JPH0376379A - Facsimile equipment - Google Patents

Abstract

PURPOSE:To improve efficiency for using the configuration of a facsimile equipment and to make the equipment compact by using a shift register, which is provided for printing an original, as a memory for the work of signal processing to picture data required when the picture of the original is read. CONSTITUTION:The picture data applied from a telephone line T are demodulated by a transmission control circuit 30, decoded by a control circuit 28 and outputted to a changeover switch 33. The picture data are applied from the switch 33 through a terminal Tb of a connector 17 to a shift register S. The picture data are successively shifted by a serial clock pulse to bo applied from the circuit 28 through a terminal Te of the connector 17. When the picture data are printed, respective heat generating elements H1-Hn are driven to generate heat based on the data of corresponding cells S1-Sn. Relatively to signal processing in reading operation, the data are successively applied from the cell Sn of the shift register S through a terminal Ta of the connector 17 to a signal processing circuit 26.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a facsimile device that performs communication using a communication system standardized by, for example, CCIT (International Telegraph and Telephone Consultative Committee).

Conventional Technology In recent years, facsimile machines have become popular in homes, and there is a strong demand for their miniaturization and cost reduction.Therefore, facsimile machines are designed to simplify their configuration and reduce the number of parts to meet the above demands. It is necessary to respond to

On the other hand, in order to communicate image data between different types of facsimile machines, facsimile machines use, for example, CCI.
It is necessary to communicate image data according to the communication method standardized by TT.

In the communication system called GL [standardized by CCIT, it is called standard mode! 5.9
There are two communication modes: a communication mode for high-definition image data, and a mode called a fine mode that enables communication of high-definition image data. For example, as shown in FIG. 8 (1), when there is a line 14 on the original 52, the original 52 is conveyed in the direction of the arrow 53, and the one-dimensional close contact line arranged in the horizontal direction as shown in FIG. The document image is read by a reading means such as a shape image sensor.At this time, in the standard mode, an area having a width L1 is defined as one line, and a reading operation is sequentially performed line by line.

That is, in the order of lines 13, 12.11, each line 4
Reading 51! l f? ' will be done.

The printing mode of the image data read in this way is shown in FIG. 8(2). In FIG. 8, pixels for printing are indicated by diagonally shaded areas. In line 13, in the pixel on the left side of Figure 8 <2>, line 14 extends in the horizontal direction in Figure 8 in this area, and is a thin line, so the threshold level at the time of image reading is low and non-standard. It is considered to be printed. Also, line 14, line 1 l, 1
In the pixel near f that intersects the boundary between question 2 and line 12. Then, as shown in FIG. 8(2), the line 14 is divided and the image data thereof is communicated.

FIG. 8(3) is a diagram for explaining the document reading operation in the fine mode. 8th ['ff1(1>
When the original 52 shown in 1 is read in the fine mode, the reading operation is performed with an area of the original 52 having a width L2 that is 1/2 of the width Ll as one line. namely lines 13b, l 3a.

(The reading operation of each line is performed in the order of 12b, l 2a, 1 lb, and 11a, and the print Ra! based on the read image data is relatively similar to the original 52 as shown in FIG. 8(3). In this case, the threshold level when reading the image is the level for the width L2, so even if a relatively thin horizontal line is read, it will not be determined as non-printing.

Therefore, when reading an image in the standard mode, there is a problem that, for example, when transmitting an image in which thin lines exist in the horizontal direction on the original 52, the horizontal lines disappear.

A conventional technique that solves rMM in such a standard mode is shown in FIG.

The facsimile device 1 includes a reading section 3 for reading an image of a document, a recording section 2 for printing the image on recording paper,
It is configured to include a transmission control unit 10 that controls line connections, etc., an operation panel 9 that is provided with a group of numeric keys, etc., and a friitn circuit 8 that performs encoding and decoding of iii image data, etc. The facsimile device 1 has a telephone connection circuit 1 in the transmission I11 control circuit 10 in order to realize the telephone function.
1311 tj, handset 12, etc. are connected.

A case in which the facsimile device 1 reads and transmits a document image in the am standard mode will be described below. The reading unit 3 includes a reading device 4 such as a one-dimensional contact image sensor, and an analog/digital converter (hereinafter referred to as rA/D).
5, a signal processing circuit 6, and a memory 7, the document image is read by the reading device 4 in lines having the same width L2 as in the fine mode.

The analog signal from the reading device 4 is converted into binary level data by the A/'D converter 5. The signal processing circuit 6 stores one line of image data in the memory 7, and then calculates the difference between the line image data output from the A/D converter 5 and the line image data stored in the memory 7. In step 81 (3), the image data of line 13b is stored in the memory 7, and the image data of line 13a that is sent next is subjected to signal processing such as calculating a logical sum. A logical sum is calculated for each pixel. Therefore, one line of pixel data is output from the signal processing circuit 6 in a two-line read operation in the fine mode. The processing result is output to the IT control circuit 8 as binary data. In the control@path 8, this binary data is coded f and sent to the transmission control circuit 1o.
is modulated by the standard mode communication method.
Sent to AT.

In this way, in the facsimile fit, when transmitting a document image in the standard mode, the document image is read line by line with the width L2, similar to the reading operation in the fine mode. The signal processing in the signal processing circuit 6 is performed by, for example, the eighth
In FIG. 3, a logical sum is calculated for the image data on line /la and line e1b. line 12
a and line 12b, also lines 13a and 13b
Similarly, the logical sum is calculated between the two. Therefore, the print polishing pattern based on the image data subjected to such signal processing is as shown in No. 81 (4). In this way, with the facsimile machine, even if there are thin horizontal lines on the original 52 when transmitting an image in standard mode, the problem such as the thin lines disappearing can be avoided. Image data can be sent.

yN Problems to be Solved by the Invention In the facsimile machine 1 of the prior art, when sending an original image in the standard mode f3, the above-mentioned signal processing is performed on the image data read by the reading device 4. A dedicated memory 7 is required as the fF business storage area. Therefore, there are problems in that this increases the cost and also increases the external size of the device.

Furthermore, when transmitting image data, the telephone line T is connected for the purpose of transmitting image data, and cannot receive image data from other facsimile machines (step 3).
Recording section 2 cannot be used. Therefore, since the recording unit 2 is not operated when image data is to be transmitted, there is a problem in that the configuration is wasted and the efficiency of using the configuration of the facsimile device is deteriorated.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a facsimile machine that solves the above-mentioned technical problems, improves the usage efficiency of the facsimile machine configuration, and is advantageous for cost reduction and miniaturization.

Means for Solving the Problems The present invention provides a facsimile device that is connected to a telephone line and communicates image data, which includes a plurality of printing elements and a cell that individually corresponds to each printing element. A shift register that stores image data for lines, an image reading device that reads the image of the document line by line, and a signal processing device that performs signal processing on the first image data from the image reading device and outputs it as second image data. and a switching means for switching between the first M image data and the third image data from the telephone line and outputting the same to the shift register, and reading the image of the document and reading the image of the document and the third image data from the telephone line. When sending the ii image data to the telephone line, the switching means leads the first image data to the shift register, and the signal processing means outputs the 1i image data to the shift register.
i1. The second image data obtained by performing signal processing on the first image data from the ft reading means, which is the first image data one line before the first image data, with reference to the drawing data given from the shift register. When transmitting image data to a telephone line and printing third image data from the telephone line, the switching means derives this third image data to the shift register and stores it in each cell of the shift register. This facsimile IT is characterized in that printing is performed by driving a corresponding printing element based on the received data.

According to the present invention, when an image of a document is read and the image data is sent to a communication line, the image reading means reads the image of the document line by line and generates the first image data. is output to the signal processing means. The switching means directs the first image data to the shift register. As a result, when the image reading means reads the image of the next line and outputs the image data to the signal processing means, this first image data is stored in the shift register. The signal processing means receives the first image data from the image reading means, and the signal processing means receives the first image data from the shift register one line before the first image data from the shift register. ii perform signal processing with reference to the image data;
The obtained second image data is sent to the telephone line.

Further, when printing third image data from the telephone line, the switching means switches to output the third image data to the shift register.

Therefore, the third image data from the switching means is stored in the shift register, and based on the data in each cell of this shift register, the printing element corresponding to each cell is driven to perform printing.

Therefore, the shift register provided for printing the original can be used as a working memory for signal processing of image data required when reading the image of the original.

Embodiment FIG. 1 shows a facsimile machine 21 which is an embodiment of the present invention.
FIG. 2 is a block diagram showing the configuration of FIG. Facsimile device 21
consists of a reading section 23 for reading images of originals, a recording section 22 for printing images on recording paper, a transmission control section 30 for controlling line connections, etc., an operation panel 29, and an input section for image data. It is configured to include a control circuit 28 that performs image encoding and decoding, and a changeover switch 33, and communicates image data using the Gm communication method.

A case in which the facsimile device 21 reads and transmits a document image will be described below. The reading unit 23 includes a reading device 24 such as a one-dimensional contact image sensor, and an analog/
Digital converter (hereinafter abbreviated as “A/D converter”)
25 and a signal processing circuit 26, the document image is read by the reading device 24 into lines of width Lb, etc. The analog signal from the reader 24 is
The image data A is converted into binary level image data A by the A/D converter 25. In fine mode, the signal processing circuit 26
The control circuit 2 uses this image data A as image data C.
Output to 8. In the standard mode, the signal processing circuit 26 outputs the image data A for each line as image data E to the individual contacts 33a of the changeover switch 33. At this time, the changeover switch 33 brings its individual contact 33r and common contact 33c into conduction. therefore,
Subsequently, signal processing is performed between the line image data A output from the A/D converter 25 and the line image data B stored in the shift register S as described later. The processing result is output as image data C to the control circuit 28. This binary data is encoded in the II control circuit 28, modulated in the transmission control circuit 30, and sent to the telephone line T. Such operations are performed based on key operations such as a group of numeric keys provided on the two operation panels. In addition, in order to realize the telephone function, the transmission control circuit 3
0 is connected to a telephone circuit 31, a handset 32, and the like.

The configuration and printing operation of the recording section 22 will be explained below. The recording unit 22 includes a print head 34 and one pulse motor for conveying recording paper. Image data supplied from the telephone line T is demodulated by a transmission control unit 1930, and decoded (history) by a control circuit 28. The image data from the changeover switch 33 is output to the changeover switch 33. At this time, the changeover switch 33 is switched to a state where the individual contact 33S and the common contact 33c are electrically connected by the control circuit 28. Therefore, the image data from the changeover switch 33 is 17 terminal TLI to the shift register S. The shift register S has cells 81 to Sn that individually correspond to the heating elements 81 to Hn. Therefore, the image data is sent from the control circuit 28 to the connector When printing 0 image data that is sequentially shifted by serial clock pulses applied via the terminal Tc of cell No. 17, each fully-ripe element H1-Hn prints a complete image data based on the data of the corresponding cells 81-Sn. Driven.

When one line of printing is completed, the control circuit 28 drives the pulse motor 49 by one line (width of a fully ripened element) via the drive circuit 48 to convey the recording paper. In standard mode, for example, one line of image data
The printing operation is performed twice, and printing for two lines in fine mode is performed.

In connection with signal processing for a read operation, data from cells S n of the shift register S are sequentially applied to the signal processing circuit 26 via the terminal Ta of the connector 17 . Therefore, this shift register S is also used for the read operation in the standard mode described above.

FIG. 2 is an electric circuit diagram showing the configuration of a signal processing circuit 26a that performs a logical sum of print data between adjacent lines as an example of a signal processing circuit 26 that performs signal processing using a shift register S. FIG. 3 is a time chart for explaining the operation of the signal processing circuit 26a. Note that the electric circuit IBI 21 in FIG. 2 shows a schematic diagram of standard mode communication, and only the standard mode will be described below. The signal processing circuit 26a is
It consists of flip-flops 40 and 41, an inverter 42, and an OR circuit 43. Pulse signal φt having a pulse for every reading movement f1″ for one line in fine mode
is applied to the clock input terminal CK of the flip-flop 40. The pulse signal φt is shown in No. 3121(1).

The output terminal Q and the input terminal of the flip-flop 40 are connected, and the signal PRDY outputted from the flip-flop 40 corresponds to the reading movement f for each line, as shown in FIG. 3(2). It becomes a rectangular wave that repeats high level and low level every time.

The image data A output from the A/D converter 25 is applied to the input terminal of the flip-flop l11 and also to one input terminal of the OR circuit 43. A
The serial clock pulse CLK output from the /D converter 25 is inverted by the inverter 12 and applied to the input terminal CK of the flip-flop 41. Therefore, image data 8 is output from the flip-flop 41 as image data E with a delay of half a cycle of the serial clock pulse.

For example, as the image data A and E, as shown in FIG. 3(3), image data DA2m of the 2mth line in the reading operation is derived in the period WO.

Image data E from the flip-flop 41 is led out to an individual contact 33r of the changeover switch 33.

@As described above, the if image data B outputted from the shift register S via the terminal Ta of the connector 35 is given to the other input terminal of the OR circuit 43. The output of this OR circuit 43 is given to the control circuit 28 as image data C.

Since the image data B is delayed by one line in the shift register S, the 2m-1st image data DA is used as the image data B during the period WO, as shown in FIG. 3 (4).
2m-1 is derived, and in period W1, the second m? One image data C from which the eye image data DA2m is derived is obtained by taking the logical sum between adjacent lines, and is taken in by the control circuit 28 only when the signal PRDY is at a high level.

Furthermore, for example, the logical sum of the signal C and the signal PRDY may be taken and output. Therefore, in the image data C, as shown in the third [21(5), in the period W1, the standard mode The image data D T m of the rnth line in is output.

The operation during period W1 will be described below with reference to time chart ① in FIG. The serial clock pulse CLK from the A/D converter 25 is shown at the first T3(1). Image data A is output from the A/D converter 25 in synchronization with this serial clock pulse CLK.

If the data corresponding to the 11th pixel of the 2m+1st line is expressed as D A 2 rn +1.1, the image data A becomes 0 as shown in FIG. 4 (2), and the image data E becomes 11th:! As shown in 1(5),
From this image data A, serial clock pulse CL K
is delayed by half a cycle. Further, in the period W1, the image data B is the image data of the 2m-th in-line, as shown in FIG. 4(3). This image data B is
Again, it is output synchronously with the serial clock pulse CLK. Since the logical sum circuit 43 calculates the logical sum of the image data A and the image data B, the data of each pixel derived as the image data C is expressed by the following equation.

DTm, i=DA2m, i V DA2 extension +1. ■
In addition, "" in the formula represents a logical sum.

Image data C is as shown in FIG. 4 (4).

Hereinafter, the operation of the standard mode 1 of the facsimile machine 21 at t3 will be explained with reference to the flowchart of FIG. In this facsimile machine 21, when a document is placed in the document stacker and the facsimile number of the destination is entered by pressing the numeric keys provided on the operation panel 28 of the facsimile machine, the telephone line is connected. At the same time, the document is transported. At this time, in step n1, the value of parameter j representing the line number is set to "1".

In step n2!3, it is determined whether the signal PRDY is at a high level. That is, when the signal PRDY becomes high level, the process moves to step n4 and interrupt processing, which will be described later, is performed. If signal 9 p(DY) is at a low level, in step rr3, the control circuit 28 performs processing operations f1, such as code f1 of the image data.

In step n4, the reception of the j-th line image data DTj, which is output as the double data C from the signal processing circuit 26, into the control circuit 28 is started by interrupt processing.

Next, if j3's P YI DY is not at a low level in step n5, other processing operations are performed in step o6. Therefore, at this time, the capture of image data DTj and other processing operations are performed in parallel. In step rr 5 the signal PRDY
When it becomes low level, the capture of the image data DTj is completed in step n7. After this, step n8
At , it is determined whether or not the processing of the auxiliary line has been completed. If the processing of the final line has not been completed, the process moves to step n, where the value of the parameter j is incremented, and the process returns to step n2, where the same operation as described above is repeated. In step rx8, for example, the upstream end of the document in the transport direction is detected, and when the WM group has finished processing the last line of the document to be read, the process moves to step r110, where a predetermined transmission end process is performed, and the telephone line is disconnected. Be cut off. In this way, the transmission IP of the image data of the document is completed.

As described above, in the facsimile device W2t according to the present invention, when reading an image of a document, vJft? is similar to the reading operation in fine mode. I do.

For example, as shown in FIG. 6(1), when there is a line 18 on the original 62, the image of the original 62 is read while being conveyed in the direction indicated by the arrow 63.

At this time, line l5. The area indicated by l 6° 17 and having a width La each indicates an area to be read for one line in the standard mode.In this embodiment, each line is read as shown in FIG. !
5. l 6° 17 is a region 15a having a width Lb,
l 5b : 16a, l 6b ; l 7a, l 7
The data is divided into two parts and read. Thereafter, the signal processing circuit 26 processes, for example, the line 15a and the line 15a.
/l! 5b is logically summed, and based on the output image data, the other party's facsimile machine
Printing is performed as shown in Figure (3).

Therefore, in this embodiment, even if a document has a thin line in a direction perpendicular to the conveying direction of the document, the image data can be transmitted without losing the thin line. Furthermore, since a dedicated memory or the like is not required for such signal processing, it is advantageous for downsizing the facsimile machine and can reduce costs.

DETAILED DESCRIPTION OF THE INVENTION According to the present invention, as described in detail, a shift register provided for printing a document is used as a work memory for signal processing of image data required when reading an image of the document. Therefore, it is possible to improve the usage efficiency of the configuration of the facsimile device, and to realize lower cost and smaller size.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of a facsimile device 21 according to an embodiment of the present invention, FIG. 3 is a time chart for explaining the data of the signal processing circuit 26a, FIG. 4 is a time chart showing each signal in period W1 in FIG. 3, and FIG.
The illustration is in facsimile format! ! 21 is a flowchart for explaining the operation of the control circuit 28, FIG. 6 is a diagram for explaining the original reading operation of the facsimile machine 21, and FIG.
The figure is a block diagram showing the configuration of a conventional facsimile machine 1, and FIG. 8 is a diagram for explaining the image reading operation of the conventional technique. 21...Facsimile device, 22...Recording section, 23
...Reading unit, 24...Reading device, 25...A
/D'R converter, 26...signal processing circuit, 28.
... Control circuit, 29... Operation panel, 30... Transmission control circuit, 33... Changeover switch, A, B, C, E
...Image data, L...Telephone line, S...Shift register, H1-Hn...Heating element

Claims (1)

[Claims] A facsimile device connected to a telephone line and communicating image data, comprising a plurality of printing elements and a cell individually corresponding to each printing element, and storing one line of image data. a shift register for reading an image of a document line by line; a signal processing means for performing signal processing on the first image data from the image reading means and outputting it as second image data; a switching means for switching third image data from a telephone line and outputting the third image data to the shift register; when reading an image of a document and transmitting the image data to the telephone line, the switching means switches the third image data from the telephone line; The image data is led to the shift register, and the signal processing means inputs the image data, which is the first image data one line before the first image data, and which is given from the shift register, to the first image data from the image reading means. When the third image data from the telephone line is to be printed by referencing and subjecting the obtained second image data to a telephone line, the switching means transfers the third image data to the shifted image data. A facsimile machine characterized in that data is output to a register and stored in each cell of the shift register, and a corresponding printing element is driven to perform printing.