JP2013025752A - Security system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a security system capable of accurately detecting a suspicious person who was not temporarily detected due to an existence of another person in a monitoring area.SOLUTION: The security system 1 includes: detection means 21 for detecting a position of a person existing in a monitoring area; position tracking means 341 for tracking a person by recording a history of positions for each person detected; suspicious person determination means 343 for determining whether a person is a suspicious person on the basis of his/her history of positions; and separation determination means 342 for determining whether a person newly detected is a separated person who has existed in a dead angle of a person being tracked. When the person newly detected is a separated person, the suspicious person determination means 343 retroactively determines whether the person is a suspicious person by using a history of positions recorded for the person being tracked as a history of positions of the separated person.

Description

  The present invention relates to a security system for monitoring a person who 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.
Whether the person who entered the house garden is a suspicious person, because there are various possibilities for entering the house yard, such as deliverers who deliver deliveries, general visitors, etc. Need to be accurately identified. However, when the above security system is operated with the garden of a house as a monitoring area, even if there is a person who does not have a wireless tag in a blind spot by a user who has a wireless tag, for example, There was a possibility that it could not be detected as a suspicious person and could not be reported.

  Therefore, an object of the present invention is to provide a security system capable of accurately detecting a suspicious person who has not been temporarily detected due to the presence of another person in the monitoring area.

  As one form of this invention, the security system which monitors the suspicious person's invasion to a monitoring area is provided. The security system includes detection means for detecting the position of a person existing in the monitoring area, position tracking means for recording a position history for each detected person and tracking the person, and suspicious persons based on the position history. A suspicious person determining means for determining whether or not the person is a person and a separation determining means for determining whether or not the newly detected person is a separated person existing in the blind spot of the person being tracked. If the newly detected person is a separated person, the person determination means retrospectively determines whether the separated person is a suspicious person by using the position history recorded for the person being tracked as the position history for the separated person. Judgment.

  Further, it is preferable that the separation determination means determine that the person is a separated person when the position of the newly detected person is in the vicinity of the person being tracked.

  In addition, it is preferable that the separation determination unit determines that the person is a separated person when the position of the newly detected person is not the edge of the monitoring area.

  Also, identification information acquisition means for acquiring person identification information and authority identification for determining authority based on the identification information for each detected person, whether it is a pre-registered authorized person or a non-permitted person who is not an authorized person The suspicious person determining means is a means for determining a suspicious person by detecting a specific action by a non-permitted person based on a position history and a result of authority determination. If it is determined that the person is a non-permitted person who is in the blind spot of the licensor who is being tracked, the history of the position recorded for the licensor who is being tracked It is preferable to make a retrospective determination as a history.

  The security system according to the present invention has an effect of accurately detecting a suspicious person that has not been temporarily detected due to the presence of another person in the monitoring area.

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. It is a flowchart which shows the operation | movement of the detection process of a separation event performed by an event detection means. It is a flowchart which shows the operation | movement of the process at the time of isolation | separation event performed by the determination means.

Hereinafter, a security system for detecting a suspicious person who has entered a monitored area and issuing an alarm, which is one embodiment of the present invention, will be described with reference to the drawings. This security system monitors the entrance of a suspicious person 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. This security system tracks the position of a person existing in the second monitoring area for each person. Then, when a person who is present at a blind spot by the person being tracked and is not detected is newly detected, the tracking data of the person being tracked is used as the newly detected person tracking data and is newly detected. The behavior of the selected person is analyzed retroactively to determine whether the person is a suspicious person. As a result, the security system can accurately detect a suspicious person that has not been temporarily detected due to the presence of another person.
In this embodiment, a building of a detached house corresponding to an entry restricted area that does not allow entry by an unspecified person is taken as an example of the first monitoring area. The 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 a person present in the monitoring area and obtains the position of the detected person. 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. For this purpose, the monitoring processing unit 34 includes a position tracking unit 341, an event 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 event detection unit 342 detects the event corresponding to the action of the 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. It is behavior detection means for detecting occurrence. When detecting the occurrence of an event, the event detection unit 342 records an identification code of the detected event in the event information 607 in the tracking data.

  The determination unit 343 executes processing corresponding to each event detected by the event 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 event detection unit 342 determines whether each event has occurred based on the tracking data (step S704). . When the event detection unit 342 does not detect the occurrence of an event, the event detection unit 342 ends the series of steps. On the other hand, when detecting the occurrence of an event, the event detection unit 342 records the identification code of the detected event in the event information of the tracking data (step S705). Next, the determination unit 343 executes processing corresponding to the event detected by the event 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, an exit event, and a separation event.

The entrance event is an event indicating that a new person has entered the monitoring area from the off-site area.
The event detection unit 342 determines that an entrance event has occurred when a new person identification code is added to the tracking data shown in FIG. 6 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 suspicious behavior is detected. More specifically, the person is allowed to stay in the entrance area for a predetermined permission time. This permission time is estimated to be a time when a person may perform some suspicious action (for example, picking, peeping, breaking glass), etc. in the entrance area. It is set longer than the time required for temporary work such as turning back and 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 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 a person who has newly entered the monitoring area is a permitted person, depending on whether the tag link information in the tracking data is linked or not. (Step 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 means 343 determines whether the person has entered from the entrance of the site, based on whether the position of the person in the tracking data 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 of the person in the tracking data to ON, and enters the entrance area. Is temporarily permitted to enter (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.
The event detection means 342 is not notified of information about the person recorded in the tracking data shown in FIG. 6 continuously from the sensor terminal 2 for a certain period, and the last position 603 of the person is near the boundary with the outside of the site. If there is, it is determined that an exit 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 event detection unit 342 determines that a staying event has occurred for a person whose tracking data permission flag 606 shown in FIG. 6 has been timed for a person whose time is being counted for the person whose time is being counted.

  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 perform some suspicious action. 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 moved from the entrance area to the regular monitoring area.
In the tracking data shown in FIG. 6, the event detection unit 342 determines that a movement event has occurred when there is a person whose position 603 has changed from a position in the entrance area to a position in the regular monitoring area.

  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 event detection means 342 is not notified of information about the person recorded in the tracking data shown in FIG. 6 continuously from the sensor terminal 2 for a certain period, and the last position 603 of the person is near the boundary with the building. If there is, it is determined that an admission 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.
The event detection means 342 determines that an exit event has occurred when a person identification code is newly added to the tracking data shown in FIG. 6 and the position 603 of the person at that time is near the boundary with the indoor area. .

  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.

The separation event is an event indicating that a person who has not been detected so far by the person being tracked is newly detected.
For example, a non-permitted person who does not hold the wireless tag 5 such as when a non-permitted person enters a position that becomes a blind spot by a permitted person existing in the entrance area, that is, a position behind the permitted person as viewed from the sensor 21. There are cases where the sensor 21 does not detect the vehicle although it has entered the entrance area. If the permitter or non-permitted person moves, the non-permitted person will be detected again, but if the non-permitted person is not a suspicious person simply by tracking the subsequent actions without considering the action up to that point May be delayed.
Therefore, when a person is newly detected at a position that is not near the boundary position of the monitoring area, the event detection unit 342 determines that the person has not been detected by a person who already exists in the monitoring area, It is determined that a separation event has occurred. When the position of the newly detected person is far from the position of the person existing in the monitoring area, the possibility that the newly detected person is in the blind spot of the person existing in the monitoring area is low. Therefore, the event detection unit 342 does not detect as a separation event when the position of the new person is not in the vicinity of the position of the person already existing in the monitoring area. The vicinity in this case can be set to the range of the maximum distance (for example, 1 m) that the person can move in the scanning cycle (for example, 200 msec) of the sensor 21 of the sensor terminal 2.

FIG. 9 is a flowchart showing the operation of the separation event detection process executed by the event detection unit 342. The flowchart shown in FIG. 9 shows processing corresponding to step S704 of the flowchart shown in FIG.
When the position tracking unit 341 updates the tracking data, the event detection unit 342 determines whether a new person identification code is added to the tracking data (step S901). When a new person identification code is added to the tracking data, the event detection means 342 determines that the position of the person of the newly added person identification code in the tracking data is near the boundary position of the monitoring area (that is, the edge of the monitoring area). ), It is further determined whether or not the person has entered from outside the monitoring area (step S902). When the position of the newly detected person is not in the vicinity of the boundary position of the monitoring area, the event detection unit 342 determines the position of the other person whose position of the newly added person in the tracking data is already recorded in the tracking data. It is further determined whether or not the person is a separated person appearing from the blind spot of the person being tracked (step S903). If the position of the newly detected person is in the vicinity of the person already existing in the monitoring area, the event detection unit 342 determines that a separation event has occurred (step S904), and ends a series of steps. On the other hand, when a new person identification code is not added to the tracking data, the position of the newly detected person is near the boundary position of the monitoring area, or the position of the newly detected person is already in the monitoring area If it is not in the vicinity of the person who was present in the event, the event detection means 342 ends the series of steps without performing any particular processing.

  Note that either one of the determination processes in steps S902 and S903 may be omitted, or the order of the processes may be changed.

When the occurrence of the separation event is detected, the determination unit 343 detects a person (hereinafter referred to as an original person) present at the closest position among the persons being tracked in the vicinity of the newly detected person. . In the tracking data, the determination unit 343 includes a time 602, a position 603, and event information 607 from the time when the original person enters the monitoring area until immediately before detection of the newly detected person in the tracking data. Copy as complementary tracking data for newly detected person. Then, the determination unit 343 determines whether or not the newly detected person is a suspicious person by using the complementary tracking data, and updates the subsequent tracking data to the complementary tracking data. Track and monitor.
When the original person is a non-permitted person, it is not necessary to make a retrospective determination again because it is determined whether or not the person is a suspicious person when each event occurs. If the newly detected person is a permitter, it can be determined that the person is not a suspicious person. On the other hand, if the original person is a permitter and the newly detected person is a non-permitted person, the newly detected person may have behaved suspiciously when it was in a blind spot by the permitter There is sex. Therefore, when the original person is a permitter and the newly detected person is a non-permitted person, the determination unit 343 determines whether the newly detected person is a suspicious person using complementary tracking data. Determine whether or not. The determination unit 343 sequentially reads the complementary tracking data from the tracking data, and when an entry event, an exit event, or a movement event is recorded in the event information 607 in the complementary tracking data, these events are generated by an unauthorized person. As a thing, the process corresponding to each event is executed.

FIG. 10 is a flowchart showing the operation of processing when a separation event occurs, which is executed by the determination unit 343.
When the occurrence of the separation event is detected, the determination unit 343 detects the original person from the person being tracked that exists in the monitoring area (step S1001). Next, the determination unit 343 copies the information about the original person in the tracking data as information about the separated person (step S1002). Next, the determination unit 343 determines whether the original person is a permitted person or a non-permitted person depending on whether the latest tag link information of the original person is linked or not (step S1003). When the original person is a non-permitted person, the determination unit 343 terminates a series of steps without performing any particular processing. When the original person is a permitted person, the latest tag link information of the separated person is linked or not. It is further determined whether the separated person is a permitted person or a non-permitted person depending on the absence (step S1004). When the separated person is an authorized person, the determination unit 343 terminates a series of steps without performing any particular process, and when the separated person is an unauthorized person, the complementary tracking data copied in step S1002 is read (step S1005). ).
Next, the determination unit 343 determines whether an entry event, a stay event, or a movement event is recorded in the event information in the read supplementary tracking data (step S1006). When an entrance event, a stay event, or a movement event is recorded in the event information in the complementary tracking data, the determination unit 343 executes processing for the non-permitted person at the time of detecting each event (step S1007).

For example, when an entrance event is recorded in the event information in the complementary tracking data, the determination unit 343 determines whether the separated person is present depending on whether the position at the time of entering the entrance area in the complementary tracking data is near the entrance to the site. Determine whether or not you entered from the site entrance. And when approaching from other than the site entrance, the separated person is determined to be a suspicious person, and the outer periphery intrusion abnormality is notified. On the other hand, when entering from the entrance of the site, it is separated depending on whether or not the supplementary tracking data records that it was in the entrance area after the time when the admission event was recorded and the permission time was added. It is determined whether or not the person remains in the entrance area after the permission time has elapsed. Then, if it remains in the entrance area even after the permission time has elapsed, it is considered that a stay event has occurred, and the determination means 343 determines that the separated person is a suspicious person and notifies an abnormal invasion of the outer periphery. If the permission time has not yet elapsed from the time when the entry event was recorded, the timer is started so that it expires at the time when the permission time has elapsed, and the subsequent tracking is performed, and the timer completes timing. It is determined that the separated person is a suspicious person because a stay event has occurred.
Similarly, when the exit event is recorded in the event information in the complementary tracking data, the determination unit 343 determines whether the separated person remains in the entrance area after the permission time has elapsed since the exit event was recorded. If it remains in the entrance area even after the permission time has elapsed, the separated person is determined to be a suspicious person and a perimeter intrusion abnormality is notified.
When the movement event is recorded in the event information in the complementary tracking data, the determination unit 343 determines that the separated person is a suspicious person and notifies the outer perimeter intrusion abnormality.

  Next, the determination unit 343 determines whether all event information has been confirmed for the information in the complementary tracking data (step S1008). If there is event information that has not been confirmed, the process returns to step S1006. Then, the processing from step S1006 to S1008 is repeated. When the process is completed for all event information in the complementary tracking data, the determination unit 343 ends the series of steps.

  Note that, in step S1006, the determination unit 343 may determine that the separated person is a suspicious person and notify the building intrusion abnormality when the entrance event is recorded in the event information in the complementary tracking data.

In addition, when the separated person is a permitter and the original person is a non-permitted person, the determination unit 343 determines that the wireless tag 5 associated with the separated person was not owned by the original person, The previous tracking information of the original person may be retroactively determined.
In addition, the determination unit 343 omits the determination process in step S1003, and determines whether the separated person is a suspicious person or not using the complementary tracking data even when the original person is a non-permitted person. Also good.

  As a result, even if a non-permitted person enters a blind spot by a permitted person existing in the entrance area, if the non-permitted person is detected after that, it is determined whether the person is a suspicious person by going back to the time of entering the entrance area. Is re-determined. If the non-permitted person has entered the entrance area from the entrance of the site, the information at the time of entering the entrance area on the tracking data does not determine that the non-permitted person is a suspicious person. Allowed temporarily. However, if it is recorded on the tracking data that the non-permitted person has entered from other than the entrance of the site, has remained in the entrance area for longer than the permitted time, or moved to the regular monitoring area, The non-permitted person is determined to be a suspicious person, and can be notified at an early stage of the outer periphery intrusion abnormality.

  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 determines whether a person who has entered the monitoring area is a permitted person or a non-permitted person, and tracks each person individually. . Then, the permitter is not determined to be a suspicious person, and the non-permitted person is further determined whether or not it is a suspicious person based on the behavior of the non-permitted person. On the other hand, when a non-permitted person who is in a blind spot is detected by a permitted person existing in the entrance area, this security system uses the past tracking data of the permitted person as tracking data of the non-permitted person. Are analyzed retroactively to determine whether or not the unauthorized person is a suspicious person. As a result, this security system can accurately detect a suspicious person who has not been temporarily detected in the monitoring area because another person is blind spot.

  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 identification unit are omitted. The sensor processing unit does not transmit the tag link information and the tag identification code to the monitoring terminal for the detected person, and the position tracking unit of the monitoring terminal does not record the tag link information and the tag identification code in the tracking data. When an entry event is detected, the determination means does not determine whether the person who has newly entered the monitoring area is a permitter, but only determines whether the person has entered from the entrance to the site. To do. When the person enters from outside the site entrance, the person is determined to be a suspicious person, and when entering from the site entrance, the determination as to whether or not the person is a suspicious person is suspended and the entry to the entrance area is permitted. Allow only time. In that case, even when a new person is detected in the blind spot by the original person already existing in the entrance area, it is not determined whether each person is a permitted person or a non-permitted person, As the tracking data of the newly detected person, it may be determined again whether or not the newly detected person is a suspicious person. Also in this case, the security system can accurately detect a suspicious person who has not been temporarily detected in a monitoring area because another person is blind spot. 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.

  Further, the determination means of the monitoring terminal may not determine whether or not a non-permitted person has entered from the entrance of the site when the occurrence of an entrance event is detected. In that case, regardless of whether or not a non-permitted person has entered from the entrance of the site, the judging means will allow temporary admission without immediately judging that the person is a suspicious person, and will enter the admission area beyond a predetermined time. A suspicious person is determined when staying. In that case, even when a new person who is in a blind spot is detected by the original person already existing in the entrance area, even if the person enters from outside the site entrance, it is not determined to be a suspicious person, and for a predetermined time It may be determined that the person is a suspicious person if he / she stays in the entrance area.

  In the security system, the regular monitoring area may not be set in the monitoring area. In that case, the entire range of the monitoring area becomes the entrance area.

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 Event detection unit 343 Determination unit

Claims (4)

A security system for monitoring a suspicious person's entry into a surveillance area,
Detecting means for detecting the position of a person existing in the monitoring area;
Position tracking means for recording a position history for each detected person and tracking the person;
Suspicious person judging means for judging whether or not the person is a suspicious person based on the history of the position;
Separation determining means for determining whether or not the newly detected person is a separated person existing in the blind spot of the person being tracked,
When the newly detected person is the separated person, the suspicious person determining means uses the position history recorded with respect to the person being tracked as the position history with respect to the separated person. A security system characterized by retroactively determining whether a person is a suspicious person.   The security system according to claim 1, wherein the separation determination unit determines the separation person when the position of the newly detected person is in the vicinity of the person being tracked.   The security system according to claim 1 or 2, wherein the separation determination unit determines the separation person when the position of the newly detected person is not an edge of the monitoring area. Identification information acquisition means for acquiring identification information of the person;
For each detected person, further comprising authority identifying means for determining authority based on the identification information whether the person is a pre-registered authorized person or a non-permitted person who is not the authorized person,
The suspicious person judging means is
A means for determining a suspicious person by detecting a specific action by the non-permitted person based on the history of the position and the result of the authority determination;
If the newly detected person is determined to be the non-permitted person and the separated person who was in the blind spot of the permitted person being tracked, the history of the position recorded for the permitted person being tracked is displayed. The security system according to any one of claims 1 to 3, wherein the retroactive determination is performed as a history of the position related to the separated person who is the non-permitted person.

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