JPH07288687A - Facsimile equipment - Google Patents

Abstract

PURPOSE:To relieve the load for data processing by providing a binarized data write means to the facsimile equipment and writing binarized threshold data to a corresponding area of a memory so as to set image data at an original read start edge and an end side edge into white level data. CONSTITUTION:In the case of implementing original read coding transmission control, a timing t3 being a count detected by a detection circuit 123 is used to provide an output of a start pulse SP from a counter circuit 121 to a read head 85. Image reading is started while being synchronously with a clock signal CLK from a 1st light receiving element by the head 85 and a start command Si to be fed to a CPU 101 is arisen by the changeover 121 in a timing t1, data transmission from a binarized data latch 126 to a read buffer 104 is started in a timing t3 and data transmission are made till a timing t2. That is, white level data at a start edge and an end edge are written in a binarized threshold level data memory, in which image data are converted into white level data.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facsimile machine, and more particularly to a facsimile machine capable of omitting an edge process for processing image data of a predetermined width portion of both ends of an original as white data. .

[0002]

2. Description of the Related Art Conventionally, in this type of facsimile apparatus,
With a read head composed of a CCD (charge-coupled device) in which a large number of light receiving elements are arranged in a line in the paper width direction of the original,
The original is read line by line, and the image signal is converted into binary image data by comparing the digital image data obtained by A / D conversion with the binary threshold value data. Then, the influence of the irradiation light, the variation in the performance of the light receiving element, which affects the reading performance of the reading head,
In order to compensate for the effect of the white level data, the white level data obtained by executing the white level check in advance is stored in the white level data memory. Transfers white level data for 1728 pixels corresponding to the entire width from the white level data memory to the binarization circuit via the binarization threshold data memory,
The image data of each pixel on each line is converted into binary image data by comparing it with the corresponding binary threshold data.

Here, it is not preferable that shadow lines at both ends of the document appear in the transmitted image, and according to the CCITT recommendation, the image data to be transmitted must start from white data for each line. Therefore, in the conventional facsimile apparatus, 3 for the width of 4 mm on the reading start side of the document is used.
Data processing for forcibly replacing the image data of 2 pixels and 32 pixels of 4 mm width on the reading end side with white data is performed (this is referred to as ear white processing). That is, in the case of a letter size original, the image data of each line is
It is composed of white data of 32 pixels, read image data of 1664 pixels, and white data of 32 pixels.

For example, in Japanese Patent Laid-Open No. 60-257662, a count circuit for counting the number of consecutive white pixels and black pixels when compressing input image data and a count circuit for the count circuit are provided. Described is an image data compression device having a circuit for generating a compression code and a replacement circuit for replacing a black pixel at the beginning of input image data with a white pixel.

[0005]

However, in the above-mentioned conventional facsimile apparatus, in the whitening processing,
Since it is necessary to overwrite “0” white data on the image data of 32 pixels on the reading start end side of the read image data (for example, 1728 pixels) and the image data of 32 pixels on the reading end end side. , Microcomputer CP
There is a problem that the load of U data processing becomes large and the transmission time becomes long. Further, according to the image data compression apparatus described in the above publication, there is a problem that the configuration of the circuit for writing the white data as the image data of the leading pixel of each line becomes complicated. The present invention has been made to solve the above problems, and an object of the present invention is to provide a facsimile apparatus capable of omitting the whitening process through simple data processing.

[0006]

In order to achieve the above object, a facsimile apparatus according to a first aspect of the present invention has a reading head having a plurality of reading elements arranged in a line in a paper width direction of an original, and each reading line has a reading head. A reading means for sequentially reading the original from one end side, a binary threshold data memory for setting and storing binary threshold data for converting image data into binary image data, and a reading means. Read, A /
A binary value for converting the image data into binary image data based on the D-converted image data of each pixel and the binary threshold value data supplied from the binary threshold data memory and corresponding to each pixel. A low-level binarization threshold for converting image data of a predetermined number of pixels on the reading start end side and a predetermined number of pixels on the reading end end side of a document into white data. The binary data writing means for writing the value data into the corresponding area of the binary threshold data memory is provided.

According to another aspect of the present invention, the facsimile apparatus has a reading head having a plurality of reading elements arranged in a line in the paper width direction of the document, and reading means for sequentially reading each line from one end side of the document. And a reading buffer for storing the binarized image data read by the reading means and binarized, and a transmission buffer for storing the encoded image data read from the reading buffer. The transfer start and end timings for each line for transferring the binarized image data read and binarized by the reading means to the read buffer are set to a predetermined number on the reading start end side of the document. Timing setting means for setting to exclude image data of pixels and a predetermined number of pixels on the reading end side, and a predetermined number on the reading start side of the original for each line. As the image data of the pixel, with the addition of white data encoded as image data of a predetermined number of pixels of the read completion end side, in which a white data adding means for adding white data encoded.

[0008]

According to the facsimile apparatus of the present invention having the above-mentioned structure, the reading means has a reading head having a plurality of reading elements arranged in a line in the paper width direction of the original, and each reading line is provided. Read the original in order from one side. Binary threshold data memory stores 2
The binarized threshold value data to be converted into the binarized image data is set and stored. Further, the binarizing means includes image data of each pixel read by the reading means and A / D converted, and binarized threshold data corresponding to each pixel supplied from the binarized threshold data memory. The image data is converted into binary image data based on the. Further, the binarized data writing means sets low-level binarized threshold value data for converting image data of a predetermined number of pixels on the reading start end side and a predetermined number of pixels on the reading end end side of the document to white data. Are written in the corresponding area of the binarized threshold data memory.

Further, in the facsimile apparatus of the second aspect, the reading means has a reading head having a plurality of reading elements arranged in a line in the paper width direction of the document, and the document is read line by line. Read from one end side in order. The reading buffer stores the binarized image data read by the reading means and binarized. The image data read from the reading buffer and coded is stored in the transmission buffer. The timing setting means sets the start and end timings of the transfer for each line for transferring the binarized image data read by the reading means and binarized to the reading buffer by a predetermined number on the reading start end side of the document. The pixel and the image data of a predetermined number of pixels on the reading end side are set to be excluded. The white data adding means, for each line,
Encoded white data is added as image data of a predetermined number of pixels on the reading start end side of the document, and encoded white data is added as image data of a predetermined number of pixels on the reading end end side.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 2, the main body 2 of the facsimile apparatus 1 includes a container-shaped lower cover 3, an upper cover 4 that covers the lower cover 3, and a frame (not shown) disposed inside them. Is equipped with. A handset 5 is attached to the lower cover 3. In the lower cover 3, a recording paper cassette 21 capable of accommodating a large number of recording papers 22 made of standard cut paper is set. In addition to the main body 2, the facsimile device 1 includes a control panel 6, a recording device 20 for recording on a recording paper 22 with a recording head 25 via an ink ribbon 27, and a line for line-feeding the recording paper 22 and the ink ribbon 27. It is provided with a feeding device 30, a document feeding device 50 for feeding a document 51, an image reading device 80 for reading an image of the document 51, a control unit 100 for controlling the facsimile device 1, and the like.

First, the recording device 20, the recording paper cassette 21, and the line feed device 30 will be described with reference to FIG. The recording paper 22 is fed one by one from the recording paper cassette 21 by the paper feed roller 31, and then sent to the recording device 20 by the line feed device 30 to record images such as characters and figures. Line feed device 3
0 is a paper feed roller 31, a paper guide 32, a pair of feed rollers 33, a platen 34, a pair of paper discharge rollers 35, a pair of paper guides 36, and a paper discharge tray 3
8 and the like, and these paper feed roller 31 and feed roller 3
3, the platen 34, and the discharge roller 35 are the LF motor 4
0 (see FIG. 4) is rotationally driven via a gear system (not shown).

The front end of the recording paper 22 sent out from the recording paper cassette 21 is detected by the recording paper front end sensor 24, and the recording start timing of the recording device 20 is determined based on the detection signal. The recording paper size detection sensor 23 is
Of the recording paper cassettes 21 prepared for various recording papers 22 having different sizes, the type of the recording paper cassette 21 installed in the facsimile apparatus 1 is detected, and the size of the recording paper 22 is determined based on the detection result. It is determined.

The recording device 20 is provided in the upper cover 4,
This recording device 20 is a recording head controller 1 shown in FIG.
Recording head 25 controlled by 8 and recording head 25
A platen 34 rotatably provided at a position facing the
And an ink ribbon cassette 26. The recording head 25 is composed of a thermal head having a large number of heating elements arranged in a line in a direction orthogonal to the feeding direction of the recording paper 22, and a large number of heating elements are selected based on a signal supplied to the recording head controller 18. Be heated. Platen 3
The LF motor 40 is driven to rotate about the center line by a LF motor 40 through a gear system (not shown) to line feed the recording paper 22 and the ink ribbon 27. The ink ribbon cassette 26 has a heat-sensitive ink ribbon 27 having a width corresponding to the recording range of the recording head 25.
The recording head 2 is supplied from the supply side ribbon roll 27a.
The take-up shaft 27b is wound up between the plate 5 and the platen 34, and the take-up shaft 27b is rotationally driven by the LF motor 40 in the take-up direction via a gear system. The ink ribbon 27 is line-fed in synchronism with the recording paper 22, but an image is formed on the recording paper 22 by feeding the ink ribbon 27 and the recording paper 22 and pressing the ink ribbon 27 onto the recording paper 22 by the recording head 25. Will be recorded.

The recording paper 22 on which an image is recorded is guided by a paper guide 36 and sent to a paper discharge tray 38,
It is discharged to the outside of the device. The recording paper discharge sensor 37 detects the discharge of the recording paper 22, and when recording is continuously performed on a plurality of sheets, it is detected by the recording paper discharge sensor 37 that the recording paper 22 on which the image is recorded is completely discharged. Then, the control unit 100, which will be described later, controls the line feed device 30 so that the feeding of the next recording paper 22 from the recording paper cassette 21 is started, thereby avoiding the paper jam.

Next, the document feeding device 50 and the image reading device 80 will be described with reference to FIG. Inside the upper cover 4, a document feeding device 50 and an image reading device 80 for reading an image recorded on the document 51 are provided.
The original 51 is placed on an original receiver 52 which is detachably attached to the upper cover 4, and is set between a pair of original guides 53 shown in FIG.
Detected by the pair of feed rollers 55,
The document is fed to the document reading position of the image reading device 80 by a document feeding device 50 including a paper guide 56 and a pair of feed rollers 57. The document sensor 54 detects the presence / absence of a document, and detects whether a document of B4 size (B4 document),
A4 size manuscript and letter size manuscript (A4 manuscript)
It is composed of two sensors that detect whether or not. The rollers 55 and 57 are rotationally driven by a document feeding motor 60 (see FIG. 4) via a gear system. The document feeding motor 60 is drive-controlled by the control unit 100.

The image reading device 80 includes a light source 81 as a light emitting body, a lens 82, mirrors 83 and 84, a reading head 85 composed of a CCD (charge coupled device) including a plurality of light receiving elements, and the like. The light source 81 irradiates the document 51 with light, and the light reflected from the document 51 is condensed by the lens 82, reflected by the mirrors 83 and 84, and then received by the reading head 85 to form an image on the document 51. It is read line by line. A pixel is a minimum unit that constitutes an image, and is an area (area) on the document 51 that is read by one light receiving element.

The size of one pixel is determined by various factors such as the size of the light receiving element, the positions and angles of the mirrors 83 and 84, the position of the lens 82 and the focal length.
, The size in the main scanning direction is 0.13 mm
The size in the sub-scanning direction is determined by the feed amount of the document 51 while the image reading device 80 reads one line of the image. In this facsimile device 1, the feed amount of the document 51 is 0.26 mm,
0.13 mm and 0.065 mm are selectable, and the size (area) of one pixel when each of these feed amounts is selected is 0.13 mm × 0.26 mm,
0.13 mm x 0.13 mm, 0.13 mm x 0.06
It becomes 5 mm. As the feed amount becomes smaller, the area of one pixel becomes smaller and the resolution becomes higher.

The light receiving element of the read head 85 is a photoelectric conversion element that outputs a voltage according to the intensity of the received reflected light, and an analog image signal representing the magnitude of this output voltage is supplied to the control unit 100. Binary image data is created from the image signal. In this facsimile apparatus 1 capable of reading a B4 size document, the reading head 85 is composed of 2500 light receiving elements arranged in a line in the paper width direction of the document 51. The leading edge of the document 51 is detected by the document leading edge sensor 58, the reading of the document 51 is started after the detection signal is input, and after the reading, the document 51 is discharged from the opening 59 to the outside.

As shown in FIG. 3, an operation panel 6 is provided on the upper cover 4, a liquid crystal display 7 is provided at a rear portion of the operation panel 6, and a keyboard 8 is provided at a front portion and a central portion of the operation panel 6. Is provided. Numeric keypad 9 is on the left side of the keyboard 8, and copy key 10 and start key 11 are on the right side.
However, various keys such as a memory key 12, a function key 13, a set key 14, cursor keys 15 and 16 are provided in the central portion. The copy key 10 is a key for instructing copying of a document and also for initiating copying, and the start key 11 is a key for instructing the start of various processing operations. The function key 13 is a key for instructing display disclosure of various functions that can be executed, and the function is selected by operating the ten-key 9 or the cursor keys 15 and 16. The set key 14 is a key for instructing selection confirmation, and the memory key 12 is a key for instructing selection of memory transmission.

Next, the control system of the facsimile apparatus 1 will be described with reference to FIGS. As shown in FIG. 4, a control unit 100 for controlling the facsimile apparatus 1
Is a communication line 15 connected to the partner device 16, an operation panel 6, a display controller 17 for controlling the display 7, a recording head controller 18 for controlling the recording head 25, the various sensors and switches, a light source 81, and a reading device. Head 85, LF motor 40, document feeding motor 6
They are connected to 0 respectively. As shown in FIG. 5, the control unit 100 includes a CPU 101 and a facsimile device 1.
ROM 10 storing a plurality of control programs for controlling
A microcomputer including the RAM 2 and the RAM 103 is provided.

In the ROM 102, original reading code transmission control is performed in which image data read from the original 51 and binarized is stored in the reading buffer 104, and the image data is converted into encoded compressed image data and transmitted. Of the control program and the compressed image data received from the partner device 16 via the communication line 15 and temporarily stored in the reception buffer 106, and is converted into image data to be recorded in the recording buffer 1.
07, and a control program for receiving and decoding recording control for storing and outputting the image data on the recording paper 22 via the recording device 20.

The RAM 102 has an image reading device 8
A read buffer 104 for reading 0 and storing binarized image data, and a transmission buffer 10 for temporarily storing encoded compressed image data for transmission via the communication line 15.
5, a receiving buffer 106 for temporarily storing the compressed image data received via the communication line 15, a recording buffer 107 for temporarily storing the image data obtained by decoding the received compressed image data, into 2500 pixels White level data memory 108 in which the white level data obtained by the white level setting processing, which is the binarized threshold value data for setting the corresponding white level (this is called white level data), is stored. A memory area such as a threshold data memory 109 for storing binarized threshold data corresponding to 2500 pixels transferred from the memory 108 is provided.

The microcomputer 11 includes a bus 11
0, a gate array 111, a drive circuit 113 for the light source 81, a drive circuit 114 for the LF motor 40,
A drive circuit 115 for the document feeding motor 60, a communication control circuit 116 (which includes a modem) connected to the communication line 15, and the like are connected. Furthermore, the control unit 10
A clock signal generation circuit 112 for generating a clock signal of a predetermined high frequency is also provided at 0, and the clock signal CLK generated by this clock signal generation circuit 112 is output to the read head 85 and the gate array 111, respectively. . In FIG. 5, circuits and devices not directly related to the present invention are omitted.

Next, the gate array 111 will be described with reference to FIG. As shown in FIG. 6, the gate array 111 includes a read head 85 and a start pulse SP.
Is output, and the start / end command Si is sent to the CPU 101.
1 from the transfer gate 120 of the read head 85 in synchronization with the clock signal CLK.
An A / D converter 122 for A / D converting an image signal output for each pixel, and binarized threshold data supplied from the CPU 101 for each pixel are latched, and the binarized threshold data is clocked. Binarization threshold value data latch 124 output in synchronization with signal CLK, digital image data output from A / D converter 122, and binarization threshold value threshold value supplied from binarization threshold value data latch 124 A binarization circuit 123 for converting digital image data into binarized image data (hereinafter, referred to as image data) pixel by pixel by comparing with the data, and a binarization circuit 123.
Shift register 125 for converting serial image data supplied from the device into parallel image data for each byte and outputting the parallel image data, and 1 output from the shift register 125.
A binary data latch 126 for latching the image data for each byte and outputting it to the CPU 101 via the bus 110 is provided.

Next, the counter circuit 121 will be described with reference to FIG. The facsimile machine 1 will be described as an A4 original-only machine for reading only A4 and letter-sized A4 originals. The paper width of the A4 original corresponds to 1728 pixels (1728 light receiving elements), and each line of the A4 original can be read while counting the clock signal from “0” to “1727” (see FIG. 12). As shown in FIG. 7, the counter circuit 1
Reference numeral 21 denotes a counter 130 that receives the clock signal CLK from the clock signal generation circuit 112 and counts from “0” to “2499”; a “0” detection detection circuit 131;
“1727” detection detection circuit 132, “2451” detection detection circuit 133, Si signal generation circuit 134, S
It is composed of a P signal generation circuit 135 and the like.

The detection circuits 131, 132, 133 are connected to the counter 130 by buses, and the detection circuits 131, 132, 133 are connected to the counter 130.
When the count values of "0", "1727", and "2451" are respectively output, one pulse signal is output. The outputs of the detection circuits 131 and 132 are the Si signal generation circuit 134.
Is being supplied to. The Si signal generation circuit 134 is composed of, for example, a flip-flop, and as shown in FIG.
It rises at the timing t1 corresponding to the count value "0", and the timing t2 corresponding to the count value "1727".
A start / end instruction Si (this is a signal for instructing start and end of transfer of image data)
Output to 01.

The output of the detection circuit 133 is supplied to the SP signal generation circuit 135. This SP signal generation circuit 13
Reference numeral 5 is a mere conductor wire that outputs the pulse signal supplied from the detection circuit 133 as it is or a pulse generator that outputs the pulse signal when the pulse signal is received from the detection circuit 133. As shown in FIG. At the timing t3 corresponding to
A start pulse SP for instructing the reading head 85 to start reading is supplied from 5.

Next, an outline of the document reading coded transmission control will be described with reference to FIG. As shown in FIG. 8, the 32 pixels at the reading start end side of the A4 document are omitted so that the ear whitening process of using the 32 pixels at the reading start end and the 32 pixels at the reading end end as white data can be omitted. The binarization thresholds of a pixel and a plurality of pixels preceding them are forcibly set to a sufficiently low low level binarization threshold, and
The binarization threshold values corresponding to the 32 pixels on the reading end side of the A4 original and a plurality of pixels subsequent thereto are forcibly set to a sufficiently low low level binarization threshold value. However, A
The binarization threshold value transferred from the white level data memory 108 is applied as the binarization threshold value of 32 pixels on the reading start end side of the four originals and 1664 pixels on the central side other than the 32 pixels on the reading end end side. It shall be.

Next, with reference to the flow charts of FIGS. 9 to 11 and FIG. 12, the original reading coded transmission control in the facsimile apparatus 1 thus constructed will be described. The control is started every time an A4 original is set in the facsimile apparatus 1, and the reading start preparation process is first executed (S1). This reading start preparation process will be described with reference to FIG. 10. First, the reading start end side 32
The low-level binarized threshold value data in which the pixel is the white data is 3 at the reading start end side of the threshold value data memory 109.
Is set to the memory cell corresponding to two pixels (S20),
Next, the binarized threshold value data for the next 1664 pixels of the 32 pixels on the reading start end side is transferred from the white level data memory 108, and 1 of the threshold value data memory 109 is transferred.
It is set in the memory cell corresponding to 664 pixels (S2
1) Next, low-level binarized threshold data in which 32 pixels on the read end side are white data is set in the memory cells corresponding to the 32 pixels on the read end side of the threshold data memory 109. (S22), and then returns to S2 in FIG. The low-level binarization threshold value data is a constant stored in advance in the control program.

Next, in S2 of FIG. 9, when the start pulse SP is supplied from the gate array 111 to the read head 85, reading is sequentially started from the first CCD. Then, at the rising timing t1 of the start / end command Si, the image data transfer for transferring the image data from the binarized data latch 126 to the reading buffer 104 is started. Next, binarized data latch 12 for each byte
The image data is transferred from 6 to the read buffer 104 (S3), and then it is determined whether the transfer of the image data of one line (pixel data of 1728 pixels) is completed (S3).
4) When the transfer of the image data of one line is not completed, S3 and S4 are repeatedly executed, the transfer of the image data of one line is completed, and the start / end command Si falls at the timing t2 (S4: Yes), an encoding process for encoding the transferred one-line image data is executed (S5). Next, the encoded one-line image data is transmitted and output via the communication control device 116 (S6).

Next, it is judged whether or not the document is finished, that is, whether or not the reading of the document is finished (S7), and if the reading is not finished (S7: No), S2 to S7.
Is repeatedly executed, and when reading is completed (S7: Yes
), It is determined in S8 based on the detection signal of the document sensor 54 whether or not there is a next document, and if there is a next document (S8: Yes), S1 to S8 are repeatedly executed, and when the next document disappears ( S8: No), the reading is stopped (S8
9) Then, the original reading / coding transmission control ends.

Next, the read 1-line end interrupt process executed every time 1 line is read will be described with reference to FIG. 11. First, the read buffer pointer in the read buffer 104 is updated (S30), and then ,
In order to feed the original by one line, the original feeding motor 60 is line-fed by one line (S31), and then the threshold data memory 109 outputs the binarized threshold data latch 1
The threshold value data transfer for transferring the binarized threshold value data to 24 for each pixel is started (S32), and this interrupt processing is ended. The threshold data transfer is executed in parallel with the routine of FIG. 9 from timing t1 to timing t2.

Next, the operation of the original reading / coding transmission control will be described. First, as shown in FIG. 12, when reading each line, at the timing t3 of the count value “2451” detected by the detection circuit 133, the counter circuit 121 sends the start pulse S to the read head 85.
When P is output, reading is started from the first light receiving element of the reading head 85 in order in synchronization with the clock signal CLK, but from the timing t3, the timing t1 corresponding to the count value "0". The image data read during the period is not transferred to the reading buffer 104.

Timing t1 is a timing corresponding to the edge of the A4 original on the reading start side. At this timing t1, the counter circuit 121 causes the CPU 101 to read.
Since the start / end command Si supplied to the rising edge rises, the transmission of the image data from the binarized data latch 126 to the reading buffer 104 is started at this timing t3, and the transfer of this image data is performed with the count value “1727”.
The image data for 1728 pixels is transferred until the timing t2 corresponding to. And then
At the timing t3, the next line read cycle starts.

Here, as described with reference to FIG. 10, the binarization threshold value for binarizing the 32 pixels on the reading start end side of the document and the 32 pixels on the reading end end side of the document are binarized. The binarization threshold value is set to a low level binarization threshold value, and in the binarization step of binarizing the digital image data, 32 pixels on the reading start end side and 32 pixels on the reading end end side are set. Since the image data is white data, the ear whitening process can be omitted. That is, the low-level binarization threshold data for converting the image data of the 32 pixels on the reading start end side and the 32 pixels on the reading end end side of the original 51 into white data is stored in the binarization threshold data memory 109. By simple data processing of writing in the corresponding memory cell, the image data of 32 pixels on the reading start end side and 32 pixels on the reading end end side of the document 51 can be made white data for each line.

In the conventional ear white processing, it is necessary to perform data processing for each image data of each line, but according to the original reading / coding transmission control of this embodiment, the low level binarization threshold data is set to 2 The process of writing to the corresponding memory cell of the binarized threshold value data memory 109 does not have to be executed every time when the image data of each line is read, but is set to 1 per original.
Since it is executed only once, the load of data processing can be remarkably reduced, and the reading and transmitting time of the original can be remarkably shortened.

Further, in the conventional facsimile apparatus, the counter circuit 121 is not provided, and the timing t1,
Since t2 was determined by counting the image data by the CPU 101, the data count load was large, but since the counter circuit 121 is provided in this facsimile apparatus, the timing t1 and t2 are determined. The load of data processing can also be significantly reduced.

Next, a description will be given of a modification mode in which the above embodiment is partially modified. 1] The 32 pixels on the reading start end side and the reading end end side are merely examples, and the number of pixels such as 4 pixels, 8 pixels, or 16 pixels may be set. 2] The A / D converter 122 is omitted, and instead, a D / A converter for D / A converting the binarized threshold data is provided, and an analog image signal and a binary signal are provided in the binarization circuit 123. The binarized image data may be generated by comparing the binarized threshold signals. 3] The count circuit 121 may be omitted, and a count process of counting clock signals may be executed by a microcomputer. Furthermore, in the case of a facsimile apparatus that reads A4 originals and B4 originals, the counter circuit 121 reads A4 originals and B
4 Start / end commands S that are suitable for reading four originals
i and a start pulse SP are generated.

Next, another embodiment in which the above embodiment is partially modified will be described. In this embodiment, by changing the original reading start timing t3 and the image data transfer end timing t2 as follows, the image data of 32 pixels on the original reading start side and the 32 pixels on the reading end side are changed. Only the image data of 1664 pixels on the center side of the document is read without transferring the image data of pixels.
It is configured so that the data is transferred to 4
As the image data of 2 pixels and 32 pixels on the end side,
The encoded white data is added when the image data is encoded and transferred to the transmission buffer 105. In the control unit 100, instead of the counter circuit 121 of the gate array 111, the counter circuit 1 shown in FIG.
21A is provided.

The counter circuit 121A includes a "0" detection detection circuit 131, a "1663" detection detection circuit 132A for detecting the count value "1663", and Si signals connected to the detection circuits 131 and 132A. The generation circuit 134, the SP value setting device 136 that sets one SP value that sets the generation timing of the start pulse SP, and the SP value data latch 137 that latches the data of the SP value set by this SP value setting device 136. And the counter 130
An “SP value” detection circuit 133A for outputting one pulse signal each time the count value of the SP value becomes the SP value supplied from the SP value data latch 137, and an SP signal generation circuit 135 are provided. . And SP value setter 1
For example, “2419” is set as the SP value via 36.

The detection circuits 131, 132A, 133A
Is connected to the counter 130 by a bus, and as shown in FIG. 16, the start / end command Si output from the Si signal generation circuit 134 to the CPU 101 rises at the timing t1 of the count value “0” and the count value “1663”. At timing t2. Further, the SP signal generation circuit 135 starts the start pulse SP to the read head 85 at the timing t3 of the count value “2419”.
Is output.

Next, the original reading coded transmission control will be described with reference to the flowchart of FIG. However, since this control is different from the flowchart of FIG. 9 only in S54, S55, and S56, only these steps will be described. First, S1 to S in FIG.
Similar to step 4, S50 to S53 are executed and the image data of one line (this is the timing t as shown in FIG. 16).
When the transfer of the image data of 1664 pixels read from 1 to the timing t2 is completed (S53: Yes)
), The encoded white data is added to the corresponding memory cell of the transmission buffer 105 and stored as image data of 32 pixels on the reading start end side of the original in S54, and then in S55, the binary data latch is performed. An encoding process for encoding the read image data of 1664 pixels transferred from 126 to the read buffer 104 is executed, the encoded compressed image data is transferred to the transmission buffer 105, and the encoded white data is converted into the encoded white data. It is stored in the subsequent area.

Next, in S56, the encoded white data is added to the memory cell subsequent to the compressed image data in the transmission buffer 105 and stored as the pixel data of the 32 pixels on the reading end side of the document. It Then S5
Steps 7 and subsequent steps are executed in the same manner as S7 to S9 in FIG. The reading start processing of S50 will be described with reference to FIG. 15. The binarized threshold value data for the central portion of 1664 pixels excluding the reading start end side 32 pixels and the reading end side 32 pixels is white level data. The data is transferred from the memory 108 to the corresponding 1664 memory cells of the threshold data memory 109, is set, and then returns.

Next, the operation of this document reading / encoding transmission control will be described. As shown in FIG. 16, at the timing t3 corresponding to the count value “2419” set via the SP value setting unit 136, the counter circuit 121A
When a start pulse SP is output from the reading head 85 to the reading head 85, the reading head 85 starts reading, but the image data between the timing t3 and the timing t1, that is, the image data of 32 pixels on the reading start end side of the A4 document. Are not transferred to the read buffer 104. Then, at timing t1, the counter circuit 121A causes the CPU 1
When the start / end command Si output to 01 rises, the transfer of the image data of 1664 pixels after the 33rd pixel on the reading start end side is started, and the image data of 1664 pixels is transferred between the timing t1 and the timing t2. The transfer is executed, and at timing t2, the transfer of the image data ends. Then, at the timing t3 corresponding to the count value "2419", the cycle of reading the next one line is started.

As described above, when the document 51 is read,
Timing t of start and end of transfer of each line for transferring the binarized image data that has been binarized to the reading buffer 104.
Since 1 and t2 are set so as to exclude the image data of 32 pixels on the reading start end side and 32 pixels on the reading end end side of the document, the amount of data transfer for transferring the image data to the reading buffer 104 is significantly reduced. Because you can, CPU
The data processing load for data transfer in 101 can be significantly reduced.

In addition, when the image data is encoded for each line, the encoded white data is added as the image data of 32 pixels on the reading start end side of the document 51, and the image data is encoded on the reading end end side 32. Since the encoded white data is added as the image data of the pixels, the image data of the 32 pixels at the reading start end side and the 32 pixels at the reading end end side of the document 51 can be reliably set to the white data. Moreover, in this case, since the encoded white data is written, the data processing time for this data writing is less than or equal to the data processing time in the conventional ear white processing. Therefore, at least the amount of data transferred to the reading buffer 104 can be significantly reduced, so that the load of data processing can be reduced and the reading and transmitting time of the document 51 can be shortened. Further, the counter circuit 121A has an SP
Since the value setter 136 and the SP value data latch 137 are provided, the timing t3 at which the count value becomes the SP value can be appropriately set through them, which is excellent in versatility.

A modified mode in which the above embodiment is partially modified will be described. 1] The 32 pixels on the read start end side and the read end end side are merely examples, and the number of pixels such as 8 pixels or 16 pixels may be set. 2] The SP value setter 136 and the SP value data latch 137 in the counter circuit 121A of the gate array are omitted, and the “SP value” detection detection circuit 133A is configured as a detection circuit that detects the count value “2419”. May be.

[0048]

As described above in detail, according to the facsimile apparatus of the first aspect, the binarized data writing means is provided, and the predetermined number of pixels on the reading start end side of the original and the predetermined number of pixels on the reading end end side of the document are set. Through a simple data process of writing low-level binarized threshold value data for converting image data of pixels to white data into a corresponding region of the binarized threshold value data memory, an original document is written line by line. The image data of the predetermined number of pixels on the reading start end side and the predetermined number of pixels on the reading end end can be white data. The process of writing the low-level binarized threshold value data into the corresponding region of the binarized threshold value data memory does not have to be executed every time the image data of each line is read, but is executed only once per document. Since it is not necessary to perform data processing for each image data of each line unlike the conventional ear white processing, the load of data processing is remarkably reduced, and the reading and transmitting time of the original can be remarkably shortened. it can.

According to the second aspect of the present invention, the facsimile is read from the original by the timing setting means.
The start and end timings of transfer of each line for transferring the binarized image data that has been binarized to the reading buffer are determined by a predetermined number of pixels on the reading start end side of the document and a predetermined number of pixels on the reading end end side. Since the image data is set to be excluded, the amount of data to be transferred to the transmission buffer of the image data can be remarkably reduced, so that the data processing load for the data transfer can be remarkably reduced.

Then, the white data adding means adds coded white data as image data of a predetermined number of pixels on the reading start end side of the document for each line.
Encoded white data is added as image data of a predetermined number of pixels on the reading end side, so that image data of a predetermined number of pixels on the reading start end side of the document and a predetermined number of pixels on the reading end side of the document are ensured. Can be set to white data. Moreover, in this case, since the encoded white data is added,
The data processing time for this data addition does not exceed the conventional ear white processing. Therefore, at least the amount of data transferred to the reading buffer can be remarkably reduced, so that the load of data processing can be reduced and the reading and transmitting time of the original can be shortened.

[Brief description of drawings]

FIG. 1 is a perspective view of a facsimile apparatus according to an embodiment of the present invention.

FIG. 2 is a vertical sectional side view of the facsimile device.

FIG. 3 is a plan view of an operation panel of the facsimile device.

FIG. 4 is a block diagram of a control system of the facsimile device.

FIG. 5 is a block diagram of a main part of a control unit of the control system.

FIG. 6 is a block diagram showing a configuration of a gate array of the control unit.

FIG. 7 is a block diagram showing a configuration of a counter circuit of the gate array.

FIG. 8 is an explanatory diagram for explaining an output of a CCD of a reading head, a binarization threshold value, and the like.

FIG. 9 is a flowchart of document reading encoding transmission control.

FIG. 10 is a flowchart of a subroutine of read start preparation processing in FIG.

FIG. 11 is a flowchart of read 1-line end interrupt processing.

FIG. 12 is a time chart of image data, a start / end command, a start pulse, and the like.

FIG. 13 is a block diagram showing a configuration of a counter circuit according to another embodiment.

FIG. 14 is a flowchart of document reading coded transmission control according to another embodiment.

FIG. 15 is a flowchart of a subroutine of read start preparation processing in FIG.

FIG. 16 is a time chart of image data, a start / end command, a start pulse, etc. according to another embodiment.

[Explanation of symbols]

 1 Facsimile device 80 Original reading device 85 Reading head 100 Control unit 101 CPU 102 ROM 103 RAM 104 Reading buffer 105 Transmission buffer 109 Threshold data memory 111 Gate array 121, 121A Counter circuit

Claims (2)

[Claims] 1. A reading head having a plurality of reading elements arranged in a line in a paper width direction of a document, reading means for sequentially reading from one end of the document for each line, and binarizing image data. A binarized threshold value data memory for setting and storing binarized threshold value data to be converted into image data; image data of each pixel read by the reading means and A / D converted; A facsimile apparatus comprising a binarizing means for converting image data into binarized image data based on binarized threshold data supplied from a binarized threshold data memory and corresponding to each pixel, Corresponding low level binarization threshold data for converting the image data of a predetermined number of pixels on the reading start end side and a predetermined number of pixels on the reading end end side to white data in the binarization threshold value data memory. Do A facsimile machine comprising a binary data writing means for writing in an area. 2. A reading head having a plurality of reading elements arranged in a line in the paper width direction of the original, and reading means for sequentially reading from one end side of the original for each line, and the reading means. In a facsimile apparatus including a read buffer for storing binarized image data binarized by the read buffer and a transmission buffer for storing encoded image data read from the read buffer, the reading unit reads the read data. The transfer start and end timings of each line for transferring the binarized binary image data to the reading buffer are determined by a predetermined number of pixels on the reading start end side of the document and a predetermined number of pixels on the reading end end side. Timing setting means for setting so as to exclude image data of pixels, and as image data of a predetermined number of pixels on the reading start end side of the document for each line. With the addition of white data encoded as image data of a predetermined number of pixels of the read completion end side, the facsimile apparatus characterized by comprising: a white data adding means for adding white data encoded, the.