JP6453554B2 - Wireless communication system - Google Patents

Description

  The present invention relates to a wireless communication system.

As a means of protecting the lives and assets of local residents from disasters such as typhoons, floods, and earthquakes, the introduction of regional disaster prevention radio systems, etc. is being promoted. It is operated to conduct evacuation guidance.
As information transmission in a conventional disaster prevention system, for example, there is a municipal disaster prevention radio broadcast system. In this municipal disaster prevention radio broadcast system, emergency information etc. is transmitted from the master station to a slave station (outdoor loudspeaker station) installed outdoors and a separate receiver installed in the house. The outdoor loudspeaker station that has received the emergency information or the like transmits the emergency information or the like to the local residents in a batch by voice notification using a loudspeaker, and the door-to-door receiver that receives the emergency information or the like receives the door-to-door reception. Emergency information etc. are output to the display unit and voice output unit of the machine.

  On the other hand, in recent years, the advancement of camera face recognition systems has progressed. The face recognition algorithm is identified by extracting features that stand out from the face image. For example, the relative position and size of facial parts, the shape of eyes, nose, cheekbones, and chin are used as features. Such characteristics are used to determine whether or not a person is present.

  As prior art documents, JP2003-308581A (Patent Document 1) and the like can be cited.

JP 2003-308581 A

As described above, the conventional disaster prevention system needs to transmit a broadcast instruction from the master station when broadcasting emergency information such as an evacuation instruction from the slave station. Therefore, when re-broadcasting emergency information such as an evacuation instruction from the slave station, there is a problem that the broadcast instruction must be transmitted again from the master station.
In view of the above problems, an object of the present invention is to provide a wireless communication system including a camera-equipped slave station, in which the slave station determines the presence or absence of a person from a captured image of the camera and performs rebroadcast from the slave station. .

  The radio communication system according to the present invention is a radio communication system including a master station and at least one slave station, wherein the slave station receives a broadcast data transmitted from the master station, and receives from the radio unit A broadcast unit that broadcasts based on the broadcast data, a memory unit that holds the broadcast data, a camera unit that captures a predetermined area, and a determination unit that determines the presence or absence of a person from a captured image captured by the camera unit The broadcast unit is a wireless communication system that performs rebroadcast based on the broadcast data when the determination unit determines that there is a person.

  Further, in the above wireless communication system, the master station transmits camera link report information to the slave station, and the slave station receives the camera link report information from the master station at the radio unit, It is desirable that the determination unit determine the presence or absence of a person from the captured image of the camera unit.

  In the above wireless communication system, it is preferable that the slave station notifies the master station by the wireless unit when the determination unit determines that there is a person from the captured image of the camera unit.

  Further, in the above wireless communication system, the slave station holds the captured image of the camera unit in the memory unit, and when the determination unit determines that there is a person from the captured image of the camera unit, the wireless unit It is desirable to transmit the captured image of the camera unit to the master station.

  Further, in the above wireless communication system, the slave station holds the captured image of the camera unit in the memory unit, and every time a predetermined time elapses from when the broadcast data transmitted from the master station is received. In addition, it is preferable that the radio unit transmits a captured image of the camera unit to the master station.

  In the wireless communication system, the slave station includes a timer that starts counting when the broadcasting unit broadcasts, a first timer value, and a second timer value. In the process of broadcasting, when the count time of the timer unit is less than the first timer value, the broadcast unit does not perform rebroadcast, the determination unit does not determine that there is a person, and the timer When the count time of the section is equal to or greater than the second timer value, it is desirable to end the process of performing the rebroadcast.

  According to the present invention, re-broadcasting from the broadcasting unit can be performed by detecting the presence or absence of a person from the camera image by the slave station.

It is a block diagram which shows the structure of the radio | wireless communications system based on one Example of this invention. 6 is a flowchart for explaining an operation of the wireless communication system according to the embodiment of the present invention. It is the schematic for demonstrating operation | movement of the radio | wireless communications system which concerns on another one Example of this invention. 7 is a flowchart for explaining an operation of a radio communication system according to another embodiment of the present invention.

Example 1
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a block diagram showing a configuration of a wireless communication system according to an embodiment of the present invention.
The wireless communication system according to the present invention includes a master station 100 and a plurality of slave stations 120. In this example, the configuration of the master station 100 and one slave station 120 will be described.
The operation is the same even when there are a plurality of slave stations 120.

The master station 100 includes an operation console 101, a monitor unit 102, a map display unit 103, a control unit 104, a radio unit 105, and an antenna 106.
The operator can broadcast the voice input from the loudspeaker 126 or the loudspeaker 126 by controlling the slave station 120 or inputting the voice from the microphone (not shown) to the slave station 120 on the console 101.

The control unit 104 transmits broadcast data such as a control signal and an audio signal from the wireless unit 105 to the slave station 120 via the antenna 106 in accordance with an instruction input from the console 101.
In addition, the control unit 104 displays the contents of instructions and the like input from the console 101 and information transmitted from the slave station 120 on the monitor unit 102 or the map display unit 103.

The slave station 120 includes an antenna 121, a radio unit 122, a control unit 123, an operation unit 128, a loudspeaker 126 such as a trumpet speaker that is controlled by the control unit 123 and outputs a sound, and a camera that captures a predetermined area. Part 127.
The camera unit 127 may have a turning function such as a pan head. Further, the camera unit 127 may be capable of photographing all directions of 360 ° or may be an infrared camera capable of detecting heat.

In this embodiment, the determination unit 124 and the memory unit 125 are built in the control unit 123.
The determination unit 124 detects the presence or absence of a person based on the image captured by the camera unit 127. Specifically, the presence / absence of a person is determined by detecting a person by image processing or by detecting a moving body such as a vehicle driven by a person.
Note that the determination unit 124 may be disposed anywhere in the slave station 120, and may be incorporated in the camera unit 127, for example.

The memory unit 125 primarily stores broadcast audio data and image data captured by the camera unit 127.
The control unit 123 and the loudspeaker 126 function as a broadcasting unit that performs broadcasting based on broadcast data received by the wireless unit 122 from the master station 100.

  The operation unit 128 enables the slave station 120 to be used alone, and includes a microphone or the like (not shown). The operation content of the operation unit 128 may be transmitted to the master station 100.

Downlink 141 wirelessly transmits broadcast data such as control signals and audio signals from master station 100 to slave station 120.
The uplink 142 wirelessly transmits slave station information such as image data and an operation confirmation signal (answerback) taken by the camera unit 127 from the slave station 120 to the master station 100.

The master station 100 transmits “camera linked notification information” to the slave station 120 in an emergency such as a disaster.
The “camera linked notification information” is control information for causing the slave station 120 to perform rebroadcast based on the determination of the presence or absence of a person. This “camera-linked notification information” may be a single command (for example, a flag), information indicating a broadcast type on the system, or whether an image captured by the camera unit 127 described later is transmitted. It may be information including a plurality of commands including a command indicating whether or not. In this embodiment, when the slave station 120 receives this “camera link notification information”, the camera unit 127 and the broadcast unit are linked together, the presence or absence of a person is determined from the image data captured by the camera unit 127, and the broadcast unit Rebroadcast is performed based on the determination result.

Next, the operation of the wireless communication system according to the embodiment of the present invention will be described using the flowchart of FIG.
The slave station 120 receives “camera link notification information” from the master station 100 by the wireless unit 122 (S201), and proceeds to the process of S202. If the received broadcast data does not include “camera linked notification information”, the slave station 120 performs broadcast (report) based on the received broadcast data as usual, and ends the process.

In the process of S202, the control unit 123 causes the loudspeaker 126 to perform broadcast (report) based on the broadcast data received by the wireless unit 122. In addition, when the “camera link notification information” is received, the control unit 123 stores the received broadcast data in the memory unit 125. When “camera link notification information” is detected, the determination unit 124 starts the determination process of the presence / absence of a person from the image data captured by the camera unit 127, and proceeds to the process of S203. If the determination unit 124 determines that there is a person, the determination unit 124 notifies the control unit 123 that it has been determined that there is a person by, for example, a method of outputting an activation contact.
In the process of S203, counting is started by a built-in timer (not shown) after the end of broadcasting (reporting).

In the process of S204, the control unit 128 compares the count time with the repeat timer value. If the count time is less than the repeat timer value (NO route of S204), the process returns to the process of S204, and the count time repeats the timer value. In the above case (YES route in S204), the process proceeds to S205.
The “repeat timer value” is a time until repeated broadcast (report), and if this is lengthened, the time until the next broadcast (report) is started is extended. If the evacuation does not take time, or if the urgency is high, the “repetition timer value” is set short.
The “repeat timer value” is set in advance, but a change instruction may be issued from the master station 100.
The “repetitive timer value” is set to, for example, 5 minutes when a tsunami warning is issued, and 10 minutes when a sediment disaster warning is issued.

  In the process of S205, if the determination unit 124 that has continuously performed the determination process of the presence of a person from the above S203 has notified the control unit 123 of the determination of the presence of a person (YES route of S205), the control The unit 123 reads the broadcast data stored in the process of S202 from the memory unit 125, and performs rebroadcast (report) by causing the loudspeaker 126 to perform broadcast (report) based on the broadcast data (S202). If the determination of the presence of a person has not been notified (NO route in S205), the process proceeds to S206.

  In the process of S206, the control unit 128 compares the count time with the person detection timer value, and if the count time is less than the person detection timer value (NO route of S206), the process returns to the process of S205, If it is equal to or greater than the detection timer value (YES route in S206), the rebroadcast (report) process is terminated.

The “person detection timer value” is a time at which the determination unit 124 ends the determination of the presence or absence of a person.
The “person detection timer value” is set in advance, but a change instruction may be issued from the master station 100.
As the “person detection timer value”, for example, 60 minutes is set when a tsunami warning is issued, and 180 minutes is set when a sediment disaster warning is issued.

  The “repeat timer value” and the “person detection timer value” may be instructed to be changed from the master station 100 as described above. For example, information on “repetition timer value” and “person detection timer value” may be transmitted from the master station 100 to the slave station 120 as broadcast data control information. In addition, the master station 100 transmits to the slave station 120 broadcast information (tsunami warning, earth and sand disaster warning, river flood warning, missile warning, weather information warning) and type information indicating the degree of urgency as broadcast data control information. The slave station 120 stores in advance a plurality of “repetition timer values” and “person detection timer values” corresponding to the broadcast contents and urgency, and based on the received control information, the “repetition timer value” and “person” The “detection timer value” may be changed.

  In the flowchart of FIG. 2, the rebroadcast (report) process termination condition is that the determination unit 124 does not notify the presence of a person and the count time of the timer unit is equal to or greater than the “person detection timer value”. In some cases, the rebroadcast (report) process of the slave station 120 may be terminated by a termination instruction from the master station 100. In this case, the master station 100 may directly transmit a termination instruction to the slave station 120. The master station 100 includes a mobile station that communicates with the master station 100, and the master station 100 that has received the instruction from the mobile station receives the slave station 120. It may be configured to send an end instruction to. Thereby, even the person who evacuated from the master station 100 can end the rebroadcast (report) processing of the slave station 120 by the mobile station.

  In addition to the first built-in timer, a second timer that counts from the first broadcast (report) and a timer value that terminates the rebroadcast (report) process are provided. When the count time becomes equal to or greater than the timer value for terminating the rebroadcast (report) process, the rebroadcast (report) process may be terminated regardless of the count time of the first built-in timer. As a result, it is possible to prevent the situation in which it is determined in step S205 that there is a person and the rebroadcast (report) process does not end.

  Further, when the determination unit 124 determines that there is a person, the slave station 120 may notify the master station 100 via the uplink 142 by the wireless unit 122. In this case, the image data captured by the camera unit 127 may be transmitted to the master station 100 via the uplink 142 by the wireless unit 122. Note that the image data may be a moving image or a still image. For example, the image data is transmitted when the determination unit 124 determines that there is a person, or every time a predetermined time elapses from broadcasting (reporting) by the broadcasting unit. To do. At this time, it is desirable that the master station 100 receives the image data transmitted from the slave station 120 and displays it on the monitor unit 102.

  Further, the master station 100 may display the position of the slave station 120 that has transmitted the image data to the map display unit 103 and the shooting range of the camera unit 127, and the position of the slave station 120 that has transmitted the image data is It is desirable to display it prominently by blinking.

  As described above, in the radio communication system according to the first embodiment, the slave station 120 receives the broadcast data transmitted from the master station 100, and broadcasts based on the broadcast data received from the radio unit 122. A broadcasting unit that performs broadcasting, a memory unit 125 that stores broadcasting data, a camera unit 127 that captures a predetermined area, and a determination unit that determines the presence or absence of a person from a captured image captured by the camera unit 127. Is characterized in that if the determination unit 124 determines that there is a person, rebroadcasting is performed based on the broadcast data. Thereby, it is possible to perform rebroadcast focusing on a place where a person exists without control from the master station 100. For example, if a tsunami evacuation broadcast instruction is given once from the master station 100 to the slave station 120, then the slave station 120 will voluntarily determine that there is a person nearby and perform a refuge rebroadcast. Therefore, the person in the master station 100 can evacuate from the tsunami immediately. In addition, rebroadcasting can be efficiently performed as necessary without repeating rebroadcasting meaninglessly even when no person is present.

  In the wireless communication system according to the first embodiment, the master station 100 transmits “camera linked report information” to the slave station 120, and the slave station 120 sends “camera linked report information” from the master station 100 to the wireless unit 122. When the image is received by the camera unit 127, the determination unit 124 determines the presence or absence of a person from the captured image of the camera unit 127. Accordingly, it is possible to determine whether or not there is a person in the slave station 120 as necessary, and it is possible to suppress the power consumption in the slave station 120 and the compression of the capacity of the memory unit 125.

  In the wireless communication system according to the first embodiment, the slave station 120 is characterized in that the wireless unit 122 notifies the master station 100 when the determination unit 124 determines that there is a person from the captured image of the camera unit 127. Yes. Thereby, since it is possible to check which child station 120 has determined that there is a person from the parent station 100, it is possible to check which child station 120 is near the person who has not been evacuated.

  Further, in the wireless communication system according to the first embodiment, the slave station 120 holds the captured image of the camera unit 127 in the memory unit 125, and when the determination unit 124 determines that there is a person from the captured image of the camera unit 127, A feature is that the photographed image of the camera unit 127 is transmitted to the master station 100 by the unit 122. As a result, the image data that the camera unit 127 of the slave station 120 has photographed and the determination unit 124 determines that there is a person is sent to the master station 100, so the situation of the person who has not evacuated can be confirmed from the master station 100. Can do.

  In the wireless communication system according to the first embodiment, the slave station 120 holds the captured image of the camera unit 127 in the memory unit 125 and a predetermined time has elapsed since the broadcast data transmitted from the master station 100 was received. Each time, the radio unit 122 transmits the captured image of the camera unit 127 to the master station 100. As a result, the image data captured by the camera unit 127 of the slave station 120 is sequentially sent to the master station 100, so that the evacuation status of the predetermined area captured by the camera unit 127 of the slave station 120 is obtained from the master station 100. The following can be confirmed.

  In the wireless communication system according to the first embodiment, the slave station 120 includes a timer unit that starts counting when the broadcast unit broadcasts, a first timer value, and a second timer value. In the process of performing rebroadcasting, if the count time of the timer unit is less than the first timer value, the broadcasting unit does not perform rebroadcasting, the determination unit 124 does not determine that there is a person, and the timer unit If the count time is equal to or greater than the second timer value, the rebroadcasting process is terminated. As a result, the re-broadcast interval and the time for ending the re-broadcast process can be set for each slave station 120. Therefore, the re-broadcast process can be set according to the broadcast content, the installation environment of the slave station 120, and the like. It can be carried out.

(Example 2)
Next, a radio communication system according to another embodiment of the present invention will be described with reference to the schematic diagram of FIG.
The wireless communication system in FIG. 3 is a slave station, and includes an operation unit 128, a control unit 123, a loudspeaker 126, and a camera unit 127.
The determination unit 124 and the memory unit 125 are built in the control unit 123.
The determination unit 124 may be disposed anywhere, for example, may be built in the camera unit 127.
The operator 301 operates the operation unit 128 to broadcast disaster information and the like.

The memory unit 125 primarily stores broadcast audio data and image data captured by the camera unit 127.
The operation unit 128 enables the slave station 120 in FIG. 1 to be used alone, and includes a microphone or the like not shown. Note that the operation content of the operation unit 128 may be transmitted to the master station 100 (not shown).

The camera unit 127 may have a turning function such as a pan head. The camera unit 127 may be a camera capable of photographing all directions of 360 °, or may be an infrared camera capable of detecting heat.
The danger area 310 is a range where a tsunami reaches or where a landslide is likely to occur, and is set in advance.
The person 311 is in the danger area 310. The person 313 is outside the danger area 310.
The evacuation 312 indicates a case where the person 311 moves out of the service area from the danger area 310.

Next, the operation of the wireless communication system according to another embodiment of the present invention will be described with reference to the flowchart of FIG.
The control unit 123 receives an instruction that the operator 301 inputs “evacuation broadcast” from the operation unit 128 (S401), and proceeds to the process of S402.
In the process of S402, a voice command is detected from “evacuation broadcast”, (recorded) voice data of the detected voice command is read (reproduced) from the memory unit 125, evacuation broadcast (first time) is performed from the loudspeaker 126, and the process of S403 is performed. Proceed to

  In the process of S403, it is determined whether or not a predetermined time has elapsed after the end of the broadcast. If the predetermined time has not elapsed (NO route of S403), the process returns to S403 and the predetermined time has elapsed (S403). YES route), the process proceeds to S404.

In the process of S404, the image data of the danger area 310 photographed by the camera unit 127 is acquired, and the process proceeds to the process of S405.
In the process of S405, the determination unit 124 determines the presence / absence of a person using a known method from the image data captured by the camera unit 127, and the process proceeds to S406.

In the process of S406, if the determination unit 124 determines that there is a person (YES route in S406), the process proceeds to S407, and if it does not determine the presence of a person (NO route in S406), the process proceeds to S409. move on.
In the process of S407, the operator 301 operates the operation unit 128 to determine whether or not a “broadcast stop” instruction has been input. If a “broadcast stop” instruction has been input (YES route of S407), the process proceeds to S409. If the “Broadcast Stop” instruction has not been input (NO route in S407), the process proceeds to S408.

In the process of S408, the (recorded) voice data of the above voice command is read (reproduced) from the memory unit 125, evacuated (rebroadcast) from the loudspeaker 126, and the process returns to S404.
In the process of S409, the evacuation broadcast (rebroadcast) is stopped from the loudspeaker 126, and the process returns to the process of S404.

  The above evacuation instruction rebroadcast ends when the operator 301 sends an end instruction to the control unit 123 by the operation unit 128. Alternatively, the control unit 123 includes a timer and a timer value for ending the evacuation instruction rebroadcast, and if the count time of the timer becomes equal to or greater than the timer value for ending the evacuation instruction rebroadcast, Broadcasting may be terminated.

As described above, the wireless communication system according to the second embodiment determines the presence or absence of a person from image data captured by the camera unit after an evacuation instruction broadcast is performed for an area where a disaster has occurred or is predicted, Start and end evacuation instructions rebroadcast.
Also, after a predetermined time has passed since the evacuation instruction broadcast, the dangerous area is photographed with a camera. Then, image processing of the captured image data is performed to determine whether there are any remaining persons or intruders. If it is determined from the camera image that there is a person, the evacuation instruction is rebroadcast until it is not determined that there is a person.
Furthermore, when the location determined to have a person in the monitoring camera image can be limited, an evacuation instruction rebroadcast instruction limited to only the location determined to have a person can be performed.

  Although the present invention has been described in detail above, it is needless to say that the present invention is not limited to the radio communication system described here, and can be widely applied to radio communication systems other than those described above.

  100: master station, 101: console, 102: monitor unit, 103: map display unit, 104: control unit, 105, 122: radio unit, 106, 121: antenna, 120: slave station, 123: control unit, 124 : Determination unit, 125: memory unit, 126: loudspeaker, 127: camera unit, 128: operation unit, 301: operator, 310: danger area, 311 and 313: person.

Claims (6)

In a wireless communication system comprising a master station and at least one slave station,
The slave station is
A radio unit for receiving broadcast data transmitted from the master station;
A broadcast unit that broadcasts based on the broadcast data received from the wireless unit;
A memory unit for holding the broadcast data;
A camera unit for photographing a predetermined area;
A determination unit for determining the presence or absence of a person from a captured image captured by the camera unit;
With
The master station transmits camera link report information to the slave station,
When the wireless unit receives the camera link notification information from the master station, the slave station determines the presence or absence of a person from the captured image of the camera unit, and the determination unit determines that there is a person Then , the broadcast unit performs rebroadcast based on the broadcast data. The wireless communication system according to claim 1, wherein
The wireless communication system, wherein the slave station notifies the master station by the wireless unit when the determination unit determines that there is a person from the photographed image of the camera unit. The wireless communication system according to any one of claims 1 to 2 ,
The slave station holds an image captured by the camera unit in the memory unit, and when the determination unit determines that there is a person from the image captured by the camera unit, the radio unit captures the image captured by the camera unit by the parent unit. A radio communication system characterized by transmitting to a station. In the radio | wireless communications system of any one of Claims 1-3 ,
The slave station holds a captured image of the camera unit in the memory unit, and the radio unit performs the camera unit every time a predetermined time elapses from when the broadcast data transmitted from the parent station is received. A radio communication system characterized by transmitting the captured image to the master station. In the radio | wireless communications system of any one of Claims 1-4 ,
The slave station includes a timer that starts counting when the broadcasting unit broadcasts, a first timer value, and a second timer value;
In the process of performing the rebroadcast,
If the count time of the timer unit is less than the first timer value, the broadcast unit does not re-broadcast,
In the wireless communication system, the determination unit terminates the rebroadcasting process when there is no determination of the presence of a person and the count time of the timer unit is equal to or greater than the second timer value. A memory unit for holding broadcast data;
A broadcast unit that broadcasts based on the broadcast data;
A camera unit for photographing a predetermined area;
A determination unit for determining the presence or absence of a person from a captured image captured by the camera unit;
An operation unit for receiving an instruction to stop broadcasting;
With
The broadcast unit, when the determination section determines that there is a person, and, when the operating unit is not accepting an instruction to stop broadcasting, have rows rebroadcast based on the broadcast data, the determination unit An outdoor loudspeaker station characterized by stopping rebroadcasting based on the broadcast data when it is determined that there is no person or when the operation unit accepts a broadcast stop operation .

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