JPH09307772A - Facsimile communication equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To conduct confidential communication in which a reception original is easily read at data reproduction. SOLUTION: A transmitter side facsimile equipment 21 compresses, ciphers and image-codes image data of a visually observed graphic of confidential information of a transmission original 26 so as to convert the ciphered data into coded data in a form that one data unit of the ciphered data is expressed by a plurality of picture element matrices. The equipment 21 sends the coded data to a receiver side facsimile equipment 22 via a public telephone line 23. The equipment 22 applies recording conversion to the received data as they are and prints out the data onto recording paper to generate a reception original 35. The confidential information of the received original 35 is indicated visually as a coded graphic of a different form from the visually observed graphic. A recipient uses a reader 66 to read again the coded graphic of the received original 35 so as to form image data, the image data are decoded, deciphered and expanded to be reproduced into image data of the visually observed graphic.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facsimile communication device capable of so-called confidential communication.

[0002]

2. Description of the Related Art In a facsimile machine, transmitted document data is printed on recording paper at the same time as it is received. As a result, the description content of the received document data is disclosed to a third party. There is a demand for a device capable of performing so-called confidential communication in order to transmit document data containing confidential information in such a facsimile device. In this confidential communication, it is necessary to manage the document data received by the facsimile machine on the receiving side by some method so that the recording paper on which the content is printed is not inadvertently seen by a third party.

As a first conventional technique for realizing confidential communication in a facsimile machine, there is a mechanical method described below. When performing confidential communication by a mechanical method, the sender of the confidential document in which the confidential content is described causes the facsimile device to read the confidential document as it is and transmits the confidential document.
The facsimile machine on the receiving side prints the document data of the transmitted confidential document as it is on the recording paper. After that, the printed recording paper is folded and bound so that the printed surface is not visible from the outside. In another method, the recording paper on which the received contents are printed is stored in a storage container. The recording paper outlet of the storage container is locked, and only the person who possesses the key can remove the recording paper from the storage container.

In the facsimile apparatus using the confidential communication of such a mechanical method, it is necessary to add a mechanism for binding the printed recording sheets and a storage container for storing the printed recording sheets to the receiving facsimile apparatus. Such components are not necessary for a facsimile machine that does not perform confidential communication. Therefore, the number of parts of the facsimile apparatus is increased by the amount corresponding to these components, and the cost of the entire apparatus is increased.

As a second conventional technique for performing confidential communication, there is a method of electronically storing a confidential document. In a facsimile device that performs confidential communication using this method, the received confidential document data is recorded as an electrical signal in a recording medium such as a random access memory and an external storage device. The recipient who should receive this confidential document data is
The confidential document data recorded in these recording media is selectively taken out and printed using, for example, a password. In the facsimile machine of such a method, confidential document data cannot be printed and visually displayed to a third party who does not know the password. Thereby, confidential communication can be realized.

When such a method is used, the facsimile machine on the receiving side is prepared with a recording medium for recording confidential document data. In this device, when the data amount of confidential document data is larger than the recording capacity of the recording medium of the receiving side facsimile device, the confidential document cannot be transmitted at one time. Further, the data cannot be erased from the recording medium unless the recipient prints the received confidential document data. Therefore, if a plurality of confidential document data are continuously transmitted without printing, the confidential document data may be accumulated in the recording medium and the capacity of the recording medium may be exceeded. At this time, even if different confidential document data is transmitted, the document data cannot be recorded by the receiving facsimile device. As described above, this conventional technique cannot receive confidential document data exceeding the capacity of the recording medium. Therefore, in order to always receive the confidential document, it is necessary to prepare a recording medium having a large capacity.

In the above-mentioned first and second conventional facsimile machines, the transmitting facsimile machine transmits confidential document data by the same method as the conventional facsimile communication method. When this document data is received by, for example, a facsimile device that does not perform confidential communication, it is printed at the same time as the data is received and is disclosed to a third party. Facsimile apparatuses that perform confidential communication according to the above-described method often have two modes: a normal mode in which such document data is not classified and a confidential mode in which confidential communication is performed as described above.

When confidential communication is performed by a facsimile device having these two modes, the sender of the confidential document contacts the receiver of the confidential document separately in advance and switches the mode of the facsimile device on the receiving side to the confidential mode. I will let you.
Further, a switching signal for switching the mode of the receiving side facsimile device and a password are mixed in the confidential document data to be transmitted, and the receiving side facsimile device is set to the confidential mode only when these switching signal and password are received. Switch to.

As described above, in the above-mentioned first and second conventional techniques, it is necessary to determine that the document transmitted between the facsimile machines on the transmitting side and the receiving side is confidential document data. As a result, confidential communication using such a method can be performed by, for example, a user and a provider of a specific facsimile service in which the sender and the receiver make an arrangement in advance, or a specific transmission for which a common arrangement is made. It can only be performed between receiving faxes. Therefore, it is difficult for a facsimile apparatus that performs confidential communication by such a method to perform confidential communication with an unspecified number of users.

Further, as a third prior art of a facsimile communication apparatus for performing confidential communication, Japanese Patent Laid-Open No. 296565/1988 is proposed.
Issue publications are listed. FIG. 14 is a block diagram showing the electrical configuration of the facsimile device disclosed in this publication. The document data of the transmission original 3 which is a confidential document is transmitted from the transmission side facsimile apparatus 1 to the reception side facsimile apparatus 2. The transmission original 3 is optically read, for example, by the reading system 4 of the transmission side facsimile apparatus 1 and converted into an electric signal. This electrical signal is encoded in the codec unit 5 according to a predetermined encoding method. At this time, the codec unit 5 encrypts the document data converted into the electric signal by a predetermined method. As a result, the document data of the transmission original 3 becomes encoded data represented by a code of a combination of "0" and "1", for example. This encoded data is derived from the modem 6 to the public telephone line 7.

The receiving side facsimile device 2 receives the document data transmitted via the public telephone line 7 by the modem 8. The received document data is printed as it is in the recording system 9, and the code record 10 is created. The code record 10 is a recording paper on which pixels for black display and pixels for white display are printed corresponding to a combination of "0" and "1" of document data, for example. The image visually displayed on the code record 10 is different from the image of the transmission original 3. The receiver causes the reading system 11 of the receiving side facsimile apparatus 2 to read the code record 10. In the reading system 11, for example, the black display pixel of the code record 10 is read as "1" and the white display pixel is read as "0". As a result, the encoded data of the transmitted document data is reproduced. The reproduced coded data is decoded by the decoding unit 12. As a result, the same image data as the image data of the transmission original 3 is reproduced. The recording system 9 records and converts the reproduced image data supplied from the decoding unit 12 and prints it on recording paper. As a result, the reproduction record 13 in which the document data transmitted from the facsimile apparatus 1 is printed is created. The reproduction record 13 is an image represented by the reproduced image data printed on a recording sheet.

As described above, the receiving side facsimile apparatus 2 prints the received document data as it is. As a result, the printed image of the code record 10 is different from the image of the transmission original document 3, and it is difficult for a third party to grasp the transmission content just by looking at the code record 10. therefore,
Confidentiality of transmitted contents. Further, in order to reproduce the confidential document, the code record 10 is reproduced again by the facsimile device 2.
Since the reading system 11 reads the confidential data, the device 2 may not be ready to receive the confidential document when the document data is received. Therefore, regardless of the state of the receiving side facsimile device 2, the transmitting side facsimile device 1 can transmit the document data of the confidential document.

The transmitted encoded document data is printed on recording paper as a code recording 10. In a facsimile apparatus, a thermal paper is often used as a recording paper, and the thermal paper displays white and black pixels of a pixel according to heat and pressure. In this recording paper, pixels for white display are easily replaced with black display when the paper surface is scratched, for example. In addition, dirt or the like is likely to adhere to the recording paper during storage. As described above, in the scratched and soiled code record 10, the coded document data visually displayed on the print surface is damaged.

In the code record 10, the coded document data is often printed, for example, with one bit corresponding to one pixel. When the reading system 11 reads the code record 10 printed in this way, the coded document data visually displayed on the print surface of the code record 10 is displayed in the same order as the bit sequence of the data and each bit Need to read in units. At this time, if the arrangement direction of the pixels on the printing surface of the code recording 10 is inclined with respect to the scanning direction of the reading sensor of the reading system 11, the order in which each pixel of the code recording 10 is written is different. May be read. in this way,
When each pixel is read in a different order, the data read and reproduced by the reading system 11 becomes different from the transmitted encoded document data.

As described above, in the apparatus of the prior art, unless the reading start position and the reading order are set strictly in the reading system 11, the encoded document data cannot be correctly read from the code recording 10. If the document data is not read correctly, the image reproduced in the reproduction recording 13 is significantly different from the image of the transmitted original document 3. This reduces the quality of the reproduced document. As described above, in the third conventional facsimile apparatus, it is difficult to reproduce the correct reproduction recording 13 from the transmission original 3 unless the storage method of the code recording 10 and the reading method of the reading system 11 are strict. Further, in the above-mentioned facsimile apparatus, the image printed and reproduced in the reproduced recording 13 is reproduced.
It is difficult for the receiver to confirm that the image is the same as that of the transmission original 3 by looking only at the reproduction / recording 13.

As a fourth conventional technique, Japanese Patent Laid-Open No.
Japanese Patent Publication No. 150160 is disclosed. Document data is transmitted to the facsimile apparatus of this publication from another facsimile apparatus, for example. In this document data, for example, each bit directly corresponds to the black display and the white display of the pixels of the recording paper when the image is printed. Therefore, if you print this document data as it is on the printing device,
The image of the transmitted document is printed on the recording paper. In the facsimile device of this publication, such document data is encrypted by the receiving facsimile device.

In the facsimile apparatus of this publication, the received record data, which is the document data, is demodulated by the modem and then encoded by a predetermined encoding method. As a result, the recorded information is encrypted. The encrypted record information is stored in, for example, a random access memory. Further, the record information stored in the random access memory is printed as it is on the recording paper. At this time, pixels for white display and black display are printed on the recording paper according to each bit of the encrypted recording information. As a result, the recording paper on which this recording information is printed becomes a so-called ROM type optical card.

[0018]

In such a facsimile machine, the encoding is performed by the facsimile machine on the receiving side. Therefore, on the public telephone line, the recorded information is transmitted in the data format of the same format as the normal mode which is a universal facsimile communication method. Therefore, when the data is mistakenly disclosed on the public telephone line or when the record information is transmitted to another facsimile machine due to the wrong destination, the information in the record information is recorded as it is in the normal mode. It is printed on paper and disclosed to third parties. Therefore, in such a method, the confidentiality of the communication content is lower than that in the confidential communication of the method shown in the third conventional technique.

Further, in the above-mentioned facsimile apparatus, when confidential information to be kept secret and public information that may be disclosed to a third party are mixed in one document data, these pieces of information are classified. Then, it is difficult to encode only one confidential information. Therefore, even when the data amount of confidential information included in the document data is small, all recording information is encoded. As a result, the amount of recorded information to be encoded is large.

An object of the present invention is to provide a facsimile apparatus that prints confidential document data while being encoded, reads the printed data again, and reproduces the confidential document data.
It is an object of the present invention to provide a facsimile device capable of performing confidential communication capable of surely reproducing an original confidential document even when a reading direction and an image direction are misaligned and tilted in reading by a reading system. .

[0021]

SUMMARY OF THE INVENTION The present invention is a facsimile communication apparatus comprising a transmitting side facsimile apparatus and a receiving side facsimile apparatus connected to the transmitting side facsimile apparatus via a public line. The apparatus divides the document surface of a transmission document into a plurality of transmission pixels of a predetermined size arranged in a matrix, optically reads the brightness of the document surface for each transmission pixel, and transmits the transmission pixels indicating the brightness. A transmission manuscript reading unit that generates transmission manuscript data, which is a collection of data, and a plurality of data units that respond to the output of the transmission manuscript reading unit and that cause the reception-side facsimile device to print a single print dot from the transmission manuscript data Display data generating means for generating configured display data, and a predetermined number of data units of the display data in response to the output of the display data generating means , (N × m) (n or m is an integer of 2 or more, and (n × m) is an integer equal to or greater than a predetermined number) from the print dots of the receiving side facsimile device. In accordance with the dot matrix of the minimum unit, the display data is converted into the coded data of a mode in which the reception side facsimile device prints the display data as a pattern shape composed of the dot matrix of the minimum unit. The receiving-side facsimile apparatus includes a receiving unit that receives the transmitted data, and a receiving-side facsimile apparatus that responds to an output from the receiving unit, and prints the data as a pattern shape composed of print dots on the original surface of the recording paper. To form a received document by printing the received document on the outside of the apparatus, and a document surface of the received document generated by the receive printing unit. It is a print pixel unit, and is divided into print pixel units of the same size as the print dots. The brightness of the document surface is optically read for each print pixel, and is a set of print pixel data indicating the brightness of each print pixel. A received document reading means for outputting certain received document data,
In response to the output of the received document reading means, the received document data is divided into a plurality of pixel data matrices each consisting of (n × m) print pixel data, and each pixel data matrix corresponds to the combination of the print pixel data. Decoding means for converting the predetermined number of data units to reproduce the display data,
A facsimile communication apparatus comprising: a document reproducing unit that reproduces transmitted document data from display data in response to an output of the decoding unit. According to the present invention, in the facsimile communication apparatus, the facsimile apparatuses on the transmitting side and the receiving side are connected via the public line. So-called confidential communication can be performed between the two facsimile devices.
In this confidential communication, a transmission manuscript in which confidential information is disclosed to only a sender and a receiver who have agreed in advance and confidential information is transmitted to a third party. In the transmitting side facsimile apparatus, first, an image of confidential information visually displayed on the document surface of the transmission document is converted into transmission document data by the transmission document reading means. In this reading means, first, the document surface of the transmission document is divided into a plurality of transmission pixels each having a predetermined size and arranged in a matrix. Next, the brightness of the document surface is optically read for each transmission pixel to obtain transmission pixel data indicating the brightness of each pixel. The transmission document data is an aggregate of transmission pixel data for each of a plurality of transmission pixels. This transmitted document data is given to the display data generation means. The display data generation means performs processing as will be described later on the transmission document data to generate display data. This display data is composed of a plurality of data units. Each data unit is data that can be printed with a single print dot on a recording paper by a reception printing unit of a reception-side facsimile device described later, and is, for example, 1-bit data. For example, the transmission pixel data described above is composed of one or a plurality of data units. The display data is given to the encoding means. The encoding means performs so-called image encoding processing. As a result, the basic unit group consisting of a predetermined number of data units of the display data is converted into a conversion unit group consisting of a predetermined number or more of data units according to the combination of the data units. The conversion unit group is a data unit group for printing (n × m) print dot matrices in the reception printing unit of the reception side facsimile device. Regarding the number of dots (n × m) of this print dot matrix, at least one of n and m is an integer of 2 or more, and the total number of (n × m) is larger than the number of data units of the basic unit group. Therefore, the encoded data obtained by image-encoding the display data is printed on the reception printing unit as a pattern configured with this dot matrix as the minimum unit. In this pattern, the number of dots is increased as compared with the virtual pattern in which the display data is printed as it is on the reception printing unit of the reception side facsimile device. The encoded data output from the encoding means is subjected to processing according to a facsimile transmission procedure such as compression processing and modulation processing by the transmission means, and then transmitted to the public line. The receiving side facsimile device receives the transmitted data from the public line by the receiving means. The receiving means performs processing such as demodulation processing and decompression processing on the received data according to the facsimile transmission procedure to obtain encoded data. The obtained encoded data is printed on the recording paper by the reception printing means. At this time, the reception printing unit changes the display form of each dot of the (n × m) print dots for each conversion unit group of the encoded data according to the combination of the data units included in the unit group, Print the pattern. For example, when the data unit is a bit that takes one of the states of "0" and "1" and the print dot is a dot that performs black and white display, the reception printing unit prints on the bit "0" or "1". Print the pattern by associating the white display and the black display of the dots. The recording paper on which the encoded data is visually displayed and printed is discharged as a received document outside the apparatus. The coded data has a completely different data unit structure from the display data due to the image coding process described above. Therefore, the coded graphic that is the visual display graphic of the coded data is completely different from the virtual visual display graphic of the display data. therefore,
It is extremely difficult to understand the confidential information from the visually displayed contents even if the received document is visually inspected. Therefore,
At the stage of printing the received document, confidential information can be kept secret from a third party. Further, it is not necessary to manage this received document so that it is not visible to the public. Further, in this method, since the received contents are recorded on the recording paper, there is no need for a memory for storing the received data for a long time. The received document is created by the same procedure as a general facsimile reception procedure. Therefore, the data transmitted in the confidential communication can be received without switching the facsimile machine on the receiving side to the special mode. The recipient of the confidential communication causes the receiving-side facsimile device to read the received original document again to reproduce the visual pattern of confidential information.
Only at this time, the receiving side facsimile apparatus is switched to the mode peculiar to confidential communication. First, the receiver causes the received document reading means of the facsimile apparatus to read the received document.
The reading unit divides the document surface of the received document into a plurality of print pixel units having the same size as the print dots and arranged in a matrix, and obtains print pixel data for each pixel. The display form of the print pixels corresponds to the state of each data unit of encoded data as described above. Therefore, as long as the original surface of the received original is not contaminated, the print pixel data has a state corresponding to the data unit corresponding to the state of each divided print pixel. For example, when the display form of the print pixel is either white display or black display, the print pixel data is either "0" or "1".
The received document data, which is a collection of print pixel data, is
It is given to the decryption means. In the decoding means, first, the received document data is divided into a plurality of pixel data matrixes each including (n × m) print pixel data. The divided pixel data matrix corresponds to a conversion unit group of code data. Next, the decoding means converts the print pixel data of the received document data into a basic unit group of the predetermined number of data units corresponding to the combination of the print pixel data for each pixel data matrix. As a result, the display data composed of these basic unit groups can be reproduced. The document reproducing means reproduces the transmitted document data from the reproduced display data. This transmission original data is visually displayed by, for example, being record-converted and printed on recording paper. In the above-mentioned reading means, there may be a deviation between the starting point of the arrangement position of the print dots printed on the receiving original and the starting point of the division of the print pixels depending on the installation state of the receiving original on the reading means. Further, the division direction of the print pixels may be inclined when viewed from the arrangement direction of the print dots. In the received document, one pixel of the display data corresponds to the (n × m) pixel matrix of the received document. Therefore, even when a part of the (n × m) pixel matrix is missing due to the above-described displacement and inclination, the display data that should correspond to the pixel matrix is based on the remaining pixels. Data unit groups can be inferred. Therefore, the display data can be surely image-decoded.

Further, the present invention is a facsimile communication apparatus comprising a transmitting side facsimile apparatus and a receiving side facsimile apparatus connected to the transmitting side facsimile apparatus via a public line, wherein the transmitting side facsimile apparatus is a transmission document. The original surface is divided into a plurality of transmission pixels of a predetermined size arranged in a matrix, and the brightness of the original surface is optically read for each transmission pixel, and is a set of transmission pixel data indicating the brightness. Display data composed of transmission document reading means for generating certain transmission document data, and a plurality of data units for responding to the output of the transmission document reading means and causing the facsimile apparatus on the receiving side to print a single print dot from the transmission document data. In response to the output of the display data generating means and the display data generating means, a predetermined number of data units of the display data are represented by (p × q (P or q is an integer greater than or equal to 2 and (p × q) is an integer greater than or equal to a predetermined number) A dot matrix of the minimum unit consisting of print dots of the receiving-side facsimile device. In accordance with the above, there is provided an encoding means for converting the display data into encoded data in a form for printing on the receiving side facsimile device as a pattern shape composed of the dot matrix of the minimum unit, and a transmitting means for transmitting the data to the public line. The receiving side facsimile device includes a receiving unit for receiving the transmitted data, and a minimum unit of (p × q) print dots for receiving the received data in response to the output from the receiving unit. Of the transmission data matrix to be printed, and each transmission data matrix is (n × m) (n and m are such that (n × m) is a number larger than (p × q), and p and m
A conversion means for converting a dot matrix composed of print dots of (≧ q or n ≧ p and m> q) into a display data matrix for printing, and a plurality of display data matrices in response to the output of the conversion means. The received data is printed on the document surface of the recording paper as a pattern shape composed of print dots to create a received document, and the received document is discharged to the outside of the apparatus. The original surface of the received original is divided into a plurality of print pixel units arranged in a matrix, each print pixel unit having the same size as a print dot, and the brightness of the original surface is optically read for each print pixel. ,
In response to the output of the received document reading unit that outputs the received document data that is a collection of print pixel data indicating the brightness of each print pixel, and the received document reading unit, the received document data is set to (n
× m) is divided into a plurality of pixel data matrixes each consisting of print pixel data, and the display data is converted into the predetermined number of data units corresponding to the combination of the print pixel data for each pixel data matrix. A facsimile communication apparatus comprising: a decoding unit for reproducing and a document reproducing unit for reproducing transmitted document data from display data in response to an output of the decoding unit. According to the present invention, the facsimile communication device can perform confidential communication between the facsimile devices on the transmitting side and the receiving side. In the transmission side facsimile apparatus, first, transmission document data is generated from the image of confidential information visually displayed on the document surface of the transmission document, and display data is generated from this transmission document data. The display data is image-encoded by the encoding means to generate encoded data for transmission. In the encoding means, the basic unit group consisting of a predetermined number of data units of display data is converted into a transmission data unit group for printing (p × q) print dot matrixes in the reception printing means of the reception side facsimile apparatus. To do. In the number of dots (p × q) of this print dot matrix, at least one of p and q is an integer of 2 or more, and is larger than the number of data units of the basic unit group. Furthermore, the number is smaller than the number (n × m) described later, and the numbers p and q are p <n and q ≦.
Either one of m, p ≦ n and q <m is satisfied.
The transmission encoded data is an aggregate of this transmission data unit group. The transmission encoded data output from the encoding means is subjected to processing according to a facsimile transmission procedure such as compression processing and modulation processing by the transmission means, and then transmitted to the public line. The receiving facsimile machine receives the encoded data for transmission transmitted via the public line. The encoded data for transmission is given to the conversion means after being subjected to processing such as demodulation processing and decompression processing according to the facsimile transmission procedure. In the conversion means, first the encoded data for transmission is
It divides into a transmission data unit group that causes the reception printing means to print a minimum unit dot matrix composed of (p × q) print dots. Next, each transmission data unit group is converted into a display data unit group for printing a dot matrix composed of (n × m) print dots. The display encoded data, which is a set of the display data unit groups, is given to the reception printing unit and printed on the recording paper. The encoded data for display is equivalent to the encoded data in the communication device according to the first aspect. The recording paper on which the encoded data is visually displayed and printed is discharged as a received document outside the apparatus. The coded data for display has a data unit structure that is completely different from that of the display data, and the coded graphic that is its visual display graphic is completely different from the virtual visual display graphic of the display data. Therefore, it is extremely difficult to understand the confidential information from this received document. Therefore, the confidential information can be concealed from a third party when the received document is printed. The recipient of the confidential communication causes the receiving-side facsimile device to read the received original document again to reproduce the visual pattern of confidential information. First, the receiver causes the received document reading means of the facsimile apparatus to read the received document, and obtains the received document data which is a set of print pixel data. This received document data is given to the decoding means. In the decoding means, first, the received original data is (n
× m) It is divided into a plurality of pixel data matrices each consisting of print pixel data. The divided pixel data matrix corresponds to a display data unit group of code data. Next, the decoding means converts the print pixel data of the received document data into a basic unit group of the predetermined number of data units corresponding to the combination of the print pixel data for each pixel data matrix. As a result, the display data composed of these basic unit groups can be reproduced. The document reproducing means reproduces the transmitted document data from the reproduced display data. This transmission document data is converted and printed, for example, on recording paper. Considering that the encoded data for transmission is virtually printed by the reception printing means of the facsimile apparatus on the receiving side, the virtual pattern of this data is configured with a print dot matrix of (p × q) print dots as a minimum unit. It becomes the pattern to be. In this virtual pattern, the number of dots is increased as compared with the virtual pattern in which the display data is printed by the reception printing unit of the reception side facsimile device. Further, in the coded data pattern transmitted by the communication device according to claim 1, the number of dots is smaller than that of the pattern formed by using the print dot matrix of (n × m) print dots as the minimum unit. is decreasing. Therefore, the facsimile communication device of the present invention can transmit confidential communication data with a smaller data amount than the facsimile communication device according to the first aspect. In the above-mentioned reading means, there may be a deviation and a tilt in the reading of the received document depending on the installation state of the received document in the means. Since one pixel of the display data is represented by a plurality of print pixels in the received document, even when a part of the (n × m) pixel matrix is missing, the pixel matrix is changed to the pixel matrix based on the remaining pixels. It is possible to analogize the data unit group of the display data to be supported. Therefore, the display data can be surely image-decoded. Further, when reproducing the display data, the minimum unit is a print dot matrix including a number of print pixels that is larger than the minimum unit of the encoded data for transmission. Therefore, compared with the case where the display data is reproduced using the image in which the encoded data for transmission is printed as it is, it is less likely to be affected by the deviation and the inclination. Further, since the encoded data for display has a different data unit configuration from the encoded data for transmission to be transmitted, it is created when the facsimile device in a state of receiving data containing only public information receives this data. The visual display contents of the received original are different from the visual display contents of the received original. Therefore, the received contents can be reliably reproduced only between the facsimile machines on the transmitting side and the receiving side. Therefore, the transmission content is more securely concealed.

Further, according to the present invention, the display data generating means includes an adding means for generating display data by adding predetermined additional data to the transmission original data in response to the output of the transmission original reading means. The reproducing means is characterized by including a separating means for separating the additional data and the transmitted original data from the display data in response to the output of the decoding means. According to the present invention, in the display data generating means of the transmitting side facsimile device, the addition means adds the predetermined additional data to the transmission original data to generate the display data. This additional data is data other than the transmission document data and is image-encoded together with the transmission document data.
The original reproduction means of the receiving side facsimile machine separates the additional data from the display data reproduced by the separation means. Therefore, this additional data can be kept secret from a third party and can be reliably reproduced from the received document. As the additional data, as will be described later, data other than the visual image on the visual display surface of the transmitted document or data necessary for controlling the data reproduction operation is selected. Since such data is transmitted together with the transmission document data, there is no need to separately transmit and receive these data between the facsimile machines on the transmitting side and the receiving side.

Further, according to the present invention, the transmission original document is composed of a plurality of individual original documents each having a document surface, and the transmission original document data is a plurality of data indicating a luminance of the original document surface of each sequentially read individual original document. The additional data, which is composed of individual manuscript data, is page data indicating the order in which the individual manuscript data is read by the transmission manuscript reading unit and the division of the individual manuscript data in the transmission manuscript data. The decoding means is characterized in that the display data is reproduced for each individual data unit divided by the page data. According to the invention, the transmission original includes a plurality of individual originals. Since each individual manuscript has its own manuscript surface, the transmission manuscript reading means generates individual manuscript data which is image data of a visual figure written on the manuscript surface for each individual manuscript. The transmitted document data is a set of these individual document data, and is composed of pixel data of pixels of each individual document. The additional data described above is page data indicating the reading order of these individual document data and the division of each individual document data. The decoding means of the receiving side facsimile machine decodes in units of individual document data whose division is indicated by page data, and reproduces the display data. As described above, in the encoding means of the transmitting side facsimile device,
The data is image-encoded so that one pixel of the visual figure of the transmission original corresponds to a plurality of pixels of the encoded figure of the reception original.
As a result, the data amount of encoded data is (n × m) times the data amount of display data. Therefore, the encoded data of each individual original of the transmission original may be visually displayed over a plurality of pages in the reception original. The decoding means of the receiving side facsimile machine divides the individual manuscript data on the basis of page data to perform image decoding. As a result, regardless of the number of pages of the received original, the original data of the original having the same number of pages as the transmitted original can be reliably reproduced.

In the present invention, the transmission side facsimile apparatus further includes detection signal generation means for generating an error detection signal for inspecting a transmission error of the transmission document data in response to the output of the transmission document reading means. The additional data is an error detection signal, and the reception side facsimile apparatus responds to the output of the separating means, and uses the error detection signal to detect the difference between the reproduced transmission original data and the transmission original data before transmission. When there is a difference in the reproduced transmission original data in response to the output of the error detecting means and the error detecting means for inspecting whether or not the error has occurred, the fact is presented to the user of the facsimile apparatus on the receiving side. It further comprises a receiving side error display means. According to the invention, the additional data is an error detection signal for detecting a transmission error of the transmission original data. This error detection signal is the same as the error detection signal added to the digital signal, and is realized by, for example, a CRC code. In the transmission side facsimile apparatus, the detection signal generation means generates an error detection signal based on the transmission document data output from the transmission document reading means. This error detection signal is added to the transmission document data, and together with it is image-encoded and transmitted to the public line.
The facsimile machine on the receiving side performs image decoding on the coded data received from the public line, and then separates the error detection signal by the separating means. The error detection means uses this error detection signal to determine whether or not there is a difference between the reproduced transmission original data and the transmission original data before transmission.
In this manner, the receiving side facsimile device performs error checking using the error detecting code to judge whether or not the data is correctly received. When there is a difference between both data,
It is judged that the data is not received correctly due to poor reception. At this time, the receiving-side facsimile device does not generate a reproduced document, and the receiving-side error display means presents the fact to the receiver. As a result, the receiver can confirm whether or not the visual image of the transmission document is correctly reproduced on the reproduction document reproduced by the reception side facsimile device. For example, due to noise on the public line and poor conversion of each component of the transmitting and receiving devices,
When the data transmission / reception becomes defective, it can be surely determined whether the received data is correct or not.

Further, according to the present invention, the transmission side facsimile device is transmitted from the transmission side facsimile device and a detection signal generating means for generating an error detection signal of the transmission document data in response to the output of the transmission document reading means. The transmission side error display means for indicating to the user that there is a difference between the transmission original data and the transmission original data reproduced by the receiving side facsimile apparatus, wherein the additional data is an error detection signal. The receiving-side facsimile apparatus has a plurality of pixel units arranged in a matrix on the document surface of the received document before the document is discharged by the reception printing unit, and has the same size as a print dot. It is divided into print pixel units, the brightness of the document surface is optically read for each print pixel, and the confirmation document data is a collection of print pixel data indicating the brightness of each print pixel. And confirmed the original reading means for outputting,
In response to the output of the confirmation document reading means, the confirmation document data is divided into a plurality of pixel data matrices each consisting of (n × m) print pixel data, and each pixel data matrix corresponds to the combination of the print pixel data. Converting into a predetermined number of data units and reproducing the display data by using a confirmation decoding means and an error detection signal separated from the display data in response to the output of the confirmation decoding means. Difference between the transmitted original data to be reproduced in response to the output of the confirmation error detecting means for checking whether or not there is a difference between the transmitted original data and the transmitted original data before transmission. When the occurrence of the error occurs, it further comprises a presenting means for displaying the fact on the transmitting side error display means of the transmitting side facsimile apparatus via the public line. According to the invention, the additional data is an error detection signal. In the receiving-side facsimile apparatus, immediately after the received document is created by the reception printing unit and before the document is ejected, the document surface of the received document is read and scanned by the confirmation document reading unit, and the confirmation document data which is the image data of the encoded graphic Is generated. The confirmation document data is image-decoded by the confirmation decoding unit to separate the error detection code, and the confirmation error detection unit inspects the transmission document data before and after the transmission for a difference. When it is determined in the error check that there is a difference, the receiving side facsimile device presents the fact to the transmitting side facsimile device through the public line. In the sending side facsimile apparatus, the sending side error display means indicates to the sender that the sending has failed due to a difference between the data before sending and the data after receiving.
As described above, in the facsimile communication apparatus of the present invention, the error check of the received data is performed immediately after the reception. In the facsimile communication apparatus of the present invention, the reproduction operation for reproducing the transmission document data from the reception document may be performed at any time, and is not always performed immediately after the data transmission. In this way, by reading the content of the received document before it is discharged, the error check can be performed immediately after the transmission without the need for the receiver to read the received document. Further, when a difference is detected by the error check and the transmission is unsuccessful, the fact is notified to the sender, so that the sender can take measures such as retransmission. Therefore, the data can be surely transmitted.

According to the present invention, the transmitting means of the transmitting side facsimile device transmits the display data output from the display data generating means to a public line, and the receiving side facsimile device responds to the output of the receiving means. Then, the predetermined number of data units of the received data is (n × m) (n,
One of m is an integer of 2 or more, and (n ×
m) corresponds to a dot matrix of a minimum unit of an integer number equal to or larger than a predetermined number) print dots, and the reception printing unit prints as a pattern shape composed of the dot matrix of the minimum unit. Receiving side encoding means for converting into encoded data, and in response to the output of the receiving side encoding means, predetermined additional data is added to the receiving side encoded data to generate print data, which is output to the printing means. The receiving means further includes a generating means and a switching means for switching whether or not confidential recording is performed when the data is received, and the receiving means responds to the output of the switching means and receives the received data only when performing the confidential recording. It is characterized in that it is given to the encoding means.
According to the present invention, in the receiving side facsimile device, when the sender side transmits the display data including the public information which may be disclosed to the third party in a non-encoded state, this data is similar to the confidential communication. In addition, it is possible to perform confidential recording that is received in the form of being concealed from a third party. This confidential recording is performed, for example, only when the state of the device is switched by the switching means. In the reception side facsimile apparatus, when the confidential recording is performed, the reception side output means outputs the received data to the image encoding side by the reception side encoding means, the generation means adds the additional data, and the printing means prints the data. The operation described above is the same as the operation of converting data in the facsimile machine on the transmission side of confidential communication. Through such processing, all data transmitted from unspecified senders can be treated as confidential information.

According to the present invention, the transmitted original document includes a confidential information area in which contents to be confidentially transmitted are visually displayed, and a public information area in which contents not to be confidentially transmitted are visually displayed. The transmission original reading means of the transmission side facsimile device includes a dividing means for dividing the confidential information area and the public information area of the transmission original, and the data showing the visual display contents of the public information area of the transmission original data is directly transmitted to the transmission original data. Means for transmitting to the receiving side facsimile device, the received document reading means of the receiving side facsimile device includes a dividing means for dividing a confidential information area and a public information area of the received document, and the confidential information of the received original data is included. It is characterized in that only the data showing the visual display contents of the area is given to the decoding means. According to the present invention, confidential information and public information are mixed and visually displayed on the transmitted document. In the facsimile communication apparatus of the present invention, only confidential information among these pieces of information is transmitted by the confidential communication method. The document reading unit of the sending facsimile machine divides a confidential information area in which confidential information is described and a public information area in which public information is described. The data as a result of reading the confidential information is converted into display data by the display data generating means, image-encoded by the encoding means, and then given to the transmitting means for transmission. The data that is the result of reading the public information area is transmitted from the transmission means as it is. The document reading means of the facsimile machine on the receiving side also divides the confidential and public information areas,
Only the result of reading the confidential information area is image-decoded. Thereby, for example, the address and the address of the transmission destination of the transmission document can be added to the document as public information. On the receiving side, the recipient and the address printed on the received document can be visually checked to easily identify the recipient of the received document. Further, as described above, the encoded data transmitted by confidential communication has a larger data amount than the display data. Therefore, by treating all parts of the same document other than those that must be concealed by a third party as public information, the amount of data to be transmitted can be reduced compared to when all the contents are transmitted as confidential information. .

[0029]

1 is a block diagram showing an electrical configuration of facsimile machines 21 and 22 according to a first embodiment of the present invention. FIG. 2 shows a facsimile device 2 of FIG.
It is a schematic diagram which shows the confidential communication performed between 1 and 22. 1 and 2 will be described together.

The facsimile device 21 is a device on the transmitting side, and the facsimile device 22 is a device on the receiving side. The facsimile machines 21 and 22 are connected via the public telephone line 23. So-called confidential communication can be performed between the facsimile devices 21 and 22.

When performing confidential communication, the facsimile device 2
The sender who is the user of 1 causes the facsimile device 21 to read the transmission original document 26 to be transmitted. The visual display surface on which the image of the transmission document 26 is printed includes a public information area 27 and a confidential information area 28.

In the public information area 27, public information that may be known to a third party is visually displayed. This public information is, for example, the destination of the recipient who should receive the transmitted document and the name of the sender who transmits the transmitted document. Confidential information area 2
In 8, the confidential information that is disclosed only to the sender and the recipient and is hidden to a third party is visually displayed.

In the areas 27 and 28 of the transmission document 26, public information and confidential information are visually displayed, for example, in the form of characters and figures, respectively. What is a character?
It includes concepts such as kanji, kana, numbers, Western characters, symbols, pictograms. With such characters and figures, public information and confidential information can be stored in the areas 27 and 28.
Is visually displayed in a form that allows the contents to be obtained by glancing at. A person who looks at the visual display surface of the transmission document 26 can understand the public information and the confidential information by any of the sender, the receiver, and a third party. A figure represented by a character or the like in this manner is referred to as a visual figure 29. For example, in the public information area 27, characters of “addressee”, “sender”, and “other public information” are described as visual figures 29. Further, in the confidential information area 28, a character of “confidential information” is described as a visual figure 29.

The facsimile device 21 uses the transmission original 2
The visual display surface 6 is read, and the images visually displayed in the areas 27 and 28 are converted into transmission data. The transmission data 30 is transmitted to the facsimile machine 22 on the receiving side via the public telephone line 23. In this transmission data, the electric signal obtained by converting the image of the confidential information area 28 is further encrypted and image-encoded as described later, and converted into data showing an image of a different form from the visual figure 29.

The virtual image 31 is a virtual image showing a state in which the transmission data is imaged as it is. Hereinafter, the image surrounded by the alternate long and short dash line in FIG. 2 represents a virtual image in which the electrical signal is virtually visually displayed. In the virtual image 31 of the transmission data 30, the public information is visually displayed as a visual figure 29 in the public information area 27. In the confidential information area 28,
The confidential information is visually displayed as the coded graphic 32. The coded graphic 32 is a graphic that is completely different from the visual graphic 29.

The reception side facsimile device 22 receives the reception data 34 from the public telephone line 23. The reception data 34 and the transmission data 30 are the same electric signal if transmission and reception are performed without error, and show the virtual image 31 of the transmission data 30. The facsimile device 22 prints the received data 34 on a recording sheet, visually displays it, and displays the received original 35.
Create The image visually displayed on the visual display surface of the received document 35 has the same form as the virtual image 31 described above, and the confidential information in the confidential information area 28 is displayed in the form of the coded graphic 32.

The recipient, who is the user of the receiving side facsimile device 22, causes the facsimile device 22 to read the received document 35 again. The data read from the received document 35 is subjected to the processing described later in the facsimile device 22 to generate reproduced data 37. In the virtual image of the reproduction data 37, the confidential information in the confidential information area 28 is shown as a visual figure 29. That is, the reproduction data 37 corresponds to the data at the stage when the transmission original document 26 is read by the transmission side facsimile device 21. The facsimile device 22 records and converts this reproduction data, prints it on recording paper, and visually displays it to create a reproduction document 38. On the visual display surface of the reproduction original 38, the same image as the transmission original 26 is visually displayed. That is, the confidential information is displayed in the confidential information area 28 as a visual figure 29 that can be visually displayed and understood.

The detailed electrical construction of the facsimile apparatus 21 on the transmitting side will be described below.

The transmission document 26 is read by the reading device 41. The transmission document 26 is composed of, for example, one or a plurality of documents each having a visual display surface. For example, the reading device 41 divides the visual display surface of the transmission document 26 into pixels having a predetermined size. The pixels are preferably arranged in a matrix, for example, parallel to the horizontal direction x and the vertical direction y. The reading device 41 sequentially scans each pixel, and detects the brightness indicated by the shade of the image included in each pixel. As a detection method, for example, the pixels of the transmission original 26 are irradiated with light, and the reflected light is received by the electron tube and the photoelectric conversion element. The electron tube and the photoelectric conversion element derive an electric signal having a level according to the amount of received light. By such a method, the image displayed on the visual display surface of the transmission document 26 is converted into an analog electric signal.

In the reading device 41, the visual display surface of the transmission original 26 is scanned in raster order, for example, and converted into an electric signal of an image drawn on the reading surface. The raster order is, for example, the order of sequentially scanning a two-dimensional plane with the horizontal direction x as the main scanning direction and the vertical direction y as the sub-scanning direction. For example, when there are a plurality of transmission documents 26, the reading device 41 described above generates image data of each document in the order in which each document is read. The reading device 41 also generates page data. The page data is data indicating the number of originals of the transmission original 26 including a plurality of originals and the number of originals in the reading order of each image data. These data are converted into image data of digital signals by, for example, an analog / digital conversion circuit, and then the image data compression circuit 4
Given to 3.

The image data compression circuit 43 compresses the given image data by a predetermined compression method. When the transmission document 26 is composed of a plurality of documents, the image data compression circuit 43 compresses the image data of each document individually or collectively. As a result, the amount of the generated compressed image data is smaller than that of the image data output from the reading device 41.

Further, in the compression circuit 43, the compression rate may be changed according to the type of the image of the transmission original 26 to be transmitted, as described later. For example, the transmitted document 26
When the image is a natural image such as a natural image with a small gradation difference, the compression rate is lowered. If the image of the transmission document 26 is a character or a simple line drawing, the compression rate is increased. The amount of compressed image data differs depending on the compression rate. The compressed image data from the image data compression circuit 43 is given to the encryption circuit 44.

The encryption circuit 44 encrypts the given compressed image data based on the encryption key. The sender inputs this encryption key from the operation device 46, for example.
This operating device is, for example, a keyboard. The input encryption key is sent to the encryption circuit 44 via the control circuit 47.
Given to.

The above-mentioned compressed image data is given to the encryption circuit 44, and page data is given from the reading device 41. The encryption circuit 44 regards the page data and the compressed image data as a single data to be transmitted in a batch, and encrypts them based on a predetermined encryption method. When it is considered that the compressed image data encrypted in this way is temporarily imaged by the reception side facsimile device 22, the virtual image of this data shows a completely different pattern from the visual image 29.

This encryption method is, for example, a method using so-called exclusive OR. When using this technique,
The encryption circuit 44 generates a pseudo random number using the given encryption key as a seed. With this pseudo-random number,
The exclusive OR of the compressed image data and the page data is calculated and obtained, and the calculation result is output as encrypted data. The encrypted data includes encrypted compressed image data and encrypted page data. This encrypted data is given to the error detection code generation circuit 49.

The error detection code generation circuit 49 generates an error detection code for encrypted data. This error detection code is
It is used when the receiving side facsimile device 22 determines whether or not the received data received is correct. As this error detection code, for example, CRC (Cycl
ic Redundancy Code) code is used. In the CRC code, the data is treated as a series of binary numbers, the data is divided by a generator polynomial, and the error is taken as a redundant bit. This redundant bit is added to the data as a CRC code.

The CRC code generation method will be described below.

For example, the generator polynomial G (X) is a polynomial of degree m. When the original encrypted data to which the CRC code should be added is P (X) and the encrypted data to which the CRC code is added is F (X), a quotient Q (X) and a remainder R (X) satisfying the following expressions To calculate. The following expressions are all binary expressions.

X ^m · P (X) = Q (X) · G (X) + R (X) (1) Further, the data F (X) to which the CRC code is added is expressed by the following formula. .

F (X) = X ^m · P (X) + R (X) = Q (X) · G (X) (2) For example, the generator polynomial G (X) is A method for calculating and generating a CRC code when the data P (X) is "1001 0110" is shown below.

G (X) = X ⁶ + X ⁴ + X ² +1 (3) The highest order of the generator polynomial G (X) is “6”.
The above-mentioned data P (X) is expressed by the following polynomial.

P (X) = X ⁷ + X ⁴ + X ² + X (4) First, the error detection code generation circuit 49 uses the original data P
(X) is multiplied by the highest-order term of the generator polynomial G (X).

X ^m · P (X) = X ⁶ · P (X) = X ¹³ + X ¹⁰ + X ⁸ + X ⁷ (5) Then, this multiplication result X ^m · P (X) is generated as a generator polynomial G.
Divide by (X).

[0054]

[Equation 1]

The remainder R (X) generated as a result of this division is used as a CRC code.

R (X) = X ³ + X ² + X +1 (7) The error detection code generated in this way is supplied to the image coding circuit 50. The image coding circuit 50 is supplied with the encrypted data from the encryption circuit 44. The image encoding circuit 50 first adds an error detection code to this encrypted data. If the error detection code is the above-mentioned CRC code, the encrypted data F (X) to which the error detection code is added is expressed by the following equation.

F (X) = X ^m · P (X) + R (X) = X ¹³ + X ¹⁰ + X ⁸ + X ⁷ + X ³ + X ² + X + 1 (8) The data represented by this formula is “1001 0110 1
The bit string is "111". The image encoding circuit 50 image-encodes the encrypted data to which the error detection code is added, and then converts the data into an optically readable code form to generate transmission data. The optically readable code is, for example, a bar code. Also,
Besides the barcode, a matrix code and a two-dimensional barcode may be used.

By image-encoding the data, the pixel data corresponding to one pixel of the virtual image of the encrypted data is associated with a plurality of pixels. As a result, one pixel of the virtual image of the encrypted data described above is represented by a plurality of pixels in the virtual image 31 and the image of the received document 38. At this time, one pixel of the virtual image of the encrypted data is orthogonal to the virtual image 31 and the received document 38 in the vertical and horizontal directions y and x.
Of the (N × M) pixels arranged in a matrix in parallel with, it is preferable to be represented by orthogonal (n × m) pixels. The number of pixels is, for example, (4 × 4)
Individual.

Further, pattern data of the reference pattern is inserted into the encoded data every data of a predetermined number of pixels. This reference pattern indicates the position that serves as the reading reference of the coded graphic 32 when the reception original 35 is read by the reception side facsimile device 22. In this way, the data obtained by adding the pattern data of the reference pattern to the encoded data of the encrypted data to which the error detection code is added is output from the image encoding circuit 50 as encoded data. When this coded data is visually displayed, it becomes a coded figure 32 visually displayed in the confidential information area 28 in the virtual image 31 and the received document 35 of FIG. 2 described above. That is, the encoded data is
It is image data showing the coded graphic 32.

FIG. 3 is a diagram showing a detailed structure of the coded graphic 32. In the encoded figure 32, a code in which one pixel of the virtual image of the encrypted data is represented by (5 × 5) pixels of the image of the received document 38 is added to the encrypted data to which the error detection code is added. Has been made. The reference pattern 52 of the coded figure 32 of the present embodiment is a pattern represented by (5 × 5) pixels, and the peripheral and central pixels of the (5 × 5) pixels are displayed in black. Yes, and the other pixels have a grid-like pattern represented by white display.

The coded figure 32 in FIG. 3 is a virtual image of encrypted data consisting of (10 × 7) pixels {(5 × 1
It is represented by 0) × (5 × 7)} pixels. In this coded figure 32, there are three pixels in which {5 × (5 × 2)} data pixels are interposed between {(5 × 2) × (5 × 7)} data pixels. {5 × (5 × 7)} pixels including the reference pattern 52 are inserted. As a result, the reference pattern 52 in the encoded figure 32 is parallel to the horizontal direction x at every (5 × 2) pixels and in the vertical direction y.
Appear every (5 × 2) pixels in parallel with.

As described above, the pixels of the virtual image of the encrypted data are represented by the pixel pattern 53 having (n × m) pixels as the minimum unit pattern. Therefore, the virtual image of the encrypted data divided by (r × s) pixels is [(n ×
r) × (m × s)] pixels are converted into an encoded figure 32.

The encoded data generated by the image encoding circuit 50 is given to the transmitter 56. The transmitter 56 is
It is a so-called modem. For example, when the transmission document 26 includes the public information area 27, the transmission device 56 receives image data of the public information displayed in the public information area 27 from the reading device 41 via the control circuit 47.
The transmission device 56 combines the encoded data and the public image data, which is the image data of the public information, with the transmission original 2
6 to generate transmission data.

The transmission data is constructed by sequentially arranging the open image data and the encoded data in the order displayed on the transmission original 26. For example, in FIG.
As shown in the transmission manuscript 26, the two public information areas 27
When the original has a configuration in which the confidential information area 28 is interposed between the two, the public image data of the first public information area 27, the encoded data, and the public image data of the second public information area 27 are arranged in this order. , Are arranged in the order of reading.

The transmission data thus generated is subjected to compression processing according to a predetermined facsimile transmission method and then modulated by a predetermined modulation method. Further, the transmission device 56 performs network control processing and line control processing to connect the facsimile device 21 and the public telephone line 23, and outputs the modulated transmission data to the public telephone line 23. This transmission is performed according to a standard based on the recommendation of the International Telegraph and Telephone Consultative Committee (CCITT), for example. In this way, the transmission document 26 is converted into the transmission data 30.
Sent as

The facsimile device 21 is also provided with an image memory 57 and a memory 58. For example, the image memory 57 stores the image data read by the reading device 41 and the data generated by the circuits 43, 44, 50. The memory 58 includes, for example, the reading device 41.
The page data output from and the error detection code generated by the error detection code generation circuit 49 are stored. These memories 57 and 58 temporarily store the read image data when there is a difference between the reading speed of the transmission original document 26 in the reading device 41 and the signal processing speed in the circuits 43, 44, 49 and 50, for example. Used to store. Further, when the transmission document 26 includes the public information area 27 and the confidential information area 28, the public image data and page data in the public information area 27 are temporarily stored while the image data in the confidential information area 28 is being processed. It is used to store the data.

In this way, the transmission side facsimile apparatus 2
1 transmits a transmission document 26 including confidential information.

The detailed structure of the receiving side facsimile device 22 will be described below.

The reception side facsimile device 22 performs a reception mode and a reproduction mode. In the reception mode, the transmission data transmitted through the public telephone line 23 is received as reception data, recorded and converted as it is, and visually displayed.
In the reproduction mode, the visual information 29 of confidential information is reproduced from the coded graphic 32 of confidential information described above. The facsimile device 22 is normally set to the reception mode.

The operation in the reception mode will be described below. The facsimile device 22 is connected to the public telephone line 23 via the receiving device 61. The receiving device 61 is a so-called modem. The receiving device 61 performs network control processing and line control processing and is connected to the public telephone line 23.
The transmission data transmitted via the line 23 is received. The receiving device 61 obtains received data by performing demodulation processing and decompression processing of this transmission data based on a predetermined facsimile transmission method. This receiving operation is performed in accordance with the standard based on the recommendation of the International Telegraph and Telephone Consultative Committee (CCITT), for example. The obtained reception data is given to the printing device 62.

In the printing device 62, the received data is recorded and converted by a predetermined method and printed on recording paper. The printing device 62 is, for example, a thermal transfer type line printer, and according to a combination of bits “1” and “0” of received data,
A pattern composed of a combination of white display pixels and black display pixels is printed on a recording paper. As a result, the received document 35 is created. The received document 35 has a public information area 27.
The public information is displayed in the form of a visual graphic 29, and the confidential information is displayed as a coded graphic 32 in the confidential information area 28. In this reception mode, the same operation as that of the conventional facsimile machine is performed. Therefore, the received manuscript can be created by receiving the data including only the public information.

The receiver switches the facsimile device 22 to the reproduction mode and creates the reproduction document 38 from the reception document 35. The reproduction mode is performed, for example, only when the user operates the operation device 64 to give an instruction. The detailed operation of the facsimile device 22 in the reproduction mode will be described below.

The receiver causes the reading device 66 to read the generated received document 35. The reading device 66 has the same configuration as the reading device 41 of the transmitting-side facsimile device 21, and photoelectrically converts the image visually displayed on the visual display surface of the received document 35 to generate image data. This reading device 66
Then, for example, in the raster order in which the horizontal direction x of the visual display area of the received document 35 is the main scanning direction and the vertical direction y is the sub-scanning direction, it is received in pixel units of the same size as one pixel of the encoded figure 32. The visual display surface of the original 35 is scanned. As a result, the visual display surface of the received document 35 is read and image data is generated. This image data corresponds to the encoded data that has been transmitted if the reception by the facsimile device 22 has succeeded. The generated image data is given to the image decoding circuit 67.

The image decoding circuit 67 decodes the encoded data given as the image data to reproduce the encrypted data. In the image decoding circuit 67, for example, the image data of the coded figure 32 including (N × M) pixels is divided into a pixel group including (n × m) pixels. As a result, the image data is divided into (r × s) pixel groups.

When dividing pixels in this way, the image decoding circuit 67 detects the reference pattern 52 from the image,
Pixels are divided based on the arrangement of the reference pattern 52. For example, as shown in FIG. 3, when the image data is read from the pixels in the row parallel to the horizontal direction x indicated by the arrow A, the reference point of the division of the pixels in the vertical direction y is indicated by the arrow B. Set to the line. Further, when the image is scanned and read in an oblique direction such that it intersects the horizontal direction x and the vertical direction y, pixels are sectioned based on the arrangement direction of the reference pattern 52.

As described above, when the coded figure 32 includes the reference pattern 52, the receiving side facsimile device 22
Even when the coded figure is scanned and read in the direction different from the direction of the pixel array in the reading device 66, the decoding process can be correctly performed. Image decoding circuit 6
The decoded data decoded in 7 is supplied to the error checking circuit 68.

The error checking circuit 68 checks whether or not the received data received by the facsimile device 22 correctly corresponds to the original transmitted data. For example, when a CRC code is used as the error detecting code, the error checking circuit 68 causes the decoded data to generate the above-mentioned generator polynomial G.
Divide by (X). For example, when the decoded data output from the image decoding circuit 67 is the encrypted data F (X) to which the error detection code generated by the above-mentioned transmission side facsimile device 21 is added, this data F (X ) Is divided by the generator polynomial G (X), the remainder R (X) of the division result becomes 0.

[0078]

[Equation 2]

As described above, when the CRC code is used, when the remainder of the division result is 0, it is determined that the data has no error. The decrypted data determined to be correct by the error check circuit 68 is supplied to the decryption circuit 69.

The decryption circuit 69 decrypts the decrypted data based on the decryption key. In the decryption circuit 69, the encryption circuit 4 of the sending side facsimile device 21 is used.
Decryption is performed based on the same encryption method as in 4. For example, since the above-described encryption circuit 44 performs the encryption process using the exclusive OR, the decryption circuit 69 also performs the decryption process using the exclusive OR. For example, the decryption circuit 69 generates a pseudo random number using the decryption key as a seed. The exclusive OR between the pseudo random number and the decrypted data is calculated, and the result of this operation is used as the decrypted data. The decrypted decrypted data is provided to the image data restoration circuit 73.

This decryption key is sent by the receiver to the operation device 6
4 to the facsimile device 22. Operating device 64
Has the same configuration as the operation device 46 of the facsimile device 21. The decryption key input from the operation device 64 is given to the decryption circuit 69 via the control circuit 71. If the seeds are the same, the pseudo-random numbers generate random number values in the same series. Therefore, if the information of the encryption key and the decryption key is exchanged between the sender and the receiver, the decryption circuit 69 can properly decrypt the encoded data.

The image data restoration circuit 73 expands the decoded data by a predetermined method and reproduces the transmitted image data. The reproduced image data that has been reproduced is record-converted and printed on recording paper. As a result, the reproduced document 38 is created. In the public information area 27 and the confidential information area 28 of the reproduced document 38, the public information and the confidential information are displayed in the form of visual graphics 29, respectively. In this way, the reproduction facsimile 38 can be reproduced from the reception original 35 in the reception side facsimile device 22.

Further, the receiving side facsimile device 22 has
An image memory 75 and a memory 76 are provided. The image memory 75 stores received data, image data read by the reading device 66, and image data processed by the circuits 67 to 69 and 73. The memory 76 includes page data output from the reading device 66 and the operating device 6, for example.
The decryption key input from 4 is stored. These memories 75 and 76 are used to temporarily store data when, for example, the processing speed of a signal in a certain constituent element is faster than the processing speed of a constituent element on the signal flow downstream side of the constituent element.

In this way, the receiving side facsimile apparatus 2
In 2, the transmission data including confidential information can be received, and the encrypted confidential information can be decrypted to obtain the visual pattern 29 of the confidential information.

Further, as described above, the transmission side facsimile device encrypts and transmits the transmission original data, and the reception side facsimile device decrypts the reproduced display data to reproduce the original data. As a result, the transmission contents are kept secret to a third party other than the person who knows the encryption key and the decryption key. Therefore, for example, when data is leaked from the public line or when the received document is lost,
If you do not know the decryption key, you cannot obtain the transmitted document data. Therefore, the confidentiality of the transmitted data can be improved.

The above-mentioned transmission side facsimile device 21 converts the confidential information displayed in the confidential information area 28 into encoded data and then transmits the encoded data. The coded figure 32 in which this coded data is visually displayed has a larger number of pixels than the visual figure 29 in the original confidential information area 28. That is,
When the original image data and the encoded data are compared, the maximum amount of encoded data is (n × m) times the original data. Therefore, the amount of data to be transmitted increases. Therefore, in the transmission side facsimile device 21, it is preferable that the image data compression circuit 43 compresses the original image data as much as possible to reduce the data amount. Also,
The compressed image data has a data structure different from that of the original image data. In the virtual image in which the compressed image data is visually displayed, each pixel does not correspond to the pixel of the original image in a one-to-one relationship, and becomes an image different from the original image. Therefore, by compressing the data, the confidentiality of the transmitted document data can be improved.

At this time, for example, the image data compression circuit 4
The data compression rate in 3 differs depending on, for example, the type of visual figure to be compressed. For example, when the visual figure 29 is an image with a small gradation difference such as the natural image shown in FIG. 4A, the data compression rate of the compression circuit 43 becomes small. In such a case, the visual figure 29 drawn in the visual area of the single transmission original 26 is converted into the encoded data of the encoded figure 32 corresponding to two originals. Further, when the visual figure 29 is an image such as the simple line drawing and character shown in FIG. 5A, the compression rate of the data in the compression circuit 43 can be increased. At this time, for example, the image data of the image drawn in the visual area of the two transmission originals 26 is set as encoded data that can be drawn in the visual area of a single original. As a result, the encoded data at the time of transmission includes the encoded data of the transmission originals of the two originals in a single original. As described above, in the facsimile apparatus of this embodiment, the number of originals at the time of transmission changes according to the image to be transmitted as confidential information.

FIG. 6 is a flow chart for explaining the document transmitting operation in the transmitting side facsimile device 21. For example, when the power is turned on, the process proceeds from step a1 to step a2. At step a2, the sender places the transmission document 26 on the document mounting table of the reading device 41 so that the device 41 can read it. Further, the encryption key is input from the operation device 46. With the original placed and the encryption key input, the sender gives an instruction to start transmission from the operation device. The control device 47 responds to a transmission start instruction from the operation device 46, and the other components 4 of the facsimile device 21.
1, 43, 44, 49, 50, 56 to 58 are controlled.
When the start of transmission is instructed, steps a2 to a
Proceed to 3.

At step a3, the control circuit 47 sets the page counter to an initial value. This initial value is "1", for example. When the page counter is set, the reading device 41 draws any one of the transmission documents 26 placed on the placing table into the device and scans its visual display surface to perform photoelectric conversion. .

The confidential information area 28 is the entire visual display surface scanned from the start point to the end point of the confidential information area 28 input from the operating device. This confidential information area 2
The start point and the end point of 8 are input by the user from the operation device 46, for example. That is, the points scanned by the reading device 41 when a predetermined key of the operation device 46 is operated are set as the start point and the end point of the confidential information area 28, respectively. For example, the user observes that the visual display surface of the transmission document 26 is sequentially read by the reading device 41. When the reading device 41 attempts to scan the confidential information area 28, the start point of the confidential information area 28 is set using the operation device 46. The same operation sets the end point.
Further, in the confidential information area 28, a predetermined code is added to the start point and the end point of the area 28 on the visual display surface of the document in advance,
The reading device 41 may be configured to read the code.

When the reading of the original is started, step a
From 3 to step a4. In step a4, the control circuit 47 determines whether or not the point currently scanned by the reading device 41 is included in the confidential information area 28. For example, after the start point is input from the operation device 46,
It is determined that all the scanned points until the end point is input are included in the confidential information area 28. That is, in the control circuit 47, for example, when the start point of the confidential information area 28 is input, the point scanned after that is set to the confidential information area 2
Considered as point 8. This judgment state is maintained until the end point of the confidential information area 28 is input. When the end point is input, this state is released, and the point to be scanned thereafter is the public information area 2
It is determined to be included in 7.

When it is determined in step a4 that the current scanning point is included in the confidential information area 28, the process proceeds from step a4 to step a5. In step a5, the image in the confidential information area 28 of the document is read by the reading device 41, and the image data is output. From step a5 to step a6,
The image data read by the image data compression circuit 43 is compressed to generate compressed image data. This compressed image data is stored in the image memory 57.
Then, the process proceeds from step a6 to step a7.

In step a7, the coded image data size M is determined. The data size M is determined based on the size of the transmitted image already output to the public telephone line 23 and the size of a single original of the received original 35. For example, the size of the single visual display surface of the recording paper to be the received document 35 is L1 and the size of the transmitted area necessary for displaying the already transmitted image is L2. If the size of the unused area that has not yet been used for transmission is L3, the size L1 of the visual display surface of a single recording sheet is expressed by the following equation.

L1 = L2 + L3 (11) Therefore, the size L3 of the unused area can be obtained from the size L1 of the visual display surface of a single recording sheet and the size L2 of the transmitted area. . The encoded data transmitted in the operation after this step is visually displayed in the unused area of this recording paper. Therefore, in order to obtain the data size M, first, the maximum image coded data size N is obtained. The data size N is the data amount of the coded data of the maximum coded image that can be recorded in the unused area of the size L3.

Next, the sum of the data amount of the compressed image data and the data amount of the page data added thereto is compared with the maximum image coded data size N. When the value of this sum is smaller than the maximum image coded data size N, the data size M is taken as the value of this sum. When the sum of the data amounts is larger than the maximum image coded data size N, the data size M is set to the maximum image coded data size N.
The determination of the image coded data size M is performed, for example, in the processing immediately after the start point of the confidential information area 28 is given and in the first processing operation after the addition and update of the value of the page counter described later. When the data size M is determined, the process proceeds from step a7 to step a8.

At step a8, the encryption circuit 44 uses the encryption key provided from the operation device 46 to
The compressed image data and the page counter value are encrypted. This page counter value corresponds to the page data described above. When the encrypted data is generated in the encryption circuit 44, the process proceeds from step a8 to step a9. In step a9, the error detection code generation circuit 49 generates an error detection code for the encrypted data, and then in step a10
Proceed to. In step a10, the image encoding circuit 50 divides the encrypted data and the error detection code for each image encoded data size M and performs image encoding. That is, the encrypted data is divided into units of data size M, the error detection code of the data is added to each of the divided data, and then the data is encoded. by this,
Encoded data of data size M to be transmitted is generated. The generated encoded data is stored in the image memory 57.

In step a4 described above, the point scanned by the reading device 41 is an area other than the confidential information area 28,
That is, when it is the public information area 27, the process proceeds from step a4 to step a11. In step a11, first, the visual image 29 of the public information area 27 is read and scanned to generate image data. Next, the image data is compressed in the image data compression circuit 43 to generate compressed image data. This compressed image data is stored in the image memory 57, for example.

When the image in the public information area 27 is read, the reading device 41, for example, has the size of the image that can be recorded on the size L1 of the visual display surface of the single recording paper of the reception side facsimile device 22 described above. The image data of the amount corresponding to is read and compressed to generate compressed image data. Also,
When reading the transmission document 26 in which the public information area 27 and the confidential information area 28 are mixed and the image in the public information area 27 is read after reading the confidential information area 28, the size of the unused area of the recording paper is increased. The image having the data amount corresponding to the size of the image that can be recorded in L3 is read and compressed to generate the compressed image data.

When the encoded data of the confidential information area 28 is generated in step a10, the process proceeds to step a12. Also, when the compressed image data of the public information area 27 is generated in step a11, the process also proceeds to step a12.

At step a12, the encoded data in the confidential information area 28 or the compressed image data in the public information area 27 is output to the public telephone line 23 via the transmitter 55,
Send image data. When transmission is done, step a
It progresses from 12 to step a13. In step a13,
It is determined whether or not the image data of the image for one page to be recorded on a single recording sheet of the receiving side facsimile device 22 has been transmitted. When transmitted, the process proceeds to step a14, where the control circuit 47 transmits a page break signal from the transmitter 55 to the public telephone line. The page-break signal is a signal indicating that the image data for a single page has been transmitted, and is a signal indicating the timing at which the receiving-side facsimile device 22 cuts a roll-shaped recording sheet. When the page break signal is transmitted, the process proceeds to step a15. Also, step a1
When it is determined in 3 that the image data for one page has not been transmitted yet, the process proceeds from step a13 to step a15.

At step a15, it is judged whether or not the entire visual display surface of one page of the original document 26 has been read. When reading is completed, step a16
Then, the value of the page counter is incremented by 1 and updated, and then the process proceeds to step a17. When the reading is not completed, the process directly proceeds from step a15 to step a17.

At step a17, it is judged whether or not all the data stored in the image memory 57 has been transmitted to the receiving side facsimile device 22. When not transmitted, it is determined that the image memory 57 still stores at least one of the compressed image data in the area 27 and the encoded data in the area 28. At this time, step a
The process returns from step 17 to step a7, and encoded data is generated from the data stored in the memory 57 and transmitted. When all the data in the image memory have been processed, the process proceeds from step a17 to step a18.

At step a18, it is judged if the transmission of all the originals has been completed. For example, the reading device 41
A detection device for determining whether or not all the originals have been drawn into the apparatus and scanned has been attached to the original setting table on which the originals are first placed. In response to the output from the detection device, the control circuit 47 determines that the transmission of all originals is completed when all the originals on the original placing table are exhausted. When the original remains on the placing table, it is determined that the unscanned transmission original 26 remains. At this time, step a1
The process returns from step 8 to step a4, the next document is pulled into the reading device 41, and scanning is started. When it is determined that the transmission of all the originals is completed, steps a18 to a19
To end the processing operation of the flowchart.

By such an operation, it is possible to transmit the transmission original document 26 in which confidential information and public information are mixed.

FIG. 7 is a flow chart for explaining the image reproducing operation in the reproducing mode of the receiving side facsimile device 22. For example, when the device is powered on, the process proceeds from step b1 to step b2. Step b
In 2, the receiver places the received document 35 on the document mounting table of the reading device 66. Further, the decryption key is input from the operation device 64, and the reproduction start is instructed. When the reproduction start is instructed, the process proceeds from step b2 to step b3. At step b3, the control circuit 71 sets the page counter to an initial value and initializes it. This initial value is, for example, "1"
It is. When the page counter is set, step b
It progresses from 3 to step b4.

At step b4, in the reading device 66, any one of the received originals placed on the original placing table is pulled into the reading device 66, and its visual display surface is scanned to visually display it. Image data of the image of the surface is generated. The generated image data is stored in the image memory 75. When the original is read, steps b4 to b
Go to 5.

At step b5, the image decoding circuit 67
Analyzes the read image data and divides the image data into data belonging to a coded image section and a visual image section. The encoded image classification is the confidential information area 2 of the received document 35.
8, the encoded data of confidential information is visually displayed. The visual image segment corresponds to the public information area 27, and the compressed image data of the public information is visually displayed.

The division between the coded image section and the visual image section is performed, for example, by determining the presence or absence of the reference pattern 52 included in the coded figure 32. That is, the image data including the pattern data of the reference pattern 52 is determined to be encoded data. Further, the image data that does not include the pattern of the reference pattern 52 is determined to be the compressed image data showing the visual pattern 29. The portion where the coded figure 32 is to be displayed is the coded image section, and the portion where the visual figure is to be displayed is the visual image section. When the image division is divided, the process proceeds from step b5 to step b6.

At step b6, it is judged whether the image data to be processed belongs to the coded image section or the visual image section. When it is determined that the image data belongs to the encoded image section,
The process proceeds from step b6 to step b7. In step b7, the image decoding circuit 67 performs image decoding of desired image data for each image segment. Of the decoded data obtained by decoding, the data corresponding to the error detection code is stored in the memory 76. The encrypted data is stored in the image memory 75. Upon completion of image decoding, the process proceeds from step b7 to step b8.

At step b8, the error checking circuit 68 checks the data for errors. When it is determined in the check result of this error check that each data is transmitted without error, the process proceeds to step b9. Step b
At 9, the decryption circuit 69 decrypts the encrypted data using the decryption key stored in the memory 76. As a result, the compressed image data and page data in the confidential information area 28 are decoded. Of the decrypted data, the page data is stored in the memory 76. When the decoding of each data is completed, the process proceeds from step b9 to step b10. In step b10, the compressed image data is decompressed and decompressed in the image data decompression circuit 73. The restored image data is stored in the image memory 75. When the data storage is completed, steps b10 to b
Proceed to 11.

At step b11, it is judged if the value of the page counter of the control circuit 71 is less than the page number indicated by the decoded page data. If so, the process proceeds to step b12, where the page break signal is derived to the printing device 62, and the page counter is incremented by 1 to be updated. When the page break signal is given, the printing device 62 cuts the roll-shaped recording paper. When the updating of the counter value is completed, step b14
Proceed to. If the page counter value is equal to or larger than the page number, the process directly proceeds from step b11 to step b14.

In step b8, the encrypted data is erroneous in the data error check.
If it is determined that the data was not correctly received, step b8
To step b13. At step b13, the control circuit 71 creates a reproduction impossible message. The unreproducible message has a large data error, and the received original 35
It indicates that the visual figure 29 cannot be reproduced from the coded figure 32. When the message is created, the process proceeds from step b13 to step b14. Furthermore, in step b6 described above, when it is determined that the image data to be processed belongs to the visual image classification, the process directly proceeds from step b6 to step b14.

At step b14, the printing device 62 print-converts the supplied data and prints it on a recording paper. The given data is, for example, one of the image data in the confidential information area 28 restored by the image data restoration circuit 73, the image data in the public information area 27, and the reproduction impossible message. When printing is completed, the process proceeds from step b14 to step b15. Step b1
At 5, it is determined whether the image data of all the image sections belonging to the read received document 35 have been processed. If not, the process returns to step b6 to start processing the image data belonging to the next image section. When it is determined that the image data of all the image sections of the read received document are processed, the process proceeds from step b15 to step b16.

At step b16, it is determined whether or not all the received originals 35 placed on the original placing table have been read.
If not, the process returns from step b16 to step b4, and the next received document 35 is pulled into the reading device 66 to start reading. When it is determined that the reading of all the originals is completed, the process proceeds from step b16 to step b17, and the processing operation of the flowchart is completed.

By such a method, the visual image 29 of confidential information can be reproduced from the encoded image 32 of the received original 35.

FIG. 8 is a block diagram showing the electrical construction of the facsimile machines 91 and 92 according to the second embodiment of the present invention. The facsimile devices 91 and 92 of this embodiment are
The components having a similar configuration to the facsimile machines 21 and 22 of the first embodiment and performing the same operation are denoted by the same reference numerals, and detailed description thereof will be omitted. In the facsimile devices 91 and 92 of this embodiment, when the receiving side facsimile device 92 does not correctly receive the transmission data transmitted from the transmitting side facsimile device 91, it notifies the transmitting side facsimile device 91 accordingly.

The transmission side facsimile device 91 has a visual image 29 of the confidential information area 28 of the transmission document 26 including confidential information.
Is converted into an encoded image 32, and the transmission data 30 including the image data is output to the public telephone line 23. The reception side facsimile device 92 has two modes, a reception mode and a reproduction mode. The behavior of each component in the reproduction mode is the same as that of the reception side facsimile device 22 of the first embodiment.
Is the same as the behavior in the playback mode of. In the reception side facsimile device 92 in the reception mode, the reception device 61 receives the transmission data 30 transmitted through the public telephone line 23, performs demodulation and expansion processing to obtain the reception data 34, and the received data 34 is printed by the printing device. To 62. The printing device 62 records and converts the received data 34 as it is and prints it on recording paper.
The printing device 62 includes a reading element 94. The reading element 94 reads the print content immediately after the recording-converted received data 34 is printed on the recording paper when the reproduction document 38 is created in the reception mode.

FIG. 9 is a schematic view showing a simplified configuration of the printing device 62. The recording paper 96 is sandwiched between a pair of rollers 98 that rotate in opposite directions shown by arrow 97, and is moved in the direction of arrow 99 by the rotation of the roller 98. The print head 100 of the printing device 62 is provided downstream of the roller 98 of the recording paper 96 in the moving direction 99.

The print head 100 includes a receiving device 61.
Received data 34 is given from the processing circuit 101 via the processing circuit 101. The print head 100 combines print pixels in one of the black display mode and the white display mode on the one surface 103 of the recording paper 96 in accordance with the combination of the bits “1” and “0” of the received data 34. Print a pattern consisting of. The processing circuit 101 converts the received data 34 supplied from the receiving device 61 into a form for driving the print head 100, and then supplies the print data to the print head 100.

The above-mentioned reading element 94 is provided at a position where it can face the one surface 103 of the recording paper 96, and is provided downstream of the print head 100 in the moving direction 99 of the recording paper 96. As a result, the print pixels printed on the recording paper 96 by the print head 100 can be read by the reading element 94.

Received data 3 read by the reading element 94
4 is supplied to the image decoding circuit 67. In the image decoding circuit 67, the received data 3 read by the reading element 94
4 is decoded in the same manner as the image data 37 read by the reading device 66 to generate decoded data. This decoded data is supplied to the error checking circuit 68 and is subjected to error checking. The check result of this error check is given to the control circuit 71. In the error check, when it is determined that the data is so large that the decryption by the decryption circuit 69 is impossible, the control circuit 71 generates a reception failure message. This reception failure message is derived from the transmission device 105 to the public telephone line 23. The transmitting device 105 has the same configuration as the transmitting device 56 of the transmitting side facsimile device 91 and performs the same operation.

The transmitting side facsimile device 91 is provided with a receiving device 106. The receiving device 106 has the same configuration as the receiving side facsimile device 92 and performs the same operation. The reception failure message transmitted from the reception side facsimile device 92 is transmitted via the public telephone line 23 to the reception device 10
6 is received. The receiving device 106 gives the received reception failure message to the control circuit 47. by this,
When the reception side facsimile device 92 fails to receive the transmission data, the reception side facsimile device 91 can be notified of the reception failure without delay. In addition, the control circuit 47
When receiving the reception failure message, displays on the display device 107 that the transmission of the transmission message has failed. The display device 107 is, for example, a cathode ray tube or a liquid crystal display device. Alternatively, a printing device may be used as the display device, and a message to that effect may be printed on a recording sheet and visually displayed.

As described above, the transmitting side facsimile device 91
In the receiving side facsimile device 92, the fact that the reception of the transmission data has failed can be visually displayed and presented to the sender. As a result, the sender can determine whether the transmission data of the transmitted transmission document 26 has been correctly received by the recipient. Further, since the confidential information in the transmission document 26 is sent in the form of the coded graphic 32, immediately after the reception by the receiving side facsimile device 92, it is confirmed whether the coded data of the confidential information is correctly received. Is difficult to judge. At this time, if an error check is performed on the encoded data of confidential information as described above, it can be easily determined whether or not the confidential information is correctly received immediately after the reception.

FIG. 10 is a block diagram showing the electrical construction of the receiving-side facsimile apparatus 111 according to the third embodiment of the present invention. The facsimile apparatus 111 of this embodiment
Has a configuration similar to that of the receiving side facsimile apparatus 22 of the first embodiment, and the same reference numerals are given to the components that perform the same operation, and detailed description thereof will be omitted. The facsimile apparatus 111 of this embodiment has a confidential recording mode in which the transmitted transmission data is handled as confidential information by the receiving facsimile apparatus.

Transmission data is transmitted to the facsimile device 111 via the public telephone line 23 from any of the transmitting side facsimile devices 21 and 91 for performing confidential communication and the conventional facsimile device. From these facsimile machines, for example, transmission data containing only public information is transmitted.

The facsimile device 111 is provided with the operating device 64.
It is possible to switch to any one of the reception mode, the reproduction mode, and the confidential recording mode by an input instruction from. In receiving mode, public telephone line 23
The reception data is generated by receiving the transmission data transmitted via the reception device 61. The received data is recorded and converted as it is by the printing device 62 and printed on the recording paper to form the received document 35. In the reproduction mode, the received original 35
Is read by the reading device 66, the image data is decrypted, an error check is performed, and then the code is decrypted to restore the image data of the original transmission data. The restored image data is recorded and converted by the printing device 62 and printed on recording paper,
A reproduced document 38 is created. The behavior of each component in these modes is the same as the behavior of the receiving side facsimile device 21 of the first embodiment.

In the confidential recording mode, the received data output from the receiving device 61 is applied to the confidential recording unit 113 and then output to the printing device 62. Confidentiality recording unit 113
Then, the received data is compressed by the image data compression circuit 115 and then encrypted by the encryption circuit 116. Further, the encrypted received data is image-encoded in the image encoding circuit 118 after being added with the error detection code generated by the error detection code generation circuit 117. The image-encoded received data is recorded and converted by the printing device 62 and printed on recording paper. Thereby, for example, the transmission data transmitted as the public information is printed on the recording paper in the form of the same coded figure 32 as the confidential information. Therefore, the printing apparatus 62 ejects a document having the same form as the received document 35.

Each circuit 115 to 118 of the confidential recording unit 113
Performs the same operation as the circuits 43, 44, 49, 50 of the facsimile device 21 on the transmission side of the first embodiment. The encryption key used for the encryption performed by the encryption circuit 116 is assumed to be stored in the memory 76 in advance. In this way, in the facsimile apparatus 111, the transmission data transmitted as public information can be concealed from a third party in the same manner as confidential information.

FIG. 11 is a block diagram showing the electrical construction of the facsimile machines 121 and 122 according to the fourth embodiment of the present invention. FIG. 12 shows the facsimile apparatus 1 of FIG.
It is a schematic diagram which shows the confidential communication performed between 21 and 122. 11 and 12 will be described together. The facsimile devices 121 and 122 of this embodiment have a similar configuration to the facsimile devices 121 and 122 of the first embodiment, and the components that perform the same operation are assigned the same reference numerals and detailed description thereof is omitted. To do. The facsimile device 121 of the present embodiment,
At 122, the data amount of the transmission data transmitted and received between the devices 121 and 122 is reduced as compared with the data amount of the transmission data between the devices 21 and 22 of the first embodiment.

When performing confidential communication, the sender sends the original document 26 to be transmitted to the reading device 4 of the facsimile device 121.
Let 1 read. The reading device 41 photoelectrically converts the visual image 29 of each area 27, 28 of the transmission original 26 and outputs the obtained image data. Of these image data, the image data of the visual figure 29 in the confidential information area 28 is compressed, then encrypted, and given to the image encoding circuit 130. An error detection code is given from the error detection code generation circuit 49 to the image coding circuit 130. In the image encoding circuit 130, an error detection code is added to the encrypted image data, and the image encoding process described later is applied to the image data to generate virtual encoded data indicating the virtual encoded figure 126. This virtual encoded data and the public information area 27
From the compressed image data of the visual figure 29 of the transmission data 1
25 is created. This transmission data 125 is transmitted to the receiving side facsimile device 122 via the public telephone line 23. Thereafter, the image surrounded by the alternate long and short dash line in FIG. 12 shows a virtual image in which the electrical signals and data are virtually visually displayed.

In the virtual image 127 of the transmission data 125,
Public information is displayed in the public information area 27 as a visual graphic 29. In the confidential information area 28, confidential information is represented as a virtual coded graphic 126. Virtual encoded figure 126
Is a figure obtained by further image-encoding the coded figure 32, and shows a pattern different from the above-mentioned visual figure 29.

In the image coding circuit 130, the visual figure 29
The image data representing the predetermined number of pixels is converted into image data for printing the transmission pixel group in the printing device 62 of the reception side facsimile device 122. The transmission pixel group is a print dot matrix composed of (p × q) pixels in which p pixels in the vertical direction Y and q pixels in the horizontal direction X are arranged in a matrix. The predetermined number of pixels is, for example, one pixel.

That is, the virtual coded graphic 126 is a graphic in which one pixel of the original visual graphic 29 is represented by a transmission pixel group consisting of (p × q) pixels of the printing device 62 of the receiving side facsimile device 122, for example. is there. Therefore, when the original visual figure 29 is composed of (r × s) pixels, the virtual coded figure 126 of this visual figure 29 is {(p × r) ×
(Q × s)} pixels. As described above, the virtual coded figure 126 is composed of (r × s) transmission pixel groups. The number of print pixels (p × q) that form the transmission pixel group that is the minimum unit pattern of the virtual coded figure 126
Is less than the number (n × m) of print pixels included in the minimum unit pattern of the coded figure 32 described above. Hereinafter, the pixel group forming the minimum unit pattern of the coded figure 32 will be referred to as a display pixel group.

(P × q) <(n × m) (12) Further, in the transmission pixel group of the virtual coded figure 126,
Regarding the numbers p and q of print pixels arranged in the vertical and horizontal directions Y and X, at least one is less than the number n and m of print pixels of the display pixel group of the coded graphic 32, and the other is coded. The number is selected to be equal to or less than the number of print pixels of the display pixel group of the graphic 32.

P ≦ n and q <m or p <n and q ≦ m (13) Therefore, the number of print pixels forming the virtual coded figure 126 is the same as the number of print pixels forming the coded figure 32. It is less than the number. As a result, the data amount of the image data representing the virtual coded figure 126 becomes less than the data amount of the image data representing the coded figure 32.

Each pixel of the visual pattern 29 described above is in one of a white display state and a black display state, for example. In the coded graphic 32, the combination arrangement pattern of the white display and the black display of each (n × m) print pixels of the display pixel group is made different, and the corresponding visual graphic 29 is displayed in either white or black. Indicates whether there is. Similarly, also in the virtual coded graphic 126, the combination arrangement pattern of the white display and the black display of each (p × q) print pixels of the transmission pixel group is made different, and the pixel of the corresponding visual graphic 29 is white. Indicates whether it is a display or a black display. This combination arrangement pattern may be similar to the arrangement pattern of the (n × m) print dot matrix of the coded figure 32 corresponding to the pixels in the same state, or may be a completely different combination arrangement pattern. Is also good.

Further, in the virtual coded figure 126,
Reference patterns represented by (p × q) minimum unit patterns are regularly arranged in a predetermined cycle. The reference pattern serves as a reference for distinguishing the virtual coded graphic 126 and the visual graphic 29, and further, the virtual coded graphic 12
6, which serves as a reference for the one and the other directions X and Y. This reference pattern is, for example, the coded figure 32.
Is similar to the reference pattern 52 described above and is inserted in the figure 126 with the same arrangement pattern. Therefore, when the combination arrangement pattern of pixel display in each print dot matrix is similar, the virtual coded figure 126 becomes a figure similar to the coded figure 32.

The facsimile machine 122 on the receiving side operates in the receiving mode and the reproducing mode. In the reception mode, the transmission data transmitted through the public telephone line 23 is received as reception data, and the reception original 35 is created from the reception data. In the reproduction mode, the visual information 29 of confidential information is reproduced from the coded graphic 32 of confidential information described above. Facsimile device 122 is normally set to receive mode. The behavior of each component in the playback mode in the device 122 of the present embodiment is the same as the behavior of each component of the device 22 in the first embodiment. Therefore, when the device 122 is switched to the reproduction mode and the received document 35 is read, the image data of the visual pattern 29 of confidential information can be reproduced from the image data.

The reception mode will be described below. The facsimile device 122 receives the transmission data transmitted via the public telephone line 23. The receiving device 61 obtains received data 129 by performing demodulation processing and decompression processing of this transmission data based on a predetermined facsimile transmission method. The reception data 129 and the transmission data 125 are the same electric signal if transmission and reception are performed without error, and the virtual image of the reception data 129 is equal to the virtual image 127 of the transmission data 125. The obtained reception data 129 is given to the image segment conversion circuit 131. Image segment conversion circuit 1
At 31, the data in the received data 129 is divided into compressed image data in the public information area 27 and virtual encoded data in the confidential information area 28. The compressed image data in the public information area 27 is given to the printing device 62 as it is. The virtual coded data in the confidential information area 28 is given to the printing device 62 after being subjected to conversion processing described later. In the printing device 62, the given data is recorded and converted by a predetermined method and printed on recording paper to create the received document 35. In the received document 35, public information is displayed in the form of visual graphics 29 in the public information area 27, and confidential information is displayed as a coded graphic 32 in the confidential information area 28. by this,
The virtual coded image composed of {(p × r) × (q × s)} pixels is {(n × r) × (mxs)} [(n ×
r) = N; (m × s) = M] is converted into a coded figure 32. Therefore, the original visual figure 29
Is equivalent to being divided into (r × s) blocks, and the coded figure 32 is composed of (r × s) display pixel groups.

FIG. 13 shows the facsimile apparatus 122 on the receiving side.
3 is a flowchart for explaining the behavior of each component in the reception mode of FIG. The division processing operation and conversion processing operation of each area 27, 28 in the reception mode will be described with reference to this flowchart.

When the device 122 is powered on, step c
The process proceeds from step 1 to step c2. In step c2, the reception device 61 starts receiving the transmission data 125.
The receiving device 61 obtains received data 129 by performing demodulation processing and decompression processing on the received transmission data 125 based on a predetermined facsimile transmission procedure. The received data 129 is sequentially stored in the image memory 75. This received data corresponds to one page of the received document 35 in the image memory 7
When stored in 5, the process proceeds from step c2 to step c3.

At step c3, the image segment conversion circuit 13
In 1, the division processing operation of the encoded image division and the visual image division is performed. In the segmentation processing operation, the received data 129 obtained is analyzed, and the data is segmented into virtual encoded data belonging to the encoded image segment and compressed image data belonging to the visual image segment. The encoded image section corresponds to the confidential information area 28 of the received document 35, and the visual image section corresponds to the public information area 27.

The division between the coded image section and the visual image section is performed, for example, by determining the presence or absence of a reference pattern included in the virtual coded figure 126. That is, the image data including the pattern data of the reference pattern is determined to be virtual encoded data. Further, image data that does not include the pattern of the reference pattern is determined to be compressed image data.

This partitioning processing operation is performed by an operation equivalent to the partitioning operation in step b5 of the flow chart of FIG. Further, the virtual encoded figure 126 of the received data 129 of this embodiment is the received data 3 of the first embodiment.
4 is smaller than the coded figure 32 of 4. Therefore, the included reference pattern is also smaller than the reference pattern 52 of the received data 34 of the first embodiment, and the amount of data is small. Therefore, in the compressed image data of the visual image segment of the present embodiment, there is a greater possibility that the same data as the pattern data of the reference pattern will occur in it in comparison with the first embodiment. Therefore, in the division processing operation in this step, it is detected whether or not the arrangement state of the plurality of pattern data in the entire virtual encoded data has a predetermined regularity as well as the presence or absence of the pattern data of the reference pattern 52. However, it is preferable to judge these detection results together. When the image division is thus divided, the process proceeds from step c3 to step c4.

At step c4, it is judged whether the data to be processed belongs to the coded image section or the visual image section. When it is determined that the data belongs to the encoded image section, the process proceeds from step c4 to step c5. In step c5, the image segment conversion circuit 131 performs a conversion process on the virtual encoded data to be processed for each image segment.
In the circuit 131, for example, the image data of the virtual coded figure 126 including a plurality of pixels is divided into a transmission pixel group including (p × q) pixels. As a result, the image data is divided into image data of (r × s) transmission pixel groups.

At this time, the circuit 131 detects the pattern data of the reference pattern from the virtual coded data and divides the pixels based on the arrangement of the reference pattern. Since the virtual encoded data is handled as data, it is considered that the arrangement direction of the pixels does not shift, unlike the processing in the reading device 66 in the reproduction mode. Therefore, this reference pattern is often used to define a reference point for a section of pixels.

Next, the image segment conversion circuit 131 converts the image data of each transmission pixel group into the image data of the display pixel group of the combination arrangement pattern of the corresponding display form. As a result, the virtual coded data becomes the coded data of the coded figure 32 displayed in the display pattern in which the (n × m) display pixel group is the minimum unit pattern. This conversion process is performed, for example, in each transmission pixel group unit,
It is temporarily stored in the image memory 75 for each pixel group. When the processing for all the pixel groups in a single image section is completed, the process proceeds from step c5 to step c6.

At step c6, the obtained encoded data is given to the printer 62. If it is determined in step c4 that the image segment to be processed is the visual image segment, the process from step c4 to step c4 is continued.
Proceed to 6. At this time, the compressed image data of the visual image section to be processed is given to the printing device 62. Printing device 6
2 converts the recording of the given data and prints it on recording paper. When printing is completed, steps c6 to c7
Proceed to. In step c7, it is determined whether or not the data of all the image sections included in the received data for one page stored in the image memory 75 has been processed. If not, the process returns to step c3 to start processing the data belonging to the next image section. If it is determined that the data of all the image sections of the received data for one page has been processed, step c7
To step c8.

At step c8, it is judged whether or not the processing has been completed for all the received data. If not processed, steps c8 to c2
Then, the received data for the next one page is received and processed.
When it is determined that the processing for all the received data is completed, the process proceeds from step c8 to step c9, and the processing operation of the flowchart is completed.

By such a method, the received document 35 can be created by converting the received data.

The facsimile device 12 on the transmitting side of the present embodiment
In No. 1, the confidential information displayed in the confidential information area 28 is converted into encoded data and then transmitted. Although the amount of this encoded data is smaller than that of the encoded data of the first embodiment, the maximum amount of data is (r × q) times that of the image data of the visual figure of confidential information. To increase. Therefore, the amount of data to be transmitted increases. Therefore, also in the transmission side facsimile apparatus 121, it is preferable that the image data compression circuit 43 compresses the original image data as much as possible to reduce the data amount, as in the apparatus 21 of the first embodiment.

Facsimile devices 121 and 1 of this embodiment
Between 22, the image data of confidential information is image-encoded.
At this time, the virtual coded image 126 can be a graphic different from the coded graphic 32. For example, when the received data including the virtual coded data of the virtual coded figure 126 is received by the facsimile device of the third party, the virtual image 127 of the received data 129 is printed as the received document. Therefore, even if the third party happens to obtain the decryption key, the virtual coded graphic 126 and the coded graphic 32 can be obtained.
Since it is not possible to perform the conversion process with, it becomes difficult to reproduce the visual figure 29 from the virtual coded figure 126. therefore,
Further, the confidentiality of information can be improved.

Facsimile apparatus 2 of the first to fourth embodiments
1, 22; 91, 92; 111; 121, 122 respectively have only one of the constituent elements on the transmitting side and the constituent elements on the receiving side. These facsimile machines 21, 22; 91, 92; 111; 121, 12
2 may have the other component of either the transmitting side or the receiving side. At this time, in each device, the constituent elements that perform the same operation can be used in combination. For example, facsimile machines 21, 22; 9
1, 92; 111; 121, 122, the reading devices 41 and 66 on the transmitting side and the receiving side and the operating device 4
6, 64 and the memories 57, 58, 75, 76 can be common, and only a single unit can be provided. This reduces the number of parts in the device. Further, in the facsimile devices 91 and 92 of the second embodiment, the transmission device 5
5, 105 and the receiving devices 61, 106 can be a common device. Furthermore, in the facsimile apparatus 111 of the third embodiment, each circuit 115 to 115 of the confidential recording unit 113 is used.
118 can be common to the same circuit of the transmitting device. In this way, each device 21, 22; 91, 92;
111; 121 and 122 may have both the configurations of the transmitting side and the receiving side. Further, the number of parts of the device is reduced when the device having both of them is prepared rather than preparing these devices individually.

[0154]

As described above, according to the present invention, when a facsimile communication apparatus performs confidential communication, it transmits after transmitting the original data to be transmitted by the facsimile apparatus on the transmitting side after image encoding, and on the receiving side. The data is once printed on recording paper and used as the received document.

As described above, the image-encoded transmission document data is visually displayed on the reception document. Therefore, the received document is printed with a graphic that is completely different from the visual graphic of the original confidential information. As a result, the receiving device does not need a large capacity memory for storing data. Further, the printed recording paper need not be managed so as not to be seen by a third party. Furthermore, the reception of the transmitted data is performed in the same manner as in a general facsimile apparatus. Therefore, any facsimile machine can receive the transmitted data.

When reproducing the image-encoded data, the facsimile apparatus on the receiving side re-reads the received document to form image data, and reproduces the original data based on the image data. At this time, since the original data is image-encoded and printed, the original data can be surely decoded even if the reading shift and the tilt occur during reading. Therefore, the transmitted data can be surely obtained.

Further, according to the present invention, the facsimile communication apparatus performs image coding of the transmission original data to be transmitted by the facsimile apparatus on the transmission side, and transmits the data when the confidential communication is performed. In the facsimile apparatus on the receiving side, the received data is converted, the number of pixels of the image indicated by the data is increased, and then the image is printed to form a received document. The receiving-side facsimile machine re-reads the received document to form image data, and reproduces the original transmitted document data based on the image data.

As described above, in this communication device, it is difficult for a third party to grasp the content of the transmitted document data even when the received document is visually observed. Further, since the received data is printed on the recording paper, it is easy to store and manage the data, and no special device such as a large capacity memory is required. Furthermore, in the receiving side facsimile apparatus, the image of the received data is converted and enlarged, and then printed on the recording paper. Therefore, the number of pixels included in the print dot matrix, which is the minimum unit required to reproduce the data, increases, so that the data can be surely reproduced. Further, the amount of data to be transmitted can be reduced as compared with the case where the print dot matrix required for data reproduction is used as it is as the minimum unit of image encoding in the transmitting side facsimile apparatus. Therefore, the transmission time can be reduced.

Furthermore, according to the present invention, additional data is added to the transmission image data to be transmitted. Both of these data are image-encoded and then transmitted. As a result, this additional data can also be kept secret from a third party, and the reproduction from the received document is ensured. Further, since the data necessary for the reproduction operation of the transmitted document data are transmitted together, it is not necessary to separately transmit and receive these data between the facsimile machines on the transmitting side and the receiving side.

Further, according to the present invention, in the apparatus on the transmission side, the data is transmitted for each individual original of the transmission original, and the page data is added for each individual original data. The device on the receiving side performs image decoding for each data sectioned by the page data regardless of the number of pages of the received document. As described above, since the data of each individual document is image-encoded, the data amount increases, and the received document may be visually displayed over a plurality of pages. Since the receiving side device performs image decoding according to the page data, it is possible to reliably reproduce the original data of the original having the same number of pages as the transmission original regardless of the number of pages of the received original.

Further, according to the present invention, the device on the transmission side adds an error detection signal to the transmission original data as additional data. The device on the receiving side detects a transmission error using the reproduced detection signal. When an error is detected, the receiver is notified to that effect. As a result, the receiver can confirm whether or not the transmitted document is correctly reproduced on the receiving side device. In addition, it is possible to prevent a wrong reproduced document from being printed out.

Furthermore, according to the present invention, the device on the receiving side rereads the print content of the received document and immediately after that, performs an error check. When an error is detected in this error check, the device on the receiving side causes the device on the transmitting side to present the fact to the sender through the public line. As a result, the error check can be performed immediately after the transmission regardless of whether or not the receiver reproduces the received document. Further, when a difference is detected by the error check and the transmission is unsuccessful, the fact is notified to the sender, so that the sender can take measures such as retransmission. Therefore, the data can be surely transmitted.

Further, according to the present invention, the receiving-side device image-encodes all the transmitted data and prints it in the same form as the received original. As a result, all data transmitted from unspecified senders can be treated as confidential information.

Furthermore, according to the present invention, the device on the transmission side transmits only the information described in the area designated by the sender as confidential information. With this, for example, the destination and the address of the transmission destination of the transmission original can be added to the original as public information, which facilitates the handling on the receiving side.
In addition, the amount of data to be transmitted can be reduced as compared with the case where all the described items are confidential information. Therefore, it is possible to reduce the amount of processing data and the transmission time in the transmission side device.

[Brief description of drawings]

FIG. 1 is a block diagram showing an electrical configuration of facsimile devices 21 and 22 according to a first embodiment of the present invention.

2 is a diagram schematically showing confidential communication between the facsimile devices 21 and 22 of FIG.

3 is a diagram showing a detailed configuration of a coded graphic 32 visually displayed in a confidential information area 28 of a received document 35. FIG.

FIG. 4 is a visual diagram 2 of a confidential information area 28 of a transmission document 26.
The transmission original 26 and the reception original 35 when 9 is a natural image
It is a figure which shows the relationship with.

FIG. 5 is a visual image 2 of the confidential information area 28 of the transmission document 26.
Transmission document 26 and reception document 3 when 9 is a simple line drawing
5 is a diagram showing a relationship with FIG.

FIG. 6 is a flowchart for explaining a document transmission operation in the facsimile device 21.

FIG. 7 is a flowchart for explaining a document reproduction operation in the reproduction mode of the facsimile device 22.

FIG. 8 is a block diagram showing an electrical configuration of facsimile devices 91 and 92 according to a second embodiment of the present invention.

FIG. 9 is a schematic diagram showing a detailed configuration of a printing device 62 of a facsimile device 92.

FIG. 10 is a block diagram showing an electrical configuration of a facsimile device 111 according to a third embodiment of the present invention.

FIG. 11 is a block diagram showing an electrical configuration of facsimile devices 121 and 122 according to a fourth exemplary embodiment of the present invention.

12 is a diagram schematically showing confidential communication between the facsimile devices 121 and 122 of FIG.

FIG. 13 is a flowchart for explaining a classification processing operation and a conversion processing operation in a reception mode in the reception side facsimile device 122.

FIG. 14 is a block diagram showing an electrical configuration of a facsimile device 1, 2 of a third conventional technique.

[Explanation of symbols]

21,22,91,92,111,121,122 Facsimile device 23 Public telephone line 41,66 Reader 43,115 Image data compression circuit 44,116 Encryption circuit 46,64 Operating device 47,71 Control circuit 49,117 Error detection code generation circuit 50, 118, 130 Image coding circuit 55, 105 Transmission device 61, 106 Reception device 62 Printing device 67 Image decoding circuit 68 Error checking circuit 69 Decryption circuit 94 Read element 107 Display device 113 Confidential recording unit

Claims (8)

[Claims] 1. A facsimile communication apparatus comprising a transmitting side facsimile apparatus and a receiving side facsimile apparatus connected to the transmitting side facsimile apparatus via a public line, wherein the transmitting side facsimile apparatus is a document surface of a transmission original. Is divided into a plurality of transmission pixels each having a predetermined size arranged in a matrix, and the luminance of the original surface is optically read for each transmission pixel, and the transmission original is a set of transmission pixel data indicating the luminance. In response to the output of the transmission original reading unit and the transmission original reading unit, display data composed of a plurality of data units for causing the receiving facsimile apparatus to print a single print dot in response to the output of the transmission original reading unit In response to the output of the display data generation means and the display data generation means, a predetermined number of data units of the display data are (n × m) (n and m are Either one is an integer of 2 or more, and (n × m) is an integer equal to or more than a predetermined number) Corresponding to the dot matrix of the minimum unit consisting of print dots of the receiving-side facsimile device, and displaying The receiving side facsimile includes an encoding means for converting the data into encoded data in a form to be printed by a receiving side facsimile device as a pattern shape composed of a dot matrix of a minimum unit, and a transmitting means for transmitting the data to a public line. The device responds to the output from the receiving means and the receiving means for receiving the transmitted data, and prints the data on the original surface of the recording paper as a pattern shape composed of print dots to create a received original. The reception printing unit for ejecting the reception original to the outside of the apparatus and the original surface of the reception original generated by the reception printing unit are arranged in a plurality of print pixel units arranged in a matrix. , It divides into print pixel units of the same size as the print dots, optically reads the brightness of the document surface for each print pixel, and outputs the received document data, which is a collection of print pixel data indicating the brightness of each print pixel. In response to the output of the received document reading means, the received document data is divided into a plurality of pixel data matrixes each of which is composed of (n × m) print pixel data, and each pixel data matrix is printed. Decoding means for converting the predetermined number of data units corresponding to a combination of pixel data and reproducing the display data, and original reproduction for reproducing transmission original data from the display data in response to the output of the decoding means. A facsimile communication device comprising: a means. 2. A facsimile communication apparatus comprising a transmitting side facsimile apparatus and a receiving side facsimile apparatus connected to the transmitting side facsimile apparatus via a public line, wherein the transmitting side facsimile apparatus is a document surface of a transmission original. Is divided into a plurality of transmission pixels each having a predetermined size arranged in a matrix, and the luminance of the original surface is optically read for each transmission pixel, and the transmission original is a set of transmission pixel data indicating the luminance. In response to the output of the transmission original reading unit and the transmission original reading unit, display data composed of a plurality of data units for causing the receiving facsimile apparatus to print a single print dot in response to the output of the transmission original reading unit In response to the output of the display data generating means and the display data generating means, a predetermined number of data units of the display data are (p × q) (p, q are One of them is an integer of 2 or more, and (p × q) is an integer equal to or greater than a predetermined number) Corresponding to a dot matrix of a minimum unit composed of print dots of the facsimile apparatus on the receiving side, and displayed. The receiving side facsimile includes an encoding means for converting the data into encoded data in a form to be printed by a receiving side facsimile device as a pattern shape composed of a dot matrix of a minimum unit, and a transmitting means for transmitting the data to a public line. The apparatus responds to the output from the receiving means and the receiving means for receiving the transmitted data, and prints the received data on the receiving side facsimile apparatus with a dot matrix of a minimum unit of (p × q) print dots. The transmission data matrix is divided into (n × m) (n, m are (n
Xm) is larger than (p × q), and n>
p and m ≧ q or n ≧ p and m> q) a conversion unit for converting a dot matrix of print dots into a display data matrix for printing, and a plurality of display data in response to the output of the conversion unit. A reception printing unit that prints data composed of a matrix as a pattern shape composed of print dots on a document surface of a recording paper to create a reception document, and discharges the reception document out of the apparatus, and a reception printing unit. The generated document surface of the received document is divided into a plurality of print pixel units arranged in a matrix, each print pixel unit having the same size as a print dot, and the brightness of the document surface is optically determined for each print pixel. Read document data, which is a collection of print pixel data indicating the brightness of each print pixel, and outputs the received document data, and the received document data is (n × m) in response to the output of the received document reading unit. Decoding for reproducing the display data by dividing the pixel data matrix into a plurality of pixel data matrixes each of which is composed of print pixel data, and converting each pixel data matrix into the predetermined number of data units corresponding to the combination of the print pixel data. A facsimile communication apparatus comprising: a means and a document reproducing means for reproducing transmitted document data from display data in response to an output of the decoding means. 3. The display data generation unit includes an addition unit that responds to the output of the transmission document reading unit and adds predetermined additional data to the transmission document data to generate display data. 3. The facsimile communication apparatus according to claim 1, further comprising: a separating unit that separates the additional data and the transmission original data from the display data in response to the output of the decoding unit. 4. The transmission original is composed of a plurality of individual originals each having an original surface, and the transmission original data is a plurality of individual original data indicating the brightness of the original surface of each sequentially read individual original. The additional data is page data indicating the order in which the individual document data is read by the transmission document reading unit and the division of the individual document data in the transmission document data, and the decoding unit of the receiving side facsimile device. 4. The facsimile communication apparatus according to claim 3, wherein the display data is reproduced for each individual data unit divided by page data. 5. The transmission side facsimile apparatus further includes detection signal generation means for generating an error detection signal for inspecting a transmission error of the transmission document data in response to the output of the transmission document reading means. The additional data is an error detection signal, and the receiving-side facsimile device responds to the output of the separating means and uses the error detection signal to generate a difference between the reproduced transmission original data and the transmission original data before transmission. If there is a difference between the reproduced transmission original data in response to the output of the error detecting means and the error detecting means for checking whether or not there is an error on the receiving side, which is presented to the user of the facsimile apparatus on the receiving side. The facsimile communication apparatus according to claim 3, further comprising display means. 6. The transmission-side facsimile apparatus responds to the output of the transmission-original reading section, and generates detection signal generation means for generating an error detection signal of the transmission-original data, and a transmission-original transmitted from the transmission-side facsimile apparatus. And a transmission side error display means for presenting to the user that there is a difference between the data and the transmission original data reproduced by the reception side facsimile device, wherein the additional data is an error detection signal, The side facsimile apparatus is a plurality of pixel units arranged in a matrix on the document surface of the received document before the document is ejected by the reception printing unit, and is a print pixel unit having the same size as a print dot. And read the brightness of the original surface optically for each print pixel,
A confirmation document reading unit that outputs confirmation document data, which is a set of print pixel data indicating the brightness of each print pixel, and (n × m) print pixels for the confirmation document data in response to the output of the confirmation document reading unit. Decoding means for confirmation, which is divided into a plurality of pixel data matrixes of data, is converted into the predetermined number of data units corresponding to the combination of the print pixel data for each pixel data matrix, and reproduces the display data. In response to the output of the confirmation decoding means, the error detection signal separated from the display data is used to check whether or not there is a difference between the reproduced transmission original data and the transmission original data before transmission. If there is a difference between the transmission error data that is reproduced in response to the output of the confirmation error detection means and the confirmation error detection means, the fact that the difference has occurred is sent via the public line. Facsimile communication apparatus according to claim 3, further comprising a presentation means for displaying the sender error display means. 7. The transmission means of the transmission side facsimile device transmits the display data output from the display data generation means to a public line, and the reception side facsimile device responds to the output of the reception means and receives the data. (N × m) (n or m is an integer of 2 or more, and (n × m) is an integer of a predetermined number or more) Receiving-side encoding means for converting into receiving-side encoded data of a mode in which the receiving-printing means prints as a pattern shape composed of the minimum-unit dot matrix in correspondence with the minimum-unit dot matrix composed of individual print dots; Responsive to the output of the receiving side encoding means, the receiving side encoded data is added with predetermined additional data to generate print data, and is output to the printing means. Switching means for switching whether or not to perform recording, the receiving means is responsive to the output of the switching means, and applies the received data to the receiving side encoding means only when performing confidential recording. The facsimile communication device according to claim 1 or 2. 8. The transmission original includes a confidential information area in which contents to be confidentially transmitted are visually displayed, and a public information area in which contents not to be confidentially transmitted are visually displayed. The transmission original reading means of the apparatus includes a dividing means for dividing the confidential information area and the public information area of the transmission original, and the data showing the visual display contents of the public information area of the transmission original data is directly transmitted from the transmission means to the The received original reading means of the receiving facsimile apparatus includes a dividing means for dividing the confidential information area and the public information area of the received original, and the confidential information area of the received original data is visually checked. 3. The facsimile communication apparatus according to claim 1, wherein only the data indicating the display content is given to the decoding means.