... 16

6 Power at the transmitter output..................................................................................... 17

7 Power at the receiver input ........................................................................................... 17

8 Implementation of terminals......................................................................................... 17

9 File transfer mode......................................................................................................... 17

10 Character mode............................................................................................................. 17

11 Mixed mode.................................................................................................................. 17

12 64 kbit/s option ............................................................................................................. 17

13 Continuous-tone colour and gray-scale modes............................................................. 18

14 Secure communication mode........................................................................................ 18

15 Lossless transmission mode of one bit per colour, palette-colour, continuous-tone

colour and gray-scale images using ITU-T Rec. T.43.................................................. 18

16 Mixed Raster Content................................................................................................... 18

17 Continuous-tone colour mode (sYCC) ......................................................................... 18

Annex A – Optional error correction mode ............................................................................. 18

A.1 Introduction .................................................................................................... 18

A.2 Definitions ...................................................................................................... 18

A.3 Message format .............................................................................................. 18

Annex B – Optional file transfer mode.................................................................................... 22

B.1 Introduction .................................................................................................... 22

B.2 Definitions ...................................................................................................... 22

B.3 Normative references...................................................................................... 22

B.4 Definition of the different file transfer modes................................................ 23

B.5 Coding of the file description ......................................................................... 24

B.6 Message format – Blocks structure ................................................................ 26

B.7 Protocol aspects.............................................................................................. 27

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zhangyzupc1991

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要是中文版就是五分了...... .
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许久之前下载了这份资料，还不错的。
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要是中文版就是五分了......

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