JPH0723150A - Facsimile equipment - Google Patents

Abstract

PURPOSE:To suppress deterioration in legibility of a picture while suppressing degrading of the communication efficiency and the increase in the communication cost. CONSTITUTION:A collation means 2b collates an identification signal of a present communication opposite party after detecting decoding error by a detection means 2a during communication with an identification signal stored in a RAM 3. When the identification signals are coincident, data are processed by the linear coding system and When the data are not stored, the data are processed by the 2-dimension coding system with a short communication time. When a decoded error is affected, the effect during communication is set to an integration means 2c and the identification signal of the communication opposite party is stored in the RAM 3 and then the communication is finished. When no effect is received and the identification signal of the opposite party is not stored in the RAM 3, the communication is finished, and when the identification signal is stored, the result of no effect is set to the integration means 2c. When effect is not caused for a predetermined number of times through a series of communication number of times, it is recognized that the state of a communication line is improved and the identification signal of the opposite party in the RAM 3 is deleted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facsimile apparatus having the functions of both the one-dimensional coding system and the two-dimensional coding system.

[0002]

2. Description of the Related Art Conventionally, a facsimile machine of this type transmits and receives a test signal (Training Check Facilities: TCF) through a communication line such as a public line or a specific line, and the noise occurs due to, for example, deterioration of the line state. It is confirmed that the image data to be sent and received is not disturbed, and the International Telegraph and Telephone Consultative Committee (CCITT) has standardized it as a one-dimensional coding method (MH coding method) or two-dimensional coding method (MR code). Image data to be transmitted is encoded, and the received image data is encoded and printed out by a printer.

By the way, the two-dimensional coding method has a higher data compression rate than the one-dimensional coding method, and therefore the communication time is short. Sending and receiving data.

Further, after the test signal is recognized, when the received image data includes a large amount of decoding error due to the deterioration of the line condition, the image data cannot be received from the receiving side to the transmitting side. Send a message. Then, the sender confirms this and resends again.

[0005]

By the way, in the one-dimensional coding method, since the individual scanning lines of the image data are coded with no relation to each other, the noise due to the deterioration of the line condition causes When the image data of a part of the scanning lines is destroyed, only the image printed out of the scanning line is lost, and the image data of the scanning line not affected by noise is printed out as it is. Therefore, even if some of the scan lines are lost, the image is often practically readable.

On the other hand, in the two-dimensional encoding system, since only the difference information with respect to the image data of the immediately preceding scanning line is transmitted to increase the compression rate of the image data, the scanning line destroyed by noise is detected. It becomes impossible to print out the image data of the scanning line following the image data. Therefore, even if an image of a scan line that is not affected by noise is lost due to the destruction of a part of the scan line, the readability of the received image may be significantly reduced.

When image data is transmitted / received between facsimile machines equipped with the two-dimensional encoding system, the two-dimensional encoding system is automatically selected and the image data is transmitted / received. A facsimile machine connected to an unstable line may obtain a received image with low legibility.

Then, when the sender confirms that the image data includes the decoding error and the image data cannot be received and retransmits the data again, the one-dimensional encoding method or the one-dimensional encoding method is selectively used. It is necessary to retransmit by a method with a slow communication speed, which complicates the operation and increases the communication time,
There is a problem that communication efficiency decreases and communication cost increases.

The present invention has been made in view of the above point, and when suppressing the decrease of communication efficiency and the increase of communication cost, when the image is affected by noise, the image is formed by the one-dimensional encoding method. An object of the present invention is to provide a facsimile apparatus which processes data and suppresses deterioration of image legibility.

[0010]

According to another aspect of the present invention, there is provided a facsimile apparatus having a coding processing function of both one-dimensional coding method and two-dimensional coding method and selectively performing the coding processing. In a facsimile device that executes and communicates, a detection unit that detects a decoding error when transmitting and receiving image data, and an identification signal of a partner device that is transmitted and received together with the image data when the decoding error is detected by the detection unit A storage unit for storing the data, a collation unit for collating the identification signal of the partner device with the identification signal stored in the storage unit before transmitting / receiving the image data, and a unit for collating the identification signal by the collation unit. When it is recognized, it is provided with a control means for performing communication processing control for encoding image data by a one-dimensional encoding method.

According to a second aspect of the present invention, in the facsimile apparatus according to the first aspect, when the collating means recognizes that the identification signals match each other, and when the decoding means does not detect a decoding error, It is provided with an accumulating means for accumulating the number of times of communication of image data, and a judging means for erasing the identification signal of the counterpart device stored in the storage means when a decoding error cannot be detected a predetermined number of times through a series of times of communication. is there.

According to a third aspect of the present invention, in the facsimile apparatus according to the first or second aspect, when the non-standard function signal of the partner device is transmitted and received together with the transmission and reception of image data with the partner device, the non-standard function signal is transmitted. Is provided with a recognizing means for recognizing by comparing it with its own non-standard function signal, and when the recognizing means recognizes that the non-standard function signal of the partner device is the same as the own non-standard function signal, The collation means collates the identification signal of the partner device with the identification signal stored in the storage means, and the control means selects the one-dimensional coding system or the two-dimensional coding system.

[0013]

In the facsimile apparatus according to the first aspect of the present invention, the communication processing control for encoding the image data is performed by the two-dimensional encoding method which normally has a short communication time, and the detecting means performs the duplication on the image data being transmitted and received. When a coding error is detected, the collating means collates the identification signal of the partner device with the identification signal stored in the storage means, and when the coincidence is recognized, the image data being transmitted and received by the control means. The communication processing control for performing the encoding processing by the one-dimensional encoding processing is performed.

According to a second aspect of the present invention, in the facsimile apparatus according to the first aspect, when the collating means recognizes that the identification signal matches the identification signal stored in the storage means, the image data When a decoding error is not detected by the detection means during transmission / reception of, the communication number of this image data is integrated by the integration means, and if the decoding error is not detected a predetermined number of times through a series of communication times, the determination means The identification signal of the counterpart device stored in the storage means is erased, and when the image data is newly transmitted / received to / from the device having the same identification signal, the code of the image data is encoded by the two-dimensional encoding method as usual. Communication processing control is performed.

According to a third aspect of the present invention, in the facsimile apparatus according to the first or second aspect, when the non-standard function signal of the device of the communication partner is received during the transmission / reception of the image data, the communication unit is recognized by the recognition means. When the non-standard function signal of and the non-standard function signal of its own are recognized to be the same, the transmission side device compares the identification signal of the partner device with the identification signal stored in the storage device by the collation means, The control means selects the one-dimensional encoding method or the two-dimensional encoding method and processes the image data.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of an embodiment of the facsimile apparatus of the present invention will be described below with reference to the drawings.

In FIG. 1, 1 is a CP as a control means.
In a U (Central Processing Unit), the CPU 1 stores a ROM in which various processing control programs such as a one-dimensional encoding method (MH encoding method) or a two-dimensional encoding method (MR encoding method) described later are stored. (Read-Only Memo
ry) 2 is connected, and is a storage means for receiving and storing various data and image data such as an identification signal and a non-standard function signal of a partner device transmitted from a facsimile device of a communication partner, which will be described later. RAM (Randam
Access Memory) 3 is also connected, and a modem 4 connected to a communication line is connected via a conversion circuit 5.
Then, a scanner 6 for reading a transmission original is connected, and a printer 7 for printing out on a recording paper is also connected.

Further, the ROM 2 includes a detecting means 2a and a collating means.
It has the functions of 2b, integrating means 2c, discriminating means 2d and recognizing means 2e.

That is, the detecting means 2a is a processing control program for detecting a decoding error when transmitting / receiving image data to / from a communication partner device. Further, the matching means 2b uses the detection means 2a to detect the identification signal transmitted / received during the communication by the RAM3.
It is a processing control program for collating with the identification signal of the partner device stored in. Further, the integrating means 2c is a processing control program that integrates the number of times of communication when a decoding error is not detected during communication. The determining means 2d is a processing control program that erases the identification signal of the partner device stored in the storage means when the decoding error cannot be detected a predetermined number of times through a series of communication times. Also, the recognition means 2e
Is a processing control program for determining by comparing the non-standard function signal of the communication partner device with its own non-standard function signal.

Then, the one-dimensional coding method or the two-dimensional coding method is executed by executing each processing control program 2a, 2b, 2c, 2d, 2e such as detection of a decoding error by the detection means 2a and verification of an identification signal by the verification means 2b. The dimensional encoding method is selected and the image data is encoded.

Next, the communication operation of this embodiment will be described.

First, the case where the facsimile apparatus of the present invention is on the transmitting side will be described with reference to the communication procedure diagram of FIG. 2 and the flowchart showing the processing procedure of FIG.

A document to be transmitted is set, the destination device of the transmission destination is called by a calling signal through the public line, and a signal indicating that the destination device responds (CED: Called Station Identif
ication), and further, communication of image data by a non-standard function signal (NSF: Non-Standard Facilities), identification signal (CSI: Called Subscriber Identification) and a two-dimensional encoding method of the partner device is possible. Signal (DIS: Digital Identification Signal)
Is received (step 1). Next, by the matching means 2b, R
It is determined whether or not the identification signal of the partner device is stored in the AM 3 based on the current communication results (step 2).

If the same identification signal is not stored in the RAM 3, the image data is encoded by the two-dimensional encoding method (step 3). Also,
When the collating means 2b recognizes that the same identification signal is stored in the RAM 3, the image data is encoded by the one-dimensional encoding method (step 4).

After that, the image data encoded by the selected encoding method is transmitted (step 5).
That is, the RO of the facsimile apparatus of this embodiment on the transmission side.
Non-standard function signal (NSS: Non-St) stored in M2
andard facilities Set-up), own identification signal (TS
I: Transmitting Subscriber Identification) and a signal (DCS: Digital) indicating that the image data is to be encoded by the one-dimensional encoding method or the one-dimensional encoding method.
Command signal). In addition, the test signal (TC
F) is transmitted, a signal (CFR: Confirmation to Receive) indicating that the preparation for reception is completed is received from the partner device of the transmission destination, and the image data of the transmission original read by the scanner 6 is sent to the collating means 2b. Then, the data is encoded by the set encoding method that is selectively set and transmitted (PIX: pix (p
icture)).

After the image data is transmitted, a signal (EOP: End of Procedures) indicating the end of transmission is transmitted.

Thereafter, a signal (RTN: Retrain Negati) indicating that the other device cannot receive the decoding error is included a predetermined number of times due to the deterioration of the line condition during the transmission of the image data.
ve) is determined (step 6).

When the RTN signal is received,
N = 2 indicating that a decoding error was included more than a predetermined number of times during communication is set in the accumulating means 2c (step 7), the identification signal of the transmission destination is stored in the RAM 3 (step 8), and communication is performed. A signal indicating disconnection (DCN: Disconnect) is transmitted, and the communication ends.

If the RTN signal is not received in step 6, it is judged whether or not the identification signal of the transmission destination is stored in the RAM 3 (step 9). If it is not stored, the DCN signal is stored. Is transmitted, the communication is terminated, and if it is stored, N = N-1 is set to the effect that the decoding error was not included a predetermined number of times during the main communication in the integrating means 1c (step 10). . Further, the decoding means 2c causes a predetermined number of decoding errors, that is, 2 through a series of communication times.
Continuing, N = 0, which means that the decoding error cannot be detected a predetermined number of times, is judged by the judging means 2d (step 11).

When N = 0 indicating that the decoding error cannot be detected a predetermined number of times consecutively, it is recognized that the state of the communication line has been improved, and the transmission destination stored in the RAM 3 is recognized. RA of the identification signal of the other facsimile machine
When it is not erased from M3 (step 12), the DCN signal is transmitted, the communication is terminated, and N = 0 indicating that the decoding error cannot be detected a predetermined number of times in succession, the DCN signal is transmitted. Terminate communication.

Next, the case where the facsimile apparatus of the present invention is on the receiving side will be described with reference to the communication procedure diagram of FIG. 4 and the process flowchart of FIG.

First, in response to the calling signal from the transmitting side device (CED), the non-standard function signal (NS) stored in the ROM 2 of the receiving side facsimile device of this embodiment is used.
F), its own identification signal (CSI), and a signal (DIS) indicating that the encoding process is to be performed by the one-dimensional encoding method or the one-dimensional encoding method.

Next, the non-standard function signal (NS) of the transmitting side device
S), an identification signal (TSI), and a signal (DC) indicating that the processing is performed by the one-dimensional encoding method or the two-dimensional encoding method.
S) is received (step 21) and the test signal (T
CF) is received. Based on these signals, the recognizing means 2e determines from the contents of the NSS signal whether or not the transmitting side device has a function similar to the non-standard function of the receiving side device and is compatible ( Step 22).

When it is determined that the transmitting device is a compatible device, a signal (CFR) indicating that preparation for reception is completed
To perform data communication (step 23). That is, the image data encoded by the encoding method on the transmission side is received (PIX), and at the same time, the signal indicating the end of transmission (EOP) is received.

If it is determined in step 22 that the transmitting side device is not a compatible device, the collating means 2b determines whether or not the identification signal (TSI) of the transmitting side device of this communication is stored in the RAM 3. It is judged (step 24), and if not stored, the reception of the image data is started in step 23.

On the other hand, when the same identification signal is stored, it is judged whether or not the transmitting side device has designated that the image data should be encoded by the two-dimensional encoding method from the received DCS signal. However, if the two-dimensional coding method is not specified (step 25), that is, if the one-dimensional coding method is specified, the reception is performed in step 23. When the two-dimensional coding method is specified, the partner device of this communication recognizes as the facsimile device of the line in which the decoding error was detected during the previous communication, and again receives the NSF signal. A signal (DIS) indicating that only the one-dimensional encoding method can be received is transmitted together with the TSI signal and the TSI signal (step 26), and the process returns to step 21.

Then, again, the NSS signal of the transmitting side device, T
The SI signal and the signal (DCS) indicating that the processing is performed by the one-dimensional encoding method are received, and the test signal (TC
F) is received and a signal (CFR) indicating that reception preparation is completed
Is transmitted and is received in step 23.

Further, when the signal (EOP) indicating the end of transmission is received, it is judged whether or not a decoding error is detected by the detecting means 2a during communication (step 27). When the decoding error is detected more than the predetermined number of times, N = 2 indicating that the decoding error is included more than the predetermined number of times during communication.
Is set in the integrating means (step 28), the identification signal of the transmitting side is stored in the RAM 3 (step 29), a signal (RTN) indicating that reception is not possible is transmitted, and a signal indicating that communication is disconnected (D
CN) is received and the communication is terminated.

On the other hand, when it is determined in step 27 that the decoding error is not detected a predetermined number of times, it is determined whether or not the identification signal of the transmitting side is stored in the RAM 3 (step
30) If not stored, the DCN is received, the received image data is printed out by the printer 7, and the communication is ended. If it is stored, the integrating means 2c
Then, N = N-1 is set to the effect that a decoding error has not been included more than a predetermined number of times during this communication (step 31). Further, the discriminating means 2d determines N = 0, which indicates that the accumulating means 2c cannot detect the decoding error a predetermined number of times through a series of communication times, that is, two consecutive decoding errors cannot be detected (step 32). To do.

If N = 0 indicating that the decoding error cannot be detected a predetermined number of times in succession, it is recognized that the state of the communication line has been improved, and the transmission side stored in the RAM 3 is stored. The identification signal of the facsimile machine of the RAM3
Is erased (step 33), the DCN signal is received, the image data is printed out, and the communication is ended. Further, N = 0 indicating that the decoding error cannot be detected a predetermined number of times consecutively.
If not, the DCN signal is received, the image data is printed out, and the communication ends.

In the above embodiment, in the case of normal communication in which the state of the communication line is stable, the image data is processed by the two-dimensional encoding method with a short communication time and the communication is performed. Also, when a decoding error is detected during communication and the identification signal of the communication device matches the identification signal stored in the RAM 3, that is, the facsimile apparatus is likely to cause a decoding error because the line state is unstable. If you recognize that you are connected,
The setting for encoding processing by the one-dimensional encoding method is performed so that the readability of the image printed out is not easily impaired even when affected by the decoding error.

Therefore, during normal communication, the communication time can be shortened and the communication cost can be reduced. When connecting to the partner facsimile machine in which the line condition is unstable, the one-dimensional encoding method is used from the beginning. , While keeping the image legibility as good as possible, set the one-dimensional encoding method,
Also, since communication is prevented from being redone, communication efficiency can be improved.

If the decoding error is no longer detected after two consecutive communications, it is recognized that the line condition has been improved, the identification signal of the communication partner is erased from the RAM 3, and the subsequent steps are performed. At the time of communication, since the two-dimensional encoding method with a short communication time is set again and the image data is transmitted and received, the encoding method is automatically set again, communication efficiency can be improved, and communication cost can be reduced. It can be reduced.

Further, when it is recognized that the non-standard function of the communication partner and the non-standard function of the self are the same and compatible,
At the transmitting side device, it is judged whether or not the line is likely to cause a decoding error, and if it is judged as the partner device connected to a stable line, a two-dimensional coding method with a short communication time is set, When it is determined that the partner device is connected to the unstable line, the one-dimensional encoding method is used from the beginning.

Therefore, it is not necessary for the receiving side facsimile device to judge whether the line is prone to decoding error or not, and to select the coding method, and the communication time is shortened by shortening the response time. Therefore, the communication cost can be reduced.

In the above embodiment, when the image data is affected by the decoding error during the communication, N indicating that the decoding error is included more than the predetermined number of times during the communication.
= 2 is set in the accumulating means 2c, and if the communication is not affected by the decoding error more than a predetermined number of times in succession, R
Although it has been described that the identification signal of the communication partner is erased from the AM3 and the communication is performed by setting the two-dimensional encoding method in the subsequent communication, the communication is not limited to two times but a series of predetermined times of communication. When a decoding error cannot be detected more than once, the two-dimensional coding method may be set.

[0047]

According to the facsimile apparatus of the first aspect, the communication processing control for coding the image data is performed by the two-dimensional coding method which normally has a short communication time, and the decoding error is detected. At this time, when the new identification signal transmitted / received at the time of transmitting / receiving new image data matches the identification signal stored in the storage means, the image data is processed by the one-dimensional encoding process, While suppressing a decrease in communication efficiency and an increase in communication cost, it is possible to suppress a decrease in image legibility by the one-dimensional encoding method when affected by a decoding error.

According to the second aspect of the present invention, in the facsimile apparatus according to the first aspect, when the identification signal and the identification signal stored in the storage unit match, a decoding error occurs through a series of communication times. When the image signal is not detected a predetermined number of times, the identification signal stored in the storage means is erased, and when transmitting / receiving image data to / from a device having a new identical identification signal, a two-dimensional encoding method with a short transmission time is used. Since communication processing control for encoding the image data is performed, communication efficiency can be improved and communication cost can be reduced.

According to the third aspect of the present invention, in the facsimile apparatus according to the first aspect or the second aspect, when the non-standard function of the communication partner device is the same as its own non-standard function, the sending side device uses the collating means. Since the identification signal is collated, the encoding method is selected, and the communication processing control for encoding the image data is performed, the communication time can be shortened by shortening the response time, and the communication cost can be reduced.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a facsimile apparatus of the present invention.

FIG. 2 is an explanatory diagram of a protocol showing a communication procedure when the above-mentioned facsimile apparatus is on the transmitting side.

FIG. 3 is a flowchart showing a processing procedure of the above.

FIG. 4 is an explanatory diagram of a protocol showing a communication procedure when the facsimile device is on the receiving side.

FIG. 5 is a flowchart showing a processing procedure of the above.

[Explanation of symbols]

 1 CPU as control means 2a Detecting means 2b Collating means 2c Accumulating means 2d Discriminating means 2e Recognizing means 3 RAM as storing means

[Procedure amendment]

[Submission date] July 27, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0002

[Correction method] Change

[Correction content]

[0002]

2. Description of the Related Art Conventionally, a facsimile apparatus of this type transmits and receives a test signal (Training Check : TCF) through a communication line such as a public line or a specific line, and the noise may occur due to, for example, deterioration of the line state. Confirm that the image data to be sent and received is not disturbed, and the one-dimensional coding method (MH coding method) or two-dimensional coding method (MR coding method) recommended by the International Telegraph and Telephone Consultative Committee (CCITT) is recommended . ), the image data to be transmitted encoding process, the received image data printed out at decrypted by the printer.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] 0025

[Correction method] Change

[Correction content]

After that, the image data encoded by the selected encoding method is transmitted (step 5).
That is, the RO of the facsimile apparatus of this embodiment on the transmission side.
Non-standard function signal (NSS: Non-St) stored in M2
andard facilities Set-up), own identification signal (TS
I: Transmitting Subscriber Identification) and a signal (DCS: Digital) indicating that the image data is to be encoded by the one-dimensional encoding method or the two- dimensional encoding method.
Command signal). In addition, the test signal (TC
F) is transmitted, a signal (CFR: Confirmation to Receive) indicating that the preparation for reception is completed is received from the partner device of the transmission destination, and the image data of the transmission original read by the scanner 6 is sent to the collating means 2b. selectively transmits the processed encoded by the set marks Goka method Te (PIX: pix (picture)
).

[Procedure 3]

[Document name to be amended] Statement

[Name of item to be corrected] 0029

[Correction method] Change

[Correction content]

If the RTN signal is not received in step 6, it is judged whether or not the identification signal of the transmission destination is stored in the RAM 3 (step 9). If it is not stored, the DCN signal is stored. Is transmitted to terminate the communication, and if it is stored, N = N-1 is set to the effect that the decoding error was not included a predetermined number of times during the main communication in the integrating means 2c (step 10). . Further, the decoding means 2c causes a predetermined number of decoding errors, that is, 2 through a series of communication times.
Continuing, N = 0, which means that the decoding error cannot be detected a predetermined number of times, is judged by the judging means 2d (step 11).

[Procedure amendment 4]

[Document name to be amended] Statement

[Name of item to be corrected] 0032

[Correction method] Change

[Correction content]

First, in response to the calling signal from the transmitting side device (CED), the non-standard function signal (NS) stored in the ROM 2 of the receiving side facsimile device of this embodiment is used.
F), its own identification signal (CSI), and a signal (DIS) indicating that the encoding process is to be performed by the one-dimensional encoding method or the two- dimensional encoding method.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0036

[Correction method] Change

[Correction content]

On the other hand, when the same identification signal is stored, it is judged whether or not the transmitting side device has designated that the image data should be encoded by the two-dimensional encoding method from the received DCS signal. However, if the two-dimensional coding method is not specified (step 25), that is, if the one-dimensional coding method is specified, the reception is performed in step 23. When the two-dimensional coding method is specified, the partner device of this communication recognizes as the facsimile device of the line in which the decoding error was detected during the previous communication, and again receives the NSF signal. A signal (DIS) indicating that only the one-dimensional encoding method can be received is transmitted together with the CSI signal and the CSI signal (step 26), and the process returns to step 21.

Claims (3)

[Claims] 1. A facsimile apparatus having both one-dimensional encoding method and two-dimensional encoding method encoding processing function, selectively executing the encoding processing and communicating, and transmitting and receiving image data. Detection means for sometimes detecting a decoding error, storage means for storing an identification signal of the partner device which is transmitted and received together with the image data when the decoding error is detected by the detection means, and before and after the transmission and reception of the image data A collating unit that collates the identification signal of the partner device with the identification signal stored in the storage unit, and a one-dimensional encoding method for the image data when the collating unit recognizes that the identification signal matches. And a control means for performing communication processing control for encoding processing in 1. 2. When the matching means recognizes that the identification signals match, and when the decoding means does not detect a decoding error, an integrating means for integrating the number of communication times of the image data, and a series of communication. 2. The facsimile apparatus according to claim 1, further comprising: a discriminating unit that erases the identification signal of the partner device stored in the storage unit when the decoding error cannot be detected a predetermined number of times. 3. When the non-standard function signal of the partner device is transmitted and received along with the transmission and reception of the image data with the partner device,
When the non-standard function signal of the partner device is recognized to be the same as the self non-standard function signal by the recognition means, the non-standard function signal is compared with the own non-standard function signal for recognition. , The transmission side device compares the identification signal of the counterpart device with the identification signal stored in the storage device by the collating means, and the control means selects one-dimensional coding method or two-dimensional coding method. The facsimile apparatus according to claim 1 or 2, characterized in that: