JP2009288061A - Monitoring device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a monitoring device for outputting accurate alarm in response to a situation. <P>SOLUTION: The monitoring device for monitoring management object articles (100) based on management article wireless communication tags (200) and manager wireless communication tags (300) includes: first detection means (16, 34) for detecting existence of management object articles based on the management article wireless communication tags; second detection means (16, 34) for detecting existence of managers based on the manager wireless communication tags; a specifying means (34e) for specifying values corresponding to change amounts of positions of the management object articles based on radio waves from the management article wireless communication tags; a clocking means (27) for measuring times in response to change amounts; and control means (16, 36, 28e) for outputting alarms in response to at least one of a detection result of the first detection means, a detection result of the second detection means, a specifying result of the specifying result, and a clocking result of the clocking means. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a monitoring device, and more particularly to, for example, a monitoring device that monitors a management target product based on a wireless communication tag (RFID) attached to the management target product and a wireless communication tag carried by an administrator.

An example of this type of monitoring device is disclosed in Patent Document 1. In the article management system described in Patent Document 1, the managed article placed at the reference position is monitored based on the wireless communication tag attached to the managed article and the wireless communication tag carried by the management subject. In this managed article system, when the managed article exists outside the predetermined range from the reference position, if the wireless communication tag of the management subject is not detected, it is determined that the managed article is erroneously moved by a person other than the management subject. The buzzer is sounded. However, when the wireless communication tag of the management subject is detected, it is determined that the managed subject is normally carried out and the buzzer is not sounded.
JP 2007-065950 [G08B 13/14, G06Q 50/00, G06Q 10/00, G06K 17/00, G01S 5/12]

  As described above, in the article management system disclosed in Patent Document 1, even if the managed article is away from the reference position, there is no problem when there is a person to be managed.

  Therefore, if the managed article is an art piece in a museum and the museum member who is the subject of management forgets to return the managed article that must be returned to the reference position within a predetermined time, this is detected and notified. There is a problem that can not be.

  Further, in the article management system disclosed in Patent Document 1, even when the managed article is located outside the predetermined range from the reference position, there is no problem if the position of the managed article does not change.

  Therefore, if the position of the artwork as the managed article returned after the management subject has moved once for maintenance is shifted from the reference position, or if the artwork is damaged by someone and left in the vicinity, There is a problem in that it cannot be detected and notified when the position is shifted.

  Therefore, the main object of the present invention is to provide a novel monitoring device.

  Another object of the present invention is to manage products in consideration of the presence / absence of management versus products, the presence / absence of managers, the amount of movement of managed products, and the time that the managed products are moving. It is an object of the present invention to provide a monitoring device capable of outputting an accurate alarm according to the situation surrounding the.

  1st invention is the monitoring apparatus which monitors a management object goods based on the management goods radio communication tag attached to the management object goods which should be arrange | positioned at a fixed position, and the administrator radio communication tag carried by the administrator. Management based on radio waves from the managed product wireless communication tag received by the receiving means, receiving means for receiving radio waves from the managed product wireless communication tag and the manager wireless communication tag via the antenna having directivity First detection means for detecting the presence of the target product, second detection means for detecting the presence of the manager based on a radio wave from the administrator wireless communication tag received by the receiving means, and a managed product wireless communication tag received by the receiving means Specifying means for specifying a value corresponding to the amount of change in the position of the management target product from a fixed position based on the radio wave from the time, a time measuring means for measuring time according to the change amount specified by the specifying means, and a first detecting means Detection result , The detection result of the second detecting means, a specific result of a specific means, and a control means for outputting a warning based on at least one of the timing result timekeeping means is a monitoring device.

  In the first invention, the monitoring device (10) includes a managed product wireless communication tag (200) attached to the managed product (100) to be placed at a fixed position and a manager carried by the manager (S). Based on the wireless communication tag (300), the management target product is monitored. The antenna (34d) has directivity, and the receiving means (34c) receives radio waves from the managed product wireless communication tag and the administrator wireless communication tag via the antenna, and the first detecting means (16, 34a). Detects the presence of the management target product based on the radio wave from the managed product wireless communication tag received by the receiving means, and the second detecting means (16, 34a) detects the radio wave from the manager wireless communication tag received by the receiving means. Based on the radio wave from the managed product wireless communication tag received by the receiving means, the identification means (16, 34e) detects the presence of the manager based on the value of the change amount of the managed product from the fixed position based on the radio wave The time measuring means (27) measures the time according to the change amount specified by the specifying means, and the control means (16, 36, 28e) is the detection result of the first detecting means, the detection of the second detecting means. Result, identification result of identification means And it outputs an alarm based on at least one of the timing result counting means.

  According to the first invention, the management target product is surrounded in consideration of the presence / absence of management versus the product, the presence / absence of the manager, the movement amount of the management target product, and the time during which the management target product is moving. An accurate alarm according to the situation can be output.

  The second invention is an invention subordinate to the first invention, and the control means includes first output means for outputting a first alarm when the first detection means does not detect the presence of the management target product. .

  In the second invention, the control means includes first output means (16, 36, 28e) for outputting a first alarm when the first detection means does not detect the presence of the management target product.

  According to the second invention, when the presence of the management target product is not detected and there is a possibility that the management target product has been stolen, it is possible to output a warning to that effect.

  The third invention is an invention subordinate to the first invention or the second invention, and the control means detects the presence of the management target product by the first detection means, and the second detection means is the presence of the manager. Is not detected, and further includes a second output means for outputting a second alarm when the change amount specified by the specifying means is equal to or greater than the first threshold.

  In the third invention, in the control means, the first detection means detects the presence of the management target product, the second detection means does not detect the presence of the manager, and the change amount specified by the specifying means is the first change amount. A second output means (16, 36, 28e) for outputting a second alarm when the threshold value is exceeded is included.

  According to the third invention, there is a possibility that there is a management target product, but there is no manager, the movement amount of the management target product exceeds the first threshold, and the management target product may be damaged. In addition, an alarm to that effect can be output.

  The fourth invention is an invention subordinate to the third invention, wherein the control means detects the presence of the management target product by the first detection means and continues to detect the presence of the manager by the second detection means. A third output that outputs a third alarm when a predetermined amount of time has elapsed for which the amount of change specified by the specifying means that is timed by the time measuring means continues to be equal to or greater than the second threshold value that is greater than the first threshold value. Including means.

  In the fourth invention, the control means specifies the specifying means that is timed by the time measuring means while the first detecting means detects the presence of the management target product and the second detecting means continues to detect the presence of the manager. A third output means (16, 28e) for outputting a third alarm when a predetermined amount of time has elapsed when the amount of change to be continued is equal to or greater than a second threshold value that is greater than the first threshold value;

  According to the fourth aspect of the present invention, when there is a possibility that the manager can move the product to be managed, it is possible to output a warning to that effect.

  The fifth invention is an invention subordinate to the fourth invention, wherein the control means detects while the first detection means detects the presence of the management target product and the second detection means continues to detect the manager. After the amount of change specified by the specifying unit once becomes equal to or greater than the second threshold value, the fourth output unit outputs a fourth alarm when it is smaller than the second threshold value but larger than the first threshold value.

  In the fifth invention, the control means detects the amount of change to be specified by the specifying means while the first detecting means detects the presence of the management target product and the second detecting means continues to detect the manager. After the above, it includes a fourth output means (16, 28e) for outputting a fourth alarm when it is smaller than the second threshold but larger than the first threshold.

  According to the fifth invention, while the management target item exists and the manager continues to exist, the movement amount of the management target item once becomes equal to or larger than the second threshold value and then becomes smaller than the second threshold value. When there is a possibility that the product to be managed is larger than the threshold value and deviated from the fixed position, an alarm to that effect can be output.

  The sixth invention is an invention subordinate to the fourth invention or the fifth invention, wherein the control means detects the presence of the management target product by the first detection means and the presence of the administrator by the second detection means. The amount of change specified by the specifying means when detecting is greater than or equal to the second threshold, but the amount of change specified by the specifying means when the second detecting means no longer detects the presence of the administrator is greater than or equal to the first threshold. In some cases, fifth output means for outputting a fifth alarm is included.

  In the sixth invention, the control means detects the presence of the management target product by the first detection means, and the change amount specified by the specification means when the second detection means detects the presence of the manager is greater than or equal to the second threshold value. The fifth output means (16, 5) that outputs a fifth alarm when the change amount specified by the specifying means is equal to or more than the first threshold when the second detecting means no longer detects the presence of the manager. 28e).

  According to the sixth invention, when the management target item exists and the manager exists, the movement amount of the management target item is equal to or greater than the second threshold value, but the management target is not managed when the manager no longer exists. When the amount of movement of the product is above the first threshold and there is a possibility that the administrator has forgotten to return the managed product to the home position, an alarm can be output to that effect.

  According to a seventh aspect of the present invention, there is provided a managed product wireless communication tag in which an operation method attached to a management target product to be placed at a fixed position can be switched between an active method and a passive method, and an administrator wireless communication tag carried by an administrator. A monitoring device for monitoring a management target product based on an imaging means for capturing an optical image of an object scene, a directional antenna, an administrator wireless communication tag and a management product wireless communication tag via the antenna Receiving means for receiving the radio wave, imaging means and turning means for turning the antenna, first detecting means for detecting the presence of the management target product based on the radio wave received by the receiving means from the managed product wireless communication tag, and receiving means for managing Second detection means for detecting the presence of the manager based on the radio wave received from the person wireless communication tag, and the managed product based on the radio wave from the management article wireless communication tag received by the receiving means. Identification means for identifying a value corresponding to the amount of change in position from the position, timing means for measuring time according to the amount of change identified by the identification means, an image captured by the imaging means, and an administrator received by the receiving means Tracking means for controlling the turning means based on the radio wave from the radio communication tag and / or the radio wave from the managed product radio communication tag to track the moving object in the field of the imaging means, and the operation method of the managed product radio communication tag Based on at least one of the switching means for switching between the active method and the passive method, the detection result of the first detection means, the detection result of the second detection means, the specification result of the specification means, and the time measurement result of the time measurement means A monitoring device comprising control means for outputting and executing at least one of tracking by the tracking means and switching by the switching means.

  In the seventh invention, the monitoring device (10) is a managed product wireless communication tag (200) in which an operation method attached to a managed product (100) to be placed at a fixed position can be switched between an active method and a passive method. ) And the administrator wireless communication tag (300) carried by the administrator (S) to monitor the management target product. The imaging means (12, 14) picks up an optical image of the object scene, the antenna (34d) has directivity, and the receiving means (34c) receives the administrator wireless communication tag and the managed product wireless via the antenna. The radio wave from the communication tag is received, the turning means (30, 32) turns the imaging means and the antenna, and the first detection means (16, 34a) is based on the radio wave received from the managed product wireless communication tag by the receiving means. The second detection means (16, 34a) detects the presence of the manager based on the radio wave received from the manager wireless communication tag by the receiving means, and the specifying means (16, 34e) Based on the radio wave from the managed product wireless communication tag received by the receiving means, a value corresponding to the amount of change in the position of the managed product from the fixed position is specified, and the time measuring means (27) sets the change amount specified by the specifying means. Measure the time accordingly and add The means (16) controls the turning means on the basis of the image picked up by the image pickup means and the radio wave received from the manager radio communication tag and / or the radio wave from the managed product radio communication tag received by the receiving means. The moving means in the object field is tracked, the switching means (16, 28c) switches the operation mode of the managed product wireless communication tag between the active method and the passive method, and the control means (16) is the detection result of the first detecting means. Based on at least one of the detection result of the second detection means, the specification result of the specification means, and the time measurement result of the time measurement means, an alarm is output and at least one of tracking by the tracking means and switching by the switching means is executed. .

  According to the seventh aspect, the management target product is surrounded in consideration of the presence / absence of the management target product, the presence / absence of the manager, the movement amount of the management target product, and the time during which the management target product is moving. It is possible to output an accurate alarm according to the situation, and to switch between a passive method and an active method for tracking the moving object in the object scene and operating the managed product wireless communication tag.

  According to the present invention, an accurate alarm corresponding to the situation surrounding the management target product is output in consideration of the movement amount of the management target product, the presence / absence of the manager, and the time during which the management target product is moving. be able to.

  The above object, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

<First Embodiment>
Referring to FIG. 1, for example, in monitoring apparatus 10 of this embodiment, for example, in a museum, only one unit is provided for each viewing room in which a plurality of works of art 100 are arranged at fixed positions on display stand 102. Deployed. Of course, a plurality of monitoring devices 10 may be provided per viewing room.

  As shown in FIG. 2, an RF tag (RFID) 200 is attached to each artwork 100 to be monitored on the back side that does not interfere with viewing. In addition, the museum member S who manages the artwork 100 carries the RF tag 300. As will be described in detail later, the RF tag 200 of the artwork 100 can be switched between a passive method (passive method) and an active method (active method). Here, the passive system is a system that operates using radio waves output from the RF tag reader as an energy source, and the active system is a system that operates using a battery built in the RF tag as an energy source. In the active method, since the RF tag itself transmits radio waves, the radio waves can be transmitted farther than in the passive method. The RF tag 200 of the artwork 100 is operated in a passive manner when the communication distance may be short to prevent battery consumption, and is operated in an active manner when a long communication distance is required. In this embodiment, the operation method of the RF tag 300 of the gallery member S is an active method, but it may be a passive method.

  The monitoring apparatus 10 monitors the artwork 100 based on the RF tag 200 of the artwork 100 and the RF tag 300 of the museum staff S. More specifically, the movement distance from the fixed position of the art object 100 specified based on the RF tag 200 of the art object 100, the presence or absence of the museum member S determined based on the RF tag 300 of the art worker S, and the like. Based on this, the operation method of the RF tag 200 of the artwork 100 is switched, and an alarm corresponding to the situation is output.

  As shown in FIG. 3, the monitoring device 10 is connected to an in-house LAN 400 stretched around the museum. A personal computer 402 installed in a security room in the museum is connected to the in-house LAN 400. In addition, a portable terminal 404 carried by the museum worker S and a portable terminal 406 carried by the guard G can be connected to the in-house LAN 400 by wireless communication. Further, the in-house LAN 400 is connected to a personal computer 412 installed in a police station via a router 408 and the Internet 410.

  The museum staff S is a person who appropriately maintains the art 100, and the guard G is a person who guards the art 100 in the museum. The museum staff S has the authority to touch the artwork 100 and move the artwork 100 during maintenance.

  A plurality of speakers 414 arranged in the museum are connected to the monitoring device 10, and the monitoring device 10 can output an alarm from these speakers 414. The monitoring device 10 also sends an alarm to the personal computer 402 in the security room, the mobile terminal 404 of the museum staff S, the mobile terminal 406 of the security guard G, and the personal computer 412 of the police station. Can be emitted.

  The monitoring apparatus 10 has an imaging function in addition to an RF tag reading function for communicating with the RF tag 200 of the art object 100 and the RF tag 300 of the museum worker S. Such a monitoring apparatus 10 is configured as shown in FIG. 4, and includes a zoom lens 12 and an image sensor 14. The optical image of the object scene is irradiated on the imaging surface of the image sensor 14 through the zoom lens 12.

  When the power of the monitoring device 10 is turned on, the processor 16 instructs the driver 18a to repeat the exposure operation and the charge reading operation. In response to a timing signal periodically generated at predetermined time intervals, the driver 18a performs exposure of the imaging surface and reading of the electric charges generated thereby.

  The raw image signal based on the read charge is subjected to a series of processes of correlated double sampling automatic gain adjustment and A / D conversion in the CDS / AGC / AD circuit 20. A part of the digital signal output from the CDS / AGC / AD circuit 20 is given to the processor 16 via the image processing circuit 21. The image processing circuit 21 generates image data based on the digital signal given from the CDS / AGC / AD circuit 20 and outputs it to the processor 16. The processor 16 performs automatic tracking and motion search, which will be described later, based on the image data output from the image processing circuit 21. In this automatic tracking, a moving object in the captured image is detected based on the image data, and the moving object is tracked and imaged by a pan rotation operation and a tilt rotation operation described later. In motion search, the movement of a person in an image captured based on image data is detected.

  Further, a part of the digital signal output from the CDS / AGC / AD circuit 20 is supplied to the first signal processing circuit 22, and is first converted from the RGB signal format into a Y signal or a color difference signal, and image correction is performed. After that, it is modulated into luminance and color, and further, a synchronization signal is added to become a TV signal. The TV signal is converted into an analog signal and is output as video from the first signal processing circuit 22. The video-output TV signal is input to a monitor (not shown) in a security room. Further, the TV signal converted into an analog signal is also supplied to the second signal processing circuit 24, undergoes digital conversion and Field / Frame conversion, is JPEG encoded, and further converted into an ETHERNET (registered trademark) signal. The data is output from the communication I / F 26 to the in-house LAN 400. The JPEG-encoded signal output to the in-house LAN 400 is recorded on a hard disk drive (not shown) of the personal computer 402 in the security room. Note that the timer circuit 27 measures time.

  The flash memory 28 stores traveling data 28a set by the personal computer 402 in the security room via the in-house LAN 400. The cyclic data 28a has a zoom magnification, a pan rotation instruction, a tilt rotation instruction, and the like as parameters. Other information stored in the flash memory 28 will be described later as appropriate.

  The processor 16 sets an instruction corresponding to the zoom magnification parameter included in the cyclic data 28a stored in the flash memory 28 to the driver 18b. The driver 18b moves the zoom lens 12 in the optical axis direction, thereby changing the zoom magnification of the optical image irradiated on the imaging surface.

  Further, the processor 16 drives the pan rotation mechanism 30 according to the pan rotation instruction included in the cyclic data 28a, and drives the tilt rotation mechanism 32 according to the tilt rotation instruction.

  In this way, the processor 16 controls the zoom operation, the pan rotation operation, and the tilt rotation operation based on the cyclic data 28a to perform a sequence operation, so that each artwork 100 arranged at a fixed position in the viewing room is sequentially provided. Monitor with attention to. Depending on the pan rotation operation and the tilt rotation operation, not only the imaging system such as the zoom lens 12 and the image sensor 14, but also the antenna 34d having directivity included in the RF tag reader 34 to be described later is rotated to change the directivity direction. Be made. As shown in FIG. 2, the directivity direction L of the antenna 34 d of the RF tag reader 34 is assumed to coincide with the optical axis of the imaging system of the monitoring device 10.

  Further, as described later, the processor 16 outputs an audio signal from the alarm output circuit 36 and outputs an audio alarm from the speaker 414 when it becomes necessary to issue an alarm. Furthermore, when it becomes necessary to issue an alarm to the security room, the museum staff S, the guard G, or the police station, the processor 16 sends an e-mail indicating an alarm based on the e-mail generation program 28d stored in the flash memory 28. Is transmitted to the personal computer 402, the portable terminal 404, the portable terminal 406, and the personal computer 412.

  The RF tag reader 34 is configured as shown in FIG. As illustrated, the RF tag reader 34 includes a microcomputer 34a, a memory 34b, a transmission / reception circuit 34c, an antenna 34d, and an RSSI (Receiver Signal Strength Indicator) detection circuit 34e. The microcomputer 34a controls the operation of the RF tag reader 34 according to a program stored in the memory 34b.

  The transmission / reception circuit 34c transmits radio waves to the RF tag 200 of the artwork 100 and the RF tag 300 of the museum worker S through the antenna 34d, and receives radio waves from the RF tag 200 of the artwork 100 and the RF tag 300 of the museum worker S. The configuration is well known. The antenna 34d is an antenna having directivity, and outputs radio waves in a certain angle range in the pointing direction and receives radio waves from the certain angle range in the pointing direction.

  The RSSI detection circuit 34e detects an RSSI (Reception Signal Strength) value of the radio wave from the RF tag 200 of the artwork 100 received by the transmission / reception circuit 34c via the antenna 34d. The microcomputer 34a stores the identification information and RSSI value of the RF tag 200 detected from the radio wave from the RF tag 200 of the artwork 100, and the identification information of the RF tag 300 detected from the radio wave from the RF tag 300 of the museum worker S. And the information is transferred to the processor 16 in response to a request from the processor 16. The data including the identification information of the RF tag 200 or the identification information of the RF tag 300 received by the RF tag reader 34 from the RF tag 200 of the artwork 100 and the RF tag 300 of the museum member S is referred to as “RF tag data”.

  In general, an RF tag transmits a “question radio wave” to the RF tag from the RF tag reader and asks the RF tag. Is broadcast, and this is detected by an RF tag reader. The RF tag 200 and the RF tag 300 applied to this embodiment are question type RF tags, and the RF tag reader 34 is also an RF tag reader corresponding to the question type RF tag.

  In response to an instruction from the processor 16, the RF tag reader 34 transmits a radio wave of a request for requesting transmission of RF tag data to the RF tag reader 34 to the RF tag 200 of the artwork 100 and the RF tag 300 of the museum worker S. send.

  In addition to the interrogation radio wave, the RF tag reader 34 uses radio waves (hereinafter referred to as “switching radio waves”) for switching the operation method of the RF tag 200 of the artwork 100 between the passive method and the active method. In response to an instruction from the processor 16, the information is transmitted to the RF tag 200 of the artwork 100. This switching radio wave switches the operation method of the RF tag 200 by rewriting the contents of the switch bit 204a (see FIG. 6) provided in the memory 204 (see FIG. 6) of the RF tag 200 of the artwork 100.

  An RF tag 200 attached to the work of art 100 is configured as shown in FIG. As shown in FIG. 6, the RF tag 200 of the artwork 100 includes a microcomputer 202, a memory 204, a transmission / reception circuit 206 including a coil antenna 206a, a passive power supply circuit 208, an active power supply circuit 210, and a battery 212. The microcomputer 202 controls the operation of the RF tag 200 according to a program stored in the memory 204. The transmission / reception circuit 206 transmits / receives radio waves to / from the RF tag reader 34 via the coil antenna 206a, and its configuration is well known.

  The passive power supply circuit 208 includes a rectifier circuit. The transmission / reception circuit 206 generates power from the radio wave received from the RF tag reader 34 via the coil antenna 206a, and this power is transmitted to the microcomputer 202, the memory 204, and the transmission / reception circuit 206. Supply.

  The active power supply circuit 210 supplies and shuts off the power from the battery 212 to the microcomputer 202, the memory 204, and the transmission / reception circuit 206 in accordance with instructions from the microcomputer 202.

  As described above, the memory 204 is provided with the switch bit 204a including a 1-bit storage area, and the microcomputer 202 cuts off the power of the battery 212 when the content of the switch bit 204a is “0”. The active power supply circuit 210 is controlled so that the power of the battery 212 is supplied when the content of the switch bit 204a is “1”. Therefore, the RF tag 200 of the artwork 100 operates in a passive manner when the active power supply circuit 210 does not supply power, and operates in an active manner when supplying power.

  When the transmission / reception circuit 206 receives a switching radio wave from the RF tag reader 34 via the coil antenna 206a, the microcomputer 202 rewrites the content of the switch bit 204a of the memory 204 according to the content of the signal carried by the radio wave. . For example, if the value of a predetermined bit of the signal carried by the switching radio wave is “0”, the content of the switch bit 204a is rewritten to “0”, and if the value of the predetermined bit is “1”, the switch The contents of bit 204a are rewritten to “1”.

  In addition, when the transmission / reception circuit 206 receives the interrogation radio wave from the RF tag reader 34 via the coil antenna 206a, the microcomputer 202 receives the RF tag data including the identification information of the RF tag 200 recorded in the memory 204. The radio wave is transmitted from the transmission / reception circuit 206 to the RF tag reader 34 via the coil antenna 206a and output.

  Generally, there are an electromagnetic induction method and a radio wave method as an electromagnetic wave transmission method of an RF tag. In the passive method using the electromagnetic induction method, the communicable distance is about 1 m at the maximum, and the passive method using the radio wave method. Since the communicable distance is about 5 m, the RF tag 200 of the artwork 100 employs a radio wave system having a longer communicable distance. Similarly, the RF tag 300 of the museum member S transmits radio waves in the same manner. Of course, the RF tag reader 34 is also compatible with the radio wave system.

  The RF tag 300 carried by the museum staff S is configured as shown in FIG. As shown in FIG. 7, the RF tag 300 of the museum worker S includes a microcomputer 302, a memory 304, a transmission / reception circuit 306 including a coil antenna 306a, an active power supply circuit 308, and a battery 310.

  The microcomputer 302 controls the operation of the RF tag 300 according to the program stored in the memory 304. The transmission / reception circuit 306 transmits / receives radio waves to / from the RF tag reader 34 via the coil antenna 306a, and its configuration is well known.

  The active power supply circuit 308 always supplies the power from the battery 310 to the microcomputer 302, the memory 304, and the transmission / reception circuit 306. Therefore, the RF tag 300 of the museum worker S always operates in an active manner.

  When the transmission / reception circuit 306 receives the interrogation radio wave from the RF tag reader 34 via the coil antenna 306a, the microcomputer 302 transmits / receives RF tag data including identification information of the RF tag 300 recorded in the memory 304. The signal is output on the radio wave transmitted from the circuit 306 to the RF tag reader 34 via the coil antenna 306a.

  The monitoring device 10 detects the presence of the museum member S by receiving radio waves from the RF tag 300 of the museum member S by the RF tag reader 34. In addition, the monitoring apparatus 10 receives the radio wave from the RF tag 200 of the work 100 by the RF tag reader 34, thereby detecting the presence of the work 100 and detecting the amount of movement of the work 100 from a fixed position.

  The amount of movement of the artwork 100 from the fixed position is the RSSI value of the radio wave that the RF tag reader 34 receives each time from the RF tag 200 of the artwork 100 (hereinafter referred to as “each RSSI value”), and the monitoring device 10. It is detected based on the difference (| every RSSI value−RSSI reference value |) from the RSSI reference value registered in the RSSI reference value DB 28 b formed in the flash memory 28. This RSSI reference value is the transmission / reception of the RF tag reader 34 from the RF tag 200 in a state where the directivity direction of the antenna 34d of the RF tag reader 34 faces the RF tag 200 of the artwork 100 at a fixed position on the decoration table 102. This is the RSSI value of the radio wave received by the circuit 34c via the antenna 34d. The RSSI reference value DB 28b stores, for each artwork 100, an RSSI reference value when the RF tag 200 operates in a passive manner and an RSSI reference value when operated in an active manner.

  The monitoring device 10 according to this embodiment issues an alarm according to the state of the artwork 100 based on the presence / absence of the museum staff S detected as described above, the amount of movement of the artwork 100 from a fixed position, and the like. The operation method of the RF tag 200 of the artwork 100 is switched between the passive method and the active method.

  Hereinafter, the processing executed by the processor 16 when the monitoring device 10 issues an alarm according to the state of the work 100 and switches the operation method of the RF tag 200 will be described with reference to FIGS. 8 to 10. To do. The processor 16 executes processing described below based on a program stored in the flash memory 28.

  There are m art objects 100 (1 ≦ n ≦ m) to be monitored by the monitoring apparatus 10, and the processor 16 starts processing described below from the first art object 100. The mth artwork 100 is sequentially performed through the nth artwork 100. When the m-th artwork 100 is finished, the same processing is again performed on the first artwork 100. In addition, it is assumed that the imaging system of the monitoring apparatus 10 always captures an object scene in steps S1 to S89 of FIGS. The order of processing shown in FIGS. 8 to 10 is an example, and may be changed as appropriate when the present invention can be realized even if the order of processing is changed. It is assumed that the initial value of the switch bit 204a provided in the memory 204 of the FR tag 200 of the artwork 100 is “0”.

  First, in step S1, the processor 16 performs pan rotation operation, tilt rotation operation, and zoom magnification adjustment on the basis of the above-described cyclic data 28a stored in the flash memory 28, so that the nth artwork 100 is obtained. Sequence operation toward. By this sequence operation, the imaging system such as the zoom lens 12 and the image sensor 14 captures the art object 100 at a fixed position on the decoration table 102 as its object field, and the directivity direction of the antenna 34d of the RF tag reader 34 is displayed. It is directed to the RF tag 200 attached to the artwork 100 that is assumed to be in a fixed position on the table 102.

  The traveling data 28a is a data group composed of records created for each piece of identification information of the RF tag 200 of the art object 100 that the monitoring device 10 performs monitoring. As shown in FIG. An item for storing identification information of the RF tag 200 (art work 100), an item for storing a pan rotation operation amount (pan rotation instruction), an item for storing a tilt rotation operation amount (tilt rotation instruction), and a zoom magnification are stored. The items to be included are included.

  The pan rotation operation amount is, for example, an operation amount of pan rotation that is performed so that the imaging system of the monitoring device 10 is directed from the direction of a predetermined reference point toward the art object 100 to be noticed. Further, the tilt rotation operation amount is, for example, an operation amount of tilt rotation that is performed so that the imaging system of the monitoring apparatus 10 is directed from the direction of a predetermined reference point toward the art object 100 to be noticed. Note that the pan rotation movement amount is set so that the imaging system of the monitoring device 10 is the “n−1” th artwork 100 when the artwork 100 that is the next sequence operation target is the nth artwork 100. It may be the amount of pan rotation performed to face the direction of the nth artwork 100 from the direction. The same applies to the amount of tilt rotation operation.

  Since the processor 16 sequentially performs a sequence operation on the art object 100 to be monitored by sequentially referencing the records included in the cyclic data 28a, the processor 16 is included in the item of the record being referred to. The art object 100 currently focused on can be grasped based on the identification information of the RF tag 200 (art object 100).

  In step S3, the processor 16 sends an instruction to the microcomputer 34a of the RF tag reader 34 to read the RF tag data from the RF tag 200 of the artwork 100 and the RF tag 300 of the museum worker S present in the monitored area. Try. Here, the area to be monitored is a range (area) where the antenna 34d of the RF tag reader 34 can transmit and receive radio waves. Further, as described above, the RF tag data is read from the memory 204 of the RF tag 200 of the work 100 or the memory 304 of the RF tag 300 of the museum worker S, and is output from the RF tag 200 output on radio waves. It is information including identification information or identification information of the RF tag 300.

  The microcomputer 34a of the RF tag reader 34 transmits an interrogation radio wave via the antenna 34d in accordance with an instruction from the processor 16, and responds to the interrogation radio wave to the RF tag 200 of the artwork 100 and the RF of the museum worker S. Radio waves (RF tag data) returned from the tag 300 are received via the antenna 34d.

  Since the initial value of the switch bit 204a of the RF tag 200 of the artwork 100 is “0”, the RF tag 200 of the artwork 100 that has received the interrogation radio wave from the RF tag reader 34 operates in a passive manner, and the RF tag 200 A radio wave carrying information (RF tag data) including identification information is returned.

  When the microcomputer 34a of the RF tag reader 34 receives a reply radio wave from the RF tag 200 of the artwork 100, the RF tag 200 (art 100) is identified from the signal (RF tag data) carried by the radio wave. Information is taken out and stored in the memory 34b. The microcomputer 34a also stores the RSSI value detected by the RSSI detection circuit in the memory 34b based on the radio wave returned from the RF tag 200 of the artwork 100. At this time, the identification information of the RF tag 200 and the RSSI value are linked and stored, and it is possible to refer to which RF tag 200 the RSSI value relates to the radio wave. Further, when the microcomputer 34a receives a reply radio wave from the RF tag 300 of the museum member S, the microcomputer 34a obtains identification information of the RF tag 300 (museum member S) from the signal (RF tag data) carried by the radio wave. It is taken out and stored in the memory 34b.

  In step S5, the processor 16 determines whether or not the RF tag data of the RF tag 200 of the work 100 currently focused on has been read as a result of the trial in step S3. That is, the processor 16 sends an instruction to the microcomputer 34a of the RF tag reader 34 to transfer the identification information of the RF tag 200 of the artwork 100 and the identification information of the RF tag 300 of the museum worker S stored in the memory 34b. It is determined whether or not there is identification information that coincides with the identification information of the RF tag 200 of the art object 100 currently focused on among these identification information. Note that the identification information of the RF tag 200 of the art object 100 that is currently focused on is the identification information of the RF tag 200 included in the record item of the cyclic data 28a referred to when performing a sequence operation on the art object 100 in step S1. is there.

  If it is determined in step S5 that the RF tag data of the RF tag 200 of the art object 100 of interest has not been read (step S5: NO), a first alarm is output in step S7 on the assumption of theft. As for the output of the first alarm, an alarm sound is generated from all the speakers 414 in the hall, and the personal computer 402 in the security room, the mobile terminals 404 of all the museum staff S, the mobile terminals 406 of all the security guards G, and the police An e-mail is sent to the station computer 412 telling that the theft has occurred, the location of the viewing room where the theft has occurred, and the name of the stolen artwork 100.

  In addition, the other monitoring apparatus 10 in the museum transmits the identification information of the RF tag 200 of the work 100 that may have been stolen through the in-house LAN 400 together with a signal indicating that the theft has occurred. The monitoring apparatus 10 that has received the signal indicating that the theft has occurred performs a pan rotation operation and attempts to receive the RF tag data of the RF tag 200 of the work 100 that may have been stolen. When RF tag data can be received, automatic tracking of a person who seems to be a criminal theft based on the direction of motion detected in the captured image and the RSSI value of the radio wave received from the RF tag 200 of the artwork 100 I do. The automatic tracking will be described later.

  Next, the processor 16 activates the operation method of the RF tag 200 of the work 100 in step S31 of FIG. Specifically, a switching radio wave is transmitted from the RF tag reader 34, and the contents of the switch bit 204a provided in the memory 204 of the RF tag 200 of the artwork 100 are rewritten from “0” to “1”. By this rewriting, the operation method of the RF tag 200 of the artwork 100 is switched from the passive method to the active method.

  Then, in step S33, the processor 16 pan-rotates the imaging system of the monitoring device 10 and the antenna 34d of the RF tag reader 34 by a predetermined angle, and then transmits a question radio wave from the RF tag reader 34 in step 35. An attempt is made to read the RF tag data of the RF tag 200 of the artwork 100 in the area to be monitored (and the RF tag 300 of the museumer S). At this time, since the content of the switch bit 204a provided in the memory 204 of the RF tag 200 of the artwork 100 is “1”, the RF tag 200 of the artwork 100 responding to the attempt to read the RF tag data in step S35. Operates in an active manner and returns radio waves (RF tag data).

  In step S37, the processor 16 determines whether the RF tag data of the RF tag 200 of the art work 100 of interest, that is, the art work 100 that may have been stolen, has been read. The pan rotation operation in step S33 and the trial of reading the RF tag data in step S35 are determined to have read the RF tag data of the RF tag 200 of the work 100 that may have been stolen in step S37 (step S37: Repeat until YES).

  If it is determined that the RF tag data of the RF tag 200 of the work 100 that may have been stolen has been read (step S37: YES), then in step S39, an attempt to read the RF tag data in step S35 is made. As a result, it is determined whether or not the RF tag data of the RF tag 300 of the museum member S has been read. Whether or not the RF tag data of the RF tag 300 of the museum worker S can be read is received by the RF tag reader 34 on the radio wave from the RF tag 200 of the artwork 100 and the RF tag 300 of the museum worker S, and is stored in the memory 34b. In the stored identification information of the RF tag 200 and the identification information of the RF tag 300, is the identification information registered as the identification information of the museum member S in the museum member DB 28c formed on the flash memory 28? Judgment by whether or not. Here, the museum member S does not indicate a specific museum member but means an arbitrary museum member. The museum member DB 28c stores the identification information (of the RF tag 300) of the museum member S and the mail address assigned to the portable terminal 404 carried by the museum member S in association with each other.

  If the processor 16 determines that the RF tag data of the RF tag 300 of the museum member S has been read (step S39: YES), the processor 16 automatically tracks a person who may be a theft criminal in step S41. In the automatic tracking in step S41, automatic tracking is performed based on the image data generated by the image processing circuit 21. In this automatic tracking, the moving direction of the object (person) in the image based on the image data is detected, and the imaging system and the antenna 34d of the RF tag reader 34 are moved by the pan rotation motion and the tilt rotation motion in the detected movement direction. Track an object (person).

  In this automatic tracking, in addition to the moving direction of the object (person) detected based on the image as a condition for determining the moving direction of the imaging system or the like, the RF tag 200 of the artwork 100 and the RF tag of the museum worker S are used. The RSSI value of the radio wave received from 300 may be added. That is, when the movement of an object (person) is not detected in the image, the RF tag of the RF tag 200 of the artwork 100 and the RF tag 300 of the museum worker S is changed while changing the direction of the antenna 34d of the RF tag reader 34. The imaging system and the antenna are repeatedly operated in such a direction that the RSSI value of the radio wave from the RF tag 200 of the work 100 is increased and the RSSI value of the radio wave from the RF tag 300 of the museum worker S is decreased. Turn 34d.

  During the automatic tracking in step S41, the image size, the image quality, and the image size of the image captured by the imaging system, transferred to the security room via the in-house LAN 400, and recorded on the hard disk drive of the personal computer 402 are recorded. And improve the transfer rate.

  The automatic tracking in step S41 is executed until an instruction to end automatic tracking is given from the personal computer 402 in the security room via the in-house LAN 400.

  If the processor 16 determines in step S43 that an instruction to end automatic tracking has been given (step S43: YES), the processor 16 transmits a switching radio wave from the RF tag reader 34 in step S45, and the RF of the artwork 100 The content of the switch bit 204a of the tag 200 is rewritten from “1” to “0”, the RF tag 200 of the artwork 100 is made passive, and the process returns to step S1. In step S1, a sequence operation is performed on the next (n + 1) th artwork 100.

  On the other hand, if it is determined in step S39 that the RF tag data of the RF tag 300 of the museum member S cannot be read (step S39: NO), the processor 16 is based on the image data generated by the image processing circuit 21 in step 47. Motion search. In this motion search, an image based on image data is divided into, for example, about 4800 small sections, and the direction, size, and frequency of image movement in each section are analyzed in real time. By this analysis, the presence of a person in the image is detected.

  In step S49, it is determined whether or not a person has been detected by the motion search in step S47. If it is determined that a person has been detected (step S49: YES), in this case, there is a person who appears to be a theft criminal on the side of the artwork 100, and the artwork 100 may be moved by the criminal. In step S51, the person detected by the motion search in step S47 is automatically tracked.

  In the automatic tracking in step S51, automatic tracking is performed based on the image data generated by the image processing circuit 21. In this automatic tracking, the moving direction of the object (person) in the image based on the image data is detected, and the imaging system and the antenna 34d of the RF tag reader 34 are moved by the pan rotation motion and the tilt rotation motion in the detected movement direction. Automatically track an object (person).

  In this automatic tracking, the RSSI value of the radio wave received from the RF tag 200 of the artwork 100 is added to the condition for determining the moving direction of the imaging system, in addition to the moving direction of the person detected based on the image. You may do it. That is, when the movement of a person is not detected in the image, the RF tag data of the RF tag 200 of the artwork 100 (and the RF tag 300 of the museum member S) is changed while changing the direction of the antenna 34d of the RF tag reader 34. Are repeated, and the imaging system and the antenna 34d are directed in a direction in which the RSSI value of the radio wave from the RF tag 200 of the work 100 is increased.

  During the automatic tracking in step S51, the image size, the image quality, and the image size of the image captured by the imaging system, transferred to the security room via the in-house LAN 400, and recorded on the hard disk drive of the personal computer 402 are recorded. And improve the transfer rate.

  The automatic tracking in step S51 is executed until an instruction to end automatic tracking is given from the personal computer 402 in the security room via the in-house LAN 400.

  If the processor 16 determines in step S53 that an instruction to end automatic tracking has been given (step S53: YES), the processor 16 transmits a switching radio wave from the RF tag reader 34 in step S55, and the work 100 The content of the switch bit 204a of the RF tag 200 is rewritten from “1” to “0” to make the RF tag 200 passive, and the process returns to step S1.

  On the other hand, if it is determined in step S49 that no person has been detected as a result of the motion search in step S47 (step S49: NO), in this case, it is thought that the culprit has been stolen on the side of the work 100 that may have been stolen. Since there is no person and the artwork 100 is left unattended, automatic tracking in step S51 is not performed, and the RF tag 200 of the artwork 100 is made passive in step S55, and the process returns to step S1.

  However, if it is determined that a person has not been detected as a result of the motion search in step S47, the neglected artwork 100 may be continuously photographed until instructed by the personal computer 402 in the security room.

  The person detection by the motion search in step S47 may be person face detection based on image data or person detection based on a human sensor.

  Returning to step S5 in FIG. 8, as a result of an attempt to read the RF tag data in the monitored area in step S3 after performing the sequence operation on the fixed position of the art object 100 to be monitored in step S1, monitoring is performed. If it is determined that the RF tag data of the RF tag 200 of the target artwork 100 has been read (step S5: YES), the processor 16 starts from the RF tag 200 of the artwork 100 currently focused on as a monitoring target in step S9. The amount of change from the reference value of the RSSI value is specified for the radio wave. Specifying the amount of change in the RSSI value is equivalent to specifying the amount of movement of the artwork 100 from a fixed position on the decoration table 102.

  The change amount of the RSSI value is specified by reading the RSSI reference value in the passive method of the RF tag 200 of the work 100 registered in the RSSI reference value DB 28b formed in the flash memory 28 and the RF tag data in step S3. As a result of the trial, the difference between the RSSI value (each time RSSI value) of the RF tag 200 of the art object 100 stored in the memory 34b of the RF tag reader 34 is obtained.

  Here, the RSSI reference value in the passive method is used because the RSSI value stored in the memory 34b of the RF tag reader 34 is obtained from the RF tag 200 operated in the passive method every time the RF tag data is read in step S3. This is because the detected radio wave is detected. That is, even if the radio wave is transmitted from the RF tag 200 at the same position, the RSSI value is different between the radio wave transmitted by the passive method and the radio wave transmitted by the active method.

  Next, in step S11, the processor 16 determines whether or not the RF tag data of the RF tag 300 of the museum worker S can be read as a result of the attempt to read the RF tag data in step S3. That is, in step S11, the vicinity of the art object 100 of interest (within a range in which the antenna 34d of the RF tag reader 34 facing the RF tag 200 of the art object 100 assumed to be in a fixed position can receive radio waves). It is determined whether or not there is a museum member S.

  If it is determined that the RF tag data of the RF tag 300 of the museum member S could not be read (step S11: NO), then the processor 16 determines that the change amount of the RSSI value specified in step S9 is the first in step S13. It is determined whether or not the threshold value is 1 or more.

  For example, the first threshold is “| −10 dBm |”. When the RSSI value changes within a range of “± 10 dB”, the RF tag 200 is, for example, a range of 10 cm left and right in the horizontal direction of the drawing orthogonal to the directivity direction L (see FIG. 2) of the antenna 34 d of the RF tag reader 34. It will be moved in. In this embodiment including FIG. 2, it is assumed that the RF tag 200 of the artwork 100 moves in the horizontal direction of the drawing orthogonal to the directivity direction L of the antenna 34d. The RSSI value becomes smaller than the RSSI reference value every time the RF tag 200 moves in the direction of the antenna 34d, and the RSSI value becomes larger than the RSSI reference value every time it moves forward. Assuming that the RSSI reference value in the passive method of the RF tag 200 of the work 100 is “−70 dBm”, the range not exceeding the first threshold is “−80 dBm <RSSI value <−60 dBm each time”.

  When it is determined that the amount of change in the RSSI value is not equal to or greater than the first threshold (step S13: NO), processing such as alarm output is performed on the assumption that the movement of the artwork 100 less than 10 cm from the fixed position is within an allowable range. Return to step S1.

  On the other hand, if it is determined that the amount of change in the RSSI value is greater than or equal to the first threshold (step S13: YES), the processor 16 causes the RF tag reader 34 to transmit a switching radio wave in step S15, and the RF tag of the artwork 100. The content of the switch bit 204a provided on the memory 204 of 200 is rewritten from “0” to “1”, and the RF tag 200 of the artwork 100 is activated.

  Further, the processor 16 outputs a second alarm in step S17 on the assumption that the artwork 100 is damaged. In other words, the second alarm is based on the assumption that the RF tag 200 of the artwork 100 may move 10 cm or more and be damaged by someone. The output of the second alarm is to sound an alarm sound from the speaker 414 in the hall, and to the personal computer 402 in the security room, the mobile terminals 404 of all the museum staff S, and the mobile terminals 406 of all the security guards G. Send an e-mail stating that the work 100 may be damaged, the location of the viewing room where the work 100 may be damaged, and the name of the work 100 that may be damaged To do.

  After outputting the second alarm, in step S47 of FIG. 9, as described above, a motion search is performed to detect a person who has moved the artwork 100. If a person is detected, there is a possibility that the work of art 100 may be taken away. In step S51, a person who may have damaged the work of art 100 is automatically tracked. On the other hand, if a person is not detected as a result of the motion search, automatic tracking is not performed in step S51, and a switching radio wave is transmitted from the RF tag reader 34 in step S55, and the switch bit of the RF tag 200 of the artwork 100. The content of 204a is rewritten from “1” to “0”, the RF tag 200 of the artwork 100 is made passive, and the process returns to step S1.

  Returning to step S11 in FIG. 8, if it is determined that the RF tag data has been read from the RF tag 300 of the museum staff S as a result of the attempt to read the RF tag data in step S3 (step S11: YES), that is, a work of art. If it is determined that there is a museum member S in the vicinity of 100, it is determined whether or not the amount of change in the RSSI value specified in step S9 is greater than or equal to the second threshold value.

  For example, the second threshold value is “| −20 dBm |”. When the RSSI value changes within a range of “± 20 dB”, the RF tag 200 moves within a range of 50 cm to the left and right in the horizontal direction of the drawing orthogonal to the directivity direction L (see FIG. 2) of the antenna 34d of the RF tag reader 34. It will be done. Assuming that the RSSI reference value in the passive method of the RF tag 200 of the artwork 100 is “−70 dBm”, the range not exceeding the second threshold is “−90 dBm <every time RSSI value <−50 dBm”.

  If the presence of the museum staff S in the vicinity of the artwork 100 is detected (step S11: YES), the artwork 100 may be moved greatly due to the inspection work of the artwork 100, etc., so the second threshold is the second threshold value. It is set to be larger than one threshold value.

  If it is determined that the amount of change in the RSSI value is not equal to or greater than the second threshold value (step S19: NO), the process returns to step S1 without performing processing such as alarm output under the assumption that there is no abnormality.

  On the other hand, if it is determined that the change amount of the RSSI value is greater than or equal to the second threshold (step S19: YES), a switching radio wave is transmitted from the RF tag reader 34 in step S61 of FIG. The content of the switch bit 204a is rewritten from “0” to “1”, and the RF tag 200 of the artwork 100 is activated.

  Then, in step S63, the processor 16 causes the RF tag reader 34 to output a question radio wave, and tries to read the RF tag data of the RF tag 200 of the artwork 100 and the RF tag 300 of the museum worker S in the monitored area. To do. At this time, since the content of the switch bit 204a of the RF tag 200 of the artwork 100 is “1”, the RF tag 200 of the artwork 100 operates in an active manner and returns radio waves (RF tag data). .

  Next, in step S65, the processor 16 changes the RSSI value based on the RSSI value (each time RSSI value) of the radio wave received from the RF tag 200 of the artwork 100 as a result of the attempt to read the RF tag data in step S63. Specify the amount. The amount of change in the RSSI value depends on the difference between the RSSI value each time and the RSSI reference value in the active method of the RF tag 200 of the artwork 100 registered in the RSSI reference value DB 28b formed on the flash memory 28. Identified.

  Further, in step S67, the processor 16 determines whether or not the RF tag data of the RF tag 300 of the museum member S has been read as a result of the attempt to read the RF tag data in step S63, that is, the museum member near the artwork 100. It is determined whether or not S exists.

  If it is determined that the RF tag data of the RF tag 300 of the museum member S has been read (step S67: YES), the processor 16 then determines that the change amount of the RSSI value specified in step S65 is greater than or equal to the third threshold value in step S69. Judge whether there is.

  For example, the third threshold value is “| −20 dBm |”. When the RSSI value changes within a range of “± 20 dB”, the RF tag 200 moves within a range of 50 cm to the left and right in the horizontal direction of the drawing orthogonal to the directivity direction L (see FIG. 2) of the antenna 34d of the RF tag reader 34. It will be done. Assuming that the RSSI reference value in the active method of the RF tag 200 of the artwork 100 is “−40 dBm”, the range not exceeding the third threshold is “−60 dBm <RSSI value <−20 dBm each time”.

  If it is determined that the amount of change in the RSSI value is equal to or greater than the third threshold (step S71: YES), the processor 16 further determines whether or not a timeout has occurred in step S71. Here, the determination as to whether or not a time-out has occurred is, for example, determining whether or not a predetermined time has elapsed since it was determined in step S19 in FIG. 8 that the amount of change in the RSSI value is equal to or greater than the second threshold value. To do. The determination as to whether or not the predetermined time has elapsed is made based on the time count by the time counting circuit 27. The museum staff S moves the art object 100 in a state where the change amount of the RSSI value exceeds the third threshold value (second threshold value), that is, the art object 100 moves the art object 100 beyond 50 cm from the fixed position. A good time is set, and when the set time elapses, it is determined in step S71 that a timeout has occurred.

  If it is determined that the time-out has occurred (step S71: YES), the processor 16 outputs a third alarm on the assumption that the movable time of the art object 100 by the museum staff S has exceeded in step S73. The output of the third alarm is that the movable time of the artwork 100 has been exceeded with respect to the portable terminal 404 of the museum worker S carrying the RF tag 300 for which the RF tag data has been read in step S67. Then, an e-mail that tells the name of the moved work 100 is transmitted.

  When sending an e-mail to the museum staff S, the museum staff formed in the flash memory 28 based on the identification information of the RF tag 300 of the museum staff S included in the RF tag data determined to have been read in step S67. The e-mail address of the portable terminal 404 of the museum worker S acquired with reference to the DB 28c is used.

  After the output of the third alarm, the process proceeds to step S41 in FIG. 9, and the museum member S is automatically tracked as described above. Thereafter, if there is an instruction to end automatic tracking from the personal computer 402 in the security room (step S43: YES), the RF tag 200 of the artwork 100 is made passive (step S45) and the process returns to step S1.

  On the other hand, when it returns to step S69 and it is judged that the variation | change_quantity of RSSI value is not more than 3rd threshold value (step S69: NO), the processor 16 transmits the radio wave of switching from the RF tag reader 34 in step S75, and art The content of the switch bit 204a of the RF tag 200 of the product 100 is rewritten from “1” to “0” to make the RF tag 200 of the artwork 100 passive.

  Then, in step S77, the processor 16 tries to read the RF tag data of the RF tag 200 of the artwork 100 in the monitored area (and the RF tag 300 of the museumer S). At this time, since the content of the switch bit 204a of the RF tag 200 of the artwork 100 is “0”, the RF tag 200 of the artwork 100 operates in a passive manner and returns radio waves.

  Next, in step S79, the processor 16 changes the RSSI value based on the RSSI value (each time RSSI value) of the radio wave received from the RF tag 200 of the artwork 100 as a result of the trial of reading the RF tag data in step S77. Specify the amount. The amount of change in the RSSI value depends on the difference between the RSSI value each time and the RSSI reference value in the passive method of the RF tag 200 of the artwork 100 registered in the RSSI reference value DB 28b formed on the flash memory 28. Identified.

  Then, in step S81, the processor 16 determines whether or not the change amount of the RSSI value is greater than or equal to the fourth threshold value. For example, the fourth threshold value is “| −10 dBm |”. When the RSSI value changes within the range of “± 10 dB”, the RF tag 200 moves within a range of 10 cm to the left and right in the horizontal direction of the drawing orthogonal to the directivity direction L (see FIG. 2) of the antenna 34d of the RF tag reader 34. It will be done. Assuming that the RSSI reference value in the passive method of the RF tag 200 of the artwork 100 is “−70 dBm”, the range not exceeding the fourth threshold is “−80 dBm <each time RSSI value <−60 dBm”.

  If it is determined that the change amount of the RSSI value is not equal to or greater than the fourth threshold value (step S85: NO), the process returns to step S1 without performing processing such as alarm output under the assumption that there is no abnormality.

  On the other hand, if it is determined that the amount of change in the RSSI value is greater than or equal to the fourth threshold (step S81: YES), the processor 16 outputs a fourth alarm in step S83. If it is determined that the amount of change in the RSSI value is greater than or equal to the fourth threshold, the amount of movement of the artwork 100 is greater than or equal to 50 cm in step S19 of FIG. 8 (the amount of change in RSSI value is greater than or equal to the second threshold). After the determination, it is determined in step S69 of FIG. 10 that the amount of movement of the artwork 100 is not 50 cm or more (the change amount of the RSSI value is not the third threshold or more). Although it can be inferred that it has been returned to the table 102, it means that the artwork 100 has still moved 10 cm or more from the fixed position in step S81 (the change amount of the RSSI value is not less than the fourth threshold value). Therefore, in step S83, the fourth alarm is output on the assumption that the installation position of the art object 100 by the museum staff S is shifted.

  The output of the fourth alarm is that the position of the art object 100 is shifted with respect to the portable terminal 404 of the museum staff S who carries the RF tag 300 that is determined to have read the RF tag data in step S67. An e-mail is sent that tells the name of the artwork 100 that is out of position.

  After outputting the fourth alarm, the process proceeds to step S41 in FIG. 9, and the museum member S is automatically tracked as described above. Thereafter, if there is an instruction to end automatic tracking from the personal computer 402 in the security room (step S43: YES), the RF tag 200 of the artwork 100 is made passive (step S45) and the process returns to step S1. Since the RF tag 200 of the artwork 100 is made passive in step S75 in FIG. 10, when the process proceeds to step S41 through the route in step S83, the passivating process in step S45 may be skipped.

  Returning to step S67, if it is determined that the RF tag data of the RF tag 300 of the museum staff S could not be read as a result of the attempt to read the RF tag data in step S63 (step S67: NO), the processor 16 further performs step In S85, it is determined whether or not the change amount of the RSSI value specified in Step S65 is equal to or greater than a fifth threshold value.

  For example, the fifth threshold value is “| −10 dBm |”. When the RSSI value changes within the range of “± 10 dB”, the RF tag 200 moves within a range of 10 cm to the left and right in the horizontal direction of the drawing orthogonal to the directivity direction L (see FIG. 2) of the antenna 34d of the RF tag reader 34. It will be done. Assuming that the RSSI reference value in the active method of the RF tag 200 of the artwork 100 is “−40 dBm”, the range not exceeding the fifth threshold is “−50 dBm <RSSI value <−30 dBm each time”.

  If it is determined that the amount of change in the RSSI value is not equal to or greater than the fifth threshold value (step S85: NO), it can be assumed that the museum staff S has left the work 100 at a fixed position on the decoration table 102 in this case. 16, in step S87, a switching radio wave is transmitted from the RF tag reader 34, and the content of the switch bit 204 a of the RF tag 200 of the artwork 100 is rewritten from “1” to “0” to change the RF tag 200 of the artwork 100. Passivate and return to step S1.

  On the other hand, when determining that the amount of change in the RSSI value is equal to or greater than the fifth threshold (step S85: YES), the processor 16 outputs a fifth alarm in step S89. If it is determined in step S85 that the amount of change in the RSSI value is greater than or equal to the fifth threshold, the museum staff member S who has moved the artwork 100 by 50 cm or more to perform the inspection work has finished the inspection work and has left. It is still speculated that the position of the artwork 100 is displaced by 10 cm or more from the fixed position. Therefore, in step S89, the fifth alarm is output on the assumption that the museum staff S has forgotten to return the work 100 to the home position.

  For the output of the fifth alarm, the art object 100 is forgotten to return to the home position for the portable terminal 404 of the museum worker S who carries the RF tag 300 that is determined to have read the RF tag data in step S11 of FIG. And an e-mail that tells the name of the artwork 100 that has been forgotten to be returned.

  After outputting the fifth alarm, the process proceeds to step S47 in FIG. 9, and as described above, a motion search is performed, and if a person is detected as a result of the motion search, the person is automatically tracked ( Step S51), the RF tag 200 of the artwork 100 is made passive (step S55), and then the process returns to step S1.

  On the other hand, if no person is detected as a result of the motion search, the RF tag 200 of the artwork 100 is made passive without performing automatic tracking (step S55), and the process returns to step S1.

In the above-described embodiment, the detection of the person by the motion search and the automatic tracking of the person are performed after the alarm is output. However, the process may be terminated by the output of the alarm without performing these, and the process may return to step S1. .
<Second Embodiment>
The monitoring device 10 according to this embodiment issues an alarm according to the state of the artwork 100 based on the presence / absence of the museum staff S, the amount of movement of the artwork 100 from a fixed position, and the person based on the image. Toggles between automatic tracking execution and stop. Note that the RF tag 200 of the artwork 100 may be activated in accordance with the execution of the automatic tracking, and the RF tag 200 may be passiveized in accordance with the stop of the automatic tracking. The RF tag 200 always operates in an active manner.

  The configuration of the monitoring device 10 of this embodiment, the RF tag 200 of the artwork 100, and the RF tag 300 of the museum worker S is the same as that of the first embodiment except for the processing executed by the processor 16. It is. Therefore, the description of the overlapping part is omitted, and the following description is performed using the same reference numerals as those in the first embodiment.

  Hereinafter, processing executed by the processor 16 of the monitoring apparatus 10 according to this embodiment will be described with reference to FIGS. 12 and 13. Note that the processing order shown in FIGS. 12 and 13 is an example, and may be changed as appropriate when the present invention can be realized even if the processing order is changed.

  First, in step S101, the processor 16 performs pan rotation operation, tilt rotation operation, and zoom magnification adjustment on the basis of the cyclic data 28a stored in the flash memory 28, so that the nth artwork 100 to be noticed is obtained. The sequence operation is performed.

  Next, in step S103, the processor 16 tries to read RF tag data from the RF tag 200 of the artwork 100 and the RF tag 300 of the museum worker S existing in the monitored area. Since the content of the switch bit 204a of the RF tag 200 of the artwork 100 is always “1”, the RF tag 200 always transmits the RF tag data by the active method.

  In step S105, the processor 16 determines whether or not the RF tag data of the RF tag 200 of the work 100 of interest is currently read as a result of the trial in step S103.

  If it is determined that the RF tag data of the RF tag 200 of the artwork 100 could not be read (step S105: NO), a sixth alarm is output in step S107 on the assumption of the possibility of theft. The output of the sixth alarm is to sound an alarm sound from all the speakers 414 in the hall, as well as the personal computer 402 in the security room, the mobile terminals 404 of all the museum staff S, the mobile terminals 406 of all the security guards G, and the police. An e-mail is sent to the station computer 412 telling that the theft has occurred, the location of the viewing room where the theft has occurred, and the name of the stolen artwork 100. After outputting the sixth alarm, the process returns to step S101.

  In addition, the other monitoring apparatus 10 in the museum transmits the identification information of the RF tag 200 of the work 100 that may have been stolen through the in-house LAN 400 together with a signal indicating that the theft has occurred. The monitoring apparatus 10 that has received the signal indicating that the theft has occurred performs a pan rotation operation and attempts to receive the RF tag data of the RF tag 200 of the work 100 that may have been stolen. When RF tag data can be received, automatic tracking of a person who seems to be a theft criminal is performed based on the motion direction detected in the image and the RSSI value of the radio wave received from the RF tag 200 of the work 100. .

  On the other hand, when it is determined in step S105 that the RF tag data of the RF tag 200 of the artwork 100 has been read as a result of the attempt to read the RF tag data in step S103 (step S105: YES), the processor 16 determines in step S109. The amount of change indicating how much the RSSI value of the radio wave from the RF tag 200 of the work 100 currently focused as a monitoring target has changed from the RSSI reference value is specified.

  The change amount of the RSSI value is specified by reading the RSSI reference value in the active method of the RF tag 200 of the work 100 registered in the RSSI reference value DB 28b formed in the flash memory 28 and the RF tag data in step S103. As a result of the trial, the difference is obtained from the RSSI value (each time RSSI value) of the RF tag 200 of the work 100 stored in the memory 34b of the RF tag reader 34.

  Next, in step S111, the processor 16 determines whether or not the RF tag data of the RF tag 300 of the museum worker S could be read as a result of the trial of reading the RF tag data in step S103. That is, it is determined whether or not there is a museum member S in the vicinity of the art object 100 of interest.

  If it is determined that the RF tag data of the RF tag 300 of the museum member S could not be read (step S111: NO), then the processor 16 determines that the change amount of the RSSI value specified in step S9 is the first in step S113. It is determined whether or not the threshold value is 6 or more.

  For example, the sixth threshold value is “| −10 dBm |”. When the RSSI value changes within the range of “± 10 dB”, the RF tag 200 moves within a range of 10 cm to the left and right in the horizontal direction of the drawing orthogonal to the directivity direction L (see FIG. 2) of the antenna 34d of the RF tag reader 34. It will be done. Assuming that the RSSI reference value in the active method of the RF tag 200 of the artwork 100 is “−40 dBm”, the range not exceeding the sixth threshold is “−50 dBm <RSSI value <−30 dBm each time”.

  If it is determined that the change amount of the RSSI value is not equal to or greater than the sixth threshold (step S113: NO), processing such as output of an alarm is performed on the assumption that the movement of the artwork 100 less than 10 cm from the home position is within an allowable range. Return to step S101.

  On the other hand, when determining that the change amount of the RSSI value is equal to or larger than the sixth threshold (step S113: YES), the processor 16 starts automatic tracking in step S115. In the automatic tracking started in step S115, automatic tracking is performed based on the image data generated by the image processing circuit 21. In this automatic tracking, the moving direction of the object (person) in the image based on the image data is detected, and the imaging system and the antenna 34d of the RF tag reader 34 are moved by the pan rotation motion and the tilt rotation motion in the detected movement direction. Automatically track an object (person).

  In this automatic tracking, in addition to the moving direction of the object (person) detected based on the image as a condition for determining the moving direction of the imaging system or the like, the RSSI of the radio wave received from the RF tag 200 of the artwork 100 is obtained. You may make it add a value. That is, when the movement of a person is not detected in the image, the RF tag data of the RF tag 200 of the artwork 100 (and the RF tag 300 of the museum member S) is changed while changing the direction of the antenna 34d of the RF tag reader 34. Are repeated, and the imaging system and the antenna 34d are turned in a direction in which the RSSI value of the radio wave from the RF tag 200 of the artwork 100 increases.

  During the automatic tracking in step S115, the image size, the image quality, and the image size of the image captured by the imaging system, transferred to the security room via the in-house LAN 400, and recorded on the hard disk drive of the personal computer 402 are recorded. And improve the transfer rate.

  Next, in step S117, the processor 16 outputs a seventh alarm on the assumption that the artwork 100 is damaged. That is, the seventh alarm is based on the premise that there is a possibility that the RF tag 200 of the artwork 100 may move 10 cm or more and be damaged by somebody. The output of the seventh alarm is to sound an alarm sound from all the speakers 414 in the hall and to the personal computer 402 in the security room, the mobile terminals 404 of all the museum staff S, and the mobile terminals 406 of all the security guards G. Then, an e-mail is sent that tells that there is a possibility that the work of art 100 may be damaged, and the location of the viewing room where the work of art 100 that may be damaged exists and the name of the damaged work 100.

  After outputting the seventh alarm, when an instruction to end automatic tracking is sent from the personal computer 402 in the security room, the processor 16 determines that in step S119 and ends automatic tracking in step S121. Then, the process returns to step S101.

  Returning to step S111, if it is determined that the RF tag data of the museum worker S has been read as a result of the attempt to read the RF tag data in step S103 (step S111: YES), that is, the museum worker S near the artwork 100. Processor 16 determines whether or not the amount of change in the RSSI value identified in step S109 is greater than or equal to the seventh threshold value.

  For example, the seventh threshold value is “| −20 dBm |”. When the RSSI value changes within a range of “± 20 dB”, the RF tag 200 moves within a range of 50 cm to the left and right in the horizontal direction of the drawing orthogonal to the directivity direction L (see FIG. 2) of the antenna 34d of the RF tag reader 34. It will be done. Assuming that the RSSI reference value in the active method of the RF tag 200 of the artwork 100 is “−40 dBm”, the range not exceeding the seventh threshold is “−60 dBm <RSSI value <−20 dBm each time”.

  When the presence of the museum staff S in the vicinity of the artwork 100 is detected (step S111: YES), the artwork 100 may be moved greatly due to the inspection work of the artwork 100, etc. It is set to be larger than 6 threshold values.

  If it is determined that the change amount of the RSSI value is not equal to or greater than the seventh threshold value (step S123: NO), the process returns to step S101 without performing processing such as alarm output under the assumption that there is no abnormality.

  On the other hand, if it is determined that the amount of change in the RSSI value is greater than or equal to the seventh threshold (step S123: YES), automatic tracking is started in step S131 of FIG. In the automatic tracking that starts in step S131, automatic tracking is performed based on the image data generated by the image processing circuit 21. In this automatic tracking, the moving direction of the object (person) in the image based on the image data is detected, and the imaging system and the antenna 34d of the RF tag reader 34 are moved by the pan rotation motion and the tilt rotation motion in the detected movement direction. Automatically track an object (person). In this case, it is considered that the person tracked by the automatic tracking is the museum worker S whose RF tag data has been read in step S111 of FIG.

  In this automatic tracking, the RSSI value of the radio wave received from the RF tag 200 of the artwork 100 is added to the condition for determining the moving direction of the imaging system, in addition to the moving direction of the person detected based on the image. You may do it. That is, when the movement of a person is not detected in the image, the RF tag data of the RF tag 200 of the artwork 100 (and the RF tag 300 of the museum member S) is changed while changing the direction of the antenna 34d of the RF tag reader 34. Are repeated, and the imaging system and the antenna 34d are directed in a direction in which the RSSI value of the radio wave from the RF tag 200 of the work 100 is increased.

  The automatic tracking started in step S131 is executed in parallel with the processing after step S133.

  When the automatic tracking is started, the processor 16 causes the RF tag reader 34 to output a radio wave of a question in step S133, and the RF tag data of the RF tag 200 of the artwork 100 and the RF tag 300 of the museum worker S in the monitored area. Attempt to read.

  Next, in step S135, the processor 16 changes the RSSI value based on the RSSI value (each time RSSI value) of the radio wave received from the RF tag 200 of the artwork 100 as a result of the attempt to read the RF tag data in step S133. Specify the amount.

  Further, in step S137, the processor 16 determines whether or not the RF tag data of the RF tag 300 of the museum worker S has been read as a result of the attempt to read the RF tag data in step S133. It is determined whether or not S exists.

  If it is determined that the RF tag data of the RF tag 300 of the museum member S has been read (step S137: YES), the processor 16 then determines in step S139 that the change amount of the RSSI value specified in step S135 is greater than or equal to the eighth threshold value. Judge whether there is.

  For example, the eighth threshold value is “| −20 dBm |”. When the RSSI value changes within a range of “± 20 dB”, the RF tag 200 moves within a range of 50 cm to the left and right in the horizontal direction of the drawing orthogonal to the directivity direction L (see FIG. 2) of the antenna 34d of the RF tag reader 34. It will be done. If the RSSI reference value in the active method of the RF tag 200 of the artwork 100 is “−40 dBm”, the range not exceeding the eighth threshold is “−60 dBm <RSSI value <−20 dBm each time”.

  When it is determined that the change amount of the RSSI value is equal to or greater than the eighth threshold (step S139: YES), the processor 16 further determines whether or not a timeout has occurred in step S141. Here, the determination as to whether or not a time-out has occurred is, for example, determining whether or not a predetermined time has elapsed since it was determined in step S123 in FIG. 12 that the RSSI value change amount is greater than or equal to the seventh threshold value. Do by. The determination as to whether or not the predetermined time has elapsed is made based on the time count by the time counting circuit 27. The time when the museum staff S can move the artwork 100 in a state in which the change amount of the RSSI value exceeds the eighth threshold (seventh threshold), that is, the artwork 100 is moved more than 50 cm from the fixed position. A good time is set, and when the set time elapses, it is determined in step S141 that a timeout has occurred.

  If it is determined that a time-out has occurred (step S141: YES), the processor 16 outputs an eighth alarm on the premise that the movable time of the art object 100 by the museum staff S has exceeded in step S143. The output of the eighth alarm is that the movable time of the art object 100 has been exceeded with respect to the portable terminal 404 of the museum worker S carrying the RF tag 300 that is determined to have read the RF tag data in step S137. Then, an e-mail that tells the name of the moved work 100 is transmitted.

  When an instruction to end automatic tracking is sent from the personal computer 402 in the security room after the output of the eighth alarm, the processor 16 determines that in step S145, and ends automatic tracking in step S147. Then, the process returns to step S101.

  On the other hand, returning to step S139, if it is determined that the amount of change in the RSSI value is not equal to or greater than the eighth threshold (step S139: NO), it is within the normal movement range of the art object 100 in the normal inspection work by the museum worker S. Under the assumption, the processor 16 ends the automatic tracking in step S151, and returns to step S101.

  Returning to step S137, if it is determined that the RF tag data of the RF tag 300 of the museum staff S could not be read as a result of the attempt to read the RF tag data in step S133 (step S137: NO), the processor 16 further performs step In S149, it is determined whether or not the change amount of the RSSI value specified in Step S135 is equal to or greater than a ninth threshold value.

  For example, the ninth threshold value is “| −10 dBm |”. When the RSSI value changes within the range of “± 10 dB”, the RF tag 200 moves within a range of 10 cm to the left and right in the horizontal direction of the drawing orthogonal to the directivity direction L (see FIG. 2) of the antenna 34d of the RF tag reader 34. It will be done. Assuming that the RSSI reference value in the active method of the RF tag 200 of the artwork 100 is “−40 dBm”, the range not exceeding the ninth threshold is “−50 dBm <RSSI value <−30 dBm each time”.

  If it is determined that the amount of change in the RSSI value is not equal to or greater than the ninth threshold (step S149: NO), in this case, it can be inferred that the museum staff S has left the work 100 at a fixed position on the decoration table 102, so the processor 16 finishes automatic tracking in step S151, and returns to step S101.

  On the other hand, when determining that the change amount of the RSSI value is equal to or greater than the ninth threshold (step S149: YES), the processor 16 outputs a ninth alarm in step S153. When it is determined in step S149 that the amount of change in the RSSI value is equal to or greater than the ninth threshold, the museum staff member S who has moved the art object 100 by 50 cm or more and performed the inspection work has finished the inspection work and has left. It is still speculated that the position of the artwork 100 is displaced by 10 cm or more from the fixed position. Therefore, in step S153, the ninth alarm is output on the assumption that the museum staff S has forgotten to return the work 100 to the home position.

  For the output of the ninth alarm, the art object 100 is forgotten to return to the home position for the portable terminal 404 of the museum staff member S who carries the RF tag 300 determined that the RF tag data was read in step S111 of FIG. And an e-mail that tells the name of the artwork 100 that has been forgotten to be returned.

  After the output of the ninth alarm, when an instruction to end automatic tracking is sent from the personal computer 402 in the security room, the processor 16 determines that in step S155, ends automatic tracking in step S157, and proceeds to step S101. Return.

  The first embodiment and the second embodiment are examples of the embodiment of the present invention, and various modifications may be made within the scope of the technical idea of the present invention. For example, the processor 16 may be a dedicated application specific integrated circuit (ASIC) designed for the monitoring device 10. Further, a sub processor may be provided in addition to the processor 16, and this sub processor may be responsible for a part of the processing of the processor 16 described above.

  In the first embodiment and the second embodiment, the amount of movement of the position of the work 100 (RF tag 200) is specified based on the RSSI value of the radio wave output from the RF tag 200 of the work 100. However, the method for specifying the amount of movement of the artwork 100 (RF tag 200) is not limited to the method using the change amount of the RSSI value, and may be another method.

  For example, the amount of change in the bit rate value of the signal carried by the radio wave output from the RF tag 200 of the work 100, the question radio wave is output from the RF tag reader 34, and then returned from the RF tag 200 of the work 100. The amount of change in time until the radio wave is received by the RF tag reader 34, the amount of change in the EVM (Error Vector Magnitude) of the radio wave output from the RF tag 200 of the work 100, and the RF tag 200 of the work 100 A method of using the amount of change in RFAGC of a signal carried by a radio wave may be used.

  Furthermore, in the first embodiment and the second embodiment, when it is determined whether or not the museum worker S exists in the vicinity of the artwork 100, the RF tag of the artwork 100 in the monitored area is used. The RF tag data is read from the 200 and the RF tag 300 of the museum staff S, and the identification information included in the read RF tag data is the identification information of the museum staff S registered in the museum staff DB 28c formed in the flash memory 28. Although it was determined by collation, a specific bit indicating the identification information of the museum worker S is provided in the identification information of the museum worker S included in the RF tag data. For example, the bit exists. That the identification information included in the read RF tag data is the identification information of the museum staff S, and that the bit is a specific value. It may be determined that the museum personnel S is present in the vicinity of 100.

It is an illustration figure which shows the example of the utilization form of the monitoring apparatus in 1st Embodiment of this invention. It is an illustration figure which shows the RF tag attached to the work of art in the 1st Embodiment of this invention, and the RF tag which an art worker carries. It is an illustration figure which shows an example of the structure of the network by which the monitoring apparatus in 1st Embodiment of this invention is arrange | positioned. It is a block diagram which shows an example of a structure of the monitoring apparatus in 1st Embodiment of this invention. It is an illustration figure which shows an example of a structure of the RF tag reader in 1st Embodiment of this invention. It is a block diagram which shows an example of a structure of RF tag attached to the work of art in 1st Embodiment of this invention. It is a block diagram which shows an example of a structure of RF tag carried by the museum member in 1st Embodiment of this invention. It is a flowchart which shows an example of the process which the processor of the monitoring apparatus in 1st Embodiment of this invention performs. It is a flowchart following the flowchart of FIG. It is a flowchart following the flowchart of FIG. It is an illustration figure which shows an example of the record structure of the cyclic data in 1st Embodiment of this invention. It is a flowchart which shows an example of the process which the processor of the monitoring apparatus in 2nd Embodiment of this invention performs. FIG. 13 is a flowchart following the flowchart of FIG. 12.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Monitoring apparatus 14 ... Image sensor 16 ... Processor 28d ... E-mail production | generation program 30 ... Pan rotation mechanism 32 ... Tilt rotation mechanism 34 ... RF tag reader 34d ... Antenna 36 ... Alarm output circuit 100 ... Art work 200 ... RF tag 300 ... RF Tag 402 ... Personal computer 404 ... Mobile terminal 406 ... Mobile terminal 412 ... Personal computer G ... Security guard S ... Museum staff

Claims (7)

A monitoring device that monitors a managed product based on a managed product wireless communication tag attached to a managed product to be placed at a fixed position and an administrator wireless communication tag carried by an administrator,
A directional antenna,
Receiving means for receiving radio waves from the managed product wireless communication tag and the administrator wireless communication tag via the antenna;
First detecting means for detecting the presence of the managed product based on radio waves from the managed product wireless communication tag received by the receiving means;
Second detecting means for detecting the presence of the manager based on radio waves from the manager wireless communication tag received by the receiving means;
A specifying unit that specifies a value corresponding to a change amount of the position of the managed product from the fixed position based on a radio wave from the managed product wireless communication tag received by the receiving unit;
Time measuring means for measuring time according to the amount of change specified by the specifying means;
A monitoring apparatus comprising: a control unit that outputs an alarm based on at least one of a detection result of the first detection unit, a detection result of the second detection unit, a specification result of the specification unit, and a time measurement result of the time measurement unit . The control means includes
The monitoring apparatus according to claim 1, further comprising: a first output unit that outputs a first alarm when the first detection unit does not detect the presence of the management target product. The control means includes
The first detection unit detects the presence of the management target product, the second detection unit does not detect the manager, and the change amount specified by the specification unit is greater than or equal to a first threshold value. The monitoring apparatus according to claim 1, further comprising second output means for outputting a second alarm. The control means includes
While the first detection means detects the presence of the management target product and the second detection means continues to detect the presence of the manager, the change amount specified by the specification means timed by the time measurement means The monitoring apparatus according to claim 3, further comprising: a third output unit that outputs a third alarm when a predetermined time elapses for which the value continues to be equal to or greater than a second threshold value greater than the first threshold value. The control means includes
While the first detection means detects the presence of the management target product and the second detection means continues to detect the manager, the change amount specified by the specification means once becomes equal to or greater than the second threshold. The monitoring apparatus according to claim 4, further comprising a fourth output unit that outputs a fourth alarm when the value is smaller than the second threshold value but larger than the first threshold value. The control means includes
The amount of change specified by the specifying unit when the first detecting unit detects the presence of the management target product and the second detecting unit detects the presence of the manager is greater than or equal to the second threshold value. Then, when the second detection means stops detecting the presence of the manager, the fifth output means for outputting a fifth alarm when the change amount specified by the specification means is equal to or greater than the first threshold value. The monitoring device according to claim 4, comprising: The management target is based on a managed product wireless communication tag that can be switched between an active method and a passive method, and an administrator wireless communication tag that is carried by an administrator. A monitoring device for monitoring products,
An imaging means for capturing an optical image of the object scene;
A directional antenna,
Receiving means for receiving radio waves from the manager wireless communication tag and the managed product wireless communication tag via the antenna;
Turning means for turning the imaging means and the antenna;
First detection means for detecting the presence of the managed product based on radio waves received from the managed product wireless communication tag by the receiving means;
Second detecting means for detecting the presence of the manager based on radio waves received from the manager wireless communication tag by the receiving means;
A specifying unit that specifies a value corresponding to a change amount of the position of the managed product from the fixed position based on a radio wave from the managed product wireless communication tag received by the receiving unit;
Time measuring means for measuring time according to the amount of change specified by the specifying means;
The image pickup means is controlled by controlling the turning means based on an image picked up by the image pickup means and a radio wave received from the manager radio communication tag and / or a radio wave from the managed product radio communication tag received by the receiving means. Tracking means for tracking moving objects in
Switching means for switching the operation method of the managed product wireless communication tag between an active method and a passive method,
Based on at least one of the detection result of the first detection means, the detection result of the second detection means, the specification result of the specification means, and the time measurement result of the time measurement means, an alarm is output and the tracking means A monitoring device comprising control means for executing at least one of tracking and switching by the switching means.

Images