JP6733264B2 - Image processing device and communication device - Google Patents

Description

The present invention relates to an image processing device and a communication device.

Japanese Unexamined Patent Application Publication No. 2004-242242 discloses, as an image processing apparatus, a multifunction peripheral capable of executing wireless communication with a mobile terminal. In this multifunction device, the authentication information necessary for user authentication is acquired from the mobile terminal, and the user authentication is performed based on the acquired authentication information and the permission information that is the authentication information of the user who is permitted to use the own device. This prevents spoofed logins.

JP, 2005-103162, A

By the way, as the image processing apparatus, there is also known an apparatus that transmits and receives data to and from a mobile terminal by using a wireless communication system in which devices are connected to each other without a relay device. This type of wireless communication system is, for example, wireless communication in an ad hoc mode in which devices are directly connected without going through an access point, or a type of Wi-Fi (registered trademark) that allows a device to have an access point function. Therefore, there is Wi-Fi Direct (registered trademark) that allows devices to be directly connected to each other.

By using a wireless communication system that connects such devices to each other without using a relay device, it is possible to easily establish a wireless communication environment with a mobile terminal, but on the other hand, security is reduced due to the absence of a relay device. To do. Therefore, for example, when the image processing apparatus transmits/receives data to/from a portable terminal in which an unauthorized program is installed, an abnormality such as outflow of data in the image processing apparatus may occur.

In the multi-function peripheral described in Patent Document 1, it is possible to prevent spoofed login, but if the malicious program is installed in the mobile terminal regardless of the user's intention, the data in the multi-function peripheral will be deleted. Outflow to the outside occurs, and the abnormality cannot be detected.

Therefore, an object of the present invention is to provide an image processing device and a communication device capable of determining that an abnormality has occurred in the transmission/reception process in the data transmission/reception process by wireless communication without passing through a relay device. is there.

In order to solve the above problems, an image processing apparatus according to a first aspect of the present invention is an image processing apparatus capable of communicating with a mobile terminal, and a communication unit for performing wireless communication with the mobile terminal. When receiving image data from the mobile terminal by wireless communication not via a relay device, a threshold of the communication amount of a response signal to be transmitted to the mobile terminal in response to the reception of the image data for a certain period is set. The storage unit for storing, an image recording unit for recording an image on a recording medium according to the image data received from the mobile terminal, and a control unit for controlling the communication unit, the control unit , A transmission/reception process of receiving image data from the mobile terminal by wireless communication without passing through the relay device and transmitting the response signal to the mobile terminal in response to the reception, and the relay at the time of the transmission/reception process. A monitoring process for monitoring the communication amount of the response signal transmitted to the mobile terminal by wireless communication without passing through a device, and the communication amount of the response signal monitored by the monitoring process for the certain period is the threshold value. When the value exceeds the limit, the image processing apparatus performs an illegitimate process and executes a determination process of determining that the transmission/reception process is abnormal.

An image processing apparatus according to a second aspect of the present invention is an image processing apparatus capable of communicating with a mobile terminal, and is recorded in a communication unit for performing wireless communication with the mobile terminal and a recording medium. When transmitting an image to an image reading unit that reads an image and generates image data related to the image and the image data generated by the image reading unit to the mobile terminal by wireless communication without passing through a relay device, this transmission In response to the response signal received from the mobile terminal, the storage unit for storing a threshold value of the communication amount of the response signal for a certain period, and a control unit for controlling the communication unit, wherein the control unit is the relay. A transmission/reception process of transmitting image data to the mobile terminal by wireless communication not via a device and receiving the response signal from the mobile terminal in response to the transmission, and a transmission/reception process via the relay device during the transmission/reception process. Monitoring processing for monitoring the communication amount of the response signal received from the mobile terminal by wireless communication for a certain period, and when the communication amount of the response signal monitored by the monitoring process for the certain period exceeds the threshold value. And a determination process of determining that an abnormal process is performed in the mobile terminal and an abnormality occurs in the transmission/reception process.

Further, the communication device of the present invention is a communication unit for performing wireless communication with a communication target device, and a communication unit for wireless communication between the communication target device and the communication target device from a transmission source to a reception source. A storage unit for storing a threshold value of a communication amount of a response signal transmitted from the reception source to the transmission source in response to the transmission of the data when transmitting the data to the communication unit; And a control unit for controlling a unit, the control unit transmitting data from a transmission source to a reception source by wireless communication with the communication target device without passing through the relay device, and transmitting the data. In response to the transmission/reception process of transmitting the response signal from the reception source to the transmission source, and in the transmission/reception process, the response transmitted from the reception source to the transmission source by wireless communication without passing through the relay device. Monitoring processing for monitoring the communication amount of the signal for the certain period, and when the communication amount of the response signal monitored by the monitoring process for the certain period exceeds the threshold value , an unauthorized process is performed at the receiving source. And a determination process for determining that the transmission/reception process is abnormal.

Since the response signal has a small amount of data, the communication amount of the response signal for a certain period is usually less than or equal to a predetermined threshold value. Therefore, when the communication amount of the response signal for a certain period exceeds the threshold value, there is a high possibility that the data is illegally transmitted from the data receiving source to the transmitting source. In the present invention, by monitoring the communication amount of the response signal for a certain period, it is possible to determine that an abnormality has occurred when the communication amount for the certain period exceeds the threshold value.

It is an electric block diagram of a compound machine. It is an electric block diagram of a portable terminal. FIG. 7 is an operation flow diagram of the multifunction peripheral related to an image recording instruction. It is a sequence diagram which shows the procedure of the data communication between a portable terminal and a multifunctional device which concerns on an image recording instruction. It is an operation|movement flowchart of the multifunctional device which concerns on a modification. FIG. 9 is an operation flow diagram of the multifunction peripheral related to the image reading instruction. FIG. 6 is a sequence diagram showing a procedure of data communication between a mobile terminal and a multifunction peripheral related to an image reading instruction.

Hereinafter, the image processing apparatus and the communication apparatus of the present invention will be described with reference to the drawings, applied to a multi-function peripheral (MFP: Multi-Function Peripheral) 1.

The multifunction machine 1 is an image processing apparatus having an image recording function and an image reading function (scanner function), and as shown in FIG. 1, an image recording mechanism 11, an image reading mechanism 12, a user interface 13, a communication interface 14, and A control device 50 for controlling these is provided.

The image recording mechanism 11 is an inkjet type or laser type printing mechanism, and records an image according to the image data on a recording medium such as a sheet according to an instruction from the control device 50. The image reading mechanism 12 is an image reading mechanism such as a CCD or CIS, and according to an instruction from the control device 50, reads an image recorded on a recording medium such as paper and generates image data related to the image.

The user interface 13 is an interface for outputting information to the user and receiving an input from the user, and includes operation keys 13a and a display 13b (output device). The operation key 13a receives an input from the user and outputs it to the control device 50. The display 13b displays (outputs) various information according to an instruction from the control device 50.

The communication interface 14 is an interface for transmitting/receiving data to/from an external terminal such as a mobile terminal 100 such as a mobile phone or a PC 250 by wireless or wired. The communication interface 14 includes a wired network interface 15 (hereinafter, wired network I/F 15), an NFC interface 16 (hereinafter, NFC I/F 16), and a wireless network interface 17 (hereinafter, wireless network I/F 17). ..

The wired network I/F 15 is connected to the router 80 having a hub function via a LAN line. Then, the wired network I/F 15 can perform data communication with the PC 250 on the same network via the router 80. Further, the wired network I/F 15 can perform data communication with the server 90 on the Internet 85 via the router 80. The router 80 has a function of an access point for wireless communication, and the wired network I/F 15 is configured to use the router 80 to perform wireless communication with the mobile terminal 100. Good.

The NFC I/F 16 is an interface for performing near field communication (hereinafter, referred to as NFC communication) by a communication method of NFC (Near Field Communication) standard. The NFC standard is an international standard of ISO/IEC21481 or ISO/IEC18092. NFC communication is short-distance wireless communication in which a communication distance is an extremely short distance of about 10 cm, and communication is established by bringing (approaching) a transmission source device and a reception source device close to each other. Since NFC communication has a low communication speed, it is used for communication of a relatively small amount of data. Further, in the case of NFC communication, it is easy to specify the communication partner due to the physical limitation of the communicable distance, and the communication can be easily established correspondingly. For example, when establishing NFC communication between the multi-function peripheral 1 and the mobile terminal 100, the user needs to bring the mobile terminal 100 close to the multi-function peripheral 1 which is a communication target device. Will be designated, and NFC communication will be established.

The wireless network I/F 17 can execute wireless communication in the infrastructure mode via the access point 95 which is a relay device. In addition, the wireless network I/F 17 can execute wireless communication of a Wi-Fi direct system (hereinafter, WFD communication), which is one type of wireless communication system that does not use a relay device such as an access point. This WFD communication is local wireless communication with a communicable distance of several meters to several tens of meters.

Here, the WFD communication is a communication method that establishes a wireless network and enables data to be transferred within the wireless network. Therefore, in order to perform data communication between the communication target devices of the transmission source and the reception source, it is necessary to construct a wireless network. Therefore, in the present embodiment, when NFC communication is established between the multifunction device 1 and the mobile terminal 100, connection information for establishing WFD communication is transmitted and received between the multifunction device 1 and the mobile terminal 100. To do. Then, based on this connection information, WFD communication is established (so-called handover) between the multifunction device 1 and the mobile terminal 100.

The control device 50 has a CPU 51 and a memory 52. The memory 52 is composed of a ROM, a RAM, a flash memory, etc., and stores a program executed by the CPU 51. The memory 52 is used as a work area in which various programs are read or a storage area for temporarily storing data. Further, the memory 52 stores a threshold value described later.

Next, the mobile terminal 100 that is a communication target device of the multi-function peripheral 1 will be described. As shown in FIG. 2, the mobile terminal 100 includes a touch panel 101, an NFC I/F 102, a wireless network I/F 103, and a control device 120 that controls these.

The touch panel 101 displays information to the user and accepts input from the user. The NFC I/F 102 is an interface that enables NFC communication, like the NFC I/F 16 of the multifunction peripheral 1. The wireless network I/F 103 is an interface that enables wireless communication in the infrastructure mode and WFD communication, like the wireless network I/F 17 of the multifunction peripheral 1.

The control device 120 includes a CPU 121 and a memory 122. The memory 122 can store image data. Further, in the memory 122, an application program (hereinafter referred to as an application) for giving instructions such as an image recording instruction and an image reading instruction to the multi-function peripheral 1 is installed. The mobile terminal 100 can cause the multifunction device 1 to execute various processes according to an instruction when NFC communication is established with the multifunction device 1 while the application is activated.

In the present embodiment, when the user brings the mobile terminal 100 close to the multi-function peripheral 1 in a state where the application for issuing the image recording instruction is activated, the mobile communication is performed by WFD communication switched from NFC communication by handover. Image data is transmitted from the terminal 100 to the multifunction device 1. Then, in the multifunction device 1, an image recording process of recording an image on a recording medium is executed according to the image data received from the mobile terminal 100.

Further, when the user brings the mobile terminal 100 close to the multi-function peripheral 1 in a state where the application for issuing the image reading instruction is activated, the multi-function peripheral 1 reads the image recorded on the recording medium and displays the image. An image reading process for generating the image data is executed. After that, the image data generated in the image reading process is transmitted from the multifunction device 1 to the mobile terminal 100 by the WFD communication switched from the NFC communication by the handover.

By the way, when a malicious program is stored in the memory 122 of the mobile terminal 100 and the malicious program is transmitted to the multi-function peripheral 1, an abnormality such as data leakage in the memory 52 of the multi-function peripheral 1 may occur. Here, as described above, in the case of wireless communication using relay devices such as the access point 95 and the router 80, the security function of these relay devices prevents an unauthorized program from the portable terminal 100 from entering the multifunction device 1. It is possible to prevent

On the other hand, in the case of WFD communication, since it is wireless communication that does not go through a relay device, security is lower than wireless communication that goes through a relay device. Therefore, in the case of WFD communication, there is a high possibility that an unauthorized program from the mobile terminal 100 will enter the multi-function peripheral 1, and the multi-function peripheral 1 is likely to malfunction. Therefore, regarding the above-described image recording instruction and image reading instruction, when the image data is transmitted and received between the mobile terminal 100 and the multifunction device 1 by WFD communication, the malicious program transmitted from the mobile terminal 100 is combined. There is a risk of entering the machine 1.

Here, it is conceivable to introduce security software into the multi-function peripheral 1 to detect the intrusion of malicious programs, but it is necessary to constantly update the security software in order to deal with various malicious programs. Will grow. Even if security software is introduced, it is not always possible to detect all intrusions of malicious programs.

Therefore, in the present embodiment, when image data is transmitted/received between the mobile terminal 100 and the multifunction device 1 by WFD communication, the CPU 51 of the multifunction device 1 transfers the image data from the reception source to the transmission source. Monitor the amount of communication of the response signal transmitted for a certain period of time. Then, the CPU 51 is configured to determine that an abnormality has occurred in transmission/reception of image data when the communication amount of the response signal for a certain period of time exceeds a predetermined threshold value (upper limit value). The details will be described below.

Note that the communication volume of the response signal for a certain period of time is the communication volume of the response signal per unit time or the total communication volume of the response signal during the period from the start of transmission/reception of image data to the current time. Is. In the following description, the communication amount of the response signal for a certain period of time is described as the communication amount of the response signal per unit time.

The response signal is a response signal such as an ACK (Acknowledgements) signal or a NACK (Negative ACKnowledgement) signal that is transmitted from the reception source to the transmission source in response to the reception of data. The ACK signal is a response signal transmitted from the reception source to the transmission source when the reception source normally receives the data when transmitting/receiving the data. NACK is a response signal transmitted from the receiving source to the transmitting source when the receiving source does not normally receive the data during data transmission/reception.

Normally, these response signals have a small amount of data, unlike image data, so that the amount of communication of the response signal transmitted from the data receiving source to the transmitting source is small during a certain period. However, when the malicious program is transmitted from the mobile terminal 100 to the multi-function peripheral 1, the amount of data transmitted from the image data receiving source to the transmitting source increases, and the communication amount of the response signal for a certain period of time increases. Will increase.

For example, when the mobile terminal 100 issues an image recording instruction to the multifunction device 1, the image data is transmitted from the mobile terminal 100 to the multifunction device 1 by WFD communication. At this time, when the data stored in the memory 52 of the multi-function peripheral 1 is illegally transmitted to the mobile terminal 100 by the WFD communication, the communication amount of the response signal for a certain period increases.

In addition, when the mobile terminal 100 issues an image reading instruction to the multifunction device 1, the image data is transmitted from the multifunction device 1 to the mobile terminal 100 by WFD communication. At this time, when the malicious program is transmitted from the mobile terminal 100 to the multi-function device 1 by the WFD communication, the communication amount of the response signal for a certain period increases.

As described above, in the transmission/reception process for transmitting/receiving the image data and the response signal between the mobile terminal 100 and the multifunction device 1, when the communication amount of the response signal is large for a certain period, an abnormality occurs in the transmission/reception process. There is a high possibility that Therefore, in the present embodiment, the CPU 51 of the multi-function peripheral 1 determines that an abnormality has occurred in the transmission/reception processing when the communication amount of the response signal for a certain time exceeds the predetermined threshold value stored in the memory 52. Is configured to. As will be described in detail later, the threshold value stored in the memory 52 is changed according to the communication speed of WFD communication between the mobile terminal 100 and the multifunction device 1.

Here, during the transmission/reception processing, the communication amount of the response signal for a certain time may exceed the threshold value due to factors other than the malicious program. Therefore, in the present embodiment, the CPU 51 of the multi-function peripheral 1 is configured to inquire of the server 90 (external device) whether or not the determination is correct when it is determined that an abnormality has occurred in the transmission/reception processing. The details will be described below.

When determining that an abnormality has occurred in the transmission/reception processing, the CPU 51 transmits abnormality candidate information related to the determined abnormality to the server 90 via the Internet 85. The abnormality candidate information includes various pieces of information necessary for the server 90 to judge whether or not the above determination by the CPU 51 is correct. For example, in the abnormality candidate information, the communication amount of the response signal for a certain period and the threshold value stored in the memory 52 when it is determined that an abnormality has occurred in the transmission/reception processing, and the multifunction device 1 and the mobile terminal 100. Information such as the communication speed between the two and the content of the instruction (the image recording instruction or the image reading instruction) that the mobile terminal 100 has given to the multifunction device 1 is included.

The server 90 includes a control device 91 and a database 92, as shown in FIG. The database 92 stores a plurality of pieces of abnormality information relating to abnormalities that may occur in the transmission/reception processing. Each of these pieces of abnormality information includes information about a phenomenon that may occur in the transmission/reception process when an unauthorized program is transmitted from the mobile terminal 100 to the multifunction device 1 by WFD communication. Therefore, this abnormal information includes, for example, the communication amount of the response signal for a certain period and the threshold value stored in the memory 52 when the malicious program is transmitted from the mobile terminal 100 to the multifunction device 1 by WFD communication. In addition, the communication speed between the multifunction device 1 and the mobile terminal 100, and the instruction content (the image recording instruction or the image reading instruction) performed by the mobile terminal 100 to the multifunction device 1 are included. Further, the abnormality information stored in the database 92 is configured to be updated with new contents every predetermined period.

When the abnormality candidate information is received from the multi-function peripheral 1, the control device 91 of the server 90 determines whether the abnormality candidate information matches any of the abnormality information stored in the database 92, and thus the abnormality candidate information. It is determined whether or not the abnormality determination in the multi-function peripheral 1 is correct. After that, the control device 91 transmits the determination result to the multi-function peripheral 1 via the Internet 85. As a result, the CPU 51 of the multifunction device 1 can more accurately determine whether or not an abnormality has occurred in the transmission/reception processing.

Next, an example of a process executed by the CPU 51 of the multifunction machine 1 according to the program recorded in the memory 52 when receiving an image recording instruction from the mobile terminal 100 will be described with reference to FIG.

First, when the mobile terminal 100 is brought close to the multifunction device 1, the CPU 51 controls the NFC I/F 16 to establish NFC communication with the mobile terminal 100 (A1). At this time, the WFD connection information necessary for establishing the WFD communication is transmitted and received between the mobile terminal 100 and the multifunction device 1 through this NFC communication. The multifunction device 1 also receives an image recording instruction from the mobile terminal 100 by NFC communication.

Next, the CPU 51 controls the wireless network I/F 17, and uses the WFD connection information transmitted/received between the mobile terminal 100 and the multifunction device 1 in the process of A1 to use the WFD connection with the mobile terminal 100. Communication is established (A2). After that, the CPU 51 controls the wireless network I/F 17 to measure the communication speed of WFD communication between the multifunction device 1 and the mobile terminal 100 (A3). For example, the CPU 51 measures the communication speed of the WFD communication in the direction from the multifunction machine 1 to the mobile terminal 100 by transmitting the test data to the mobile terminal 100 by the WFD communication. After that, the CPU 51 determines whether or not the threshold value stored in the memory 52 is an appropriate value according to the communication speed measured in A3 (A4). When it is determined that the threshold value is an appropriate value (A4: YES), the process proceeds to A6.

On the other hand, when determining that the threshold value is not an appropriate value (A4: NO), the CPU 51 corrects the threshold value stored in the memory 52 to an appropriate value according to the communication speed (A5). .. Specifically, when the communication speed measured in A3 is higher than the communication speed corresponding to the threshold value stored in the memory 52, the threshold value stored in the memory 52 is corrected to be increased. On the other hand, when the communication speed measured in A3 is slower than the communication speed corresponding to the threshold stored in the memory 52, the threshold stored in the memory 52 is corrected to be smaller. As a result, the threshold value stored in the memory 52 can be set to an appropriate value according to the measured communication speed. After this, the process moves to A6.

In the process of A6, the CPU 51 controls the wireless network I/F 17, receives image data from the mobile terminal 100 by WFD communication, and transmits/receives response data in response to the reception to the mobile terminal 100. To start. Further, at this time, the CPU 51 starts a monitoring process of monitoring the communication amount of the response signal during the transmission/reception process for a certain period. After that, the CPU 51 causes the display 13b to display a receiving screen indicating that image data is being received from the mobile terminal 100 (A7). Next, the CPU 51 determines whether or not the communication amount of the response signal monitored by the monitoring process for a certain period exceeds a threshold value (A8). When it is determined that the communication amount of the response signal for the certain period is less than the threshold value (A8: NO), the CPU 51 determines that there is no abnormality in the transmission/reception process, and proceeds to the process of A19.

On the other hand, when it is determined that the communication amount of the response signal for the certain period exceeds the threshold value (A8: YES), the CPU 51 determines that an abnormality has occurred in the transmission/reception process and controls the wireless network I/F 17. Then, the transmission/reception process is interrupted (A9). At this time, the receiving screen is kept displayed on the display 13b.

Next, the CPU 51 controls the wireless network I/F 17, transmits test data to the mobile terminal 100 by WFD communication, and sets the communication speed of the WFD communication in the direction from the multifunction machine 1 to the mobile terminal 100. Remeasure (A10). Then, the CPU 51 determines whether or not the re-measured communication speed is higher (faster) than the communication speed measured in the process of A3 (A11). When it is determined that the communication speed has not increased (A11: NO), the process proceeds to A14.

On the other hand, when it is determined that the communication speed is increasing (A11: YES), the CPU 51 corrects the threshold stored in the memory 52 to be increased according to the communication speed remeasured in the process of A10. (A12). Next, the CPU 51 determines whether or not the communication amount of the response signal used in the determination of the process of A8 for a certain period also exceeds the corrected threshold value (A13). When it is determined that the communication amount of the response signal for the certain period exceeds the threshold value after correction (A13: YES), the process proceeds to A14. On the other hand, when it is determined that the communication amount of the response signal for the certain period is below the corrected threshold value (A13: NO), it is erroneous to determine that the transmission/reception process is abnormal in the process of A9. Assuming that no abnormality has occurred in the transmission/reception process, the process proceeds to A18. In this way, by comparing the threshold value changed according to the current communication speed with the communication amount of the response signal for a certain period, it is possible to more accurately determine whether or not an abnormality has occurred in the transmission/reception processing. it can.

In the process of A14, the CPU 51 controls the wired network I/F 15 to transmit the abnormality candidate information related to the abnormality determined in the process of A9 to the server 90, and determines whether or not the abnormality determination in the process of A9 is correct. Is received from the server 90, the inquiry process is executed.

Then, in the inquiry process, when the determination result received from the server 90 is the result that the determination of abnormality in the process of A9 is correct (A15: YES), the CPU 51 causes abnormality in the transmission/reception process. Is determined to occur, the wireless network I/F 17 is controlled to continue the interruption of the transmission/reception process, and disconnect the WFD communication with the mobile terminal 100 (A16). At this time, the CPU 51 also causes the display 13b to display an interruption screen indicating that the reception of the image data from the mobile terminal 100 has been interrupted. After this, this processing is terminated.

On the other hand, in the processing of A15, when the determination result received from the server 90 in the inquiry processing is the result that the abnormality determination in the processing of A9 is incorrect (A15: NO), the CPU 51 causes the memory Assuming that the threshold stored in 52 is not appropriate, correction is performed to increase this threshold (A17). Specifically, the CPU 51 increases the threshold value stored in the memory 52 by the same value as the communication amount of the response signal used in the determination of the processing of A8 for a certain period, or by a predetermined value in consideration of measurement error or the like. Correct to the value. After this, the process proceeds to A18.

In the processing of A18, the CPU 51 determines that no abnormality has occurred in the transmission/reception processing, controls the wireless network I/F 17, restarts the interrupted transmission/reception processing, and shifts to the processing of A19.

In the process of A19, the CPU 51 determines whether or not the reception of the image data from the mobile terminal 100 is completed. Then, when it is determined that the reception of the image data from the mobile terminal 100 is not completed (A19: NO), the process returns to A8. On the other hand, when it is determined that the reception of the image data from the mobile terminal 100 is completed (A19: YES), the CPU 51 displays an end screen indicating that the reception of the image data from the mobile terminal 100 is completed on the display 13b. The image recording mechanism 11 is controlled to record an image on the recording medium according to the image data received from the portable terminal 100 (A20). When the processing of A19 ends, this processing ends.

Next, with reference to FIG. 4, a main data communication procedure between the mobile terminal 100 and the multifunction device 1 related to the image recording instruction will be described. In addition, "ALT" in FIG. 4 is a fragment indicating a branch process.

First, in the mobile terminal 100, the image data to be subjected to the image recording process is selected by the user from the image data stored in the memory 122 via the touch panel 101 (S1). After that, when NFC communication is established by the user bringing the mobile terminal 100 close to the multifunction device 1 (S2), the mobile terminal 100 transmits an image recording instruction to the multifunction device 1 by NFC communication (S3). Next, WFD communication is established between the mobile terminal 100 and the multifunction device 1 using the WFD connection information transmitted and received through NFC communication (S4). Next, in the established WFD communication, the mobile terminal 100 transmits the image data selected in the process of S1 to the multi function peripheral 1, and the multi function peripheral 1 transmits a response signal to the mobile terminal 100. The transmission/reception process for transmitting is started (S5).

Then, when the transmission of the image data from the mobile terminal 100 to the multifunction device 1 is completed without the multifunction device 1 determining that the transmission/reception process is abnormal, the image recording process of the image data is performed in the multifunction device 1. (S6). After that, the WFD communication between the mobile terminal 100 and the multi-function peripheral 1 is cut off (S7), and this processing ends.

On the other hand, if the multifunction peripheral 1 determines that an abnormality has occurred in the transmission/reception processing before the transmission of the image data from the mobile terminal 100 to the multifunction peripheral 1 is completed, the transmission/reception processing is interrupted (S8). .. After that, the WFD communication between the mobile terminal 100 and the multi-function peripheral 1 is disconnected (S9), and this processing ends.

As described above, according to the present embodiment, the multi-function device 1 can determine whether or not an abnormality has occurred in the transmission/reception processing based on the communication amount of the response signal for a certain period and the threshold value stored in the memory 52. it can. Further, when the multifunction peripheral 1 determines that an abnormality has occurred in the transmission/reception processing, the transmission/reception processing is interrupted, so that illegal data leakage from the multifunction peripheral 1 to the mobile terminal 100 can be prevented. You can

Further, according to the present embodiment, when the multi-function peripheral 1 determines that the transmission/reception processing is abnormal, the multi-function peripheral 1 makes an inquiry to the server 90 as to whether or not the determination is correct. In this way, the multi-function device 1 makes an inquiry to the server 90, thereby making it possible to more accurately determine whether or not an abnormality has occurred in the transmission/reception processing.

If the multifunction device 1 determines that the transmission/reception process is abnormal, the transmission/reception process is interrupted before making an inquiry to the server 90. It is possible to prevent data from leaking quickly.

In addition, even when the transmission/reception process is being executed even during the period in which the transmission/reception process is interrupted until the multifunction device 1 determines that the transmission/reception process is abnormal, until the determination result is received from the server 90. Similarly, the receiving screen is displayed on the display 13b. For this reason, it is possible to prevent the user from having an unnecessary concern when the transmission/reception process is not actually abnormal.

Next, a modified example of the operation of the multifunction machine 1 when receiving the image recording instruction from the mobile terminal 100 will be described with reference to FIG. In this modification, as shown in FIG. 5, the communication amount of the response signal during the transmission/reception process exceeds a threshold value (A8: YES), and the CPU 51 determines that an abnormality has occurred in the transmission/reception process. When (A50), the transmission/reception process is not interrupted. In the inquiry processing of A14, when the determination result received from the server 90 is the result that the determination of abnormality in the processing of A9 is correct (A15: YES), the CPU 51 controls the wireless network I/F 17. Then, the transmission/reception process is interrupted (A51).

As described above, in the present modification, it is possible to prevent the transmission/reception process from being unnecessarily interrupted even though no abnormality actually occurs in the transmission/reception process.

Next, an example of a process executed by the CPU 51 of the multi-function peripheral 1 when receiving an image reading instruction from the mobile terminal 100 according to a program recorded in the memory 52 will be described with reference to FIG.

First, when the mobile terminal 100 is brought close to the multifunction device 1, the CPU 51 controls the NFC I/F 16 to establish NFC communication with the mobile terminal 100 (B1). At this time, the multifunction device 1 receives the image reading instruction from the mobile terminal 100 by NFC communication. Next, the CPU 51 controls the image reading mechanism 12 to read the image recorded on the recording medium and generate image data related to the image (B2).

Next, the CPU 51 controls the wireless network I/F 17 to establish WFD communication with the mobile terminal 100 (B3). After that, the CPU 51 controls the wireless network I/F 17, receives the test data from the mobile terminal 100 by WFD communication, and measures the communication speed of WFD communication in the direction from the mobile terminal 100 to the multifunction device 1. (B4). After that, the CPU 51 determines whether or not the threshold value stored in the memory 52 is an appropriate value according to the communication speed measured in B4 (B5). When it is determined that the threshold value is an appropriate value (B5: YES), the process proceeds to B7. On the other hand, when it is determined that the threshold is not an appropriate value (B5: NO), the CPU 51 corrects the threshold stored in the memory 52 according to the measured communication speed (B6), and the process of B7. Move on to.

In the processing of B7, the CPU 51 controls the wireless network I/F 17 to transmit the image data generated in B2 to the mobile terminal 100 and receive the response data from the mobile terminal 100 by WFD communication. Start processing. Further, at this time, the CPU 51 starts a monitoring process of monitoring the communication amount of the response signal during the transmission/reception process for a certain period.

Hereinafter, the processes of B8 to B14 are substantially the same as the processes of A7 to A13 described with reference to FIG. 3 described above, except that the transmission directions of the image data and the response signal in the transmission/reception process are different. The description is omitted.

In the process of B12, when it is determined that the communication speed remeasured in the process of B11 is not higher than the communication speed measured in the process of B4 (B12: NO), or in the process of B14, B9 When it is determined that the communication amount of the response signal used in the determination of the processing of step B exceeds the threshold value after correction (B14: YES), the CPU 51 determines that the transmission/reception processing is abnormal in the processing of step B10. It is determined that the determination that it has occurred is correct (B16). Then, the CPU 51 controls the wireless network I/F 17, disconnects the WFD communication with the mobile terminal 100, and displays an interruption screen indicating that reception of image data from the mobile terminal 100 is interrupted on the display 13b. Is displayed on the screen (B17). After this, this processing is terminated.

Further, in the processing of B14, when it is determined that the communication amount of the response signal used in the determination of the processing of B9 for a certain period is below the corrected threshold value (B14: NO), the CPU 51 causes the processing of B10. Since it is erroneous to judge that the transmission/reception process has an abnormality, and the transmission/reception process has no abnormality, the wireless network I/F 17 is controlled to restart the interrupted transmission/reception process (B15). .. After this, the process proceeds to B18.

In the process of B18, the CPU 51 determines whether or not the transmission of the image data to the mobile terminal 100 is completed. When it is determined that the transmission of the image data to the mobile terminal 100 is not completed (B18: NO), the process returns to B9. On the other hand, when determining that the transmission of the image data to the mobile terminal 100 is finished (B18: YES), the CPU 51 displays on the display 13b an end screen indicating that the transmission of the image data to the mobile terminal 100 is finished. This is displayed (B19), and this processing ends.

Next, with reference to FIG. 7, a main data communication procedure between the mobile terminal 100 and the multi-function peripheral 1 related to the image reading instruction will be described.

When NFC communication is established by the user bringing the mobile terminal 100 close to the multifunction device 1 (C1), the mobile terminal 100 transmits an image reading instruction to the multifunction device 1 by NFC communication (C2). Next, the multi-function peripheral 1 reads the image recorded on the recording medium and executes an image reading process for generating image data related to the image (C3). After that, the WFD communication is established between the mobile terminal 100 and the multifunction device 1 by using the WFD connection information transmitted and received through the NFC communication (C4). Next, in this established WFD communication, a transmission/reception process in which the multifunction device 1 transmits the generated image data to the mobile terminal 100 and the mobile terminal 100 transmits a response signal to the multifunction device 1 is performed. It is started (C5).

Then, when the transmission of the image data from the multi-function peripheral 1 to the mobile terminal 100 ends without the multi-function peripheral 1 deciding that an abnormality has occurred in the transmission/reception processing, WFD communication between the mobile terminal 100 and the multi-function peripheral 1 is performed. Is disconnected (C6), and this processing ends.

On the other hand, if the multifunction peripheral 1 determines that an abnormality has occurred in the transmission/reception processing before the transmission of the image data from the multifunction peripheral 1 to the mobile terminal 100 ends, the transmission/reception processing is interrupted (C7). .. After that, the WFD communication between the mobile terminal 100 and the multi-function peripheral 1 is cut off (C8), and this processing ends.

As described above, also regarding the processing related to the image reading instruction, the multifunction device 1 determines whether or not an abnormality has occurred in the transmission/reception processing based on the communication amount of the response signal for a certain period and the threshold value stored in the memory 52. can do. Further, when the multifunction device 1 determines that the transmission/reception process has an abnormality, the transmission/reception process is interrupted, so that it is possible to prevent an unauthorized program from entering the multifunction device 1 from the mobile terminal 100. it can.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made as long as they are set forth in the claims. Therefore, the above-described embodiments may be combined or part of the configuration may be changed within the scope of the technical idea of the present invention. For example, in the operation of the multi-function peripheral 1 when receiving an image reading instruction from the mobile terminal 100, when the CPU 51 determines that an abnormality has occurred, the CPU 90 is configured to inquire the server 90 as to whether or not the determination is correct. May be. On the contrary, when the CPU 51 determines that an abnormality has occurred in the operation of the multifunction device 1 when receiving the image recording instruction from the portable terminal 100, the server 90 is configured not to inquire whether the determination is correct or not. May be.

Further, although the threshold value stored in the memory 52 is configured to be changed according to the communication speed of the WFD communication between the multifunction device 1 and the mobile terminal 100, it may be a fixed threshold value. Further, the threshold may be changed based on an instruction from an external device such as the server 90. Further, the threshold value stored in the memory 52 may be configured to be updated at any time in the transmission/reception process according to the communication speed of the WFD communication between the mobile terminal 100 and the multifunction device 1.

Further, in the above-described embodiment, the transmission and reception of the image data and the response signal between the multifunction device 1 and the mobile terminal 100 are performed via the WFD communication, but the present invention is not limited to this. Any wireless communication that does not go through a relay device may be used. Therefore, for example, the image data and the response signal may be transmitted and received between the multifunction device 1 and the mobile terminal 100 by the wireless communication in the ad hoc mode.

Further, even when the CPU 51 determines that an abnormality has occurred in the transmission/reception processing, the CPU 51 may be configured not to suspend the transmission/reception processing. Further, the data transmitted/received in the transmission/reception processing may be data other than image data. Further, the mobile terminal 100 may be configured to monitor the communication amount of the response signal in the WFD communication for a certain period and to perform the above determination in the transmission/reception processing. The image processing device and the communication device of the present invention can be applied to various devices other than the multifunction peripheral.

1 Multifunction device (image processing device, communication device)
11 Image recording mechanism (image recording unit)
12 Image reading mechanism (image reading unit)
14 Communication interface (communication section)
51 CPU (control unit)
52 Memory (storage unit)
100 mobile terminals

Claims (10)

An image processing apparatus capable of communicating with a mobile terminal,
A communication unit for performing wireless communication with the mobile terminal,
When image data is received from the mobile terminal by wireless communication without passing through a relay device, a threshold of the communication amount for a certain period of a response signal transmitted to the mobile terminal in response to the reception of the image data is stored. A storage unit for
An image recording unit for recording an image on a recording medium according to the image data received from the mobile terminal;
A control unit for controlling the communication unit,
The control unit is
A transmission/reception process of receiving image data from the mobile terminal by wireless communication without passing through the relay device, and transmitting the response signal to the mobile terminal in response to the reception.
During the transmission/reception process, a monitoring process of monitoring the communication amount of the response signal transmitted to the mobile terminal by wireless communication without passing through the relay device,
Judgment processing for judging that an abnormal processing is performed in the image processing apparatus and an abnormality occurs in the transmission/reception processing when the communication amount of the response signal monitored by the monitoring processing for a certain period exceeds the threshold value An image processing apparatus, characterized in that: An image processing apparatus capable of communicating with a mobile terminal,
A communication unit for performing wireless communication with the mobile terminal,
An image reading unit that reads an image recorded on a recording medium and generates image data related to the image;
When the image data generated by the image reading unit is transmitted to the mobile terminal by wireless communication without passing through a relay device, the communication amount of a response signal received from the mobile terminal in response to the transmission during a certain period. A storage unit for storing the threshold value of
A control unit for controlling the communication unit,
The control unit is
A transmission/reception process of transmitting image data to the mobile terminal by wireless communication not via the relay device, and receiving the response signal from the mobile terminal in response to the transmission,
A monitoring process of monitoring the communication amount of the response signal received from the mobile terminal by wireless communication without passing through the relay device during the transmission/reception process,
When the communication amount of the response signal monitored by the monitoring process for a certain period exceeds the threshold value, the mobile terminal performs an unauthorized process and determines that the transmission/reception process is abnormal. An image processing apparatus, which executes the following. The control unit is
The image processing apparatus according to claim 1, wherein the transmission/reception process is interrupted when it is determined in the determination process that an abnormality has occurred in the transmission/reception process. The communication unit is
When the database storing the abnormality information related to the abnormality that may occur in the transmission/reception processing and the abnormality candidate information related to the abnormality determined by the determination processing from the image processing device, the abnormality candidate information is stored in the database. A determination means for determining whether or not the determination by the determination processing is correct by determining whether or not any of the abnormality information is determined, and transmitting the determination result to the image processing apparatus. Can communicate with the device,
The control unit is
In the determination processing, when it is determined that an abnormality has occurred in the transmission/reception processing, the abnormality candidate information related to the determined abnormality is transmitted to the external device, and the determination result is received from the external device. The image processing apparatus according to claim 1, further comprising a process. The control unit is
In the inquiry process, when the determination result received from the external device is a result that the determination in the determination process is correct, the transmission/reception process is interrupted,
In the inquiry process, if the determination result received from the external device is a result that the determination in the determination process is incorrect, the transmission/reception process is continued. The image processing device described. The control unit is
From the time when it is determined that an abnormality has occurred in the transmission/reception processing by the determination processing, until the determination result is received in the inquiry processing, the transmission/reception processing is interrupted,
In the inquiry process, when the determination result received from the external device is a result that the determination in the determination process is correct, the interruption of the transmission/reception process is continued,
The transmission/reception process is restarted when the determination result received from the external device is a result that the determination in the determination process is incorrect in the inquiry process. The image processing device described. Further comprising an output device for outputting information to the user,
The control unit is
During the period during which the transmission/reception process is executed, and during the period from when the determination process determines that the transmission/reception process is abnormal to the time when the determination result is received in the inquiry process, the output device To output information indicating that image data is being sent and received, and
In the inquiry process, when the determination result received from the external device is a result that the determination in the determination process is correct, information indicating that transmission/reception of image data is interrupted is output to the output device. The image processing apparatus according to claim 6, further comprising: performing an output process that causes the image processing to be performed. The control unit is
Before the transmission/reception process,
A first communication speed measurement process for measuring a communication speed of wireless communication with the mobile terminal by transmitting and receiving test data to and from the mobile terminal,
8. A first threshold value changing process for changing the threshold value stored in the storage unit based on a measurement result of the first communication speed measuring process, is further executed. The image processing device according to 1. The control unit is
When it is determined by the determination processing that the transmission/reception processing has an abnormality, by transmitting/receiving test data to/from the mobile terminal, wireless communication with the mobile terminal not via the relay device is performed. A second communication speed measurement process for measuring the communication speed of
When the communication speed measured by the second communication speed measurement processing is higher than the communication speed measured by the first communication speed measurement processing, the storage unit stores the result in the storage unit based on the measurement result of the second communication speed measurement processing. A second threshold value changing process for increasing the stored threshold value;
It is determined that an abnormality has occurred in the transmission/reception processing by the determination processing when the communication amount of the response signal monitored by the monitoring processing for a certain period is less than the threshold changed by the second threshold changing processing. Is erroneous, and cancellation processing to determine that there is no abnormality in the transmission and reception processing,
The image processing apparatus according to claim 8, further comprising: A communication unit for performing wireless communication with the communication target device,
When data is transmitted from the transmission source to the reception source by wireless communication with the communication target device without passing through a relay device, the data is transmitted from the reception source to the transmission source in response to the transmission of the data. A storage unit for storing a threshold value of the communication amount of the response signal for a certain period,
A control unit for controlling the communication unit,
The control unit is
Data is transmitted from a transmission source to a reception source by wireless communication with the communication target device without passing through the relay device, and in response to the transmission of this data, the response signal is transmitted from the reception source to the transmission source. Send and receive processing,
During the transmission/reception process, a monitoring process of monitoring the communication amount of the response signal transmitted from the reception source to the transmission source by wireless communication without passing through the relay device,
Judgment processing for determining that the reception source has performed an unauthorized process and an abnormality has occurred in the transmission/reception processing when the communication amount of the response signal monitored by the monitoring processing for the certain period exceeds the threshold value. And a communication device for executing the following.