JPH05110737A - Transmission system for facsimile document picture information - Google Patents

Abstract

PURPOSE:To attain the reproduction of information of high quality and the improvement of a transmission efficiency by dividing document picture information sets of plural different kinds into blocks for each kind, coding the blocks with a coding method suitable for each and sending the coded information. CONSTITUTION:For example, character information of a facsimile document picture 1 is subject to coding by using a format control code and a character code in a block and the coded information is sent, and drawing/graph information is subject to coding by, e.g. the MH coding, the MR coding or a drawing description instruction or the like, the result is sent, and photographic information comprising binary picture data subjected to pseudo intermediate tone processing is coded by the MH coding, the MR coding or a non- compression form and then the result is sent. In comparison with the conventional system in which the entire pattern is coded, since only the data in the block is sent, data corresponding to the part of data such as space are not required to be sent and the transmission efficiency is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of transmitting facsimile document image information in facsimile broadcasting using a television multiplex facsimile channel, satellite broadcasting data channel and the like.

[0002]

SUMMARY OF THE INVENTION The present invention is a system in which facsimile document image information is encoded into character information, graphic / graph information, photographic information, etc. for each block and transmitted.

[0003]

2. Description of the Related Art In facsimile broadcasting, facsimile document image information is converted into character information, graphic / graph information,
There has been no transmission method of facsimile document image information in which photographic information is divided into blocks, each block is encoded, and transmitted.

[0004]

Document image information for facsimile broadcasting is produced, for example, by combining character information with information such as figures, graphs and tables, or information such as photographs. The simplest program production method is one in which character information, graphics, graphs, etc. of a printed document are read by an image scanner or the like, but in this case, high quality image information cannot be transmitted.

The facsimile document image information produced in this manner is MH (Modified Huffman) for one-dimensionally encoding the entire screen for each scanning line.
The data is encoded or transmitted by MR (Modified READ) encoding in which four scanning lines are collectively two-dimensionally encoded. In this case, one scanning line must be transmitted as the entire blank image data even for the blank portion having no information on paper. In addition, the amount of coded data may be larger than the amount of pattern data before conversion in a portion where photographic information has been subjected to pseudo-halftone processing, resulting in poor transmission efficiency.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a transmission system of facsimile document image information which solves the above problems.

[0007]

In order to achieve the above object, the present invention divides facsimile document image information consisting of a plurality of different types of image information into blocks for each type,
It is characterized in that the image information is encoded and transmitted for each block by an encoding method suitable for the image information.

[0008]

According to the present invention, a facsimile document image is coded and transmitted by a format control code and a character code in a block for, for example, character information, and, for example, MH coding, MR coding, or the like for graphic / graph information. It is encoded and transmitted by a graphic description command or the like, and for example, for photographic information, pseudo halftone processed binary image data is transmitted in MH encoding, MR encoding or non-compression format. Thus, by encoding the image information for each block by the encoding method suitable for the document image information and transmitting the encoded image information, it is possible to reproduce high-quality information and improve the transmission efficiency. Further, as compared with the conventional method of encoding the entire screen, only the data in the block is transmitted, so that it is not necessary to transmit the data of the margin and the like, and the transmission efficiency can be improved also in this respect.

[0009]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 shows an example in which the facsimile document image information before transmission is divided into blocks such as character information, graphic / graph information, and photographic information.
FIG. 2 is an example of a data transmission format for transmitting the facsimile document image information divided into blocks according to FIG. 1 for each block by an encoding method suitable for the image information and transmitting the encoded information.

As shown in FIG. 1, the paper surface (facsimile document image 1) is composed of a header area 2 for displaying a program title and a program summary, and a body area 3 for displaying program data. The one-page facsimile document image information produced on this paper is divided into a plurality of block data and transmitted as shown in FIG. One block data is composed of block management data and block transmission data.

The block management data indicates a block identification parameter for identifying the type of data transmitted in the block, a block display position on the paper, a block data length, and the like. By the block identification parameter,
Character coded transmission, geometrical transmission, binary MH encoded transmission, binary MR encoded transmission, binary uncompressed transmission, etc. are identified. The display position of the block on the paper is shown by the coordinate system shown in FIG. The coordinate system uses the upper left of the paper as the reference point,
400 dpi (16 pixels / mm) or 200
Two-dimensional coordinates when divided by dpi (8 pixels / mm). This is a facsimile receiver with a standard resolution (200 dpi) and a high resolution (400 dpi).
This is because the receiver of i) is assumed. The block position uses this 400 dpi or 200 dpi coordinate system, and specifies the upper left corner of the block as the starting point coordinates in absolute coordinates.
Specify the block length in the X-axis and Y-axis directions as a relative value from the start point coordinates. The coordinate system is 400 dpi or 200 d
The designation of pi is page management data for managing one page as a whole, and is designated together with the paper size (A4 or B4, etc.), the paper orientation (horizontal or vertical, etc.).

In the block transmission data, the block transmission data corresponding to the block identification parameter is transmitted.

For example, when the character coded transmission is designated by the block identification parameter for the blocks 1 and 3 (character information) in FIGS. 1 and 2, the character code, the typeface (Mincho, Gothic, etc.), Character control codes for controlling character size, character decoration, etc. are transmitted as block transmission data. Furthermore, in the character block, the number of characters displayed per 25.4 mm and 25.4 mm are included in the transmission data.
Specifies the number of display lines per hit as the format control in the block. The advantage of encoding and transmitting character information is that a high-quality facsimile document can be reproduced and that by decoding the received data, it does not depend on the resolution of the receiving side, and even a standard resolution receiver and a high resolution receiver can be used. However, the character information can be commonly received and processed, and high quality character information can be reproduced. The block display position coordinate value indicating the display position of the block on the paper is the start point coordinate and the block size of 40.
It is specified by the coordinate system of either 0 dpi or 200 dpi. Therefore, when the 200 dpi coordinate system is designated, the standard resolution receiver processes the block display position coordinate values as they are, and the high resolution receiver doubles the block display position coordinate values on both the X axis and the Y axis. It is necessary to process it. On the contrary, when the coordinate system of 400 doi is designated, it is necessary for the standard resolution receiver to process the block display position coordinate value to 1/2. By performing these processes, the data of the block of character information can be shared by both standard resolution and high resolution receivers.

Further, for example, when geometric transmission is designated by a parameter for the block 4 (graph information) in FIGS. 1 and 2, a graphic description command for describing a graphic such as a rectangle, a line or a circle. And the graphic display address value in the block are paired and transmitted as block transmission data. As for the block display coordinate value indicating the display position of the block on the paper surface, the processing required by each of the standard resolution and high resolution receivers is performed as in the character block. Further, regarding the graphic display address value accompanying the graphic description command, when the coordinate system of 200 dpi is designated, the graphic display address value is doubled by 400 in the high resolution receiver.
When the dpi coordinate system is designated, the standard resolution receiver performs processing for halving the graphic display address value so that the data of the block of graph / graphic information has both standard resolution and high resolution. It can be shared with other receivers.

Furthermore, for example, for blocks 2 and 5 (photograph / graphic information) of FIGS.
When the value MH code, the binary MR coded transmission, or the binary uncompressed transmission is designated, it corresponds to the number of pixels designated by the X-axis block size and the number of scanning lines designated by the Y-axis direction block size. The image data of the number of pixels to be transmitted is transmitted in the MH coded or MR coded or uncompressed format.
A transmission method for sharing a part of image data when transmitting a binary MH code and a binary MR code to a standard resolution and high resolution receiver has already been proposed in Japanese Patent Application No. 3-137911 by the present applicant. Already done. By using the same method, it is possible to share a part of the image data even for binary uncompressed transmission.

As described above, for the character information, the image data of the character information can be created by using the character font possessed by the receiving side, and the straight line, the circle, the square, etc. can be described in the graph and the like. High-quality information can be reproduced compared to character information and graph information, and image data can be MH encoded or M-coded.
The transmission efficiency can be significantly improved as compared with the case of R-coding and transmitting.

Further, the standard resolution receiver performs a simple process to halve the block display coordinate value and the like when necessary, and the high resolution receiver doubles the block display coordinate value when necessary. By itself, the block data can be shared with the standard resolution receiver and the high resolution receiver.

Although there is no difference in the reproducible quality of the graphic / photo information, non-compression or compression can be selected. Therefore, the transmission efficiency should be improved as compared with the conventional case in which the coded transmission is performed unconditionally. You can Also, some of the data can be shared for standard and high resolution receivers.

On the other hand, even when only MH or MR encoding used in ordinary facsimile broadcasting is used without performing character encoding transmission and geometric transmission, description of characters, figures, etc., excluding the blank portion on the paper surface Only the specified area is divided into blocks, and each block is binary MH encoded and binary M
Since it is possible to transmit by either R encoding or binary uncompressed transmission, it is possible to improve transmission efficiency.

[0021]

As described above, according to the present invention, it is possible to reproduce high quality information and improve the transmission efficiency. In addition, compared to the conventional method that encodes the entire screen, only the data in the block can be transmitted, so it is not necessary to transmit the data of the part such as margins, and in this respect also the transmission efficiency can be improved. Becomes

[Brief description of drawings]

FIG. 1 is a diagram showing an example in which a facsimile document image according to the present invention is divided into blocks such as character information, graphic / graph information, and photographic information.

FIG. 2 is a diagram showing an example of a data transmission format for encoding a block of a facsimile document image and transmitting the encoded document image.

FIG. 3 is a diagram for defining a display position of a block on a paper surface by a two-dimensional coordinate system. This figure shows the case where the coordinate system is 200 dpi and the paper surface is vertically placed in A4 size.

[Explanation of symbols]

 1 Facsimile document image 2 Header area 3 Body area

Claims (1)

[Claims] 1. Facsimile document image information consisting of a plurality of different types of image information is divided into blocks of each type, and the image information is encoded for each block by an encoding method suitable for the image information and transmitted. A method for transmitting facsimile document image information, characterized by: