JPH0767135B2 - Image communication method - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for communicating image information, and more particularly to an image communication method for efficiently transmitting image information from a receiving device to a transmitting device.

Conventional Technology Conventionally, CCITT Recommendation T.30 has been used as such an image communication method.
A method is known in which the image information is transmitted from the facsimile apparatus A to the facsimile apparatus B by using the non-standard procedure of No. 1 and then the transmission right is reversed and the image information is transmitted from the facsimile apparatus B to the facsimile apparatus A. There is. The sequence diagram is shown in FIG.

In this method, between the calling station (facsimile device A) and the called station (facsimile device B), CNG (ring tone), CED (2100 Hz called station identification signal), NSF (non-standard function signal) , CSI (Called Terminal Identification Signal), DIS (Digital Identification Signal) exchange, communication mode is transmitted by NSS (Nonstandard Function Setting Signal) from the calling station, followed by TSI (Transmission Terminal Identification Signal), TCF (modem training signal) is transmitted. When CFR (reception preparation confirmation signal) is returned, a facsimile message is sent from the calling station. When the end of the facsimile message and the return to phase B (pre-message procedure) are notified by EOM (end of message), the called station returns MCF (message confirmation signal) and after 6 seconds, NSF, CSI, DIS Is sent, and the calling station sends NSC (non-standard function command signal), CIG (calling station identification signal), and DTC (digital transmission command). With this, the transmission right is reversed, and NSS, TSI,
When TCF is sent and CFR is returned, a facsimile message is sent. When this ends, EOP (procedure end signal) and M
Communication is ended by exchanging CF, sending DCN and disconnecting the line.

According to this method, since the image information can be transmitted from the receiving side device without determining the line, after the line is disconnected at the receiving side device, another call is made and communication is performed as the transmitting side device. Obviously, it is more efficient than doing it.

However, since it is necessary to mutually confirm that there is image information to be transmitted to the receiving side device in the first phase B, if the image information to be transmitted does not occur at the time of confirmation, it is desired to transmit after the start of reception. Even if the image information is generated, there is a problem that the line is disconnected and the communication is ended when the reception is completed, and the image information cannot be transmitted from the receiving side device.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an image communication method capable of expanding the range of image information that can be continuously transmitted in a receiving device without disconnecting the line. And

Means for solving the problem In the image communication method using the non-standard procedure of CCITT Recommendation T.30, the message of the image information is transmitted to the transmitting side device after the receiving side device starts receiving the image information message. The presence or absence of image information to be transmitted, and when there is image information to be transmitted, by sending a post message response command in which the information of the transmission right request is set to the transmission side device, thereby communicating with the transmission side device. In this configuration, the transmission right is reversed and the message of the image information is transmitted.

Operation According to the present invention, if there is image information to be transmitted at the end of reception in the receiving side device, the transmission right is inverted and the image information is transmitted. That is, in the receiving side device, not only the image information generated before the start of the reception but also the image information generated between the start and the end of the reception can be continuously transmitted without disconnecting the line.

Embodiment A procedure of facsimile communication according to an embodiment of the present invention will be described with reference to the sequence diagram shown in FIG. Signal abbreviations are according to CCITT Recommendation T.30.

CNG (ring tone), CED (21) between the calling station (sending side fax machine) and the called station (receiving side fax machine)
00Hz called station identification signal), NSF (non-standard function signal), CSI
(Called terminal identification signal), DIS (digital identification signal) are converted, and then the communication mode is transmitted to the called station by NSS (non-standard function setting signal), followed by TSI (transmission terminal identification signal), When a TCF (modem training signal) is sent and a CFR (reception preparation confirmation signal) is returned from the called station, sending of a facsimile message (image information) from the calling station starts.

When the sending of the facsimile message from this calling station is completed (in the case of continuous transmission of multiple sheets, when the sending of the facsimile message of the last page is completed), the calling station sends an EOP (procedure end signal). It If this facsimile message is successfully received, the called station returns MCF (message confirmation signal) as a post message response command. At this point, it checks whether there is image information to send to the calling station and it exists. At times, the transmission right request is transmitted to the calling station by being carried on the post message response command.

Specifically, the frame structure of the post message response command is changed as shown in FIG. That is, the flag field F, the address field A, the control field C, which the conventional post message response command has,
In addition to the facsimile control field (MCF, RTN, RTP, PIN, or PIP is set, MCF is set here), the frame structure has a facsimile information field FIF. Then, the transmission right request information is set in the facsimile information field FIF.

The facsimile message from the calling station includes information (document number, code number, etc.) for extracting the image information from the called station side. Based on this information, the called station can determine whether the stored image information is image information to be transmitted to the calling station.

Now, at the calling station, the post message response command (MC
If the right request information is set in F), NSC (non-standard function command signal), CIG (calling station identification signal), and DTC (digital transmission command signal) are sent in order, and Set the communication mode by NSS (non-standard function setting signal) from the calling station. This reverses the transmission right, and the called station has the transmission right.

The called station sends TSI (transmitting terminal identification signal) and TCF (training signal), and the calling station sends CFR (reception preparation confirmation signal).
When is returned, the transmission of the facsimile message of the image information to be transmitted to the calling station is started. When the transmission of this facsimile message is completed (when the transmission of the last page is completed in the case of multiple pages), the called station performs EOP (procedure end signal).
Is sent, and when MCF (message confirmation signal) is returned, DCN (disconnect command signal) is sent, the line is disconnected, and a series of communication ends.

If the calling station wants to retransmit after receiving a facsimile message from the called station, it must set the transmission right request information in the post message response command (MCF) and transmit it to the called station. Thus, it is possible to reacquire the transmission right by a procedure similar to the procedure described above (the positions of the calling station and the called station are reversed).

FIG. 3 is a schematic configuration diagram of a facsimile apparatus that executes the above-described facsimile communication method. 1 is a reading unit for reading a transmission original, 2 is a recording unit for recording received image information and the like, 3 is a panel unit for operating and displaying the apparatus, 4 is restoration of received data and encoding of transmitted data The CODEC section 5 for performing the above is a line control section including a network control circuit and a modem, 6 is an image memory section for storing image information, and 7 is a main control section for controlling the entire apparatus. Such a configuration is basically the same as the configuration of a conventional general facsimile apparatus, but the control algorithm of the main control unit 7 is partially changed to transmit the image information by the transmission right inversion as described above. There is.

When such a facsimile machine is used as a calling station and a called station, the facsimile communication described with reference to FIG. 1 is executed as follows.

In the facsimile device of the called station, the main control unit 7 executes the procedure shown in FIG. 1 with the calling station via the line control unit 5, and the received facsimile message is restored by the CODEC unit 4 and restored. The obtained image information is stored in the image memory unit 6. Further, the main control unit 7 also recognizes information (document number, code number, etc.) for extracting the image information included in the facsimile message from the calling station. And
Based on this information, whether or not the image information to be transmitted to the calling station exists in the image memory unit 6 is checked when the EOP from the calling station is received. When the image information to be transmitted to the calling station exists, the main control unit 7 sends a post message response command (MCF) in which the information of the transmission right request is set,
The transmission right is inverted by the procedure shown in FIG. 1, and the image information is encoded by the CODEC unit 4 and sent out through the line control unit 5. If there is no image information that can be extracted by the information for extracting the image information from the calling station, the procedure of terminating the communication is executed without proceeding to the procedure of the transmission right request.

The image information to be transmitted to the calling station is input from the reading unit 1 or from another facsimile apparatus via the line control unit 5 by the time of the presence / absence check, and the image information is sent to the image memory unit 6.
It has been accumulated in.

In the facsimile machine of the calling station, the main control unit 7 executes the procedure shown in FIG. 1 with the called station via the line control unit 5, and the image information or the image memory unit directly input from the reading unit 1 is executed. The image information stored in 6 is encoded by the CODEC unit 4 and sent from the line control unit 5. Then, the post message response command (MCF) from the called station is analyzed, and if the transmission right request information is set, if the facsimile message can be received, the transmission right inversion shown in FIG. 1 is performed. Then, the facsimile message received from the called station is restored by the CODEC unit 4 and stored in the image memory unit 6. When the transmission right request is not set, the main control unit 7 does not proceed to the transmission right inversion procedure,
Perform the procedure for ending communication.

EFFECTS OF THE INVENTION As is apparent from the above description, according to the present invention, at the receiving side device, the presence or absence of image information to be transmitted to the transmitting side device is checked at the end of reception of the image information message, and if it exists, the transmission right Image information that can be transmitted from the receiving side device without disconnecting the line to notify the request to the transmitting side device and invert the transmission right with the transmitting side device and send the image information message. This has the effect of expanding not only the image information generated before the start of reception but also the image information generated between the start and the end of reception.

[Brief description of drawings]

FIG. 1 is a sequence diagram of a facsimile communication method according to an embodiment of the present invention, FIG. 2 is a frame configuration diagram of a post message response command with a facsimile information field added, and FIG. 3 is a schematic configuration diagram of a facsimile device. The figure is a sequence diagram of a conventional facsimile communication method. 1 ... reading unit, 2 ... recording unit, 3 ... panel unit, 4 ...
CODEC section, 5 ... Line control section, 6 ... Image memory section, 7
...... Main control unit.

Claims (1)

[Claims] 1. In an image communication method using a non-standard procedure of CCITT Recommendation T.30, an image to be transmitted to a transmission side device between the start of reception of a message of image information at the reception side device and the end of reception. The presence / absence of information is checked, and when there is image information to be transmitted, a post message response command in which information of a transmission right request is set is sent to the transmitting side device, thereby transmitting with the transmitting side device. Reverse the right,
An image communication method characterized by transmitting a message of the image information.