JPH03270475A - Facsimile system - Google Patents

Abstract

PURPOSE:To output a picture with the equal dimension only by a reduction processing even when the main scanning and sub scanning directions of a reader part are expressed in millimeter or expressed in inches by storing the main scanning system by the inch system and storing the sub scanning direction by the milli system. CONSTITUTION:In such a G3/G4 machine 1, the main scanning direction of a recorder part is composed of the inch system and the sub scanning direction is composed of the milli system. For the recorder part of the conventional machine, the main scanning and sub scanning directions of the G4 machine 2 are composed of the inch system and the main scanning and sub scanning directions of the G4 machine 2 are composed of the milli system. When data is transmitted from the G4 machine 2 to the G3/G4 machine 1, the magnification can be maintained as it is since the resolution of 200 picture elements/inch is transmitted as it is concerning the main scanning direction. Concerning the sub scanning direction, it is necessary to convert the read resolution of 200 lines/inch (200 line/25.4mm) to 7.7 line/mm, and in order to obtain the picture with the same dimension, the reduction processing of 97.79% is executed. Thus, communication can be mutually executed between the various group machines.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Field of Application) The present invention relates to a facsimile system that enables communication between different groups without using enlargement processing.

(Prior Art) Currently, the specifications of facsimile machines are standardized by the CCITT (International Telegraph and Telephone Consultative Committee) as Group 1 machines, Group 2 machines, Group 3 machines, and Group 4 machines.

The standard units of image resolution for Group 3 and Group 4 machines, which handle images as digital information, are millimeters for Group 3 and inches for Group 4.

Previously, Group 3 machines and Group 3/Group 4 dual-purpose machines with Group 3 specifications were millimeter-based in both the main and sub-scan directions, and Group 4 machines and Group 3/Group 4 Kanekawa machines with Group 4 specifications were is composed of inches in the main scanning and sub-scanning directions.

Therefore, when communicating from a Group 3 aircraft to a Group 3/Group 4 dual-purpose aircraft with Group 4 specifications, or from a Group 4 aircraft to a Group 3/Group 4 dual-purpose aircraft with Group 3 specifications, the recording process It was necessary to convert the resolution between the inch system and the inch system.

Here, an example of the resolution of the three machines in the group is 8 pixels/11 in the main scanning direction and 7.7 lines/square in the sub-scanning direction, while that of the four machines in the group is 200 pixels/#11 in the sub-scanning direction.
', 200 lines/V.

For example, when transmitting an image from a Group 3 machine to a Group 3/Group 4 dual-use machine with Group 4 specifications, the resolution of 8 pixels/mm in the main scanning direction is reduced to 200 pixels/#:
It is necessary to convert to a resolution of '(2oo pixels/25.4@II), and to obtain an image of equal size, it is (178)/(25,47200)-2507254(
-98.43%)...(1) reduction processing is required.

On the other hand, in the sub-scanning direction, the resolution of 7.7 lines/degree is 200 lines/$' (200 lines 725.4 m).
It is necessary to convert to a resolution of (1/7.7)/(25,4/200)-10000/ to obtain an image of equal size.
9779(-102,26%>...(2>) enlargement processing is required.

Conversely, from group 4 aircraft to group 3 with group 3 aircraft specifications
/ When transmitting an image to a group 4 dual-purpose machine, the number of pixels in the main scanning direction is 200 pixels/multiple (200 pixels/25.
It is necessary to convert the resolution of 4w+m) to the resolution of 8 pixels/pixel, and in order to obtain an image of the same size, (25,4/200)/(1/8)-254/25.
(-101,60%)...(3) enlargement processing is required.

On the other hand, in the sub-scanning direction, it is necessary to convert the resolution of 200 lines/1' (200 lines/25.4■■) to a resolution of 7.7 lines/1■, and in order to obtain an image of equal size, is (25,47200
)/(1/7.7)-9779/10000(-97,
79%)...(4) Reduction processing is required.

When this kind of processing is performed in the recording section, for example, in a laser beam printer, the scanning of the laser beam is changed to convert the millimeter system to the inch system, or the ratio of the feed gear of the recording paper transport drum is changed to convert the millimeter system to the inch system. , the inch system conversion was performed.

There are also devices that electrically reduce or enlarge image signals in order to reduce device costs.

Here, a method for electrically reducing or enlarging an image signal will be explained with reference to FIG. 2.

A blind sampling processing section 5 that obtains a reduced signal from an image signal performs a reduction process on the image signal by skipping the image signal that has been reduced.

For example, in a 98% reduction process, it is sufficient to skip one pixel out of 50 pixels.

Next, in the interpolation processing section 6 which obtains an enlarged signal from the image signal,
The image signal is enlarged by interpolating data to the input image signal.

For example, in 102% enlargement processing, pixel insertion interpolation is performed once every 50 pixels.

There are methods for interpolating data, such as performing linear interpolation from data adjacent to the location to be inserted, or inserting the data of the previous pixel as is, but all of these methods always require the memory 7 to store the data. Become.

In addition, reduction processing involves converting from something with a lot of information to something with less information, so there is little deterioration of image information, but enlargement processing converts something with little information to something with a lot of information, and predicts the image, so the image information is not degraded. Information deterioration occurs.

The block diagram shown in FIGS. 3(a) to (d) is for group 4.
machine (main scanning inch system, sub-scanning inch system, device structure IIi,
) and a group of three machines (equipment configured with main scanning millimeter system and sub-scanning millimeter system) shows how image information is enlarged/reduced during communication.

As shown in Fig. 3(b) and (d), the communication between devices in the same group (10-11, 14-15) is the same size, but in Fig. 3(a) and (C), As shown,
y (Communications between group devices (8-9, 12-13) always required both enlargement processing and reduction processing.

[The problem that the invention attempts to solve]

As mentioned above, in the conventional equipment, the three machines in the group are configured with millimeter systems for both main scanning and sub-scanning, and the four machines in group are configured with inch systems for both main scanning and sub-scanning, so each machine uses a different group of machines. When performing mutual communication, enlargement processing and reduction processing are always required.

Furthermore, the enlargement process has problems such as the need for a memory for storing previous data and the image quality deterioration caused by the enlargement process ('t').

This invention has been made in view of these problems, and its purpose is to provide a facsimile system that can realize mutual communication between different groups of machines only by reduction processing and equal magnification. There is a particular thing.

[Structure of the invention]

(Means for Solving the Problems) The present invention makes the specifications of the recording section inch-based in the main scanning direction and millimeter-based in the sub-scanning direction, and the specifications are the same in both the main-scanning direction and the sub-scanning direction. When the recording section performs recording based on the image signal from the reading section according to the specifications, the image signal is subjected to reduction processing in either the main scanning direction or the sub-scanning direction.

(Operation) In this method, the main scanning direction is stored in the inch system, and the sub-scanning direction is stored in the millimeter system. Even if both images are in inches, images can be output to the same size simply by reducing the size.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

FIG. 1 shows a connection example of a device according to an embodiment of the present invention.

As shown in the figure, in the group 3/group 4 combination machine 1 of this embodiment, the main scanning direction of the recording section is configured in inch system, and the sub-scanning direction is configured in millimeter system.

Further, in the recording section of the conventional machine, the group 4 machines 2 are configured in inches in both the main scanning and sub-scanning directions, and the group 3 machines 3 are configured in millimeters in both the main scanning and sub-scanning directions.

FIG. 1(a) shows an example of transmission from group 4 machine 2 to group 3/group 4 dual-purpose machine 1.

In the main scanning direction, the resolution of, for example, 200 pixels/V is directly transmitted to 200 pixels/multi', so the same size is sufficient.

In addition, in the secondary and scanning directions, for example, 200 lines/
$' (200 lines/25.4m) reading angle q image resolution 7
．． Need to convert to 7 lines/am, (25,4/200)/(1/7.7)-9779/1 to get equal size image
0000 (-97,79%) (5) When recording with the group 3/group 4 dual-purpose machine 1, a reduction process of 97.79% is performed in the sub-scanning direction.

FIG. 1(b) shows an example of transmission from group 3 machine 3 to group 3/group 4 dual-purpose machine 1.

Regarding the main scanning direction, for example, it is necessary to convert the reading resolution of 8 pixels/feet to 200 pixels/¥ (20 pixels/25.4 m), etc. To obtain an image of (178)/(25 m), etc. ,4/200)-250/254(
-98,43%) ...(6), group 3/
98 in the main scanning direction when recording with one group 4 dual-purpose machine
．． Performs 43% reduction processing.

Furthermore, in the sub-scanning direction, the resolution of 7.7 lines/- is directly transmitted at 7.7 lines/degree, so the same size is sufficient.

In this manner, it can be seen that according to the method of this embodiment, only the reduction process is required as the recording process when receiving from the group machines 3 and 4 machines.

In conventional equipment configurations, the three machines in the group are generally millimeter-based in both the main scanning and sub-scanning directions, and the four machines in the group are in inch-based in both the main scanning and sub-scanning directions, so it is difficult to use machines in different groups. When mutual communication is performed by matching facsimile communication procedures, recording processing requires enlargement processing and reduction processing, but according to the configuration of this apparatus, only reduction processing is required, so enlargement processing is no longer necessary.

That is, the memory required for enlargement processing is no longer necessary, and the interpolation processing circuit is also no longer necessary.

Furthermore, image quality deterioration due to enlargement processing no longer occurs.

Note that if the recording unit has the configuration according to the present invention and the reading unit has the same configuration in the inch system in the main scanning direction and the millimeter system in the sub-scanning direction, the exchange of images between such devices will be at the same magnification (without processing). Needless to say, it is possible to do it without doing it.

In addition, in the reduction processing of the present invention, the simplest method is to skip pixels according to the reduction ratio, but the information of the skipped pixels is included in the information of adjacent pixels and left. The image quality may be improved by minimizing omissions.

Alternatively, surrounding correlations may be obtained by adding weights instead of using average values.

Furthermore, although the present embodiment has been described using facsimile communication as an example, the present invention can also be applied to copying operations of facsimile machines and digital copying machines.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to realize mutual communication between a group of machines only by reduction processing and the same magnification, and compared to the conventional example in which enlargement processing and reduction processing are required. No memory is required for processing m, the processing circuit is simplified, and image quality deterioration due to enlargement processing is also eliminated.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a connection example of a device according to an embodiment of the present invention, FIG. 2 is a block diagram showing the device configuration for reducing and enlarging an image signal, and FIG. 3 is a diagram showing a conventional device configuration. FIG. 3 is a diagram illustrating an example of device connections between group 3 machines and group 4 machines. 1...Group 3/Group 4 combined use aircraft, 2...Group 4a13...Group 3 aircraft.゛Roof°3/ Gel-73/ Figure 2 Figure 1

Claims (1)

[Claims] The specification of the recording unit is set to inch system in the main scanning direction and millimeter system in the sub-scanning direction, and images from a reading unit with the same specifications in both the main scanning direction and the sub-scanning direction. A facsimile system characterized in that when the recording section performs recording based on the signal, reduction processing is performed on the image signal in either the main scanning direction or the sub-scanning direction.