JP2013008298A - Security system - Google Patents

Abstract

A security system capable of accurately identifying whether or not a moving body that has entered a monitoring area set around an entry restriction area is a suspicious object is provided.
A security system includes a storage means for storing a position of an entrance of a monitoring area set in at least a part of the periphery of an entry restricted area, and a detecting means for detecting a position of a moving body existing in the monitoring area. 21, a position tracking unit 341 that tracks the position of each detected moving body, and a determination unit 343 that determines the moving body as a suspicious object based on tracking information of the moving body. A criterion for determining a moving body that has entered from the entrance of the monitoring area as a suspicious object is a stricter criterion than a criterion for determining a moving body that has entered from other than the entrance as a suspicious object.
[Selection] Figure 1

Description

  The present invention relates to a security system for monitoring a mobile body that has entered a monitoring area.

Conventionally, intruders such as intruders who have entered a preset monitoring area are detected using any of various sensors, and when an intruder is detected, an alarm is issued or an intrusion abnormality is monitored. Security systems that report to the center are used. In such a security system, the sensor detects an abnormality even when a user who has a legitimate authority to enter the monitoring area enters the monitoring area, so the user operates the security system every time the user enters the monitoring area. It is necessary to cancel intrusion monitoring. Such an operation is complicated for the user.
Therefore, in order to enhance the convenience of the user, even if the user has a wireless tag and the sensor detects an intruder in the monitoring area, the intruder can detect the wireless tag if the intruder is detected. A security system has been proposed that recognizes that it is an intrusion abnormality (see, for example, Patent Document 1).

JP 2005-182340 A

Generally, a security system monitors a space or boundary inside a building such as a house as a monitoring area, but a suspicious person enters the building by using the surrounding area of the building, for example, the garden of a detached house as a monitoring area. Before, it becomes possible to detect and report a suspicious person quickly.
However, there is a possibility that various persons who are neither users nor suspicious people enter the garden of the house, such as a deliverer who delivers a delivery item, a general visitor, and the like. Therefore, when the above security system is operated with the garden of the house as the monitoring area, the person who does not have the wireless tag that enters the garden is uniformly judged as an intruder, and enters the monitoring area of the delivery person etc. There was a risk that misinformation would occur frequently.

  Therefore, an object of the present invention is to provide a security system capable of accurately identifying whether or not a moving body that has entered a monitoring area set around an entry restriction area is a suspicious object.

As one aspect of the present invention, there is provided a security system for monitoring the intrusion of a suspicious object into a monitoring area set in at least a part of the periphery of an entry restricted area. The security system includes storage means for storing the position of the entrance of the monitoring area, detection means for detecting the position of the moving body existing in the monitoring area, position tracking means for tracking the position of each detected moving body, and moving body Determining means for determining the moving body as a suspicious object based on the tracking information of the information, and the determining means enters a determination criterion for determining the moving body that has entered from the entrance of the monitoring area as a suspicious object from other than the entrance. The criteria for determining the moving body as a suspicious object are stricter.
According to this configuration, a strict criterion is used for a mobile body that has entered from the entrance of the monitoring area so that it is less likely to be determined as a suspicious object than a mobile body that has entered from a place other than the entrance. The strict determination criteria are, for example, increasing the grace time until determining as a suspicious object, or increasing the moving distance for determining as a suspicious object. Therefore, it is possible to suppress false notifications by a non-malicious person such as a visitor who has entered from the entrance while eliminating an apparently unauthorized intrusion from outside the entrance.

  In addition, the determination unit determines a moving body that has entered from other than the entrance as a suspicious object, and the moving body that has entered from the entrance is regarded as a suspicious object when the subsequent tracking information for each moving body matches a specific action. It is preferable to determine.

  Furthermore, it is preferable that the determination unit measures the time staying in the monitoring area for each moving body that has entered from the entrance, and determines that the moving body staying over a predetermined time is a suspicious object.

  Further, the storage means stores the range of the entrance area including the area connecting the entrance of the monitoring area and the entrance of the entry restriction area in the monitoring area, and the determination means is provided for each mobile body that has entered from the entrance of the monitoring area. It is preferable to allow a stay within a predetermined time in the entrance area.

  Further, the storage means stores the boundary position between the monitoring area and the entry restricted area, and the determining means detects the moving object that has entered the entry restricted area from the entrance of the monitored area and moves the movable object to the suspicious object. Is preferably determined.

  The security system further includes identification information acquisition means for acquiring identification information of the moving body, and authority identification means for determining whether or not the moving body is a pre-registered permitter from the identification information. Preferably does not determine that the mobile body determined to be an authorized person is a suspicious object.

  Further, the identification information acquisition means is a tag reader that reads identification information from a wireless tag existing in the monitoring area, and the authority identification means exists in the monitoring area by comparing the identification information with registered information registered in advance. It is preferable to determine whether or not the mobile object is an authorized person.

  Further, the identification information acquisition means detects the orientation of the wireless tag existing in the monitoring area, and the authority identification means determines the position of the mobile body detected by the detection means and the orientation of the wireless tag detected by the identification information acquisition means. It is preferable that the mobile object and the wireless tag are associated with each other, and the mobile object associated with the wireless tag is determined as the authorized person.

  The security system according to the present invention has an effect that it is possible to accurately identify whether or not a moving body that has entered a monitoring area set around an entry restriction area is a suspicious object.

1 is an overall system configuration diagram of a security system according to one embodiment of the present invention. It is a figure which shows an example of the monitoring area set to the outer periphery of the building in which the security system which concerns on one Embodiment of this invention was installed. It is a schematic block diagram of an example of the sensor terminal which can be used in the security system which concerns on one Embodiment of this invention. It is a flowchart which shows the operation | movement of a person detection process performed by the sensor process part of a sensor terminal. It is a schematic block diagram of an example of the monitoring terminal which can be used in the security system which concerns on one Embodiment of this invention. It is the schematic which shows the example of tracking data. It is a flowchart which shows the operation | movement of a person tracking process performed by the monitoring process part of a monitoring terminal. It is a flowchart which shows the operation | movement of the process at the time of the entrance event generate | occur | produced performed by the determination means.

Hereinafter, a security system for detecting a suspicious object that has entered a region to be monitored and issuing an alarm according to an embodiment of the present invention will be described with reference to the drawings. This security system monitors the entrance of a suspicious object by dividing an area to be monitored into a first monitoring area with high security and a second monitoring area with lower security than the first monitoring area. In this security system, among mobile bodies that have entered the second monitoring area, mobile bodies that have entered from other than the entrance of the second monitoring area are determined as suspicious objects, and mobile bodies that have entered from the entrance of the second monitoring area are immediately detected. Temporarily permits entry into the second monitoring area without determining that the object is a suspicious object. As a result, the security system prevents illegal entry into the building and suppresses false reports of suspicious person detection.
In the present embodiment, a person who has entered the monitoring area is taken as an example of a moving object, and the security system determines whether the person who has entered the monitoring area is a suspicious person, that is, a suspicious object. Further, in the present embodiment, a building of a detached house corresponding to an entry restriction area that does not allow entry by an unspecified person is taken as an example of the first monitoring area, security is lower than that of the first monitoring area, and entry by an unspecified person is constant. A site around a building of a detached house that is allowed under the above restrictions will be described as an example of a second monitoring area (hereinafter, the second monitoring area is simply referred to as a monitoring area).

FIG. 1 is a diagram showing an overall system configuration of a security system 1 according to one embodiment. As shown in FIG. 1, the security system 1 is installed around a house, and has at least one sensor terminal 2 that monitors at least a part of a site that is a monitoring area, and each sensor terminal 2 through a communication line. It has a monitoring terminal 3 connected and installed outdoors, and an operation indicator 4 connected to the monitoring terminal 3 and installed in the house.
Further, the security system 1 includes a wireless tag 5 possessed by a specific person such as a user. The wireless tag 5 can wirelessly communicate with the sensor terminal 2. When the wireless tag 5 receives the question signal from the sensor terminal 2, the wireless tag 5 returns an identification code (hereinafter referred to as a tag identification code) stored in the built-in memory.

  The sensor terminal 2 detects a person who has entered the monitoring area, detects the wireless tag 5, and notifies the monitoring terminal 3 of the detection result. Based on the detection result from the sensor terminal 2, the monitoring terminal 3 determines whether or not the person who has entered the monitoring area is a suspicious person. If the monitoring terminal 3 determines that the person who entered the monitoring area is a suspicious person, the monitoring terminal 3 issues an abnormality report indicating that the suspicious person has been detected to the monitoring center apparatus 6 connected via the public communication line. .

  The operation display 4 has a touch panel display and displays operation buttons for the user to input operation commands. When the user presses one of the operation buttons, a predetermined operation signal assigned to the operation button is output to the monitoring terminal 3. Further, the operation indicator 4 may selectively receive an image captured by the camera of any one of the sensor terminals 2 from the monitoring terminal 3 and display it according to an operation by the operation button.

  The wireless tag 5 stores a tag identification code assigned to each user such as a resident of a building where the security system 1 is installed, and is carried by each user. The tag identification code may be a code common to all users. When the wireless tag 5 has a built-in battery and receives an interrogation signal from the sensor terminal 2, it transmits a response signal including a tag identification code. The sensor terminal 2 identifies a user such as a resident of a building and a person other than that by a tag identification code. In the present embodiment, a person possessing the wireless tag 5 is referred to as an authorized person. On the other hand, a person who does not have the wireless tag 5 is called a non-permitted person. The wireless tag 5 may be a so-called active tag that actively transmits a signal including a tag identification code to the sensor terminal 2 periodically or at a predetermined timing.

  FIG. 2 is a diagram illustrating an example of a monitoring area set on the outer periphery of a building where the security system 1 is installed. The monitoring area is set in at least a part of the periphery of the detached house building. In this example, the monitoring area 200 is set on the entire site in contact with a part of the outer periphery of the building 210. The monitoring area 200 is divided into a plurality of partial areas. For example, an entrance area 201 that is an area connecting an entrance to the monitoring area 200 (site entrance 220) corresponding to a building site and an entrance 230 to the building 210, and an entrance area 201 It is divided into two types of regular monitoring areas 202 which are areas other than the above. And the sensor terminal 2 is each installed in the outer periphery of the building 210 so that the whole monitoring area 200 can be monitored. The monitoring terminal 3 is also installed on the outer periphery of the building 210, and the operation indicator 4 is installed inside the building 210. The site entrance 220 corresponds to a gate or a gate that serves as an entrance to the monitoring area 200, but when there is no physical entrance restriction such as a fence at the site boundary, a normal user or a visitor enters the site. It becomes a general entrance that passes. The entrance 230 to the building 210 corresponds to, for example, a front door of the building.

  The entrance area 201 is set in an area including a passage from the site entrance 220 to the entrance 230 of the building 210. Not only authorized persons but also non-permitted persons can enter the entrance area 201. That is, even if a non-permitted person is detected in the entrance area 201, it is not determined as a suspicious person by itself.

  The regular monitoring area 202 is an area where entry of persons other than the authorized person is prohibited. Therefore, when a non-permitted person enters the regular monitoring area 202, the security system 1 determines that the non-permitted person is a suspicious person in principle.

Further, the non-monitoring area on the outer periphery of the monitoring area 200 is an off-site area and is distinguished from the monitoring area 200. Furthermore, an area corresponding to the building 210 is an indoor area, and is distinguished from the monitoring area 200 and the off-site area. As a general rule, this indoor area is an area where only a permitter can enter, and a non-permitted person is determined to be a suspicious person. However, after an operation for permitting admission, for example, a monitoring release operation or an unlocking operation at the entrance, is performed by the monitoring terminal 3, even if a non-permitted person enters, it is not determined as a suspicious person.
In the example shown in FIG. 2, the monitoring area is set only in a part of the outer periphery of the building in the site, but the monitoring area may be set in the entire outer periphery of the building.

  FIG. 3 is a schematic configuration diagram of the sensor terminal 2. The sensor terminal 2 includes a sensor 21, a tag reader 22, a camera 23, a home communication unit 24, a speaker 25, a storage unit 26, and a sensor processing unit 27.

The sensor 21 is a human body detection sensor that periodically detects the position of a person existing in the monitoring area. For example, a laser distance measuring sensor can be used as the sensor 21. The laser ranging sensor projects a near-infrared pulse laser having a wavelength of, for example, about 870 nm in a predetermined angular step (for example, 0.25 ° unit) in a horizontal direction over a preset scanning range (for example, 180 °). Then, the reflected light of the laser is detected. Then, the laser distance measuring sensor measures the distance to the object reflecting the laser by, for example, the Time-of-Flight method. The sensor 21 scans the entire scanning range at a constant period (for example, 200 msec), measures the distance to the point where the laser is reflected in each direction within the scanning range, and uses the pulse laser to measure the measured distance. Ranging data associated with the projected direction is notified to the sensor processing unit 27.
Note that the sensor 21 may be configured to scan the laser two-dimensionally in the horizontal and vertical directions and obtain three-dimensional data including a scanning direction and a measurement distance. As for the distance measuring method, various known methods may be employed. For example, a phase difference method, a triangulation method, or the like can be used.

The tag reader 22 is an example of a human body identification sensor that acquires information for identifying a person who has entered the monitoring area.
The tag reader 22 communicates with the wireless tag 5 at a frequency of 900 MHz band or 2.4 GHz band, for example. The tag reader 22 includes an antenna having directivity in the signal transmission direction. As an antenna of the tag reader 22, for example, an adaptive array antenna that includes a plurality of small antennas and controls the traveling direction of the composite wave by adjusting the phase of the radio wave transmitted from each antenna can be used. The tag reader 22 sends out a question signal in a predetermined angular step (for example, in units of 5 °) in the horizontal direction over a preset detection range (for example, 180 °). When the tag reader 22 receives the response signal from the wireless tag 5 that responds to the question signal, the tag reader 22 analyzes the response signal and extracts a tag identification code included in the response signal. Then, the tag reader 22 notifies the sensor processing unit 27 of tag data in which the extracted tag identification code is associated with the direction in which the question signal is transmitted. The tag reader 22 scans the entire detection range at a constant cycle (for example, 200 msec), and notifies the sensor processing unit 27 of tag data at each cycle.
The tag reader 22 may include an antenna having directivity in the signal reception direction, or may include an antenna having directivity in both the transmission and reception directions. Further, the position of the wireless tag 5 can be specified by arranging three tag readers 22 and using a three-point surveying method.

  In the present embodiment, the detection range of the tag reader 22 is substantially the same as the monitoring area included in the scanning range of the sensor 21 of the same sensor terminal 2, and the azimuth and measurement in the tag data with respect to an arbitrary position in the monitoring area. It is assumed that the tag reader 22 and the sensor 21 are installed so that the directions in the distance data are the same.

  The camera 23 captures a predetermined area in the monitoring area at a predetermined cycle (for example, 200 msec), and generates an image of the predetermined area. The camera 23 passes the generated image to the sensor processing unit 27. The predetermined area is set so that, for example, a monitoring area included in the scanning range of the sensor 21 of the same sensor terminal 2 can be photographed. For example, in the example of FIG. 2, the camera 23 of each sensor terminal 2 has a field angle of about 180 °.

  The in-home communication unit 24 connects the sensor terminal 2 and the monitoring terminal 3 so that they can communicate with each other. For this purpose, the in-home communication unit 24 includes an interface circuit for wireless communication when, for example, the sensor terminal 2 and the monitoring terminal 3 are connected in accordance with a predetermined wireless communication method such as specific low power wireless communication. Alternatively, the in-home communication unit 24 may include an interface circuit that terminates a communication line that connects the sensor terminal 2 and the monitoring terminal 3.

  The speaker 25 outputs the audio data received from the sensor processing unit 27 as an audio signal.

  The storage unit 26 includes, for example, a nonvolatile semiconductor memory, and stores various information and programs used in the sensor terminal 2.

The storage unit 26 is for entering the entire monitoring area, each partial area (entrance area, regular monitoring area) within the monitoring area, the entrance from outside the monitoring area to the monitoring area, that is, entering from outside the site into the site. It functions as map information storage means for storing map information representing the position of the site entrance, the position of the boundary with the indoor area, and the position of the entrance of the building.
For example, the storage unit 26 holds the information of the monitoring area 200 shown in FIG. 2 as map information expressed in a two-dimensional coordinate system with the position of the lower left corner of the monitoring area 200 as the origin. In the monitoring area 200, the boundary with the area outside the site is defined by the coordinates of the outer side, and the boundary with the building is defined by the coordinates of the inner side. And the area | region except the area | region enclosed by the inner side used as the boundary with a building among the areas enclosed by the outer side is set as the range of the monitoring area 200. FIG.
In addition, information indicating the range of each partial area in the monitoring area 200 such as the entrance area 201 and the regular monitoring area 202 is defined as an area surrounded by the boundary lines of the partial areas. Further, the position of the site entrance 220 is defined as a region having a predetermined width adjacent to the site entrance 220 on the map indicating the monitoring area 200. Similarly, the position of the entrance 230 of the building is a certain width adjacent to the entrance 230. It is defined as an area.

In addition, the storage unit 26 has an installation position of the sensor terminal 2 in the monitoring area as information necessary for the sensor processing unit 27 to calculate the position of the person detected in the monitoring area from the distance measurement data by the sensor 21. , The reference direction of the scanning range of the sensor 21 (for example, the center direction of the scanning range), the reference measurement data by the sensor 21 measured in a state where there is no person in the monitoring area, and the like.
Furthermore, the storage unit 26 uses the reference direction (for example, the detection range of the tag reader 22 as information necessary for the sensor processing unit 27 to associate the person detected in the monitoring area with the tag identification code detected by the tag reader 22). , The center direction of the detection range), the tag identification code of the wireless tag 5 registered in advance by the user (hereinafter referred to as user identification code), and the like.
Further, the storage unit 26 stores the identification code of the sensor terminal 2. Then, the storage unit 26 outputs the stored information and program to the sensor processing unit 27. Alternatively, the storage unit 26 stores information received from the sensor processing unit 27.

  The sensor processing unit 27 has at least one processor and its peripheral circuits. The sensor processing unit 27 controls each unit of the sensor terminal 2. In addition, the sensor processing unit 27 transmits an image captured by the camera 23 to the monitoring terminal 3 via the home communication unit 24. In addition, when the sensor processing unit 27 receives voice data such as a warning message from the monitoring terminal 3, the sensor processing unit 27 transmits the voice data to the speaker 25.

  The sensor processing unit 27 detects a person in the monitoring area based on the distance measurement data for one cycle received from the sensor 21, and detects the detected person and the wireless tag 5 detected by the tag reader 22. Associate. Therefore, the sensor processing unit 27 includes a moving body detection unit 271, an identical person determination unit 272, and an authority identification unit 273 as functional modules implemented by software operating on the processor.

  The moving body detection means 271 compares the distance measurement data received from the sensor 21 with the reference measurement data stored in the storage unit 26, extracts the direction (scanning azimuth) in which the distance change is greater than a predetermined value, and extracts a predetermined value. A distance change direction group having the above continuity (for example, the size of a general person) is detected as a person who has entered the monitoring area. The moving body detection means 271 then displays the map information stored in the storage unit 26, the installation position coordinates of the sensor terminal 2, the reference direction of the scanning range of the sensor 21, and the representative distance measurement data ( For example, the position of the person in the monitoring area (that is, the position coordinates on the map information) is calculated from the scanning direction and the measurement distance at the center of the distance change direction group. Since the calculation of such a position can be performed by a simple coordinate system conversion operation, its details are omitted. In addition, the moving object detection unit 271 compares the position coordinates of each person with the range of each partial area included in the map information, and determines which partial area the position of the person is included in. In addition, when a plurality of distance change direction groups are extracted, the moving body detection unit 271 determines whether or not each distance change direction group is a person, calculates the position of the person, and determines the position of the person. Determine which partial area is included.

The same person determination means 272 determines whether or not the person detected in the current scan is the person detected in the previous scan. For example, any of various known tracking processes can be used to determine whether or not the person is detected in the previous scan. For example, if the distance between the position of the person of interest detected in the current scan and the position of any person detected one scan before is less than or equal to a predetermined distance estimated from the person's movable speed, the same person The determination unit 272 determines that the person of interest is the same person as the person detected one scan before. Further, it is confirmed that the difference between the size of the distance change direction group of the person of interest detected in the current scan and the size of the distance change direction group of any person detected before one scan is equal to or less than a predetermined value. It is good also as judgment conditions.
When it is determined that the person of interest in the current scan and any person detected one scan before are the same person, the same person determination unit 272 is assigned to the person determined to be the same person one scan before. A person identification code is assigned to the person of interest. On the other hand, when it is not determined that the person of interest in the current scan and any person detected one scan before are the same person, the same person determination unit 272 determines that the person of interest is a person who has newly entered the monitoring area, A new person identification code is assigned to the person of interest.

Based on the tag identification code received from the tag reader 22, the authority identifying unit 273 determines whether the person of interest corresponds to the wireless tag 5, that is, whether the person is a permitted person or a non-permitted person.
The authority identifying unit 273 determines whether tag data has been received from the tag reader 22 when the moving body detecting unit 271 detects a person. If the tag data is not received, it is determined that the person of interest does not correspond to the wireless tag 5. If the tag data is received, the received tag identification code is registered in the storage unit 26 in advance. It is determined whether it matches any of the identification codes. If it does not match any user identification code, it is determined that the person of interest does not correspond to the wireless tag 5, and if it matches any user identification code, further, the scanning direction of the representative distance measurement data of the person of interest, It is determined whether or not the difference in orientation in the tag data is a predetermined value (for example, 5 °) or less. Then, if the difference between the scanning direction of the representative distance measurement data of the person of interest and the direction of the tag data is equal to or less than a predetermined value, it is determined that the person of interest corresponds to the wireless tag 5.
The authority identifying unit 273 does not determine whether the difference between the scanning direction of the representative distance measurement data of the person of interest and the direction of the tag data is equal to or less than a predetermined value, and the direction of the tag data indicates the person of interest. It may be determined whether or not the person of interest corresponds to the wireless tag 5 by determining whether or not the subject is within the range of the distance change direction group.

  When the moving body detecting unit 271 detects a person, the sensor processing unit 27 detects the person's person identification code, time information indicating the detected time, position information indicating the detected position and a partial area of the position, Tag link information indicating whether or not the person corresponds to the wireless tag 5 and a tag identification code are transmitted as sensor detection information to the monitoring terminal 3 via the in-home communication unit 24 together with the identification code of the sensor terminal 2. Note that the tag link information indicates that the tag link is present when the detected person corresponds to the wireless tag 5, and the tag link is absent when the detected person does not correspond to the wireless tag 5.

  FIG. 4 is a flowchart showing the operation of the person detection process by the sensor processing unit 27. The operation flow described below is mainly executed by the sensor processing unit 27 in cooperation with each unit of the sensor terminal 2 based on a program stored in the storage unit 26 in advance. The flowchart shown in FIG. 4 is executed at the timing when ranging data is received from the sensor 21.

  When receiving the distance measurement data from the sensor 21, the moving body detection unit 271 compares the received distance measurement data with the reference measurement data, and determines whether a person exists in the monitoring area (step S401). If no person is present in the monitoring area, the sensor processing unit 27 ends a series of steps. On the other hand, if a person is present in the monitoring area, the sensor processing unit 27 moves the process to step S402. Note that the processing in steps S402 to S412 is executed for each detected person. In step S402, the moving body detection unit 271 calculates the position of the person of interest and determines in which partial area the position of the person of interest is included (step S402).

  Next, the same person determination unit 272 determines whether or not the person of interest detected in the current scan is a person detected in the previous scan (step S403). When the person of interest is a person detected in the previous scan (Yes in step S404), the same person determination unit 272 assigns the person identification code already assigned in the previous scan to the person of interest (step S405). . On the other hand, if the person of interest is not the person detected in the previous scan (No in step S404), the same person determination unit 272 assigns a new person identification code to the person of interest (step S406).

  Next, the authority identifying unit 273 determines whether tag data has been received from the tag reader 22 (step S407). If tag data is received, the authority identifying unit 273 determines whether the tag identification code matches any of the user identification codes registered in advance in the storage unit 26 (step S408). If the user identification code matches one of the user identification codes, the authority identification unit 273 determines whether or not the difference between the detected direction of the person of interest and the detected direction of the detected wireless tag 5 is equal to or smaller than a predetermined value (step S409). ). When the difference between the detected orientation of the person of interest and the detected orientation of the detected wireless tag 5 is equal to or less than a predetermined value, the authority identifying unit 273 determines that the person of interest corresponds to the wireless tag 5, that is, is an authorized person. (Step S410). On the other hand, when tag data is not received, when it does not match any user identification code, or when the difference between the scanning direction of the detected representative distance measurement data of the person and the direction in the tag data is larger than a predetermined value, The authority identifying unit 273 determines that the person of interest does not correspond to the wireless tag 5, that is, is a non-permitted person (step S411).

  Next, the sensor processing unit 27 transmits the person identification code, the time information, the position information, the tag link information, and the tag identification code together with the identification code of the sensor terminal 2 to the monitoring terminal 3 (step S412). . When the processes of steps S401 to S412 are completed for all detected persons, the sensor processing unit 27 ends the series of steps.

  FIG. 5 is a schematic configuration diagram of the monitoring terminal 3. The monitoring terminal 3 includes a home communication unit 31, a center communication unit 32, a storage unit 33, and a monitoring processing unit 34.

The in-home communication unit 31 connects the monitoring terminal 3 and the sensor terminal 2 so that they can communicate with each other. For this purpose, the in-home communication unit 31 includes, for example, an interface circuit for wireless communication when the monitoring terminal 3 and the sensor terminal 2 are connected according to a predetermined wireless communication method such as specific low-power wireless communication. Alternatively, the in-home communication unit 31 may include an interface circuit that terminates a communication line that connects the monitoring terminal 3 and the sensor terminal 2.
Then, the in-home communication unit 31 transmits the control signal, audio data, and the like output from the monitoring processing unit 34 to the sensor terminal 2. The in-home communication unit 31 receives a person identification code, time information, position information, tag link information, tag identification code, image signal, or the like for the person detected by the sensor terminal 2 from the sensor terminal 2, and the monitoring processing unit 34. To pass.

  The center communication unit 32 has an interface circuit for connecting the monitoring terminal 3 to a public communication line. For example, when the center communication unit 32 notifies the monitoring center device 6 that a suspicious person has been detected, the center communication unit 32 performs connection processing between the monitoring terminal 3 and the monitoring center device 6 according to the control of the monitoring processing unit 34. Then, after the connection is established between the monitoring terminal 3 and the monitoring center device 6, the center communication unit 32 receives the identification code of the security system 1 or the building where the security system 1 is installed received from the monitoring processing unit 34, and the suspicious An abnormality notification signal indicating that the person has been detected is transmitted to the monitoring center device 6 via the public communication line. The center communication unit 32 may also transmit an image captured by the sensor terminal 2 to the monitoring center device 6 via a public communication line. The center communication part 32 will perform the process which open | releases the connection between the monitoring terminal 3 and the monitoring center apparatus 6, after the notification of the above various information is complete | finished.

The storage unit 33 includes, for example, a nonvolatile semiconductor memory, and stores various information and programs used in the monitoring terminal 3. Similar to the storage unit 26 of the sensor terminal 2, the storage unit 33 functions as a map information storage unit and stores the map information of the monitoring area.
Further, the storage unit 33 stores an identification code of each sensor terminal 2 connected to the monitoring terminal 3, coordinates indicating an installation position of each sensor terminal 2 in the monitoring area, and the like.
Furthermore, when there is a person detected in the monitoring area, the storage unit 33 stores tracking data set for the person. Details of the tracking data will be described later.
Further, the storage unit 33 may store an image received from each sensor terminal 2. Then, the storage unit 33 outputs the stored information and program to the monitoring processing unit 34. Alternatively, the storage unit 33 stores information received from the monitoring processing unit 34.

  The monitoring processor 34 has at least one processor and its peripheral circuits. The monitoring processing unit 34 has a timer circuit. Then, the monitoring processing unit 34 controls each unit of the monitoring terminal 3. Further, the monitoring processing unit 34 determines whether or not the person in the monitoring area is a suspicious person based on the information received from each sensor terminal 2, and executes various warning processes. Therefore, the monitoring processing unit 34 includes a position tracking unit 341, a behavior detection unit 342, and a determination unit 343 as functional modules implemented by software operating on the processor.

When the position tracking unit 341 receives information about a person existing in the monitoring area from the sensor terminal 2 via the home communication unit 31, the position tracking unit 341 records tracking data for the person in the storage unit 33 to track the position of the person. To do.
FIG. 6 shows an example of tracking data. As shown in FIG. 6, the tracking data is managed for each person identification code 601 and includes time 602, position (area) 603, tag link information 604, tag identification code 605, permission flag 606, and event information 607. For convenience, a word indicating the content is shown in each column of FIG. 6, but a code corresponding to the word is actually stored in the storage unit 33.
When the newly received person identification code is already recorded in the tracking data, the position tracking unit 341 displays the received time information, position information, tag link information, and tag identification code as information immediately before the person identification code, respectively. Is recorded in the fields of time 602, position 603, tag link information 604, and tag identification code 605 in the next line. On the other hand, if the newly received person identification code is not yet recorded in the tracking data, the position tracking unit 341 newly adds the person identification code to the tracking data, and receives the received time information, position information, and tag link information. The tag identification code is recorded in the fields of time 602, position 603, tag link information 604, and tag identification code 605 in the first row of the added person identification code.

  The behavior detection unit 342 generates an event about the behavior of a person in the monitoring area based on the tracking data when the position tracking unit 341 updates the tracking data, when a timer described later expires, or at regular intervals. And the identification code of the detected event is recorded in the event information 607 in the tracking data.

  The determination unit 343 executes processing corresponding to each event detected by the behavior detection unit 342, and determines whether or not there is a suspicious person in the monitoring area.

  FIG. 7 is a flowchart showing an operation of processing based on the tracking data by the monitoring processing unit 34. The operation flow described below is mainly executed by the monitoring processing unit 34 in cooperation with each unit of the monitoring terminal 3 based on a program stored in the storage unit 33 in advance. The flowchart shown in FIG. 7 is executed at a timing when information about a person existing in the monitoring area is received from the sensor terminal 2.

  When the position tracking unit 341 receives information about the person existing in the monitoring area from the sensor terminal 2, the position tracking unit 341 determines whether or not the received person identification code is already recorded in the tracking data (step S701). When the received person identification code is already recorded in the tracking data, the position tracking unit 341 receives the time information and position information received in each column of the line next to the line where the immediately preceding information in the person identification code is recorded. The tag link information and the tag identification code are recorded (step S702). On the other hand, if the received person identification code is not yet recorded in the tracking data, the position tracking unit 341 newly adds the person identification code to the tracking data and receives it in each column of the first line of the added person identification code. The recorded time information, position information, tag link information, and tag identification code are recorded (step S703).

  When the position tracking unit 341 updates the tracking data and tracks the position of the person in step S702 or step S703, the behavior detecting unit 342 determines whether each event has occurred based on the tracking data (step S704). . The behavior detecting unit 342 ends the series of steps when the occurrence of the event is not detected. On the other hand, when detecting the occurrence of an event, the behavior detecting unit 342 records an identification code of the detected event in the event information 607 (step S705). Next, the determination unit 343 executes processing corresponding to the event detected by the behavior detection unit 342 (step S706), and ends a series of steps.

  Hereinafter, each event will be described. The generated events include an entrance event, an exit event, a stay event, a movement event, an entrance event, and an exit event.

The entrance event is an event indicating that a new person has entered the monitoring area from the off-site area.
The behavior detection unit 342 determines that an entrance event has occurred when a new person identification code is added to the tracking data and the position 603 of the person at that time is near the boundary with the off-site area.

When it is detected that an entry event has occurred, the determination unit 343 permits entry into the monitoring area if the person is a permitter. On the other hand, if the person is a non-permitted person and enters from other than the entrance to the site, the person is determined to be a suspicious person who has illegally entered the site regardless of the entrance area or the regular monitoring area. Also, if the person is a non-permitted person and enters from the entrance of the site, the person is not immediately determined to be a suspicious person, but the determination of whether or not the person is a suspicious person is suspended, and a specific tracking is performed in the subsequent tracking. Temporarily allow entry into the entrance area until behavior is detected. More specifically, the person is allowed to stay in the entrance area for a predetermined permission time. This permission time is the estimated time that a person may perform some suspicious behavior (for example, picking, peeping, breaking glass), etc. in the entrance area. Or longer than the time required for temporary work such as delivery. For example, this permission time is set to 30 seconds. How to set the permission time is appropriately optimized according to the size of the monitoring area, the monitoring purpose, and the like.
In this way, by making the judgment criteria for judging a person entering from the site entrance as a suspicious person more strict than the judgment criteria for judging a person entering from outside the site entrance as a suspicious person, a delivery person, a visitor, etc. When a person who does not have the wireless tag 5 enters from the entrance of the site due to legitimate circumstances, it is possible to prevent the occurrence of false alarms by determining such a person as a suspicious person. On the other hand, it is possible to detect and report early suspicious persons who do not have a wireless tag that has entered from outside the site entrance.

FIG. 8 is a flowchart showing the operation of the processing when the entrance event occurs, which is executed by the determination means 343.
When the occurrence of an entrance event is detected, the determination unit 343 determines whether or not the person who has newly entered the monitoring area is a permitter, depending on whether the tag link information 604 is linked or not (Step S3). S801). If the person is a permitter, the determination unit 343 permits the person to enter the entrance area (step S802) and ends the series of steps. On the other hand, when the person is a non-permitted person, the determination unit 343 determines whether the person has entered from the entrance of the site based on whether the position 603 of the person is near the entrance of the site (step S803). .
If the person has entered from outside the site entrance, the determination unit 343 determines that the person is a suspicious person, and detects an abnormal intrusion error indicating that the person has entered the monitoring area via the operation indicator 4. In addition to notifying the user in the building, the monitoring center device 6 is notified (step S804), and the series of steps is completed. At this time, the determination unit 343 may transmit the voice data of the warning message to the sensor terminal 2 and output it from the speaker 25. In addition, since a person who is determined to be a suspicious person may further enter the building, the monitoring processing unit 34 continuously tracks the suspicious person.
On the other hand, when the person enters from the entrance of the site, the determination unit 343 holds the determination whether the person is a suspicious person, sets the permission flag 606 of the person to ON, and enters the entrance area. The entry is temporarily permitted (step S805). In this case, the determination unit 343 continuously tracks the non-permitted person who has temporarily permitted entry into the entrance area. Therefore, the determination unit 343 activates a timer for confirming whether or not the person remains in the entrance area after the permission time has elapsed (step S806), and ends a series of steps. This permission time is counted for each person who enters from the entrance of the site.

  The temporary permission to enter the entrance area described above is set for each person. Therefore, even if a temporarily authorized person already exists in the entrance area, if another person enters the entrance area from other than the entrance to the site, the person is determined to be a suspicious person, and a perimeter intrusion abnormality is notified. The On the other hand, when a person who has been temporarily permitted is already present in the entrance area and another person enters from the entrance of the site, a temporary permission is also set for that person separately, and the permission time for that person is set. A timer for timing is newly started.

The exit event is an event indicating that a person has exited from the monitoring area to the off-site area.
If the information about the person recorded in the tracking data is not continuously notified from the sensor terminal 2 for a certain period of time and the last position 603 of the person is in the vicinity of the boundary with the off-site, the behavior detecting unit 342 exits. Determine that an event has occurred. For example, the certain period can be a period corresponding to one scan or a plurality of scans in the sensor 21 of the sensor terminal 2.

  When the determination unit 343 detects the occurrence of the exit event, the determination unit 343 ends the tracking process for the person. That is, the determination unit 343 deletes information about the person (person identification code) from the tracking data. The information about the person may be deleted after being held for a certain period of time so that the user can confirm it. If the person is determined to be a suspicious person, the information about the person may not be deleted until the monitoring device confirms that the suspicious person has been detected and a recovery signal is input.

The stay event is an event indicating that the time during which the non-permitted person who has temporarily permitted entry into the entrance area has stayed in the entrance area has exceeded the permitted time.
The behavior detection unit 342 determines that a stay event has occurred for a person whose tracking data permission flag 606 is set to ON when the timer that is counting time has completed counting the permission time.

  When the occurrence of the stay event is detected, the determination unit 343 determines that the person is a suspicious person who has entered to execute some suspicious behavior. Then, the determination unit 343 notifies the monitoring center device 6 of the outer peripheral intrusion abnormality to the user in the building via the operation indicator 4.

The movement event is an event indicating that a person has entered the regular monitoring area from the entrance area.
If there is a person whose position 603 has changed from a position in the entrance area to a position in the regular monitoring area in the tracking data, the behavior detection unit 342 determines that a movement event has occurred.

  When the occurrence of the movement event is detected, the determination unit 343 determines whether the person is a permitted person or a non-permitted person depending on whether the tag link information 604 of the tracking data is linked or not. And the determination means 343 does not perform a process in particular, when the person is an authorized person. On the other hand, if the person is a non-permitted person, it is further determined whether or not the person is a non-permitted person who has temporarily permitted entry into the entrance area depending on whether or not the permission flag 606 is ON. If the person is not a non-permitted person who has temporarily permitted entry into the entrance area, the person has already been determined to be a suspicious person and has been notified of an abnormal invasion of the outer periphery, so no particular processing is performed. On the other hand, if the person is a non-permitted person who has temporarily permitted entry into the entrance area, the person is determined to be a suspicious person who has illegally entered for the purpose of empty burial or hiding. Then, the determination unit 343 notifies the monitoring center device 6 of the outer peripheral intrusion abnormality to the user in the building via the operation indicator 4.

The entrance event is an event indicating that the person has moved from the monitoring area to the indoor area (building).
The behavior detection unit 342 enters the building when the information about the person recorded in the tracking data is not continuously notified from the sensor terminal 2 for a certain period, and the last position 603 of the person is near the boundary with the building. Determine that an event has occurred. For example, the certain period can be a period corresponding to one scan or a plurality of scans in the sensor 21 of the sensor terminal 2.

  When the occurrence of an entrance event is detected, the determination unit 343 determines whether the person is a permitted person or a non-permitted person depending on whether the tag link information 604 of the tracking data is linked or not. And the determination means 343 does not perform a process in particular, when the person is an authorized person. On the other hand, if the person is a non-permitted person, the person is determined to be a suspicious person who has illegally entered the building for the purpose of a vacant nest or the like. Then, the determination unit 343 notifies the user who is in the building via the operation display 4 of the abnormal invasion of the building indicating that the intrusion has entered the building and also notifies the monitoring center device 6.

The leaving event is an event indicating that a person has left the indoor area (building) and entered the monitoring area.
If a person identification code is newly added to the tracking data and the position 603 of the person at that time is near the boundary with the indoor area, the behavior detection unit 342 determines that an exit event has occurred.

  When the person who has left the building is a non-permitted person, it is assumed that a visitor is about to leave the building or that a user such as a resident of the building has forgotten the wireless tag 5 and has come out. Therefore, when the exit event is detected, the determination unit 343 permits entry into the entrance area when the person is a permitter, similarly to when the entrance event is detected. When is a non-permitted person, a permission flag is set for the person, and a stay in the entrance area is temporarily permitted for a predetermined permission time.

  Note that the event generation detection process and the process corresponding to the detected event shown in steps S704 to S706 of the flowchart shown in FIG. 7 are not only performed when the position tracking unit 341 updates the tracking data, but also at regular intervals. To be executed. This is because a process corresponding to a case where a person moves from the monitoring area to the off-site area or the indoor area and cannot be detected by the sensor terminal 2 like an exit event or an entrance event is executed. For example, the certain period can be a period corresponding to one scan or a plurality of scans in the sensor 21 of the sensor terminal 2. Further, the above processing is executed when the timer started by the entrance event expires. This is because, when a non-permitted person who has temporarily permitted stay in the monitoring area stays beyond the permitted time, such as a staying event, the corresponding processing is surely executed.

As described above, the security system according to one embodiment of the present invention individually tracks a person who has entered the monitoring area and does not determine that the permitter is a suspicious person. For non-permitted persons, a person who has entered from outside the site entrance is determined as a suspicious person, and a person who has entered from the site entrance is not immediately determined to be a suspicious person and is temporarily allowed to enter. Thus, this security system can accurately detect a suspicious person and give a report or warning before the illegal intrusion into the building occurs, and can prevent the illegal intrusion into the building. Furthermore, since this security system can prevent a person who temporarily enters the premises, such as a delivery person, from entering the premises from being mistakenly recognized as a suspicious person, it is possible to suppress the occurrence of false information regarding suspicious person detection. Thus, this security system can accurately identify whether or not the person who has entered the monitoring area is a suspicious person.
In addition, when there are a plurality of persons entering the monitoring area, the security system tracks the position of each person and sets temporary allowance. As a result, the security system can accurately identify whether or not each person is a suspicious person even when a plurality of persons enter the monitoring area at different timings.
As a specific example of temporarily allowing a person who has entered from the entrance of the site, a configuration has been shown in which a grace time for allowing stay in the entrance area is set, but entry is permitted until the person moves beyond a certain distance. A configuration or a configuration that allows the person to take a specific action (moving trajectory) such as wandering around the site can also be adopted. In this case, in the tracking data of the person who is not permitted, the event detection condition is that the position history (movement trajectory) is equal to or longer than a certain distance or matches a predetermined suspicious behavior trajectory. Good. Examples of the suspicious behavior trajectory include behavior that is in the vicinity of the entrance of a building for a long time and behavior that is repeatedly moved near the entrance of the building.

  The preferred embodiments of the present invention have been described above, but the present invention is not limited to these embodiments. For example, the sensor terminal may be configured such that the tag reader and the authority identifying unit are omitted, and the sensor processing unit may not transmit the tag link information and the tag identification code to the monitoring terminal for the detected person. In that case, the position tracking means of the monitoring terminal does not record the tag link information and the tag identification code in the tracking data. In addition, when the occurrence of an entrance event is detected, the determination means does not determine whether or not the person who has newly entered the monitoring area is a permitter, and whether or not the person has entered from the entrance to the site. Only determine. Then, when the person enters from outside the site entrance, the determination means determines that the person is a suspicious person, and notifies the user and the monitoring center apparatus in the building of the outer periphery intrusion abnormality. On the other hand, when the person enters from the entrance of the site, the determination as to whether or not the person is a suspicious person is suspended and entry into the entrance area is permitted for a predetermined permission time. In this case as well, the security system prevents unauthorized entry of the suspicious person into the building, and mistakenly identifies persons who enter the premises for legitimate reasons, such as residents of the building and delivery persons. Can be suppressed. In the case of this configuration, it is desirable to provide a user authentication terminal at the building entrance or in the building so that the user can enter the building.

In addition, the sensor terminal determines the person's face in the image taken by the camera of the sensor terminal as a pre-registered user's face in order to determine whether the person in the monitoring area is a permitted person or a non-permitted person. You may collate. In this case, when the sensor terminal determines that the face of the person shown in the photographed image matches the face of any one of the users registered in advance, the person becomes the authorized person. On the other hand, if the sensor terminal determines that the face of the person shown in the photographed image does not match the face of any user registered in advance, the person is regarded as a non-permitted person. In this modification, in order to perform face matching, for example, any of various known face matching processes can be employed. In this case, the sensor terminal may not have a tag reader.
In addition, the sensor terminal captures a plurality of images captured by the camera and a background difference between a background image stored in advance in a storage unit and captured in the case where there is no person in the monitoring area, or sequentially captured by the camera. A person may be detected by extracting a change area on an image based on an inter-frame difference between images. In this case, the sensor terminal obtains the distance measurement data of the person from the position in at least one monitoring area in the change area.

Further, each sensor terminal may be configured to perform a part of processing in the monitoring processing unit of the monitoring terminal. For example, the sensor processing unit of each sensor terminal may track the position of a person existing in the monitoring area, detect the occurrence of each event based on the tracking data, and execute processing corresponding to each event. May be.
Conversely, the monitoring terminal may be configured to perform a part of processing in the sensor processing unit of each sensor terminal. For example, the monitoring processing unit of the monitoring terminal may calculate the position of the person in the monitoring area, may determine whether the sequentially detected persons are the same person, or the person is the authorized person Or non-permitted.
Or you may comprise a sensor terminal and a monitoring terminal with one apparatus.

Moreover, the monitoring terminal is not limited to the outer periphery of the building surrounded by the monitoring area, and may be installed in other places. Alternatively, the monitoring terminal may be a terminal carried by the user. In this case, for example, a relay device is installed in the outer periphery of the building in the monitoring area or in the building. This relay apparatus has an interface circuit for communicating with each sensor terminal and a wireless interface circuit for wirelessly communicating with a monitoring terminal carried by the user, and relays information from each sensor terminal to the monitoring terminal. Send.
The monitoring area is not limited to the site of a detached house, but may be an office, a site of a factory, or the like. In this case, the indoor area is, for example, a room of an office or a factory building.
As described above, those skilled in the art can make various modifications in accordance with the embodiment to be implemented within the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Security system 2 Sensor terminal 3 Monitoring terminal 4 Operation indicator 5 Wireless tag 6 Monitoring center apparatus 21 Sensor 22 Tag reader 23 Camera 24 Memory | storage part 25 In-home communication part 26 Speaker 27 Sensor processing part 271 Mobile body detection means 272 Same person determination means 271 Authority identifying unit 274 Notifying unit 31 Home communication unit 32 Center communication unit 33 Storage unit 34 Monitoring processing unit 341 Location tracking unit 342 Action detection unit 343 Determination unit

Claims (5)

A security system for monitoring the intrusion of suspicious objects into a monitoring area set in at least a part of the area around the restricted access area,
Storage means for storing the position of the entrance of the monitoring area;
Detecting means for detecting the position of the moving object existing in the monitoring area;
Position tracking means for tracking the position of each detected moving body;
Determination means for determining the moving body as a suspicious object based on the tracking information of the moving body,
The determination means uses a criterion that determines a moving body that has entered from the entrance of the monitoring area as the suspicious object, and a criterion that is stricter than a determination criterion that determines that the mobile body that has entered from other than the entrance is the suspicious object. Security system characterized by that.   The determination means determines a moving body that has entered from a place other than the entrance as the suspicious object, and for the mobile body that has entered from the entrance, the following tracking information for each moving body matches the specific action. The security system according to claim 1, wherein the security system is determined as a suspicious object.   3. The determination unit according to claim 2, wherein the determination unit measures the time spent in the monitoring area for each moving object that has entered from the entrance, and determines that the moving object staying for a predetermined time is a suspicious object. The security system described. The storage means stores a range of an entrance area including an area connecting the entrance of the monitoring area and the entrance of the entry restricted area in the monitoring area,
The security system according to claim 3, wherein the determination unit permits a stay within the predetermined time in the entrance area for each moving body that has entered from the entrance of the monitoring area. The storage means stores a boundary position between the monitoring area and the entry restricted area,
The said determination means determines the said mobile body as a suspicious object, if it detects that the mobile body which approached from the entrance of the said monitoring area moved to the said entry control area, The Claim 1 characterized by the above-mentioned. Security system.

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