JPH09284438A - Facsimile equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a facsimile equipment simultaneously reading both faces of a both-sided original and alternately compressing and transmitting/receiving image data on front and rear sides line by line. SOLUTION: This facsimile equipment reads the front and rear faces of the both-face original 7 by the unit of a line by means of a front face reading part 2 and a rear face reading part 3 to alternately output line by line to a selection part 4. The part 4 alternately outputs image data from the parts 2 and 3 to a compression-encoding part 5, which encodes image data alternately inputted from the part 4 by a prescribed encoding system to transmit to an opposite party through a transmission part. At the time of encoding by a two-dimensional coding system, the part 5 encodes image data by referring to a line before the line before a presently encoding line as a reference line at the time of encoding by an arithmetic encoding system, the part 5 select pixels at every other line as reference pixels concerning lines before the presently encoding line.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facsimile device, and more particularly, to a facsimile device without using a large capacity memory.
The present invention relates to a facsimile device that simultaneously reads both sides of a document and appropriately transmits and records image data.

[0002]

2. Description of the Related Art Conventionally, in an image data transmission apparatus, for example, a facsimile apparatus, as shown in the block diagram of FIG. 10, a facsimile apparatus 50 is controlled by a system control unit 51 and a scanner 52 is used for transmission. The image data of the read original is read by the encoding / decoding unit 53 by M
H (Modified Huffman) coding method, MR (Modufied R)
Eleven element address designate) encoding method, or compression encoding by a standard encoding method for binary facsimile such as MMR (Modified MR) encoding method, and then temporarily storing it in the image memory 54 to establish a communication control unit. The data is output to the line L via 55, the modem 56, and the network control unit 57 to be transmitted to the partner facsimile machine. When receiving, the facsimile device 50 receives the encoded image data sent via the line L by the network control unit 57, the modem 56, and the communication control unit 55 under the control of the system control unit 51. After being temporarily stored in the image memory 54, the encoding / decoding unit 53 decodes the original image data, and the plotter 58 records and outputs the original image data. In FIG. 10, the operation display unit 59 is provided with various operation keys for performing various operations such as a transmission operation and a display for displaying information from the facsimile device 50 to the operator. It is connected.

Such a conventional facsimile machine 50
Usually has only one scanner 52 for image input, and can read only one side of a document. Therefore, in the case of a double-sided document in which information is written on both sides, one side can be read as it is by the scanner 52 and transmitted, but as for the other side, a copy once can be read by the scanner 52. However, it is necessary to turn over the original and cause the scanner 52 to read the original, and then to send the original, which makes it difficult to handle the double-sided original.

Therefore, conventionally, there has been proposed an image data transmission apparatus for reading image information on both sides without making a copy of a double-sided original or turning it over.

As such a device, there is, for example, a double-sided scanning device described in Japanese Patent Laid-Open No. 2-291764, which reads both sides of an original with a line sensor for one line of each line sensor. Is output as one serial output, so that it is output as image data in which the front side and the back side of the original are arranged side by side.

Further, there is a facsimile described in Japanese Patent Application Laid-Open No. 2-124680, in which two image sensors for reading both sides are arranged, and one side is
Transmission is performed while reading, and at the same time, for the other side, the read data is stored in the memory, and when the transmission of one side is completed, the data of the other side is read from the memory and transmitted.

Further, there is a facsimile transmitter described in Japanese Patent Laid-Open No. 64-50665, which reads both sides of a document at the same time and transmits each information on a separate telephone line.

[0008]

However, in such a conventional facsimile apparatus, there is still room for improvement.

That is, in the one disclosed in Japanese Patent Laid-Open No. 2-291764, one line on the front side and one line on the back side are alternately output to output an image as if both sides were lined up. Therefore, if you try to send such an image, it becomes a horizontally long image, the length of the image in the main scanning direction becomes twice the size of the original document, and some processing on the receiving side, for example, There is a problem that the usability is poor because it is necessary to temporarily store the information in a memory and reproduce it before printing.

Further, in the one disclosed in Japanese Patent Application Laid-Open No. 2-124680, both sides of a document are read by an image sensor, image data of one side is transmitted as it is, and image data of the other side is stored in a memory. Since the image data on the other side was sent after the image data on one side was sent, a large-capacity memory was required, which not only increased the price of the facsimile machine but also sent one side for long documents. There is a possibility that the memory will overflow before the end, but there is a problem that the image data of the original document cannot be properly transmitted because the countermeasure when the memory overflows is not taken into consideration. In addition, in this publication,
It is described that the image sensor is arranged to be shifted in the sub-scanning direction to reduce the required memory capacity, and that the memory is not required by shifting the image sensor by one page or more in the sub-scanning direction. However, this idea does not take into consideration long manuscripts, and the normal G3
As a facsimile, there is a problem that it cannot function.

Further, in the one disclosed in Japanese Patent Laid-Open No. 64-50665, both sides of the original are read at the same time and the respective information is transmitted through different telephone lines, so the transmission time is shortened. However, the receiving side must always have the same configuration, and there is a problem in that it is generally impossible to transmit to a general facsimile capable of receiving only one line of information.

Therefore, according to the first aspect of the present invention, a large-capacity storage means is used by alternately extracting image data for each line from the front surface reading means and the back surface reading means, compressing the image data, and transmitting the image data. It is an object of the present invention to provide an inexpensive facsimile apparatus capable of simultaneously reading and transmitting double-sided originals.

According to a second aspect of the present invention, image data is alternately taken out line by line from the front side reading means and the back side reading means, and the image data is compressed and transmitted as it is, or compressed image data depending on the function of the destination. By selecting whether to re-compress each of the front side image data and the back side image data before transmission, the appropriate image data according to the function of the other party can be transmitted, and the two-sided original can be properly transmitted to the other party. It is an object of the present invention to provide a facsimile device capable of recording and outputting an image.

According to the third aspect of the present invention, when the image data is alternately taken out line by line from the front side reading means and the back side reading means and compressed by a predetermined two-dimensional encoding method, the current line currently encoded is displayed. By referring to the image data of the line before the previous line as the reference line, the facsimile can be performed by performing the encoding while referring to the line having the correlation with the current line, appropriately reducing the code amount and shortening the transmission time. Is intended to provide.

According to a fourth aspect of the present invention, when the image data is alternately taken out line by line from the front side reading means and the back side reading means and compression-coded by a predetermined arithmetic coding method, the current line currently coded. For the previous line, by selecting the reference pixel at the time of compression encoding every other line, the encoding is performed while referring to only the correlated pixels, and the code amount is appropriately reduced and the transmission time is shortened. It is an object of the present invention to provide a facsimile device that can be used.

According to a fifth aspect of the present invention, when image data in which front side image data and back side image data of a double-sided original is compressed and encoded line by line is received, the image data is decoded and alternated line by line. Image data of the front side and the back side of a double-sided original are compressed and encoded line by line by reconstructing them as image data of the front side and image data of the back side and recording and outputting them. It is an object of the present invention to provide a facsimile device that can be reproduced and reproduced as a front side image and a back side image.

According to a sixth aspect of the present invention, when image data in which front side image data and back side image data of a double-sided original is compressed and encoded line by line is received, the image data is decoded and alternated line by line. To reconstruct the first image data for one page from the image data for every other line and record and output it, and compress the other image data for every other line again for the second image for one page. After the recording and outputting of the first image data is completed after the data is stored in the storage means, the second image data is again decoded and recorded and output, thereby reducing the memory capacity and reducing the image on the front surface of the double-sided original. An inexpensive facsimile capable of appropriately reproducing image data in which data and image data on the back side are compression-coded line by line and recording and outputting as a front side image and a back side image It is an object of the present invention to provide a location.

According to a seventh aspect of the present invention, the front side image data and the back side image data of a double-sided original are specified by 2 for each line.
When decoding the image data compressed and encoded by the dimensional coding method, by referring to the line before the current decoding line currently being decoded, the decoding is performed while referring to the line having a correlation with the current line. Therefore, it is an object of the present invention to provide a facsimile device capable of appropriately reproducing image data.

According to an eighth aspect of the present invention, when the image data of the front surface and the image data of the rear surface of the double-sided original are compressed and encoded by a predetermined arithmetic encoding method for each line, the present decoding is performed. For the lines before the current decoded line being converted, the reference pixels at the time of decoding are selected every other line, so that the pixels are decoded while referring to only the pixels having correlation, and the image data is reproduced appropriately. It is an object of the present invention to provide a facsimile machine capable of performing the above.

According to a ninth aspect of the present invention, when image data in which the front side image data and the back side image data of a double-sided document are compressed and encoded line by line is received, the image data is decoded and two consecutive lines are received. Minute image data is arranged side by side to reconstruct an image and print it out, so that the front side image data and the back side image data of a double-sided original are printed side by side on one sheet of recording paper, and special storage is performed. An object of the present invention is to provide a facsimile apparatus capable of recording and outputting a front side image and a rear side image with a simple configuration without using any means.

[0021]

According to a first aspect of the present invention, there is provided a facsimile apparatus which performs facsimile communication according to a predetermined facsimile communication procedure by scanning the surface of a document conveyed in the sub-scanning direction in the main scanning direction. A front side reading means for reading an image on the front side of the document, a back side reading means for scanning the back side of the document conveyed in the sub-scanning direction in the main scanning direction to read the image on the back side of the document, and the front side. Data reading means for alternately reading one line of image data from the reading means and the back side reading means;
A compression encoding unit that compresses and encodes the image data extracted by the data extracting unit by a predetermined compression encoding method, and a transmission that transmits the image data compression encoded by the compression encoding unit to a destination. Means and means are provided to achieve the above object.

According to the above arrangement, image data is alternately taken out line by line from the front side reading means and the back side reading means, compressed, and then transmitted, so that a double-sided original can be read without using a large-capacity storage means. It is possible to reduce the cost of a facsimile apparatus that can simultaneously read and send a double-sided original and can appropriately send the double-sided original.

According to a second aspect of the present invention, there is provided a facsimile apparatus which performs facsimile communication according to a predetermined facsimile communication procedure, in which the surface of an original document conveyed in the sub-scanning direction is scanned in the main scanning direction to scan the surface of the original document. Front reading means for reading the image of the original, and back reading means for reading the image on the back of the original by scanning the back of the original conveyed in the sub-scanning direction in the main scanning direction, the front reading and the back reading Data extracting means for alternately extracting image data for one line from the means, compression encoding means for compressing and encoding the image data extracted by the data extracting means by a predetermined compression encoding method, and the compression encoding Storage means for temporarily storing the image data compressed and encoded by the means, and the image temporarily stored in the storage means After decoding the data, the encoding / decoding means for separately re-encoding the image data on the front side and the image data on the back side of the original, and temporarily storing the data in the storage means according to the function of the destination. Selecting means for selecting one of the stored image data and the encoded image data of the encoding / decoding means, and transmitting means for transmitting the image data selected by the selecting means to the other party The above-mentioned object is achieved by including the.

According to the above construction, the image data is alternately taken out line by line from the front side reading means and the back side reading means and either compressed or transmitted as it is or the compressed image data is transferred to the front side depending on the function of the destination. Select whether to re-compress image data and back side image data before sending, and send it, so you can send appropriate image data according to the function of the other party, and properly send the two-sided original to the other party. Images can be recorded and output.

In each of the above cases, for example, as described in claim 3, the compression encoding means compression-encodes the image data by a predetermined two-dimensional encoding method, and at the time of the compression encoding, presently encodes the image data. The preceding line of the current line being converted may be referred to as a reference line.

According to the above arrangement, when the image data is alternately taken out line by line from the front side reading means and the back side reading means and compressed by the predetermined two-dimensional encoding method, the current line which is currently being encoded is located before the current line. Since the image data of a line is referred to as a reference line, even when compression encoding is performed by a two-dimensional encoding method, encoding is performed while referring to a line having a correlation with the current line, and the amount of code is appropriately reduced. Therefore, the transmission time can be shortened.

Further, for example, as described in claim 4, the compression encoding means compression-encodes the image data by a predetermined arithmetic encoding method, and at the time of the compression encoding, it is currently encoded. For the lines before the line, the reference pixels at the time of compression encoding may be selected every other line.

According to the above configuration, when the image data is alternately taken out line by line from the front side reading means and the back side reading means and compression-coded by a predetermined arithmetic coding method, the data before the current line currently being coded is read. As for lines, since reference pixels at the time of compression encoding are selected every other line, even when compression encoding is performed by an arithmetic encoding method,
It is possible to appropriately reduce the code amount by performing the encoding while referring to only the correlated pixels, and it is possible to shorten the transmission time.

According to a fifth aspect of the present invention, there is provided a facsimile device for performing facsimile communication according to a predetermined facsimile communication procedure, the receiving device receiving the encoded image data transmitted from the other party, and the receiving device. Decoding means for decoding the encoded image data received by the means, and the image data decoded by the decoding means are alternately taken out line by line, and the first image data for one page and By providing image reconstructing means for reconstructing as second image data and recording means for recording and outputting an image on recording paper based on the image data reconstructed by the image reconstructing means, the above-mentioned object is achieved. Has been achieved.

According to the above construction, when the image data in which the front side image data and the back side image data of the double-sided original are compressed and encoded line by line is received, the image data is decoded and alternately taken out line by line. , The front side image data and the back side image data are reconstructed and recorded and output. Therefore, the front side image data and the back side image data of a double-sided original can be properly reproduced by compression-encoding the image data line by line. Thus, it is possible to record and output as a front side image and a back side image.

According to a sixth aspect of the present invention, there is provided a facsimile device for performing facsimile communication according to a predetermined facsimile communication procedure, a receiving means for receiving encoded image data transmitted from a destination, and the receiving device. Decoding means for decoding the encoded image data received by the means, data extracting means for alternately extracting the image data decoded by the decoding means line by line, and extraction by the data extracting means Image reconstructing means for reconstructing the image data for every other line of the image data for each line as the first image data for one page, and the image for each line taken out by the data extracting means. Compression encoding means for re-compressing and encoding the other image data of every other line, and the compression code Storage means for temporarily storing the image data compressed and encoded by the encoding means as second image data for one page; and recording means for recording and outputting an image on a recording paper based on the image data, The first image data reconstructed by the image reconstructing unit and the second image data stored in the storage unit are alternately selected, and the first image data is output to the recording unit as it is. The second object is achieved by decoding the second image data by the decoding means and then outputting the second image data to the recording means for recording and outputting.

According to the above construction, when image data in which the front side image data and the back side image data of the double-sided original are compressed and encoded line by line is received, the image data is decoded and taken out line by line alternately. The first image data for one page is reconstructed and recorded and output by the image data for every other line, and the image data for every other line is compressed again as the second image data for one page. When the recording output of the first image data is completed after being stored in the storage means, the second image data is again decoded and recorded and output. Therefore, while reducing the memory capacity, the image data of the front surface and the back surface of the double-sided original are reduced. A facsimile device capable of appropriately reproducing image data obtained by compression-encoding image data of each line and recording and outputting it as a front side image and a rear side image is provided. Ri can be made even more inexpensive.

In each of the above cases, for example, as described in claim 7, the decoding means decodes the image data coded by the two-dimensional coding method, and at the time of the decoding, currently decodes the image data. The preceding line of the current decoded line that is being read may be referred to as a reference line.

According to the above configuration, when the image data of the front side and the image data of the back side of the double-sided original are compressed and encoded by a predetermined two-dimensional encoding method for each line, they are currently decoded. Since the preceding line of the current decoded line is referred to, even when decoding the image data compressed and encoded by the two-dimensional encoding method, the decoding should be performed while referring to the line having a correlation with the current line. The image data can be reproduced properly.

Further, for example, as described in claim 8, the decoding means decodes the image data coded by the arithmetic coding method, and at the time of decoding, the current decoding currently decoded. For the lines before the conversion line, the reference pixels at the time of decoding may be selected every other line.

According to the above configuration, when the image data of the front side and the image data of the back side of the double-sided original are compressed and encoded line by line by a predetermined arithmetic encoding method, the image data is currently decoded. For the lines before the current decoded line, the reference pixels at the time of decoding are selected every other line, so that even when decoding the image data compressed and coded by the arithmetic coding method, the correlated pixels are selected. Decoding can be performed by referring to only the image data, and the image data can be appropriately reproduced.

According to a ninth aspect of the present invention, there is provided a facsimile device for performing facsimile communication according to a predetermined facsimile communication procedure, the receiving device receiving the encoded image data transmitted from the other party, and the receiving device. Decoding means for decoding the coded image data received by the means, recording means for recording and outputting an image on a recording paper based on the image data, and continuous 2 decoded by the decoding means. Image reconstructing means for reconstructing an image by arranging the image data for one line side by side on one line in a size such that the image data can be recorded and output on the recording paper by the recording means and outputting the image to the recording means. Thus, the above-mentioned object is achieved.

According to the above construction, when the image data in which the front side image data and the back side image data of the double-sided original are compressed and encoded line by line is received, the image data is decoded and the data for two consecutive lines is decoded. Since the image data is arranged side by side to reconstruct the image and is recorded and output, the image data on the front side and the image data on the back side of the double-sided original can be recorded and output side by side on one recording sheet, which is a special memory. The front surface image and the back surface image can be recorded and output with a simple configuration without using any means. Therefore, the cost of the facsimile device can be further reduced.

[0039]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. It should be noted that the embodiments described below are preferred embodiments of the present invention, and therefore, various technically preferable limitations are added. However, the scope of the present invention is not limited to the following description. The embodiments are not limited to these embodiments unless otherwise specified.

FIGS. 1 to 5 are views showing a first embodiment of the facsimile apparatus of the present invention.
The image data of the front surface and the back surface of the double-sided original is sequentially taken out in line units, encoded by a predetermined encoding method, and transmitted, which corresponds to claim 1, claim 3, and claim 4.

FIG. 1 shows a first facsimile device according to the present invention.
FIG. 2 is a main part circuit block diagram of the facsimile apparatus 1 to which the embodiment of FIG. 1 is applied.

In FIG. 1, the facsimile apparatus 1 includes a front side reading section 2, a back side reading section 3, a selecting section 4, and a compression encoding section 5.
And a transmission unit 6 and the like, which are not shown in FIG.
In addition, each unit required for the facsimile machine 1 is provided.

The front side reading section (front side reading means) 2 and the back side reading section (back side reading means) 3 are arranged along the document feeding path, and the double-sided document 7 is fed along the document feeding path in the sub-scanning direction. Scan the images on both sides of. That is, the front surface reading unit 2
The back surface reading unit 3 may be, for example, a CCD (Charge).
A contact image scanner using a coupled device) is used, and the front surface 7a and the back surface 7b (see FIG. 2) of the double-sided original 7 that is conveyed in the sub-scanning direction on the original conveyance path are simultaneously scanned line by line. Then, the image on the front surface 7a and the image on the back surface 7b of the double-sided original 7 are read at a predetermined resolution. When the front side reading unit 2 and the back side reading unit 3 read one line of the image of the double-sided document 7, the read image data for one line are alternately output to the selection unit (takeout unit) 4. The output of the image data from the front surface reading unit 2 and the back surface reading unit 3 includes, for example, first outputting the image data for one line read by the front surface reading unit 2 to the selection unit 4, and then the back surface reading unit 3 The read image data for one line is output to the selection unit 4, and thereafter, the image data is similarly output to the selection unit 4 until the reading of the double-sided original 7 for one page is completed.

The selection unit 4 switches the compression encoding unit 5 to the front side reading unit 2 and the back side reading unit 3 line by line, and connects it to one line of the front side 7a of the double-sided original 7 inputted from the front side reading unit 2. Minute image data and the image data for one line on the back surface 7b of the double-sided original 7 input from the back surface reading unit 3 are sequentially switched and output to the compression encoding unit 5. Therefore, as shown in FIG. 3, the composite image data 8 output from the selection unit 4 to the compression encoding unit 5 is image data in which the front image line data 8a and the back image line data 8b are alternately arranged line by line. Becomes

The compression encoding unit (compression encoding unit) 5 compression-encodes the image data input from the selection unit 4 by various encoding systems and outputs it to the transmission unit (transmission unit) 6.
A line L, for example, a PSTN (public telephone line) is connected to the transmission unit 6. The transmitting unit 6 performs automatic call-out / call-in processing, and executes a facsimile control procedure with a partner facsimile apparatus via the line L to perform facsimile communication.

The compression encoding unit 5 compression-encodes the image data input through the selection unit 4 by various compression encoding systems. As this compression encoding system, for example, image data is line-coded. MH (Modified Huffman) coding method, which is one-dimensional coding for compression coding in units, 2
MR (Modufied Relative elementa), which is a three-dimensional encoding
ddress designate) encoding method and MMR (Modified M
R) Encoding is performed by an encoding method, an arithmetic encoding method, or the like.

In the case of compression coding by the one-dimensional MH coding system, the compression coding unit 5 outputs the image data of the front surface 7a and the image data of the back surface 7b input through the selection unit 4 in line units. The data is sequentially compression-encoded, output to the transmission unit 6, and transmitted from the transmission unit 6 to the facsimile apparatus of the other party by facsimile transmission.

Further, in the case of compression coding by the two-dimensional MR coding method or MMR coding method, the current code is usually shown as the relationship between the normal coding line and the reference line on the left side of FIG. The encoding line is encoded by referring to the preceding line of the encoding line to be encoded as a reference line.
As described above, since the front side image line data 8a and the back side image line data 8b are alternately arranged in the composite image data 8 input to, the front line is referred to as in the normal encoding. When encoded as described above, the front line is image data of the other side of the double-sided original 7, and therefore, for example, the front side image line data 8 of the combined image data 8 shown in FIG.
Backside image line data 8 having no correlation when a is encoded
Since b is referred to, the compression rate is reduced. Therefore,
As shown on the right side of FIG. 4 as the relationship between the coding line and the reference line in the present embodiment, the compression coding unit 5 does not refer to the preceding line 10b of the coding line 10a to be currently coded and The empty line 10c is referred to as a reference line and encoded. That is, when the coding line 10a is to be coded, the immediately preceding line 10b is not referred to, and the immediately preceding line 10 before the line 10b is referenced.
Let c be the reference line. Coding line 10a in this case
And the pre-previous line 10c, which is a reference line, are image data of the same side of the double-sided original 7 and are two consecutive lines, so that the correlation is high and the compression rate is improved. Therefore, the compression rate is the same as when the two-sided original 7 is two-dimensionally encoded one by one. In this case, the compression encoding unit 5
Requires a line memory for 2 lines.

Further, in the case of compression coding by the arithmetic coding method, as shown on the left side of FIG. 5 as an example of a normal template in the arithmetic coding, the pixel 1 indicated by X mark is used.
When encoding 1a, each surrounding pixel 11 surrounded by a square
In addition to the current encoding line 11b to be currently encoded, the reference pixel is selected from the previous line 11c and the previous line 11d. However, as in the case of the two-dimensional encoding, the composite image data 8 input to the compression encoding unit 5 is the surface image line data 8a as described above.
And the back image line data 8b are alternately arranged,
When the pixels are encoded with reference to the pixels of the previous line and the line before the same as in the case of the normal template, the previous line becomes
Since it is the image data of the other side of the double-sided original 7, and the line before the previous line is the front line of the same side, pixels having no correlation are referred to, and the compression rate is reduced. Therefore, when the compression encoding unit 5 encodes the image 12a with the X mark, as shown in the right side of FIG. 5 as an example of the template in the present embodiment, the surrounding pixels 12 surrounded by squares are referred to as reference pixels. And That is, with respect to the lines before the current encoding line 12b, the pixels to be referred to are selected every other line, the previous line 12c and the third previous line 12e are left, and the two previous lines 12d and four previous lines are selected. The pixel surrounded by the square of the line 12f is selected as the reference pixel. Therefore, it is possible to refer to the pixels of the front line 12d and the pre-previous line 12f on the same surface as the same line 12b as the pixel 12a to be encoded as a template, and when each surface of the double-sided original 7 is encoded by a normal template It can be compression-encoded at the same high compression ratio as.

Next, the operation of this embodiment will be described below. When transmitting the double-sided original 7, the facsimile apparatus 1 reads the images of the front surface 7a and the rear surface 7b of the double-sided original 7 conveyed through the original conveyance path by the front surface reading unit 2 and the back surface reading unit 3 in line units, and the front surface reading unit 2 and the image data read by the back surface reading unit 3 are output in a predetermined order, for example, from the front surface reading unit 2 to the selection unit 4 line by line, and the selection unit 4 outputs the image data.
Is the front side image line data 8a from the front side reading unit 2.
Is output to the compression encoding unit 5. When the front side reading unit 2 outputs the image data for one line to the selecting unit 4, the back side reading unit 3 then outputs the image data for one line to the selecting unit 4,
The selection unit 4 outputs the back surface image line data 8b from the back surface reading unit 3 to the compression encoding unit 5. Therefore, the composite image data 8 in which the front side image line data 8a and the back side image line data 8b are alternately arranged as shown in FIG. 3 is input from the selection unit 4 to the compression encoding unit 5.

The compression / encoding unit 5 uses the composite image data 8
Is compression-encoded and output to the transmission unit 6. At this time, 1
When performing the compression coding by the dimensional coding method, the compression coding is performed for each line as it is.

Further, when the compression coding unit 5 performs the compression coding by the two-dimensional coding method, as shown in FIG. 4, the preceding line 10 of the coding line 10a to be currently coded.
line 10 before 1 line without reference to b
Encode with reference to c as a reference line. Therefore, the coding line 10a can be coded as a reference line, which is the image data on the same plane and has a high correlation with the continuous coding line 10a, and can be coded at a high compression rate. .

Further, in the case of compression coding by the arithmetic coding system, the compression coding unit 5 surrounds the image 12a indicated by a cross mark with the surrounding pixels 12 surrounded by a square as shown in FIG. Are encoded as reference pixels. That is, with respect to the lines before the current encoding line 12a, the pixels to be referred to are selected every other line, the previous line 12b and the line 12d that is three lines before are left, and the line 12c that is two lines before and the line 12c that is four lines before are selected. The pixel surrounded by the square of the line 12e is selected as the reference pixel. Therefore, it is possible to refer to the pixels on the same line as the pixel 12a to be encoded and on the previous line and the previous line on the same surface as a template, and it is possible to perform compression encoding at the same high compression rate.

The image data compression-coded by the compression-encoding unit 5 in this way is output to the transmission unit 6, and the transmission unit 6
Is transmitted to the partner facsimile machine via the line L.

Therefore, according to the present embodiment, image data for one line is alternately taken out from the front surface reading unit 2 and the back surface reading unit 3, compressed, and then transmitted, so that one-sided image data is stored. It is possible to simultaneously read and send the double-sided original 7 without using a large-capacity storage means for reading the double-sided original 7 and to read the double-sided original 7 one by one. The facsimile device 1 can be made inexpensive and the usability of the facsimile device 1 can be improved.

When the compression encoding unit 5 performs compression by the two-dimensional encoding method, the previous line 10c of the presently encoded current line (encoded line) 10a is referred to as a reference line. It is possible to perform encoding while referring to the line 10c that has a correlation with, and it is possible to appropriately reduce the code amount. As a result, the transmission time can be shortened.

Further, when compression encoding is performed by the compression encoding unit 5 by the arithmetic encoding method, for the lines before the current line 12b currently being encoded, the reference pixels at the time of compression encoding are selected every other line. Therefore, it is possible to perform the encoding while referring to only the correlated pixels, and it is possible to appropriately reduce the code amount. As a result, the transmission time can be shortened.

When the compression encoding unit 5 encodes by the two-dimensional encoding method and the arithmetic encoding method, the above-mentioned Japanese Unexamined Patent Application Publication No.
As in the case of the conventional "double-sided scanning device" described in Japanese Patent No. 2,917,641, when data obtained by reading both sides is arranged so that both sides are arranged in the horizontal direction and it is encoded as one image data. By comparison, the amount of line memory required is small. That is, when the size in the main scanning direction is doubled, even in the case of two-dimensional encoding in which a line memory for at least two lines is required, 3
Even in the case of a template for arithmetic coding that requires a line memory for lines, in the case of the conventional "double-sided operation device", the line memory size is simply doubled, but the compression code according to the present embodiment is used. In the above encoding method in the encoding unit 5,
In the case of two-dimensional encoding, the line memory is 3/2 = 1.
In the case of 5 times arithmetic coding, a memory amount of 5/3 = 1.67 times is sufficient, and the code amount is almost the same as described above.

FIG. 6 shows a second facsimile machine according to the present invention.
FIG. 6 is a diagram showing an embodiment of the present invention, and this embodiment changes the compression method according to the function of the transmission destination, and corresponds to claim 2, claim 3 and claim 4. . The present embodiment is applied to the same facsimile machine as that of the first embodiment, and in the description of the present embodiment, the same components as those of the first embodiment will be described. The same reference numerals are given and detailed description thereof will be omitted.

In FIG. 6, the facsimile device 20 is
The front surface reading unit 2, the back surface reading unit 3, which are similar to those in the above-described embodiment,
The selection unit 4, the compression encoding unit 5, and the transmission unit 6 are included, and the memory unit 21, the selection unit 22, the compression encoding unit 23, and the like are included. The compression encoding unit 23 encodes with the decoding unit 24. The unit 25 and the like are provided.

The front side reading section 2 and the back side reading section 3 are the front side 7a and the back side 7b of the double-sided original 7 conveyed through the original conveying path.
Are read and output to the selection unit 4, and the selection unit 4
Outputs the front side image line data 8a and the back side image line data 8b sequentially sent line by line from the front side reading unit 2 and the back side reading unit 3 to the compression encoding unit 5 as the combined image data 8 (see FIG. 3). To do.

The compression encoding unit 5 encodes the composite image data 8 input from the selection unit 4 by the one-dimensional encoding system, the two-dimensional encoding system, the arithmetic encoding system or the like, and the memory unit. 21 is output.

The memory unit 21 temporarily stores the image data encoded by the compression encoding unit 5 and outputs the image data to the selection unit 22. The selection unit 22 stores the memory unit 21 in the compression encoding unit 23 and the transmission unit. 6 is selectively connected, and the compressed image data input from the memory unit 21 is output to the compression encoding unit 23 or the transmission unit 6.

The operation of the selection unit 22 is controlled by the control unit of the facsimile apparatus 1 (not shown), and the control unit controls the image data of the double-sided original 7 compressed line by line by the facsimile apparatus to which the image data is transmitted. The operation of the selection unit 22 is controlled depending on whether or not it has a reproduction function of taking out for each line, reconstructing and recording and outputting. That is, at the time of facsimile transmission, the facsimile device 20 exchanges a facsimile control signal with a destination facsimile device to execute a facsimile control procedure. At this time, the control unit controls the facsimile control transmitted from the destination. Based on the signal, it is determined whether or not the destination facsimile machine has the reproduction function. When the destination facsimile machine has the reproduction function, the selection unit is arranged to connect the memory unit 21 to the transmission unit 6. When the destination facsimile machine does not have a reproducing function, the selecting section 22 is switched so that the memory section 21 is connected to the compression encoding section 23.

As described above, the compression encoding unit 23 includes the decoding unit 24 and the encoding unit 25, and the decoding unit 24
Is a unit for sequentially decoding the encoded image data input from the memory unit 21 via the selection unit 22 for each line,
The decoded image data is output to the encoding unit 25 every other line. That is, the decoding unit 24 decodes the compression-encoded composite image data 8 every other line, outputs the decoded image data to the encoding unit 25, and sequentially repeats the process of discarding the other line image data. For example, when only the front side image line data 8a is decoded and output to the encoding unit 25, and the front side image line data 8a for one page is decoded and output to the encoding unit 25, next, the selection unit 22 again. Only the back-side image line data 8b of the compression-coded combined image data 8 input from the memory unit 21 via the is decoded and output to the coding unit 25.

The encoding unit 25 compression-encodes the decoded front image line data 8a and back image line data 8b input from the decoding unit 24 in the same manner as the compression encoding unit 5, and the transmitting unit 6 Output to. The encoding unit 25
When the image data is encoded by the two-dimensional encoding method and the arithmetic encoding method, the image data is encoded by the normal two-dimensional encoding method and the arithmetic encoding method.

Therefore, according to this embodiment, the image data is alternately taken out from the front side reading section 2 and the back side reading section 3 for each line, and the front side image line data 8a and the back side image line data 8b are alternately arranged. The combined image data 8 is compressed by the compression encoding unit 5 and temporarily stored in the memory unit 21. Then, depending on whether or not the destination facsimile device has a reproduction function, the image data compressed and encoded by the compression encoding unit 5 is transmitted as it is, or the compressed composite image data 8 is set as the front image line data 8a. The rear side image line data 8b can be transmitted by selecting whether to re-compress by the compression encoding unit 23 and transmit. As a result, it is possible to transmit image data that is appropriately coded according to the function of the facsimile machine of the other party, and to transmit image data that allows the other party to appropriately record and output the image of the double-sided original 7. it can. Therefore, the usability of the facsimile device can be further improved.

FIG. 7 shows a third embodiment of the facsimile apparatus of the present invention.
FIG. 3 is a diagram showing an embodiment of the present invention. In the present embodiment, when image data in which front-side image data and back-side image data of a double-sided original is compressed and encoded line by line is received, the image data is decoded. The data is alternately taken out line by line, reconstructed as image data of the front surface and image data of the back surface, and recorded and output. This corresponds to claims 5, 7, and 8.

In FIG. 7, the facsimile device 30 is
Reception unit 31, decoding unit 32, selection unit 33, and output unit 34
Although not shown in the figure, each unit is provided with other components required for the facsimile device 30.

The receiving unit 31 has a line L, for example, PST.
N (public telephone line) is connected, and the receiving unit 31 is
In addition to performing automatic call-in / call-out processing, a facsimile control procedure is executed with the other facsimile device via the line L to perform facsimile communication.

The decoding section 32 decodes the compression-coded image data received by the receiving section 31 by a predetermined decoding method, and outputs the decoded image data to the selecting section 33. For example, the decoding unit 3
2 indicates that when the image data is compression-encoded by the one-dimensional encoding method, it is decoded according to the encoding method, and when the image data is compression-encoded by the two-dimensional encoding method, it is in accordance with the encoding method. Decrypt. Further, when the image data is compression-encoded by the arithmetic encoding method, it is decoded according to the arithmetic encoding method.

Then, the decoding section 32, when performing decoding by the two-dimensional coding method, performs decoding by referring to the line before the decoding line as the reference line as shown in FIG. That is, similarly to the case of the encoding shown in FIG. 4, normally, the preceding line of the decoding line to be currently decoded is referred to as a reference line for decoding, but the image data 8 input to the decoding unit 32 is As described above, since the front side image line data 8a and the back side image line data 8b are alternately arranged, when the decoding is performed by referring to the preceding line like the normal decoding, the preceding line becomes Since the image data is the image data of the other side of the double-sided original 7, the line data having no correlation is referred to when decoding, and the decoding cannot be performed properly. Therefore, the decoding unit 32
In the same manner as shown on the right side of FIG. 4, without referring to the preceding line of the decoding line to be currently decoded, the preceding line immediately after one line is referred to as a reference line for decoding. In this case, the decryption line and the reference line are double-sided original 7
Since it is the image data of the same plane and is two continuous lines, it can be appropriately decoded.

Further, when decoding by the arithmetic coding method, the decoding section 32 selects a pixel to be referenced every other line with respect to the lines before the current decoding line, as shown in FIG. .

That is, as shown on the left side of FIG.
With respect to the pixel to be decoded indicated by the mark, each surrounding pixel surrounded by a square is referred to. In addition to the current decoding line to be currently decoded, the reference pixel is selected from the previous line and the line before the previous line. . However, the image data input to the decoding unit 32 has the front image line data 8a and the back image line data 8b alternately arranged, as described above, and therefore, as in the case of the normal template, When decoding is performed by referring to the pixels of the previous line, the previous line is the image data of the other side of the double-sided original 7, and the previous line is the previous line of the same side. Will be referred to and cannot be properly decoded.
Therefore, the decoding unit 32, as shown on the right side of FIG.
With respect to the decoding target pixel of the mark, for the lines before the current decoding line, select the reference pixel every other line, leave the previous line and the third previous line, and select the second previous line. And the pixel surrounded by the square of the line four lines before is selected as the reference pixel. Therefore, it is possible to refer to the pixels on the same line as the pixel to be decoded and on the front line and the line before the line on the same side as the template, and it is appropriate as in the case where each side of the double-sided original 7 is decoded by the normal template. Can be decrypted.

The selection unit 33 includes a switching unit 35 and two memories 36 and 37. The switching unit 35 includes the decoding unit 32.
The decoding unit 35 is sequentially switched and connected to the memory 36 and the memory 37 for each line of the decoded image data of. The memories 36 and 37 sequentially store the image data input from the switching unit 35, and when one page of image data is input, the memories 36 and 37 are reconfigured as one page of front side image data and one page of back side image data and output. It is output to the unit 34.

The output unit 34 is, for example, a thermal recording device using a thermal element or an electrophotographic recording device, and the output unit 34 uses one page of image data input from the memory 36 and the memory 37. Based on the above, the image is recorded and output on the recording paper.

Next, the operation of this embodiment will be described below. The facsimile device 30 receives the compression-coded image data transmitted from the partner facsimile device by the reception unit 31, and outputs the image data to the decoding unit 32. The compression-encoded image data has the front surface 7a and the back surface 7b of the double-sided original 7 alternately compressed line by line, and is encoded by a one-dimensional encoding method, a two-dimensional encoding method or an arithmetic encoding method. Has been done. The decoding unit 32
The compression-encoded image data is decoded by the same encoding method as the encoding method used for encoding the image data, and is output to the selection unit 33. That is, when the image data is compressed and encoded by the one-dimensional encoding method, the image data is decoded according to the encoding method, and the image data is
When compression coded by the dimensional coding method,
Decoding is performed according to the encoding method. Further, when the image data is compression-encoded by the arithmetic encoding method, it is decoded according to the arithmetic encoding method.

Then, the decoding unit 32, when performing decoding by the two-dimensional coding method, refers to the line before the decoding line as the reference line, as described above, and performs decoding by the arithmetic coding method. When decoding by, the pixels of the template to be referenced are selected every other line before the current decoded line and decoded. Therefore, it is possible to appropriately decode the image data encoded by the two-dimensional encoding method or the arithmetic encoding method.

The selecting unit 33 causes the switching unit 35 to distribute and store the decoded image data sequentially input from the decoding unit 32 in units of lines into the memory 36 and the memory 37. 37 is reconstructed as one page of front side image data and back side image data.

Of the image data in the memory 36 and the memory 37, the surface image data is output to the output unit 34,
When the output unit 34 records and outputs the image of the front side image data on the recording paper, next, the back side image data is output from the memory 36 or the memory 37 to the output unit 34, and the output unit 34 records the image of the back side image data. Print out on paper.

In the same manner as above, after receiving all the image data and decoding it, it is reconstructed as the front side image data and the back side image data and recorded and output on the recording paper.

Therefore, according to the present embodiment, the image data of the front surface 7a and the image data of the back surface 7b of the double-sided original 7 are received by compression-encoding each line,
The image data is decoded by the decoding unit 32 and alternately taken out line by line, reconstructed in the memories 36 and 37 as the image data of the front surface 7a and the image data of the back surface 7b, and recorded and output. It is possible to appropriately reproduce the image data in which the image data of the front surface 7a and the image data of the back surface 7b are compression-coded line by line, and record and output as a front image and a back image.

Further, the image data is the front surface 7a of the double-sided original 7.
If the image data of and the image data of the back surface 7b are compression-encoded for each line by a predetermined two-dimensional encoding method,
Since the decoding is performed by referring to the line before the current decoded line that is currently being decoded, it is possible to perform decoding while referring to the line having a correlation with the current line. The image data can be properly reproduced.

Further, the image data is the front side 7 of the double-sided original 7.
If the image data of a and the image data of the back surface 7b are compression-coded line by line by a predetermined arithmetic coding method,
As for the lines before the current decoded line currently being decoded, the reference pixels at the time of decoding are selected every other line, so that it is possible to decode while referring to only the correlated pixels. It is possible to properly reproduce the compression-coded image data.

FIG. 8 shows a fourth example of the facsimile apparatus of the present invention.
FIG. 3 is a diagram showing an embodiment of the present invention. In the present embodiment, when image data in which front-side image data and back-side image data of a double-sided original is compressed and encoded line by line is received, the image data is decoded. Alternately, every other line is taken out, and the image data of every other line is reconstructed as the image data of one page by the decoded image data and recorded and output, and the other image data of every other line is After compressing and storing, and after recording and outputting one image data,
It is decrypted again and recorded and output, which corresponds to claims 6, 7 and 8. The present embodiment is applied to the same facsimile machine as the third embodiment, and in the description of the present embodiment, the same components as those in the third embodiment will be described. The same reference numerals are given and detailed description thereof will be omitted.

In FIG. 8, the facsimile device 40 is
The receiving unit 31 and the decoding unit 3 similar to those in the third embodiment.
2 and an output unit 34, and the like, and a selection unit 41, a compression encoding unit 42, a memory unit 43, and the like.

The receiving unit 31 receives the image data in which the image data of the front surface 7a and the image data of the back surface 7b of the double-sided original 7 are compression-coded line by line, and outputs the image data to the decoding unit 32. 32 decodes the encoded image data input from the receiving unit 31 line by line according to the encoding method of the image data, and outputs the decoded image data to the selecting unit 41. .

The selection unit 41 includes a switching unit 44 and two memories 45 and 46, and the switching unit 44 includes the decoding unit 32.
The decoding unit 35 is sequentially switched and connected to the memory 45 and the memory 46 for each line of the decoded image data of. The memory 45 sequentially stores the image data input from the switching unit 44, and when the image data for one page is input, it is set to 1
It is reconstructed as image data of a page, for example, surface image data, and output to the output unit 34. The memory 46 may have a smaller capacity than the memory 45 and may have a capacity to store at least one line of the image data encoded by the decoding unit 32. When the decoded image data for one line is input from the decoding unit 32, the memory 46 outputs the image data for one line to the compression encoding unit 42. In the present embodiment, when the memory 46 is provided and the image data for one line is stored, the image data for one line is output to the compression encoding unit 42. Instead of providing the decoded image data, the decoded image data input from the decoding unit 32 via the switching unit 44 may be directly output to the compression encoding unit 42. By doing so, the required memory amount can be further reduced.

The compression encoding unit 42 compression-encodes the decoded image data input from the memory 46 by a predetermined encoding method and outputs it to the memory unit 43.

The memory unit 43 has a capacity for storing one page of the image data compressed by the compression encoding unit 42, and sequentially stores the compressed image data input from the compression encoding unit 42. When the image data stored in the memory 45 of the selection unit 41 for one page is output to the output unit 34 and the recording / output of the image based on the image data is completed, the stored compression-coded image data for one page is stored. Is output to the decoding unit 32.

The decoding section 32 decodes the compression-encoded image data of one page input from the memory section 43 and outputs it to the output means 34.

The output unit 34 is the memory 4 of the selection unit 41.
The image is recorded and output on a recording sheet based on the image data input from the image processing unit 5 and the image data input from the decoding unit 32.

Therefore, according to the present embodiment, the facsimile device 40 receives the compression-encoded image data transmitted from the receiving facsimile device by the receiving part 31 and outputs it to the decoding part 32. The compression-encoded image data is alternately compressed on the front surface 7a and the back surface 7b of the double-sided original 7 line by line, and is encoded by the one-dimensional encoding method, the two-dimensional encoding method or the arithmetic encoding method. Has been done. As in the third embodiment, the decoding unit 32 decodes the compression-coded image data by the same decoding system as the coding system in which the image data is coded, and the selection unit Output to 41.

The selecting section 41 distributes the decoded image data sequentially input from the decoding section 32 on a line-by-line basis to the memory 45 and the memory 46 for each line by the switching section 44 and outputs the decoded image data to the memory 45. It is reconstructed as image data for pages, for example, surface image data.

The image data output to the memory 46 is 1
Output to the compression encoding unit 42 for each line, and the compression encoding unit 4
The data is compressed and encoded again in 2 and stored in the memory unit 43.

When the decoded image data for one page is reconstructed in the memory 45 and the compressed and encoded image data for one page is stored in the memory 43, the image data is first read from the memory 45. Read out the output section 3
4 and the output unit 34 records and outputs an image for one page, for example, the image on the front surface 7a. When the recording of the image with the image data from the memory 45 is completed, the compression-coded image data is read from the memory unit 43,
The data is output to the decoding unit 32, decoded by the decoding unit 32, and output to the output unit 34. The output unit 34 records and outputs the image of one page, for example, the image on the back surface 7b on the recording paper based on the image data decoded by the decoding unit 32.

By repeating the above processing in sequence,
The received image data is reproduced and recorded and output.

Therefore, according to the present embodiment, the image data decoded by the decoding unit 32 is alternately taken out line by line, and one page of image data at every other line is converted into, for example, surface image data. Is reconfigured in the memory 45 to be recorded and output, and at the same time, one page of the other image data every other line is recompressed by the compression encoding unit 42 via the memory unit 46, for example, the back side image data, When the image data is stored in the memory unit 43 and recording of one image data is completed, the other image data is read from the memory unit 43,
Since the decoding unit 32 decodes and the output unit 34 records and outputs the image data, the image data of the front surface 7a and the image data of the back surface 7b of the double-sided document 7 are appropriately reproduced line by line. It is possible to record and output as a front side image and a back side image. As a result, a small capacity memory can be used as the memory 46, and the compressed image data is stored in the memory section 43. Therefore, a small capacity memory can be used as the memory section 43, and the facsimile device 40 can be used. It can be cheap. In this case, the memory 46 is omitted and the direct switching unit 44 is
When the image data is output from the compression encoding unit 42 to the facsimile device 40, the cost can be further reduced.

The image data is the front surface 7a of the double-sided original 7.
If the image data of and the image data of the back surface 7b are compression-encoded for each line by a predetermined two-dimensional encoding method,
Since the decoding is performed by referring to the line before the current decoded line that is currently being decoded, it is possible to perform decoding while referring to the line having a correlation with the current line. The image data can be properly reproduced.

Further, the image data is the front side 7 of the double-sided original 7.
If the image data of a and the image data of the back surface 7b are compression-coded line by line by a predetermined arithmetic coding method,
As for the lines before the current decoded line currently being decoded, the reference pixels at the time of decoding are selected every other line, so that it is possible to decode while referring to only the correlated pixels. As described above, the invention made by the present inventor has been specifically described based on the preferred embodiment as long as the compression-encoded image data can be properly reproduced, but the present invention is not limited to the above. It goes without saying that various modifications can be made without departing from the spirit of the invention.

For example, in the third and fourth embodiments, the images on the front surface 7a and the back surface 7b of the double-sided original 7 are recorded and output on one page of the recording paper, respectively. However, the image data decoded by the decoding unit 32 is repeatedly arranged in the horizontal direction with one line of the front image data and one line of the back image data, as shown in FIG. The image data of the front surface 47 and the back surface 48 may be arranged in the horizontal direction and reconstructed. However, in this case, since the size of the image data in the main scanning direction is doubled, reduction processing such as thinning processing of the image data is performed to reduce the main scanning size to fit within the width of the recording paper. Further, at this time, in order not to impair the recognizability, it is better to reduce the size in the sub-scanning direction as well.

Image data in a state in which the image data of the front surface 47 and the back surface 48 thus reconstructed in this way are arranged side by side is output to the output unit 34 and recorded and output on recording paper.

By doing so, the memory can be further reduced and the facsimile apparatus can be made even more inexpensive.

[0104]

According to the facsimile machine of the present invention, the image data is alternately taken out line by line from the front side reading means and the back side reading means, compressed, and transmitted. A double-sided original can be simultaneously read and transmitted without using any means, and a facsimile apparatus that can simultaneously read and appropriately transmit a double-sided original can be made inexpensive.

According to the second aspect of the present invention, the image data is alternately taken out line by line from the front side reading means and the back side reading means, and the image data is directly compressed and transmitted according to the function of the destination. , Select whether to re-compress the compressed image data for each of the front side image data and the back side image data and send it. Therefore, it is possible to send appropriate image data according to the function of the other party. The image of the double-sided original can be appropriately recorded and output first.

According to the facsimile apparatus of the third aspect of the present invention, when the image data is alternately taken out line by line from the front side reading means and the back side reading means and compressed by the predetermined two-dimensional encoding method, it is currently encoded. Since the image data of the line before the current line that is being referred to is referred to as a reference line, even when performing compression encoding by a two-dimensional encoding method, encoding is performed while referring to a line having a correlation with the current line, The code amount can be appropriately reduced, and the transmission time can be shortened.

According to the fourth aspect of the present invention, when the image data is alternately taken out line by line from the front side reading means and the back side reading means and compression-coded by a predetermined arithmetic coding method, the present code is used. For the lines before the current line being encoded, the reference pixels at the time of compression encoding are selected every other line, so that even when performing compression encoding by the arithmetic encoding method, the encoding is performed by referring to only the correlated pixels. It is possible to appropriately reduce the code amount and shorten the transmission time.

According to the fifth aspect of the present invention, when the image data in which the front side image data and the back side image data of the double-sided original are compressed and encoded line by line is received, the image data is decoded. The image data of the front side and the image data of the back side of the double-sided original are compression-encoded line by line because the image data of the front side and the image data of the back side are reconstructed and recorded and output. The image data can be appropriately reproduced and recorded and output as a front side image and a back side image.

According to the facsimile apparatus of the present invention, when the image data in which the front side image data and the back side image data of the double-sided original are compressed and encoded line by line is received, the image data is decoded. Alternately, each line is alternately taken out, and the first image data for one page is reconstructed and recorded and output by the image data for every other line, and the image data for every other line is compressed again for one page. When the recording output of the first image data is completed after the second image data is stored in the storage means as the second image data of the second image data, the second image data is again decoded and recorded and output. It is possible to properly reproduce the image data in which the front side image data and the back side image data are compression-coded line by line, and to record and output as the front side image and the back side image. It can be a facsimile apparatus and more even more inexpensive that can.

According to the facsimile apparatus of the invention, the image data of the front surface and the image data of the back surface of the double-sided original are compressed and encoded line by line by a predetermined two-dimensional encoding method. When converting, the line before the current decoded line currently being decoded is referred to. Therefore, even when decoding the image data compressed and coded by the two-dimensional coding method, the line having the correlation with the current line is decoded. It is possible to decode the image data while referring to, and to appropriately reproduce the image data.

According to the facsimile apparatus of the present invention, the image data of the front side and the image data of the back side of the double-sided original are compressed line by line by a predetermined arithmetic encoding method to decode the image data. In the case of decoding the image data compressed and coded by the arithmetic coding method, since the reference pixel at the time of decoding is selected for every line before the current decoded line currently being decoded. Also, it is possible to perform decoding while referring to only pixels having correlation, and it is possible to appropriately reproduce image data.

According to the facsimile apparatus of the present invention, when the image data in which the front side image data and the back side image data of the double-sided original are compressed and encoded line by line is received, the image data is decoded. Image data for two consecutive lines are arranged side by side to reconstruct an image and print it out. Therefore, the image data on the front side and the image data on the back side of a double-sided original are printed side by side on one sheet of recording paper. Therefore, the front side image and the back side image can be recorded and output with a simple configuration without using a special storage means. Therefore, the cost of the facsimile device can be further reduced.

[Brief description of drawings]

FIG. 1 is a block diagram of a main circuit of a facsimile apparatus to which a first embodiment of a facsimile apparatus of the present invention is applied.

FIG. 2 is a top view of the front and back surfaces of a double-sided original read by the facsimile apparatus of FIG.

3 is a diagram showing composite image data compressed by a compression encoding unit of the facsimile apparatus of FIG.

FIG. 4 is a diagram showing a relationship between a normal coding line and a reference line in a two-dimensional coding method and a relationship between a coding line and a reference line in the present embodiment.

FIG. 5 is a diagram showing an example of a normal template in an arithmetic coding method and an example of a template in the present embodiment.

FIG. 6 is a block diagram of a main circuit of a facsimile apparatus to which the second embodiment of the facsimile apparatus of the present invention is applied.

FIG. 7 is a circuit block configuration diagram of a main part of a facsimile machine to which a third embodiment of the facsimile machine of the present invention is applied.

FIG. 8 is a circuit block configuration diagram of a main part of a facsimile apparatus to which a fourth embodiment of the facsimile apparatus of the present invention is applied.

FIG. 9 is a top view of a recording paper showing a state in which the front surface and the back surface of a double-sided original are recorded and output on one recording paper.

FIG. 10 is a circuit block diagram of a conventional facsimile apparatus.

[Explanation of symbols]

 1, 20, 30, 40 Facsimile device 2 Front-side reading unit 3 Back-side reading unit 4 Selection unit 5 Compression encoding unit 6 Sending unit 7 Double-sided document 7a Front side 7b Back side 8 Composite image data 8a Front-side image line data 8b Back-side image line data 10a Encoding line 10b Previous line 10c Pre-preceding line 11a, 12a Pixels 11b, 12b Current encoding line 11c, 12c Pre-line 11d Pre-preceding line 12d Two-preceding line 12e Three-preceding line 12f Four-preceding line 21 Memory Section 22 selection section 23 compression encoding section 24 decoding section 25 encoding section 31 receiving section 32 decoding section 33 selection section 34 output section 35 switching section 36, 37 memory 41 selection section 42 compression encoding section 43 memory section 44 switching Part 45,46 Memory

Claims (9)

[Claims] 1. A surface reading means for reading an image on the surface of an original by scanning the surface of an original conveyed in the sub-scanning direction in the main scanning direction in a facsimile apparatus which performs facsimile communication by a predetermined facsimile communication procedure. A back surface reading unit that scans the back surface of the document conveyed in the sub-scanning direction in the main scanning direction to read an image on the back surface of the document,
Data extracting means for alternately extracting image data for one line from the front surface reading means and the back surface reading means, and a compression code for compression encoding the image data extracted by the data extraction means by a predetermined compression encoding method. A facsimile apparatus comprising: an encoding unit; and a transmitting unit that transmits the image data compressed and encoded by the compression encoding unit to a destination. 2. A front face reading means for reading an image on the surface of a document by scanning the surface of a document conveyed in the sub-scanning direction in the main scanning direction in a facsimile apparatus for performing facsimile communication by a predetermined facsimile communication procedure. A back surface reading unit that scans the back surface of the document conveyed in the sub-scanning direction in the main scanning direction to read an image on the back surface of the document,
Data extracting means for alternately extracting image data for one line from the front surface reading means and the back surface reading means, and a compression code for compression encoding the image data extracted by the data extraction means by a predetermined compression encoding method. Encoding means, storage means for temporarily storing the image data compressed and encoded by the compression encoding means, and decoding the image data temporarily stored in the storage means, Encoding / decoding means for separately re-encoding image data and backside image data, and the image data and the encoding / decoding temporarily stored in the storage means according to the function of the destination. Selecting means for selecting any of the image data encoded by the means, and transmitting means for transmitting the image data selected by the selecting means to the other party. Facsimile apparatus characterized by a. 3. The compression encoding means compression-encodes the image data by a predetermined two-dimensional encoding method, and refers to the line before the current line currently encoded as a reference line in the compression encoding. The facsimile apparatus according to claim 1 or 2, wherein 4. The compression encoding means compression-encodes the image data by a predetermined arithmetic encoding method, and at the time of the compression encoding, the lines before the current line currently being encoded are compressed and encoded. 3. The facsimile apparatus according to claim 1, wherein the reference pixel is selected every other line. 5. A facsimile device for performing facsimile communication according to a predetermined facsimile communication procedure, receiving means for receiving encoded image data transmitted from a destination, and the encoded data received by the receiving means. Decoding means for decoding image data and the image data decoded by the decoding means are alternately taken out line by line and reconstructed as one page of first image data and second image data. A facsimile apparatus comprising: an image reconstructing unit; and a recording unit that records and outputs an image on a recording sheet based on the image data reconstructed by the image reconstructing unit. 6. A facsimile apparatus for performing facsimile communication according to a predetermined facsimile communication procedure, receiving means for receiving encoded image data transmitted from a destination, and the encoded data received by the receiving means. Of the decoding means for decoding the image data, the data extracting means for alternately extracting the image data decoded by the decoding means line by line, and the image data for each line extracted by the data extracting means An image reconstructing unit that reconstructs the image data for every other line as the first image data for one page, and for every other line of the image data for each line taken out by the data extracting unit. A compression coding unit for compressing and coding the image data again, and the image data compressed and coded by the compression coding unit. Comprising storage means for temporarily storing the data as the second image data for one page, and a recording means for recording output to the recording paper an image based on the image data,
The first image data reconstructed by the image reconstructing unit and the second image data stored in the storage unit are alternately selected, and the first image data is output to the recording unit as it is. And outputs the recorded data, and after decoding the second image data by the decoding means,
A facsimile machine characterized by outputting to the recording means for recording output. 7. The decoding means decodes the image data coded by a two-dimensional coding method, and at the time of decoding, the preceding line of the current decoding line currently being decoded is used as a reference line. The facsimile apparatus according to claim 5 or 6, which is referred to. 8. The decoding means decodes the image data coded by an arithmetic coding method, and at the time of decoding, the lines before the current decoding line currently being decoded are at the time of decoding. 7. The facsimile apparatus according to claim 5 or 6, wherein the reference pixel of is selected every other line. 9. A facsimile apparatus for performing facsimile communication according to a predetermined facsimile communication procedure, receiving means for receiving encoded image data transmitted from a partner, and the encoded means received by the receiving means. Decoding means for decoding image data, recording means for recording and outputting an image on recording paper based on the image data, and recording the continuous two lines of image data decoded by the decoding means. An image reconstructing means for reconstructing an image by arranging it side by side on one line in a size that can be recorded and output on the recording sheet by the means and outputting the image to the recording means.