JP2006115099A - Position detection/imaging system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a position detection/imaging system, which detects the current position of a person to be monitored in facilities such as an amusement park and an exhibition hall based upon a transmitted signal from an ID tag that the person to be monitored carries and displays the person to be monitored on a display device, to securely display the person to be monitored on the display device and also to secure the safety of children. <P>SOLUTION: Once a search reader 60 reads information from the ID tag 8 that a guardian carries, a host computer 64 retrieves a received information DB62, extracts three monitoring readers 10 having read an ID from an ID tag 4 of a child corresponding to the retrieved information, detects the current position of the child corresponding to the information based upon reception intensity values that the three monitoring readers 10 detect together with the ID corresponding to the information and arrangement positions of the three monitoring readers 10, and changes the imaging direction of a camera 30 by a driving section 50 to image the child by the camera 30, thereby displaying video captured by the camera 30 on the display device 6. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a position detection / imaging system for detecting a current position of a monitoring target person who has entered various facilities such as an amusement park, a museum, an exhibition hall, and displaying the monitoring target person at the current position on a display device. About.

  Conventionally, when a child who has entered these facilities has been separated from the guardian (that is, lost) at an amusement park, museum, exhibition hall, etc., the guardian is in the management center of the facility. By reporting this fact, a position detection / imaging system that detects the current position of a child from a management center and displays an image of the current position on a display device is known (for example, see Patent Document 1).

That is, in this system, an ID card for transmitting personal identification information is given to a child who has visited the facility, and at each point in the facility, a reader for reading the identification information from the ID card and each reader And a camera for imaging the periphery of the camera. When a child leaves the parent, the parent reports the name of the child to the management center. On the management center side, the administrator inputs identification information corresponding to the name to the host computer. Thus, the host computer is caused to detect the reader that has read the identification information of the child's ID card, and to execute processing for displaying the video from the camera near the reader on the display device. For this reason, the administrator or the guardian can confirm the child by viewing the video displayed on the display device.
JP 9-61519 A

  However, in the conventional position detection / imaging system, since the position of the reader that has read the identification information is detected as the current position of the child (monitoring person), the child exists within the receivable area of the identification information in the reader. This could be confirmed, but the detailed position could not be detected.

  For this reason, in the conventional system, it may not be possible to display the image of the child on the display device. In this case, the administrator or the guardian may check whether the child is really in the displayed place. could not.

  In the conventional position detection / imaging system, when the guardian reports the child's name to the management center, the management center searches for the child and displays it on the display device. Even if a person who is not related to the child reports the child's name to the management center as if he / she is a guardian, the child is searched for and displayed on the display device.

For this reason, in the conventional system, there is a possibility that it may be misused by a third party, and it has not been possible to sufficiently ensure the safety of the child.
The present invention has been made to solve these problems, and based on a transmission signal from an ID tag possessed by a monitoring target existing in a facility such as an amusement park, a museum, or an exhibition hall, the monitoring target's In a position detection / imaging system that detects a current position and displays a monitoring subject at the detected current position on a display device, the monitoring subject can be reliably displayed on the display device, and a child The purpose is to ensure safety.

  The invention according to claim 1, which has been made to achieve the above object, is based on a transmission signal from an ID tag possessed by a monitoring target person existing in the monitoring area, and the monitoring target person (that is, the monitoring target person possesses it). A position detection / imaging system for detecting a current position of an ID tag), imaging a person to be monitored at the detected current position, and displaying the image on a display unit; In the monitoring area, the direction changing means for changing the imaging direction of the means and the receivable areas of the transmission signal from the ID tag are arranged at a plurality of positions so as to overlap each other, and the transmission signal from the ID tag is received, A plurality of receiving means for reading the identification information contained in the received signal and detecting the received signal strength of the received signal, the identification information from the ID tag received by each receiving means, and the received signal strength at that time Is received from each receiving means, the storage means for storing the obtained received information in the storage means for each receiving means, and a detection command for detecting the current position of a specific monitoring subject is input, An ID possessed by the monitoring subject corresponding to the detection command by determining whether the detection command is valid and searching the storage means when the detection command is valid Three or more receiving means that have read the tag identification information are extracted, and in each of the extracted receiving means, the received signal strength stored together with the identification information corresponding to the detection command and the extracted receiving means arrangement position Based on the position detection means for detecting the current position of the monitoring subject corresponding to the detection command, and when the current position of the monitoring subject corresponding to the detection command is detected by the position detection means, the imaging means And a display control means for causing the direction changing means to change the imaging direction of the imaging means so as to image the corresponding monitoring target person and displaying the video acquired by the imaging means on the display means. Yes.

  In the position detection / imaging system of the present invention configured as described above, when a detection command is input to the position detection unit, the position detection unit first determines whether or not the detection command is valid. . Next, when the position detection unit determines that the detection command is valid, the reception unit reads the identification information of the ID tag possessed by the monitoring target person corresponding to the detection command by searching the storage unit. 3 or more are extracted. Then, the position detecting means detects the current position of the monitoring subject corresponding to the detection command based on the received signal strength of the reception information in each extracted receiving means and the extracted arrangement position of the receiving means.

  When the position detection unit detects the current position of the monitoring subject corresponding to the detection command in this way, the display control unit causes the direction changing unit to capture the image of the monitoring unit so that the imaging unit captures the monitoring subject. The direction is changed, and the video acquired by the imaging unit is displayed on the display unit.

  According to the position detection / imaging system described in claim 1 as described above, the display control unit includes the imaging unit in the direction changing unit so that the imaging unit images the person to be monitored detected by the position detection unit. Since the video acquired by the imaging unit is displayed on the display unit after changing the imaging direction, the person to be monitored can be reliably displayed on the display unit.

  Further, in the position detection / imaging system according to the first aspect of the present invention, the current position of the monitoring target is not detected unless a valid detection command is input to the position detection means, so only the person who has input the valid detection command. Can display the video of the monitored person on the display means, and further prevent the monitored person from being taken away by checking where the monitored person is located by a third party. be able to.

Therefore, sufficient safety of the child can be ensured.
Next, the invention described in claim 2 is the position detection / imaging system according to claim 1, wherein the information of the searcher is obtained from the search ID tag possessed by the searcher permitted to input the detection command. A search reader is provided, and when the searcher's information is read by the search reader, the position detection means determines that a legitimate detection command has been input from the searcher, and the searcher's information read by the search reader The present invention is characterized in that the current position of the monitoring target person corresponding to is detected.

  In such a position detection / imaging system according to claim 2, when the search receiving means receives the transmission signal from the search ID tag, it reads the detection command and outputs it to the position detection means. Since the current position of the monitoring subject corresponding to the detection command is detected, the display control means displays the video of the monitoring subject corresponding to the detection command on the display means.

  According to this, only a searcher possessing a search ID tag (for example, a guardian or a caregiver of a monitoring target person) can display the video of the monitoring target person on the display means, thereby further ensuring the safety of the child. can do.

By the way, when the monitoring area is wide or there are many obstacles in the monitoring area, it is difficult to image the entire monitoring area with only one imaging means.
In this case, in the position detection / imaging system according to claim 1 or 2, it is preferable that the imaging unit and the display control unit are configured as described in claim 3.

  That is, the imaging means is arranged in a plurality so as to capture each area for each of the plurality of areas that divide the monitoring area, and the display control means determines the current position of the monitoring subject corresponding to the detection command by the position detection means. When detected, the imaging means closest to the current position is selected, and the direction changing means changes the imaging direction of the imaging means so that the selected imaging means images the monitoring subject corresponding to the detection command. The video acquired by the selected imaging means is displayed on the display means.

According to this, even when the monitoring area is wide or there are many obstacles in the monitoring area, the entire monitoring area can be imaged.
Next, the invention according to claim 4 is the map data storing map data for displaying the entire monitoring area on the display means in the position detection / imaging system according to any one of claims 1 to 3. The storage means is provided, and the position detection means extracts the identification information transmitted from each ID tag existing in the monitoring area by searching the storage means until a detection command is input. For each piece of identification information, three or more receiving means that read the identification information are extracted, and in each of the extracted receiving means, the received signal strength stored together with the identification information that is the current detection target, and the extracted receiving means And the display control means detects the current position of the monitoring subject corresponding to each identification information by the position detection means, respectively. When displaying, the entire monitoring area is displayed on the display unit based on the map data stored in the map data storage unit, and each of the monitoring units detected by the position detection unit is displayed on the map displayed on the display unit. It is characterized by displaying the current position of the target person.

According to this, it is possible to confirm where all the monitoring target persons in the monitoring area are located from the map of the entire monitoring area displayed on the display means and the current position of each monitoring target person.
For this reason, the searcher (person who is permitted to input the detection command) inputs the detection command to the position detection unit, and sees the video displayed on the display unit. You can immediately check where you are and find the person you want to monitor.

Therefore, according to the position detection / imaging system of the fourth aspect, it is possible to shorten the search time until the person to be monitored is searched.
By the way, the ID tag may be configured such that power for transmitting the identification information is supplied from the outside.

  However, in this case, the position detection / imaging system needs to have a function for supplying power for transmitting identification information to the ID tag, and the system becomes complicated. Further, in this case, since the power for transmitting the identification information has to be supplied to all the ID tags, there is a problem that the power consumption of the present system increases.

  Therefore, the position detection / imaging system according to any one of claims 1 to 4 includes a battery that stores power for transmitting identification information in the ID tag, as described in claim 5, Furthermore, if the ID tag is configured to receive power supplied from the battery and transmit the identification information at a timing different from that of other ID tags, a function for supplying the ID tag with power for transmitting the identification information. This system can be simplified and power consumption can be reduced.

  Here, in the position detection / imaging system according to claim 5, if the ID tag is configured to periodically transmit identification information as described in claim 6, the configuration of this system is changed. Can be simple.

  In other words, the ID tag receives an external signal (transmission command), and transmits identification information according to the signal, and periodically transmits the identification information without receiving an external signal. There is something to do. When the former ID tag is used, the system needs to have a function for sending a transmission command to the ID tag, but when the latter ID tag is used (that is, claim 5). Since the ID tag periodically transmits identification information, the present system does not need to have a function of sending a transmission command to the ID tag. Therefore, the configuration of the present system can be simplified.

Hereinafter, a position detection / imaging system (hereinafter also simply referred to as a position detection system) according to an embodiment to which the present invention is applied will be described with reference to the drawings.
First, FIG. 1 is a schematic configuration diagram showing the configuration of the entire position detection system of the first embodiment.

  As shown in FIG. 1, the position detection / imaging system of the first embodiment is transmitted from an ID tag 4 possessed by a plurality of children (monitoring subjects) playing in an indoor facility 2 such as an exhibition hall. Based on the signal, the current position of the child is detected, and the child at the detected current position is displayed on the display device 6, and the transmission signal from the ID tag 4 is received and included in the signal. A plurality of monitoring readers 10a to 10p that read identification information (ID) and detect the electric field strength of the received signal, a camera 30 that images the inside of the facility 2, and motors (see FIG. 4) 38 and 42 described later are driven. By receiving the transmission signal from the ID tag 8 carried by the driving unit 50 that changes the imaging direction of the camera 30 and the guardian of the child (specifically, the child who owns the ID tag 4), Information contained in the signal Each of the monitoring readers 60, the ID from the ID tag 4 received by each of the monitoring readers 10a to 10p, and the received intensity value indicating the electric field strength of the signal. A reception information database (reception information DB) 62 for registering every 10a to 10p and a host computer 64 are provided.

  The camera 30 and the drive unit 50 are connected to the host computer 64 via an interface (I / F). Further, in the following description, when the positional relationship between the monitoring readers 10a to 10p is not particularly distinguished, a symbol obtained by deleting the alphabetic suffixes a to p is used. That is, the monitoring readers 10 a to 10 p are monitoring readers 10.

  As shown in FIG. 2, the monitoring reader 10 includes an antenna 12 for receiving a transmission signal from the ID tag 4 and a band pass filter that allows a signal in a predetermined frequency band (that is, a transmission signal from the ID tag 4) to pass therethrough. (BPF) 14, amplification circuit 16 that amplifies the signal that has passed through BPF 14, demodulation circuit 18 that demodulates the signal amplified by amplification circuit 16 and restores the ID included in the signal, and BPF 14 A level detection circuit 20 that detects the electric field strength of the signal, and an A / D converter 22 that A / D converts the electric field strength detected by the level detection circuit 20 and outputs a received strength value representing the A / D conversion value. And a microcomputer 24 having a communication function.

Further, the microcomputer 24 receives the ID restored by the demodulation circuit 18 and the reception intensity value output by the A / D converter 22.
The monitoring reader 10 having such a configuration stores received data (ID and received intensity value) acquired by receiving from the ID tag 4 together with the current time, for example, in the RAM of the microcomputer 24. Further, the monitoring reader 10 deletes the received data stored in the RAM, which has been received for a predetermined time since the reception (specifically, from the time when the received data was stored).

That is, the RAM 24 of the microcomputer 24 stores the latest received data for which a predetermined time has not elapsed since reception.
The time for which the RAM of the microcomputer 24 holds the received data is, for example, the maximum transmission cycle in which the ID tag 4 transmits a transmission signal, or a slightly longer time.

  The monitoring reader 10 is connected to the network 28 and transmits the received data stored in the RAM to the host computer 64 in response to a communication command from the host computer 64 also connected to the network 28. However, if the received data is not stored in the RAM, an end code indicating that the received data is not acquired is output.

  In addition, each monitoring reader 10 is attached to the ceiling of the facility 2 at a predetermined interval so that the receivable areas of transmission signals from the ID tag 4 overlap each other. Specifically, in this embodiment, as shown in FIG. 3, at least three of the monitoring readers 10 receive transmission signals from the ID tags 4 existing in the facility 2.

  That is, in each of the monitoring readers 10, at least three of the monitoring readers 10 are always transmission regions for transmission signals from the ID tag 4 (the portion indicated by the one-dot chain line in FIG. 2; in this embodiment, the radius is 7 m. Degree).

  Note that the ID tag 4 has a function of receiving an electric power supply from a battery built in in advance and periodically transmitting an identification signal so that information can be read without contact on the monitoring reader 10 side. RFID tags are used. And each ID tag 4 is comprised so that the transmission timing of a transmission signal may mutually differ. In the present embodiment, when the child enters the facility 2, the ID tag 4 is handed over from the employee of the facility 2 to the child's guardian and attached to a part of the child's body (for example, a foot). It is done.

  Next, the mounting state of the camera 30 will be described with reference to FIG. 4A and 4B are explanatory views for explaining the mounting state of the camera 30, FIG. 4A is a side view thereof, and FIG. 4B is a plan view.

  First, a ceiling installation box 32 is attached to the center portion of the ceiling of the facility 2. As shown in FIG. 4A, the ceiling installation box 32 has a part of a first rotating shaft 36 that supports a camera storage box 34 for storing the camera 30 so as to be rotatable in the horizontal direction with respect to the ceiling. It is stored.

  More specifically, a gear 36 a is attached to the first rotating shaft 36, and the ceiling side portion including the gear 36 a of the first rotating shaft 36 is accommodated in the ceiling installation box 32. ing.

  A motor 38 is fixed in the ceiling installation box 32, and a rotating shaft 38a of the motor 38 rotates in a horizontal direction with respect to the ceiling. The gear 38 b attached to the rotation shaft 38 a of the motor 38 is in mesh with the gear 36 a of the first rotation shaft 36.

Therefore, when the motor 38 rotates, the first rotating shaft 36 rotates in the horizontal direction, and the camera storage box 34 (that is, the camera 30) also rotates in the horizontal direction.
On the other hand, as shown in FIG. 4B, the camera 30 in the camera storage box 34 is attached with a second rotating shaft 40 that rotates the camera 30 in the vertical (up and down) direction with respect to the ceiling. A gear 40 a is attached to the second rotating shaft 40.

  Further, a motor 42 is fixed in the camera storage box 34, and a rotating shaft 42a of the motor 42 rotates in a direction perpendicular to the ceiling. The gear 42 b attached to the rotation shaft 42 a of the motor 42 is in mesh with the gear 40 a of the second rotation shaft 40.

For this reason, when the motor 42 rotates, the second rotating shaft 40 rotates in the vertical direction, and the camera 30 also rotates in the vertical direction.
The search reader 60 is for reading the information stored in the ID tag 8 from the ID tag 8 possessed by the guardian. In this embodiment, the information is read from the ID tag 8 several tens of centimeters away. Something that can be read is used.

  Note that the ID tag 8 has an RFID function that is activated by wireless transmission power from the search reader 60 and wirelessly transmits a transmission signal so that information can be read without contact on the search reader 60 side. Tags are used. In the present embodiment, the information stored in the ID tag 8 is the same as the ID of the ID tag 4 possessed by the child. The ID tag 8 is handed over from the employee of the facility 2 to the guardian of the child together with the ID tag 4 to be carried by the child.

  The search reader 60 is disposed at the entrance of the facility 2 together with the display device 6, for example. The search reader 60 periodically transmits an activation signal for activation of the ID tag 8, receives the activation signal, receives a transmission signal from the activated ID tag 8, and reads the information. The information is output to the host computer 64.

  The host computer 64 periodically transmits a communication command to each monitoring reader 10, whereby the ID and received intensity value from the ID tag 4 received by each monitoring reader 10 are monitored via the network 28. Obtained from the reader 10 and the obtained received data (ID and received intensity value) are stored in the received information DB 62 for each monitoring reader 10.

  In addition, when the information read by the search reader 60 is input, the host computer 64 searches the received information DB 62 for an ID that matches the input information, and reads the ID that matches the input information to the monitoring reader 10. The child who possesses the ID tag storing the ID based on the received intensity value and the received intensity value and the arrangement position of the monitoring reader 10 that has read the received intensity value. Detect the current position of.

  Further, when the host computer 64 detects the current position of the child carrying the ID tag 4, the drive unit sends a command signal for causing the drive unit 50 to drive the motors 38 and 42 so that the camera 30 images the child. 50, a magnification adjustment signal for adjusting the magnification of the camera 30 is output to the camera 30, and video data acquired by the camera 30 is output to the display device 6. Display the image to be captured.

  Next, processing performed by the position detection system according to the first embodiment will be described with reference to the flowcharts of FIGS. FIG. 5 is a flowchart showing a reception status monitoring process executed by the microcomputer 24 of the monitoring reader 10 to receive a transmission signal from the ID tag 4 and output the received data to the host computer 64. . FIG. 6 is a flowchart showing a received data storage process executed by the host computer 64 to store received data acquired from the monitoring reader 10 in the received information DB 62. FIG. 7 shows the position detection executed by the host computer 64 to display the current position of the child on the display device 6 based on the information from the search reader 60 and the received data registered in the received information DB 62. -It is a flowchart showing an imaging process.

First, the monitoring process will be described.
When the microcomputer 24 of the monitoring reader 10 executes the reception status monitoring process shown in FIG. 5, it is first determined at step 110 (hereinafter, step is referred to as S) whether or not a communication command has been received from the host computer 64.

  If it is determined in S110 that a communication command has not been received from the host computer 64 (S110: NO), the process proceeds to S120, and it is determined whether a transmission signal from the ID tag 4 has been received.

  If it is determined in S120 that the signal from the ID tag 4 has been received (S120: YES), the process proceeds to S130, and when the signal is received, the demodulation circuit 18 and the A / D converter 22 The received data obtained from the above is stored in the RAM together with the current time, and the process proceeds to S140.

On the other hand, when it is determined that the signal from the ID tag 4 has not been received (S120: NO), the process proceeds to S140 as it is.
Then, in S140, of the received data stored in the RAM, only the received data that has passed for a predetermined time since it was received (specifically from the time when the received data was stored) is deleted, and the process returns to S110.

  On the other hand, if it is determined in S110 that a communication command has been received from the host computer 64 (S110: YES), the process proceeds to S150, where it is determined whether received data is stored in the RAM.

  If it is determined in S150 that the received data is stored in the RAM (S150: YES), the process proceeds to S160, where the received data is output to the host computer 64, and the process returns to S110.

  On the other hand, if it is determined in S150 that the received data is not stored in the RAM (S150: NO), the process proceeds to S170, an end code is output to the host computer 64, and the process returns to S110.

Next, received data storage processing performed by the host computer 64 will be described.
When the host computer 64 starts the received data storage process shown in FIG. 6, first, “1” is substituted into the monitoring reader selection value n in S210. The monitoring reader selection value n represents which monitoring reader 10 is selected from among the monitoring readers 10 existing in the facility 2 and is stored in the RAM of the host computer 64, for example.

  Here, in this embodiment, the order of numerical values substituted for the monitoring reader selection value n corresponds to the alphabetical order assigned to the monitoring reader 10. That is, the host computer 64 indicates the monitoring reader 10a when the value of the monitoring reader selection value n is “1”, and indicates the monitoring reader 10b when the value of the monitoring reader selection value n is “2”. When the value of the monitoring reader selection value n is “16”, the monitoring reader 10p is indicated.

When the process of S210 is completed, a communication command is transmitted to the monitoring reader 10 corresponding to the monitoring reader selection value n in the subsequent S220.
Then, the monitoring reader 10 that has received the communication command transmits received data or an end code to the host computer 64 as described above.

In S230, received data or an end code is acquired from the monitoring reader 10 (ie, the nth monitoring reader) to be communicated.
In S240, the reception data corresponding to the monitoring reader 10 to be communicated is updated among the reception data registered in the reception information DB 62.

Then, in S250, it is determined whether or not the value of the monitoring reader selection value n is “16 (the total number of monitoring readers 10, which is 16 in this embodiment)”.
If it is determined in S250 that the value of the monitoring reader selection value n is not “16” (S250: NO), the process proceeds to S260, and the value of the monitoring reader selection value n is set to “1”. In addition, the process returns to S220.

On the other hand, if it is determined in S250 that the value of the monitoring reader selection value n is “16” (S250: YES), the process returns to S210.
Therefore, in the reception information DB 62, the reception status of each monitoring reader 10 is updated and stored as needed.

Next, position detection / imaging processing performed by the host computer 64 will be described.
When the host computer 64 starts the position detection / imaging process shown in FIG. 7, first, in S310, it waits until information is input from the search reader 60. When information is input from the search reader 60 (S310: YES). ), Go to S320.

  In S320, the received information DB 62 is searched for an ID that matches the information input from the search reader 60, and in the subsequent S330, the higher rank is selected from the received intensity values read by the monitoring reader 10 together with the matched ID. Three are extracted.

  Then, in S340, the ratio of the three extracted reception intensity values is calculated, and in S350, the search target is based on the ratio and the arrangement position of the monitoring reader 10 that has read the extracted reception intensity value. The current position of the child carrying the ID tag 4 storing the ID is detected.

  In S360, based on the detected current position of the child and the direction in which the camera 30 is currently capturing, the control amount for moving the motors 38 and 42 so that the camera 30 captures the child and The magnification of the camera 30 is calculated.

  In S370, a command signal corresponding to the control amount calculated in the process of S360 is output to the drive unit 50, and a magnification adjustment signal corresponding to the magnification of the camera 30 is output to the camera 30.

Then, the drive unit 50 drives the motors 38 and 42 and the camera 30 performs zoom adjustment, and the detected child is imaged by the camera 30.
In step S380, the video data acquired by the camera 30 is output to the display device 6.

Then, the display device 6 displays an image captured by the camera 30 (that is, a detected child image).
Subsequently, in S390, when a predetermined time has elapsed from the process of S380, the output of the video data to the display device 6 is stopped.

Then, the video from the camera 30 is not displayed on the display device 6.
Then, when the process of S390 is completed, the process returns to S310.
As described above, in the position detection system of the first embodiment, the reception data from each monitoring reader 10 is periodically stored in the reception information DB 62.

  Further, when a guardian searches for a child, if the information of the ID tag 8 owned by the guardian is read by the search reader 60, the position detection system uses the ID tag 4 storing the ID that matches the information. The child's current position is detected and the child is displayed on the display device 6, and the guardian can confirm the child by viewing the video displayed on the display device 6.

  According to the position detection system of the first embodiment as described above, the drive unit 50 is driven by the motors 38 and 42 so that the camera 30 captures an image of the child detected by the host computer 64. Since the image acquired by the camera 30 is displayed on the display device 6 after the imaging direction is changed and the magnification of the camera 30 is adjusted, the child searched by the guardian can be reliably displayed on the display device 6. it can.

  Further, according to the position detection system of the first embodiment, only the guardian who has the ID tag 8 causes the display device 6 to display the image of the child who has the ID tag 4 corresponding to the ID tag 8. Can do. For this reason, it is possible to prevent a third party from examining where the child is and taking the child away. Therefore, sufficient safety of the child can be ensured.

  Further, according to the position detection system of the first embodiment, when detecting the position of the child, the ratio of the top three received intensity values and the arrangement position of the monitoring reader 10 that acquired the received intensity value are used. Since the position is detected based on this, the position can be detected more accurately.

  In addition, the ID tag 4 possessed by the child is configured to periodically transmit an identification signal without receiving a signal from the outside, so it is not necessary to have a function of transmitting a signal from the outside, The configuration of this system can be simplified.

  In the first embodiment, the facility 2 corresponds to the monitoring area, and the display device 6 corresponds to the display means. The camera 30 corresponds to an imaging unit, the motors 38 and 42 and the drive unit 50 correspond to a direction changing unit, the monitoring reader 10 corresponds to a receiving unit, and the reception information DB 62 corresponds to a storage unit. 6 corresponds to the storage means, S310 to S350 of the position detection / imaging process of FIG. 7 correspond to the position detection means, and S360 to S370 correspond to the display control means.

  Next, a position detection system according to the second embodiment will be described. In the position detection system of the second embodiment, the same reference numerals are given to the same configurations as those of the position detection / imaging system of the first embodiment, and detailed description thereof is omitted.

First, the position detection / imaging system of the second embodiment differs from the position detection / imaging system of the first embodiment in the following points.
First, map data representing the entire facility 2 is stored in the host computer 64 of the second embodiment.

In addition, the host computer 64 of the second embodiment performs the all monitoring target person search process of FIG. 8 for displaying on the display device 6 where all the children in the facility 2 are currently located.
More specifically, when the host computer 64 starts the all-monitoring target person search process, first, map data is read in S410, and the map data is output to the display device 6 in subsequent S420. Then, the display device 6 displays a map that represents the entire facility 2.

In S430, the ID is extracted by searching the reception information DB 62, and one of the extracted IDs is selected in subsequent S440.
In S450, the top three are selected from the received intensity values read by the monitoring reader 10 together with the selected ID.

  In S460, the ratio of the three received reception intensity values is calculated. In S470, the ratio is selected based on the ratio and the arrangement position of the monitoring reader 10 that has read the extracted reception intensity value. The current position of the child carrying the ID tag 4 storing the ID is detected.

  In S480, the detected current position is displayed on the map displayed on the display device 6. In the present embodiment, the ID of the ID tag possessed by the child is displayed on the display device 6 near the current position of the child displayed on the display device 6 in the process of S480.

  Then, in S490, it is determined whether or not all the IDs extracted in the process of S430 are selected. If it is determined that all the extracted IDs are not selected (S490: NO), the process proceeds to S500, and the extraction is performed. One ID that has not been selected is selected from the selected IDs, and the process proceeds to S450.

On the other hand, if it is determined in S490 that all extracted IDs have been selected (S490: YES), the process returns to S430.
For this reason, as shown in FIG. 9, the current position of all the children playing in the facility 2 (5 people in the present embodiment) and the corresponding IDs are collectively displayed on the display device 6.

  Further, as shown in FIG. 10, the host computer 64 of the second embodiment performs the processes of S375, S385, and S395 instead of the processes of S380 and S390 of the position detection / imaging process.

  That is, in the position detection / imaging process of the second embodiment, when the process of S370 is finished, the process proceeds to S375, the output of the map data displayed on the display device 6 and the output of the position signal are stopped, and the camera The image data from 30 is prioritized and displayed on the display device 6 (the display mode is switched to the image from the camera 30). In step S385, the video data from the camera 30 is displayed on the display device 6 until it is determined that the predetermined time has elapsed. Then, in S385, it is determined that a predetermined time has passed (S385: YES), the process proceeds to S395, the display of the video data from the camera 30 on the display device 6 is stopped, and the map data and all the monitoring targets are again displayed. The current position of the child detected in the person search process is displayed on the display device 6 together with the corresponding ID (the display mode is switched to the facility overall view).

  As described above, in the position detection system of the second embodiment, when the search reader 60 reads the information of the ID tag 8 possessed by the guardian, the child image corresponding to the ID tag 8 is displayed. The point displayed on the device 6 is the same as in the first embodiment, but when the current position of the child is not displayed on the display device 6, the current position of all the children playing in the facility 2 and the corresponding ID are displayed. The information is collectively displayed on the device 6.

For this reason, it is possible to confirm where all the children in the facility 2 are from the map of the entire facility 2 displayed on the display device 6 and the current position of each child.
Further, when the current position detection system collectively displays the current positions of all the children on the display device 6, as shown in FIG. 9, the display device 6 displays the current positions of all the children and the IDs corresponding thereto. Is displayed so that the privacy of the child can be protected and the safety of the child can be ensured. Only the person who knows the ID of the child (ie, the guardian) confirms the current position of the child. can do.

  For this reason, the guardian can immediately confirm the child's whereabouts from the child ID displayed on the display device 6, can search for the child, and can search for the child until the child is searched. It can be shortened.

  In addition, when the position detection system collectively displays the current positions of all the children on the display device 6, the guardian searches for the ID tag 8 possessed by the guardian if he / she wants to confirm the whereabouts of the child. The video of the child displayed on the display device 6 can be confirmed by holding it over the reader 60.

As mentioned above, although one Embodiment of this invention was described, it cannot be overemphasized that this invention can take a various form.
In the present embodiment, the position detection and imaging are performed in the facility 2 that is indoors. However, the present invention is not limited to this, and it may be performed in an outdoor facility. In this case, the monitoring reader 10 may be embedded in the ground or the floor, or a pillar to which the monitoring reader 10 is attached may be disposed in the facility area.

  Further, a plurality of cameras 30 may be arranged so that each region is imaged for each of a plurality of regions dividing the facility 2. In this case, the host computer 64 performs a process of selecting the camera 30 closest to the current position detected in S350 after the process of S350, and displays the video data acquired by the camera 30 in S380. 6 may be configured to output to 6.

  According to this, even when the facility 2 is in a wide range or there are many obstacles in the facility 2, the entire facility 2 can be imaged.

It is a schematic block diagram showing the structure of the whole position detection and imaging system of embodiment. It is a block diagram showing the structure of the monitoring reader | leader. It is explanatory drawing explaining the arrangement | positioning relationship of the monitoring reader | leader. It is explanatory drawing explaining the attachment state of a camera. It is a flowchart showing the reception condition monitoring process performed with the microcomputer of the monitoring reader. It is a flowchart showing the reception data storage process performed with the host computer of 1st Embodiment. It is a flowchart showing the position detection and imaging process performed with the host computer of 1st Embodiment. It is a flowchart showing all the monitoring subject search processes performed with the host computer of 2nd Embodiment. It is explanatory drawing explaining the state of the screen displayed on a display apparatus by all the monitoring subject search processing. It is a flowchart showing the position detection and imaging process performed with the host computer of 2nd Embodiment.

Explanation of symbols

  2 ... Facility, 4, 8 ... ID tag, 6 ... Display device, 10a to 10p ... Monitoring reader, 30 ... Camera, 38, 42 ... Motor, 50 ... Drive unit, 60 ... Search reader, 62 ... Reception information DB 64: Host computer.

Claims (6)

Based on a transmission signal from an ID tag possessed by a monitoring target person existing in the monitoring area, the current position of the monitoring target person is detected, and the monitoring target person at the detected current position is imaged and displayed on the display means. A position detection / imaging system that
Imaging means for imaging the inside of the monitoring area;
Direction changing means for changing the imaging direction of the imaging means;
Within the monitoring area, a plurality of receivable areas of the transmission signal from the ID tag are arranged at a plurality of locations, receive the transmission signal from the ID tag, and identify information included in the reception signal. A plurality of receiving means for reading and detecting the received signal strength of the received signal;
Storage means for acquiring the identification information from the ID tag received by each receiving means and the received signal strength at that time from each receiving means, and storing the acquired received information in the storage means for each receiving means; ,
When a detection command for detecting the current position of a specific monitoring subject is input, it is determined whether or not the detection command is valid, and when the detection command is valid, By searching the storage means, three or more receiving means that read the identification information of the ID tag possessed by the monitoring subject corresponding to the detection instruction are extracted, and each of the extracted receiving means includes the detection instruction. Position detection means for detecting the current position of the monitoring subject corresponding to the detection command based on the received signal strength stored together with the corresponding identification information and the arrangement position of the extracted receiving means;
When the current position of the monitoring subject corresponding to the detection command is detected by the position detection means, the imaging means is connected to the direction changing means so that the imaging means images the monitoring subject corresponding to the detection command. Display control means for causing the display means to display the video acquired by the imaging means,
A position detection / imaging system characterized by comprising: A search reader for reading the searcher information from a search ID tag possessed by a searcher permitted to input the detection command;
When the searcher's information is read by the search reader, the position detecting means determines that a valid detection command is input from the searcher, and the searcher's information is read by the search reader. Detecting the current location of the corresponding monitored person,
The position detection / imaging system according to claim 1. A plurality of the imaging means are arranged so as to image each area for each of a plurality of areas that divide the monitoring area,
When the current position of the monitoring subject corresponding to the detection command is detected by the position detection unit, the display control unit selects an imaging unit closest to the current position, and the selected imaging unit selects the detection command. So that the direction changing means changes the imaging direction of the imaging means so as to image the monitoring target person corresponding to the image, and the video acquired by the selected imaging means is displayed on the display means,
The position detection / imaging system according to claim 1 or 2. Comprising map data storage means for storing map data for displaying the entire monitoring area on the display means;
The position detection means extracts the identification information transmitted from each ID tag existing in the monitoring area by searching the storage means until the detection command is input, For each piece of identification information, three or more receiving means that read the identification information are extracted, and in each of the extracted receiving means, the received signal strength stored together with the identification information that is the current detection target, and the extracted receiving means And the current position of the monitoring subject corresponding to each of the identification information, respectively,
The display control means, when the position detection means detects the current position of the monitoring subject corresponding to each identification information, based on the map data stored in the map data storage means, Displaying the whole on the display means, and further displaying the current position of each monitoring subject detected by the position detection means on the map displayed on the display means,
The position detection / imaging system according to any one of claims 1 to 3. The ID tag has a built-in battery that stores power for transmitting the identification information, and the ID tag receives power from the battery and has a timing different from that of other ID tags. Sending identification information,
The position detection / imaging system according to any one of claims 1 to 4, wherein The ID tag periodically transmits the identification information;
The position detection / imaging system according to claim 5.

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