JP2608309B2 - Facsimile machine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facsimile apparatus capable of reading and transmitting a document.

2. Description of the Related Art Conventionally, in a facsimile apparatus that handles images having different resolutions, for example, in communication modes of the G3 standard and the G4 standard, the reading resolution of a document reading device provided is fixed to one, for example, for G3 standard or It only had a reading device of either reading resolution for the G4 standard.

[Problems to be Solved by the Invention] For this reason, in a facsimile apparatus provided with a reader having a G4 reading resolution, when data is transmitted from a telephone line according to a communication control procedure of the G3 standard, the facsimile apparatus does not transmit data. It is necessary to separately provide a device for performing a resolution conversion process on the read information.

On the other hand, in a facsimile device having a reading device having a reading resolution for G3, even when data is transmitted from a circuit network using a G4 standard communication control procedure,
It is necessary to separately provide a device for performing a resolution conversion process on the information read from the reading device.

Generally, when transmitting in the G4 standard, the transmission data is
The resolution is 200 to 400 pixels / 25.4 mm. In the case of the G3 standard, data is transmitted at a resolution of 1728 pixels / 215 mm, and the scanning line density is 3.85 lines / mm (standard) and 7.7 lines / mm.

Therefore, 8 × 7.7 (8 × 3.85) / mm ← → 200 × 200
In order to convert (400 × 400) PPI, etc., dots must be thinned out or inserted periodically, and as a result of these processes, defects such as lines in the image may occur. Was.

In addition, since the resolution of each mode is not a natural integer multiple of each other, it is not possible to simply interpolate the read image data by a factor of 2 or thin it out by a factor of 2, thereby deteriorating image quality and complicating processing. Was to be invited.

[Means for Solving the Problems] The present invention has been made for the purpose of solving the above problems, and has the following configuration as one means for solving the above problems.

A first mode, and a second mode in which the pixel density in the main scanning direction and the sub-scanning direction is not a natural number multiple of the first mode. Selecting means for selecting any one of the following; first controlling means for variably controlling the scanning speed of the reading means in the sub-scanning direction according to the selection by the selecting means; and selecting each scanning line according to the selection by the selecting means. Second control means for variably controlling the number of samplings per unit length.

[Operation] In the above configuration, an original to be transmitted can be read at a pixel density corresponding to the selected mode in both the main scanning direction and the sub-scanning direction, so that complicated data conversion processing is not required and image quality is deteriorated. Can be provided.

Example An example according to the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a block diagram of an embodiment according to the present invention.
In the drawing, reference numeral 1 denotes a control unit for controlling the entire embodiment according to a program stored in the ROM 8, for example, a program shown in FIG. An original reading section 3 for reading transmission information from the set transmission original, and a magnification section 3 for performing magnification processing on data read from the original reading section 2 in accordance with a scaling instruction from the control section 1; No processing (1 × processing)
However, in the case where the magnification is changed to 1/2, for example, the magnification processing is performed here. This is a case where the transmission data quality does not deteriorate at all even if the scaling process is performed.

Reference numeral 4 denotes a compression / decompression unit for performing a known compression / decompression process under the control of the control unit 1, reference numeral 5 denotes a storage unit for storing compressed transmission data from the compression / decompression unit 4, and reference numeral 6 denotes a connection to the G3 network 10. G3 communication control unit for performing facsimile communication in accordance with the known G3 communication standard, 7 is connected to the G4 network 20 and G4 communication control unit for performing facsimile communication in accordance with the known G4 communication standard, 8 A ROM 9 for storing parameters and the like used in the present embodiment in addition to the above-mentioned programs is a ROM 9 for receiving data from the network (10, 20) stored in the storage unit 5 at a density according to the recording density designation from the control unit 1. A printer that prints out data.

The details of the document reading unit 2 will be described below with reference to FIG.

In FIG. 2, reference numeral 21 denotes a control circuit which controls the entire document reading unit 2, receives a reading resolution designation from the control unit 1, and performs control to read a transmission document at a resolution according to the reading resolution designation. Reference numeral 22 denotes a scanning speed control unit, which scans the transmission original at a scanning speed according to the reading resolution specification. Reference numeral 23 schematically shows a mechanical transmission original scanning mechanism. 24 is a light source for illuminating the original surface, 25 is an optical lens for condensing reflected light from the original on the reading sensor portion of the one-dimensional image sensor 26, 26 is a one-dimensional image sensor, 27
Denotes an amplifier; 28, a sampling circuit for changing and reading the reading sampling timing from the one-dimensional image sensor 26 so that the timing is in accordance with the reading resolution designation; and 29, the analog-to-digital conversion of the analog information read from the sampling circuit 28. An A / D conversion unit 30 is an interface unit that controls an interface with the control unit 1 and the scaling unit 3.

In the above configuration, upon receiving the reading resolution designation from the control unit 1, the control circuit 21 determines the original scanning speed according to the designation data and the sampling period from the one-dimensional image sensor 26, and performs the scanning according to the determined data. The speed controller 22 and the sampling circuit 28 are controlled.

In the above configuration, the vertical and horizontal resolutions are as follows.

Number of vertical scanning lines; Nv = (S / T) Number of horizontal dots; Nh = (T / t) where S; Scanning time for a predetermined distance (for one page) T; Scanning time for one time of one-dimensional image sensor t; Sampling period of one-dimensional image sensor To change the above resolution, T and t may be changed in accordance with S. In particular, when the sampling period of the one-dimensional image sensor is changed, the dot intervals change uniformly, so that the read image is less deteriorated.

Therefore, when reading the transmission original data transmitted to the G3 line 10, the original scanning speed (transmission speed for one page) S according to the G3 standard is determined, and the scanning time per one time of the one-dimensional image sensor is determined. T is determined and the sampling period t of the one-dimensional image sensor is determined. Then, the transmission original is read according to the determined time, cycle, and the like.

Similarly, when reading original data to be transmitted to the G4 line 20, the original scanning speed (transmission speed for one page) S according to the G4 standard is determined, and the scanning time per one time of the one-dimensional image sensor is determined. T is determined and the sampling period t of the one-dimensional image sensor is determined. And the determined time,
The transmission original is read according to a cycle or the like.

The transmission control of the present embodiment having the above configuration will be described below with reference to the flowchart of FIG.

When a transmission request is input to the control unit 1, the processing shifts to the processing of FIG.
It is determined whether the request is a transmission request to the G3 network 10 or a transmission request to the G4 network 20 via the G4 communication control unit 7. G3 network
If the request is a transmission request to step S10, the flow advances to step S101 to instruct the document reading unit 2 to read the transmission document at the resolution in the G3 mode and, if necessary, specify the scaling to the scaling unit 3 to perform step S103. Proceed to.

On the other hand, if the request for transmission in the G4 mode is made in step S100, the flow advances to step S102 to instruct the document reading unit 2 to read the transmission document at the resolution in the G4 mode, and to the scaling unit 3 as necessary. The magnification is designated, and the flow advances to step S103.

In this case, the reading resolution by controlling the sampling timing in the scanning speed control unit 22 and the sampling circuit 28 in FIG. 2 is, for example, 8 × 3.85 (8
× 7.7) / mm, and 200 × 200 (400 × 4
00) PPI reading resolution. That is, in each of the modes G3 and G4, the reading resolution is a reading resolution that does not have a relationship of a natural integer multiple to each other.

In step S103, the document reading unit 2 is activated to read one page of the transmitted document. This read data is output to the scaling unit 3
To perform the scaling process in step S104 as needed. As described above, in the present embodiment, only the scaling that does not degrade the quality of the read image data by the scaling process is performed, and specifically, transmission in the G4 mode, for example, in the 1 ×, 2 ×, 1/2 ×, etc. In this case, a character having a reading resolution of 400 × 400 PPI is converted to 200 × 200 PPI.

Subsequently, in step S105, it is checked whether the transmission destination is the G3 network 10 or the G4 network 20, and if the transmission is to the G3 network 10, the control unit 1 proceeds to step S106 and the compression / decompression unit 4 sends the G3 network to the compression / decompression unit 4. Then, it is designated to perform compression in the compression mode for use, and the process proceeds to step S108.

On the other hand, if it is the G4 network 20 in step S105, the flow advances to step S107 to instruct the compression / decompression unit 4 to perform compression in the G4 compression mode. In the next step S108, the compressed data is stored at a predetermined position in the storage unit 3. And step S1
Go to 09.

In step S109, it is checked again whether the transmission destination is the G3 circuit network 10 or the G4 circuit network 20. If the transmission is to the G3 circuit network 10, the process proceeds to step S110, in which the G3 communication control unit 6 is activated and the desired communication is started. A connection is established with the transmission destination, and the transmission data stored in the storage unit is read and transmitted, and the flow advances to step S112.

On the other hand, if the transmission destination is the G4 network 20 in step S109, the flow advances to step S111 to activate the G4 communication control unit 7, connect to the desired transmission destination, and read out the transmission data stored in the storage unit. Then, the process proceeds to step S112. In step S112, it is checked whether or not the next transmission original exists in the original reading section 2. If there is the next transmission original, the process returns to step S103 to execute the transmission processing of the next transmission original.

On the other hand, if there is no original to be transmitted, the series of facsimile transmission processing ends, and the transmission processing ends.

In the above description, the case where there are only two resolutions, the G3 mode and the G4 mode, has been described as an example. However, the present invention is not limited to the above example, and the resolution can be specified according to whether the normal mode is the fine mode. Of course, it can be applied to processing at various resolutions such as different.

These resolution designation inputs may be made by G3 / G4 designation key inputs, or may be configured to register the resolution information of the destination device together with the speed dial in which the transmission destination is stored in advance. .

With the above configuration, for example, when a transmission original is read by a reading apparatus having only one reading resolution,
Although a special resolution conversion device is required, this embodiment does not have these troublesome configurations, and simply controls the sampling timing of the reading device, and does not cause deterioration of the read image.

As described above, according to the present embodiment, even when there are a plurality of processing resolutions of the transmission destination device connected to the line network, troublesome resolution conversion processing of the read information is not required, and the image of the read information is not required. A facsimile apparatus that can transmit transmission data at a desired resolution with simple control without deteriorating quality can be provided.

[Effects of the Invention] As described above, according to the present invention, a document to be transmitted can be read at a pixel density corresponding to the selected mode in both the main scanning direction and the sub-scanning direction, and complicated resolution conversion processing and the like can be performed. It is possible to provide a facsimile apparatus which can eliminate the need for image quality and prevent deterioration of image quality.

[Brief description of the drawings]

FIG. 1 is a block diagram of an embodiment according to the present invention, FIG. 2 is a detailed block diagram of a reading resolution converter of a document reading section of FIG. 1, and FIG. 3 is a transmission control flowchart of the present embodiment. . In the drawing, 1... Control section, 2... Magnification section, 3.
... Compression / decompression section, 5... Storage device, 6... G3 communication control section, 7... G4 communication control section, 8... ROM, 9. Scan speed controller, 23 ...
Mechanical transmission original scanning mechanism, 24 light source, 25 optical lens, 26 one-dimensional image sensor, 27 amplifier, 28
.., A sampling circuit, 29, an A / D converter, and 30 an interface.

Claims (1)

(57) [Claims] A reading means for reading a document to be transmitted by scanning; a first mode and a pixel mode in which the pixel density in the main scanning direction and the sub-scanning direction is not a natural number multiple of the first mode; Selection means for selecting one of the two modes; first control means for variably controlling the scanning speed of the reading means in the sub-scanning direction in accordance with the selection by the selection means; and in accordance with the selection by the selection means A facsimile apparatus comprising: a second control unit that variably controls the number of samplings per unit length of each scanning line.