JP2008009746A - Sensor node and monitoring method by sensor node - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To monitor a monitor object in a reliable manner with a small-scale system and at low processing cost. <P>SOLUTION: A photographing part 11 of a sensor node 10 photographs a coverage around an own node. An object detecting part 12 detects whether a person to be detected, exists in the coverage of the photographing part 11. When the presence of the person is detected, a tag detecting part 13 detects whether a radio tag exists around the own node. When the presence of the radio tag is detected, a presence position determining part 14 determines whether the detected radio rag exists within the coverage of the photographing part 11. When it is determined that the radio tag does not exist within the coverage of the photographing part 11, a transmitting part 15 transmits a message to the effect that a person without a radio tag exists within the coverage, and an image photographed by the photographing part 11, to a client node. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a sensor node and a monitoring method using the sensor node.

Patent Document 1 below discloses a monitoring system for monitoring a target object. In this monitoring system, a suspicious person is monitored by image analysis of video data.
JP-A-9-224237

  However, generally, when a person is identified through image analysis, a large-scale system is required, and the processing cost is increased. In addition, in order to specify a person by image analysis, an extremely high processing capability is required, so that an inexpensive system with a low processing capability has a high probability of erroneous analysis.

  Accordingly, an object of the present invention is to provide a sensor node and a monitoring method using a sensor node that can reliably monitor a monitoring target with a small-scale system and low processing costs in order to solve the above-described problems. To do.

  The sensor node according to the present invention includes a photographing unit that photographs the surroundings of the node, a target detecting unit that detects the presence of a detection target within a range that can be photographed by the photographing unit, and a wireless tag that detects the presence of the wireless tag. Tag detecting means for measuring the radio field intensity, presence position determining means for determining whether or not the detected wireless tag is within a shootable range using the measured radio field intensity, and presence position determining means When it is determined that the detected wireless tag does not exist within the shootable range, a message indicating that the detection target without the wireless tag is within the shootable range and the shooting means Transmitting means for transmitting the recorded video to the outside.

  According to the monitoring method by the sensor node of the present invention, the sensor node shoots the surroundings of the own node, the object detection step of detecting the presence of the detection object within the shootable range in the shooting step, and the wireless tag A tag detection step for detecting the presence of a radio tag and measuring the radio field intensity of the radio tag, and using the measured radio field intensity, the presence of determining whether the detected radio tag is within a shootable range In the position determination step and the presence position determination step, if it is determined that the detected wireless tag does not exist within the shootable range, the detection target without the wireless tag exists within the shootable range. And a transmission step of transmitting the video imaged by the imaging means to the outside.

  According to these inventions, when a detection target enters into the shootable range, it can be determined whether or not the detection target has a wireless tag, and it is determined that the wireless tag is not held. In this case, a message indicating that a detection target that does not have a wireless tag has entered, and a video image taken when the detection target has entered can be transmitted to the outside. Thus, since the intruder can be identified by detecting the presence or absence of the wireless tag, the monitoring target can be reliably monitored with a small-scale system and inexpensive processing costs.

  The sensor node according to the present invention includes tag detection means for detecting the presence of a wireless tag and measuring the radio field intensity of the radio tag, and using the measured radio field intensity, the detected radio tag is within a range that can be photographed. Presence position determination means for determining whether or not it exists, and imaging means for photographing the surroundings of the own node when it is determined by the presence position determination means that the detected wireless tag is present within the imageable range And storage means for storing the video imaged by the imaging means in a memory in association with a tag identification ID that uniquely identifies the wireless tag detected by the tag detection means.

  In the monitoring method by the sensor node of the present invention, the sensor node is detected by using the tag detection step in which the presence of the wireless tag is detected and the radio field intensity of the radio tag is measured, and the measured radio field intensity. In the presence position determination step for determining whether or not the wireless tag is present within the shootable range, and the presence position determination step, when it is determined that the detected wireless tag is within the shootable range, A shooting step of shooting the surroundings of the own node, and a storage step of storing the video shot in the shooting step in a memory in association with a tag identification ID that uniquely identifies the wireless tag detected in the tag detection step; It is characterized by providing.

  According to these inventions, when a monitoring target possessing a wireless tag within the shootable range has entered, a tag of the wireless tag detected at the time of shooting is recorded when the monitoring target enters. It can be stored in the memory in correspondence with the identification ID. Thereby, it becomes possible to acquire the video to be monitored by designating the tag identification ID of the wireless tag. Therefore, it is possible to reliably monitor the monitoring target with a small system and an inexpensive processing cost.

  The sensor node of the present invention includes a receiving means for receiving a monitoring request message for requesting monitoring of a specific wireless tag from the outside, and a tag detecting means for detecting the presence of the wireless tag and measuring the radio wave intensity of the wireless tag. And the presence position determination means for determining whether or not the detected wireless tag is within the imageable range using the measured radio wave intensity, and the wireless tag detected by the tag detection means is uniquely identified. The ID tag determining means for determining whether or not the tag identification ID to be received is the same as the tag identification ID included in the monitoring request message received by the receiving means, and the detected wireless tag is detected by the presence position determining means. When it is determined that the image is within the image capturing range and the ID identification determination unit determines that both the tag identification IDs are the same, the area around the own node is imaged. That an imaging unit, an image photographed by the photographing means, characterized in that it comprises a transmitting means for transmitting to the transmission source of the monitoring request message.

  The sensor node monitoring method of the present invention includes a reception step in which the sensor node receives a monitoring request message requesting to monitor a specific wireless tag from the outside, and the presence of the wireless tag to detect the wireless tag. A tag detection step for measuring the radio field intensity, a presence position determination step for determining whether or not the detected radio tag is present within a shootable range, and a tag detection step using the measured radio field intensity ID identity determination step for determining whether or not the tag identification ID that uniquely identifies the detected wireless tag is the same as the tag identification ID included in the monitoring request message received in the reception step, and an existence position determination step In the above, it is determined that the detected wireless tag is within a range that can be photographed, and When it is determined that both tag identification IDs are the same, a photographing step for photographing the surroundings of the own node, and a transmission means for transmitting the video photographed in the photographing step to the transmission source of the monitoring request message; It is characterized by providing.

  According to these inventions, it is required to monitor a specific monitoring target from the outside, and when the specific monitoring target has entered the shooting possible range, the video of the monitoring target can be shot. The captured video can be transmitted to the outside requested to be monitored. As described above, since it is possible to provide an image of a monitoring target requested to be monitored from the outside by detecting the presence or absence of a specific wireless tag, the monitoring target is reliably monitored at a small system and at a low processing cost. be able to.

  According to the sensor node and the monitoring method using the sensor node according to the present invention, it is possible to reliably monitor the monitoring target with a small system and an inexpensive processing cost.

  Hereinafter, embodiments of a sensor node and a monitoring method using the sensor node according to the present invention will be described with reference to the drawings. In addition, in each figure, the same code | symbol is attached | subjected to the same element and the overlapping description is abbreviate | omitted.

[First embodiment]
First, a first embodiment of the present invention will be described. FIG. 1 is a diagram illustrating a configuration of a communication system 1 in the first embodiment. As shown in FIG. 1, the communication system 1 includes a sensor node 10 and a client node 20.

  The sensor node 10 forms a network with other sensor nodes 10 and exchanges messages with each other between the sensor nodes. The client node 20 requests various sensings from the sensor node 10 and receives the results. Various types of sensing include, for example, detecting the presence of a person who does not have the wireless tag 30, and monitoring a person who has the specific wireless tag 30.

  Next, the functional configuration of the sensor node 10 will be described with reference to FIG. As illustrated in FIG. 2, the sensor node 10 includes a photographing unit 11, a target detection unit 12, a tag detection unit 13, a presence position determination unit 14, and a transmission unit 15.

  The imaging unit 11 captures an image within the imageable range R around the node.

  The target detection unit 12 detects whether or not a detection target exists within the shootable range R of the shooting unit 11. In the present embodiment, the presence of a detection target is detected by determining the presence of a person from the video imaged by the imaging unit 11. Note that the method of detecting the presence of the detection target is not limited to this, and for example, the presence of a person may be detected using an infrared function.

  The tag detection unit 13 detects whether or not the wireless tag 30 exists around the node. The tag detection unit 13 measures the radio field intensity of the detected wireless tag 30.

  The presence position determination unit 14 determines whether or not the wireless tag 30 detected by the tag detection unit 13 exists within the shootable range R of the shooting unit 11. More specifically, the presence position determination unit 14 measures the distance to the wireless tag 30 using the radio wave intensity measured by the tag detection unit 13, and the measured distance is within the shootable range R. Judge whether it fits. Note that the determination method by the presence position determination unit 14 is not limited to this. For example, the distance from the wireless tag measured by another sensor node is collected and the position of the wireless tag 30 is estimated using three-point surveying or the like. Then, it may be determined whether or not the estimated position is within the imageable range R.

  When the presence position determination unit 14 determines that the wireless tag 30 does not exist within the shootable range R of the shooting unit 11, the transmission unit 15 detects that a person without the wireless tag 30 is within the shootable range R. Are transmitted to the client node 20, and a video image captured by the imaging unit 11.

  Next, the operation of the sensor node 10 in the first embodiment will be described with reference to FIG.

  First, the imaging unit 11 of the sensor node 10 captures an image of the imageable range R around the node (step S1).

  Next, the target detection unit 12 detects whether or not a person who is a detection target exists within the shootable range R of the shooting unit 11 (step S2). If no person is present (step S2; NO), the process proceeds to step S1 described above.

  On the other hand, when the presence of a person is detected in step S2 (step S2; YES), the tag detection unit 13 detects whether or not the wireless tag 30 exists in the vicinity of the own node (step S3). If the wireless tag 30 is not detected (step S3; NO), the process proceeds to step S5 described later.

  On the other hand, when the presence of the wireless tag 30 is detected in step S3 (step S3; YES), the presence position determination unit 14 determines whether the detected wireless tag 30 is within the shootable range R of the imaging unit 11. It is determined whether or not (step S4). If it is determined that the wireless tag 30 is present within the imageable range R of the imaging unit 11 (step S4; YES), the process proceeds to step S1 described above.

  On the other hand, when it is determined in step S4 that the wireless tag 30 does not exist within the shootable range R of the photographing unit 11 (step S4; NO), the transmission unit 15 photographs a person who is not attached with the wireless tag 30. The presence of a suspicious person is notified by transmitting to the client node 20 a message indicating that it exists within the possible range R and a video shot by the shooting unit 11 (step S5).

  According to the sensor node 10 in the present embodiment, when a person who is a detection target has entered the shootable range R around the own node, it is determined whether or not the person has the wireless tag 30. If it is determined that the wireless tag 30 is not possessed, a message indicating that a person who does not possess the wireless tag 30 has entered and a video imaged at the time of entry are transmitted to the client node 20. be able to. Thus, since the intruder can be specified by detecting the presence or absence of the wireless tag 30, the monitoring target can be reliably monitored with a small-scale system and an inexpensive processing cost.

[Second Embodiment]
Next, a second embodiment of the present invention will be described. The second embodiment is different from the first embodiment described above in that the functional configuration of the sensor node is partially different.

  The functional configuration of the sensor node 10A in the second embodiment will be described with reference to FIG. As illustrated in FIG. 4, the sensor node 10 </ b> A includes a tag detection unit 13, a presence position determination unit 14, a photographing unit 11, and a storage unit 16. As described above, the sensor node 10A of the second embodiment is further provided with the storage unit 16, and is different from the sensor node 10 of the first embodiment described above in that the target detection unit 12 and the transmission unit 15 are not provided. . Since the other configuration is the same as the functional configuration of the sensor node 10 in the first embodiment, the same reference numerals are given to the respective components and the description thereof will be omitted, and the differences from the first embodiment will be described below. The point will be described in detail.

  The storage unit 16 stores the video captured by the imaging unit 11 in the video database DB in association with a tag identification ID that uniquely identifies the wireless tag 30 detected by the tag detection unit 13.

  In the second embodiment, when the presence position determination unit 14 determines that the wireless tag 30 is present in the shootable range R, the shooting unit 11 shoots the shootable range R around the own node.

  Next, the operation of the sensor node 10A in the second embodiment will be described with reference to FIG.

  First, the tag detection unit 13 of the sensor node 10A detects whether or not the wireless tag 30 exists in the vicinity of the own node (step S11). When the wireless tag 30 is not detected (step S11; NO), the process of step S11 is repeated.

  On the other hand, when the presence of the wireless tag 30 is detected in step S11 (step S11; YES), the presence position determination unit 14 determines whether the detected wireless tag 30 is within the shootable range R of the imaging unit 11. It is determined whether or not (step S12). When it is determined that the wireless tag 30 does not exist within the shootable range R of the shooting unit 11 (step S12; NO), the process proceeds to step S11 described above.

  On the other hand, when it is determined in step S12 that the wireless tag 30 exists within the shootable range R of the shooter 11 (step S12; YES), the shooter 11 moves within the shootable range R around the node. A picture is taken (step S13).

  Next, the storage unit 16 stores the video captured by the imaging unit 11 in the video database DB in association with the tag identification ID of the wireless tag 30 detected by the tag detection unit 13. The captured video at the time of detection is stored (step S14). Thereafter, the process proceeds to step S11 described above.

  According to the sensor node 10A in the present embodiment, when a person who has the wireless tag 30 intrudes within the shootable range R around the own node, an image captured when the person has invaded is displayed. The video database DB can store the tag identification ID of the wireless tag 30 detected at the time of shooting. Thus, by specifying the tag identification ID of the wireless tag 30, it is possible to acquire an image of a person to be monitored. Therefore, it is possible to reliably monitor the monitoring target with a small system and an inexpensive processing cost.

  Note that the video stored in the video database DB includes, for example, a message requesting to provide a specific video to be monitored from the client node 20 or another sensor node 10A. A video corresponding to the included tag identification ID is extracted from the video database DB and transmitted to the client node 20 or another sensor node 10A.

[Third embodiment]
Next, a third embodiment of the present invention will be described. The third embodiment is different from the first embodiment described above in that a part of the functional configuration of the sensor node is different.

  The functional configuration of the sensor node 10B in the third embodiment will be described with reference to FIG. As illustrated in FIG. 6, the sensor node 10B includes a reception unit 17, a tag detection unit 13, a presence position determination unit 14, an ID identity determination unit 18, a photographing unit 11, and a transmission unit 15B. As described above, the sensor node 10B of the third embodiment further includes the receiving unit 17 and the ID identity determination unit 18, and the sensor node 10B of the first embodiment described above is not provided with the target detection unit 12. Is different. Since the other configuration is the same as the functional configuration of the sensor node 10 in the first embodiment, the same reference numerals are given to the respective components and the description thereof will be omitted, and the differences from the first embodiment will be described below. The point will be described in detail.

  The receiving unit 17 receives from the client node 20 a monitoring request message that requests to monitor a specific wireless tag. This monitoring request message includes a tag identification ID that uniquely identifies the wireless tag 30 to be monitored.

  The ID identity determination unit 18 determines whether or not the tag identification ID that uniquely identifies the wireless tag 30 detected by the tag detection unit 13 is the same as the tag identification ID included in the monitoring request message received by the reception unit 17. Determine whether.

  The imaging unit 11 according to the third embodiment is a tag of the wireless tag 30 that is determined by the presence position determination unit 14 and detected by the tag detection unit 13 that the wireless tag 30 exists within the shootable range R of the imaging unit 11. When the ID identification determination unit 18 determines that the identification ID and the tag identification ID included in the monitoring request message received by the reception unit 17 are the same, the periphery of the own node is photographed.

  The transmission unit 15B in the third embodiment transmits the video imaged by the imaging unit 11 to the client node 20 that is the transmission source of the monitoring request message.

  Next, the operation of the sensor node 10B in the third embodiment will be described with reference to FIG.

  First, the receiving unit 17 of the sensor node 10B receives a monitoring request message for requesting monitoring of a specific wireless tag from the client node 20 (step S21).

  Next, the tag detection unit 13 detects whether or not the wireless tag 30 exists around the node (step S22). If the wireless tag 30 is not detected (step S22; NO), the process proceeds to step S27 described later.

  On the other hand, when the presence of the wireless tag 30 is detected in step S22 (step S22; YES), the presence position determination unit 14 determines whether the detected wireless tag 30 exists within the shootable range R of the imaging unit 11. It is determined whether or not (step S23). If it is determined that the wireless tag 30 does not exist within the shootable range R of the photographing unit 11 (step S23; NO), the process proceeds to step S27 described later.

  On the other hand, if it is determined in step S23 that the wireless tag 30 is present within the shootable range R of the imaging unit 11 (step S23; YES), the ID identity determination unit 18 detects the wireless tag detected by the tag detection unit 13. By determining whether or not the tag identification ID of 30 is the same as the tag identification ID included in the monitoring request message received by the receiving unit 17, the detected wireless tag 30 is the wireless tag 30 to be monitored. It is determined whether or not there is (step S24). When it is determined that the detected wireless tag 30 is not the wireless tag 30 to be monitored (step S24; NO), the process proceeds to step S27 described later.

  On the other hand, when it is determined that the wireless tag 30 detected in step S24 is the wireless tag 30 to be monitored (step S24; YES), the photographing unit 11 photographs the surroundings of the own node (step S25).

  Next, the transmission unit 15B transmits the video imaged by the imaging unit 11 to the client node 20 that is the transmission source of the monitoring request message (step S26).

  Next, when the monitoring request by the monitoring request message is continued (step S27; YES), the process proceeds to the above-described step S21, and when the monitoring request by the monitoring request message is completed (step S27; YES), the monitoring process is terminated.

  According to the sensor node 10B in the present embodiment, when a specific wireless tag is requested to be monitored from the client node 20, and this specific wireless tag enters the image-capturing range R, the wireless node possesses this wireless tag. An image of a person can be captured, and the captured image can be transmitted to the client node 20 that requested to monitor. In this way, by detecting the presence / absence of a specific wireless tag, it is possible to provide a video of a person requested to be monitored from the client node 20, thereby reliably monitoring a small system with a low processing cost. The subject can be monitored.

It is a figure which illustrates the system configuration | structure of the communication system in embodiment of invention. It is a block diagram which illustrates the functional composition of the sensor node in a 1st embodiment. It is a flowchart which illustrates operation | movement of the sensor node in 1st Embodiment. It is a block diagram which illustrates the functional composition of the sensor node in a 2nd embodiment. It is a flowchart which illustrates operation | movement of the sensor node in 2nd Embodiment. It is a block diagram which illustrates the functional composition of the sensor node in a 3rd embodiment. It is a flowchart which illustrates operation | movement of the sensor node in 3rd Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Communication system 10, 10A, 10B ... Sensor node, 11 ... Image pick-up part, 12 ... Object detection part, 13 ... Tag detection part, 14 ... Existence position determination part, DESCRIPTION OF SYMBOLS 15 ... Transmission part, 16 ... Memory | storage part, 17 ... Reception part, 18 ... ID identity determination part, 20 ... Client node, 30 ... Wireless tag.

Claims (6)

Photographing means for photographing the surroundings of the own node;
Target detection means for detecting the presence of a detection target within a range that can be shot by the shooting means;
Tag detection means for detecting the presence of a wireless tag and measuring the radio field intensity of the wireless tag;
Presence position determining means for determining whether or not the detected wireless tag is within the imageable range using the measured radio field intensity;
When the presence position determination means determines that the detected wireless tag does not exist within the shootable range, a detection target without a wireless tag is present within the shootable range. And a transmission means for transmitting the image photographed by the photographing means to the outside,
A sensor node comprising: Tag detection means for detecting the presence of a wireless tag and measuring the radio field intensity of the wireless tag;
Presence position determining means for determining whether or not the detected wireless tag is within the imageable range using the measured radio field intensity;
When the presence position determination unit determines that the detected wireless tag is present within the imageable range, an imaging unit that captures the surroundings of the own node;
Storage means for storing the video imaged by the imaging means in a memory in association with a tag identification ID that uniquely identifies the wireless tag detected by the tag detection means;
A sensor node comprising: Receiving means for receiving a monitoring request message for requesting to monitor a specific wireless tag from the outside;
Tag detection means for detecting the presence of a wireless tag and measuring the radio field intensity of the wireless tag;
Presence position determining means for determining whether or not the detected wireless tag is within the imageable range using the measured radio field intensity;
The same ID that determines whether or not the tag identification ID that uniquely identifies the wireless tag detected by the tag detection means is the same as the tag identification ID included in the monitoring request message received by the reception means A determination means;
When it is determined by the presence position determination means that the detected wireless tag is within the imageable range, and when the ID identification determination means determines that the two tag identification IDs are the same. Photographing means for photographing the surroundings of the own node;
Transmitting means for transmitting the video imaged by the imaging means to a transmission source of the monitoring request message;
A sensor node comprising: The sensor node
A shooting step for shooting around the node;
A target detection step for detecting the presence of a detection target within a range capable of being shot in the shooting step;
A tag detection step of detecting the presence of the wireless tag and measuring the radio field intensity of the wireless tag;
A presence position determination step of determining whether or not the detected wireless tag is within the imageable range using the measured radio field intensity;
In the presence position determining step, if it is determined that the detected wireless tag does not exist within the shootable range, a detection target without a wireless tag is present within the shootable range. And a transmission step of transmitting the image photographed by the photographing means to the outside,
A monitoring method using a sensor node. The sensor node
A tag detection step of detecting the presence of the wireless tag and measuring the radio field intensity of the wireless tag;
A presence position determination step of determining whether or not the detected wireless tag is within the imageable range using the measured radio field intensity;
In the presence position determination step, when it is determined that the detected wireless tag is within the imageable range, a shooting step of shooting the surroundings of the own node;
A storage step of storing the video imaged in the imaging step in a memory in association with a tag identification ID that uniquely identifies the wireless tag detected in the tag detection step;
A monitoring method using a sensor node. The sensor node
A reception step of receiving a monitoring request message requesting to monitor a specific wireless tag from the outside;
A tag detection step of detecting the presence of the wireless tag and measuring the radio field intensity of the wireless tag;
A presence position determination step of determining whether or not the detected wireless tag is within the imageable range using the measured radio field intensity;
The same ID that determines whether or not the tag identification ID that uniquely identifies the wireless tag detected in the tag detection step is the same as the tag identification ID included in the monitoring request message received in the reception step A determination step;
When it is determined in the presence position determination step that the detected wireless tag is within the imageable range, and in the ID identity determination step, it is determined that the tag identification IDs are the same. , A shooting step for shooting around the own node,
Transmitting means for transmitting the video imaged in the imaging step to a transmission source of the monitoring request message;
A monitoring method using a sensor node.

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