JP6380406B2 - Moving object detection system, information processing apparatus, moving object detection method, and control program - Google Patents

Description

  The present invention relates to a moving body detection system, an information processing apparatus, a moving body detection method, and a control program.

  In the above technical field, Patent Document 1 discloses a technique for grasping who is where by using an RFID tag and an infrared sensor.

  Patent Document 2 discloses a technique for identifying a person at a specific position where an RFID tag reader is installed using an RFID tag, using the RFID tag.

  Patent Document 3 discloses a technique for detecting an object intrusion using a pressure sensor and simultaneously identifying the object using an RFID tag.

JP 2001-074855 A JP 2005-242959 A JP 2007-264959 A

  However, the techniques described in the above documents cannot accurately recognize the presence and position of an object from other objects.

  The objective of this invention is providing the technique which solves the above-mentioned subject.

In order to achieve the above object, a system according to the present invention provides:
A first wireless identification tag that accompanies the moving mobile body, stores identification data for identifying the mobile body, and has a wireless communication function;
The movable body is laid on the movable area, the plurality of second wireless identification tag having a wireless communication function stores the identification data for identifying the laying position, and, below the plurality of second radio identification tag A movable body detection sheet comprising a reader antenna that is laid on and that transmits and receives signals between the first wireless identification tag and the plurality of second wireless identification tags;
An output signal connected to the reader antenna and output from the first and second wireless identification tags at the same time is received via the reader antenna, and on the moving object detection sheet based on the received output signal A moving object specifying means for specifying the moving object existing in the position and its position;
Equipped with a,
The moving body specifying means detects, based on an output signal output from the second wireless identification tag, movement that does not accompany the first wireless identification tag on the moving body detection sheet. It is a body detection system.
In order to achieve the above object, another system according to the present invention provides:
A first wireless identification tag that accompanies the moving mobile body, stores identification data for identifying the mobile body, and has a wireless communication function;
A plurality of second wireless identification tags that are laid in an area in which the mobile body is movable, store identification data for identifying a laying position and have a wireless communication function, and below the plurality of second wireless identification tags A movable body detection sheet comprising a reader antenna that is laid on and that transmits and receives signals between the first wireless identification tag and the plurality of second wireless identification tags;
An output signal connected to the reader antenna and output from the first and second wireless identification tags at the same time is received via the reader antenna, and on the moving object detection sheet based on the received output signal A moving object specifying means for specifying the moving object existing in the position and its position;
With
Based on the output signals output from the first and second wireless identification tags, the moving body specifying means includes a moving body that does not accompany the first wireless identification tag in the intrusion prohibited area of the mobile body detection sheet. However, when it is detected that there is no moving object associated with the first wireless identification tag, a warning is issued and the moving body specifying means outputs an output signal output from the first and second wireless identification tags. Based on the above, a warning is issued when it is detected that there is a mobile body that does not accompany the first wireless identification tag but also a mobile body that accompanies the first wireless identification tag. The mobile body detection system further includes a warning means.
In order to achieve the above object, still another system according to the present invention provides:
A first wireless identification tag that accompanies the moving mobile body, stores identification data for identifying the mobile body, and has a wireless communication function;
A plurality of second wireless identification tags that are laid in an area in which the mobile body is movable, store identification data for identifying a laying position and have a wireless communication function, and below the plurality of second wireless identification tags A movable body detection sheet comprising a reader antenna that is laid on and that transmits and receives signals between the first wireless identification tag and the plurality of second wireless identification tags;
An output signal connected to the reader antenna and output from the first and second wireless identification tags at the same time is received via the reader antenna, and on the moving object detection sheet based on the received output signal A moving object specifying means for specifying the moving object existing in the position and its position;
With
Based on the output signals output from the first and second wireless identification tags, the moving body specifying means includes a moving body that does not accompany the first wireless identification tag in the intrusion prohibited area of the mobile body detection sheet. However, when it is detected that there is no mobile object associated with the first wireless identification tag in the intrusion permission area adjacent to the intrusion prohibition area, a warning is issued, and the mobile object specifying means 1. Based on the output signal output from the second wireless identification tag, there is a mobile object not accompanied by the first wireless identification tag in the intrusion prohibited area, but the first wireless identification tag is in the intrusion permitted area. The mobile body detection system further includes warning means that does not issue a warning when it is detected that an accompanying mobile body is present.
In order to achieve the above object, yet another system according to the present invention provides:
A first wireless identification tag that accompanies the moving mobile body, stores identification data for identifying the mobile body, and has a wireless communication function;
A plurality of second wireless identification tags that are laid in an area in which the mobile body is movable, store identification data for identifying a laying position and have a wireless communication function, and below the plurality of second wireless identification tags A movable body detection sheet comprising a reader antenna that is laid on and that transmits and receives signals between the first wireless identification tag and the plurality of second wireless identification tags;
An output signal connected to the reader antenna and output from the first and second wireless identification tags at the same time is received via the reader antenna, and on the moving object detection sheet based on the received output signal A moving object specifying means for specifying the moving object existing in the position and its position;
With
The mobile object specifying means is a mobile object detection system that further specifies a mobile object existing on the mobile object detection sheet and its position by using footprint attributes registered in advance for each mobile object.

  In order to achieve the above object, an apparatus according to the present invention provides:
  A first wireless identification tag that accompanies the moving mobile body, stores identification data for identifying the mobile body, and has a wireless communication function;
  A plurality of second wireless identification tags that are laid in an area in which the mobile body is movable, store identification data for identifying a laying position and have a wireless communication function, and below the plurality of second wireless identification tags A movable body detection sheet comprising a reader antenna that is laid on and that transmits and receives signals between the first wireless identification tag and the plurality of second wireless identification tags;
  An information processing apparatus that communicates with the reader antenna,
  A means for receiving the output signal output from the first and second wireless identification tags at the same time via the reader antenna, and a moving object present on the moving object detection sheet based on the received output signal, and A moving body specifying means for specifying the position,
  The mobile object specifying means detects information indicating that there is a mobile object not associated with the first wireless identification tag on the mobile object detection sheet based on an output signal output from the second wireless identification tag. It is a processing device.
  In order to achieve the above object, another apparatus according to the present invention provides:
  A first wireless identification tag that accompanies the moving mobile body, stores identification data for identifying the mobile body, and has a wireless communication function;
  A plurality of second wireless identification tags that are laid in an area in which the mobile body is movable, store identification data for identifying a laying position and have a wireless communication function, and below the plurality of second wireless identification tags A movable body detection sheet comprising a reader antenna that is laid on and that transmits and receives signals between the first wireless identification tag and the plurality of second wireless identification tags;
  An information processing apparatus that communicates with the reader antenna,
  A means for receiving the output signal output from the first and second wireless identification tags at the same time via the reader antenna, and a moving object present on the moving object detection sheet based on the received output signal, and A moving body specifying means for specifying the position,
  Based on the output signals output from the first and second wireless identification tags, the moving body specifying means includes a moving body that does not accompany the first wireless identification tag in the intrusion prohibited area of the mobile body detection sheet. However, when it is detected that there is no mobile object associated with the first wireless identification tag in the intrusion permission area adjacent to the intrusion prohibition area, a warning is issued, and the mobile object specifying means 1. Based on the output signal output from the second wireless identification tag, there is a mobile object not accompanied by the first wireless identification tag in the intrusion prohibited area, but the first wireless identification tag is in the intrusion permitted area. The information processing apparatus further includes warning means that does not issue a warning when it is detected that an accompanying mobile object is present.
  In order to achieve the above object, still another apparatus according to the present invention provides:
    A first wireless identification tag that accompanies the moving mobile body, stores identification data for identifying the mobile body, and has a wireless communication function;
    A plurality of second wireless identification tags that are laid in an area where the mobile body is movable, store identification data for identifying a laying position and have a wireless communication function;
    A reader antenna that is laid under the plurality of second wireless identification tags and transmits and receives signals between the first wireless identification tag and the plurality of second wireless identification tags;
  In a moving body detection system including a moving body detection sheet comprising: an information processing apparatus that communicates with the reader antenna;
  A means for receiving the output signal output from the first and second wireless identification tags at the same time via the reader antenna, and a moving object present on the moving object detection sheet based on the received output signal, and A moving body specifying means for specifying the position,
  Based on the output signals output from the first and second wireless identification tags, the moving body specifying means includes a moving body that does not accompany the first wireless identification tag in the intrusion prohibited area of the mobile body detection sheet. However, when it is detected that there is no mobile object associated with the first wireless identification tag in the intrusion permission area adjacent to the intrusion prohibition area, a warning is issued, and the mobile object specifying means 1. Based on the output signal output from the second wireless identification tag, there is a mobile object not accompanied by the first wireless identification tag in the intrusion prohibited area, but the first wireless identification tag is in the intrusion permitted area. The information processing apparatus further includes warning means that does not issue a warning when it is detected that an accompanying mobile object is present.
  In order to achieve the above object, still another apparatus according to the present invention provides:
  A first wireless identification tag that accompanies the moving mobile body, stores identification data for identifying the mobile body, and has a wireless communication function;
  A plurality of second wireless identification tags that are laid in an area in which the mobile body is movable, store identification data for identifying a laying position and have a wireless communication function, and below the plurality of second wireless identification tags A movable body detection sheet comprising a reader antenna that is laid on and that transmits and receives signals between the first wireless identification tag and the plurality of second wireless identification tags;
  An information processing apparatus that communicates with the reader antenna,
  A means for receiving the output signal output from the first and second wireless identification tags at the same time via the reader antenna, and a moving object present on the moving object detection sheet based on the received output signal, and A moving body specifying means for specifying the position,
  The mobile object specifying means is an information processing apparatus that further specifies a mobile object existing on the mobile object detection sheet and its position by using footprint attributes registered in advance for each mobile object.

In order to achieve the above object, the method according to the present invention comprises:
A first wireless identification tag that accompanies the moving mobile body, stores identification data for identifying the mobile body, and has a wireless communication function;
A plurality of second wireless identification tags that are laid in an area in which the mobile body is movable, store identification data for identifying a laying position and have a wireless communication function, and below the plurality of second wireless identification tags A movable body detection sheet comprising a reader antenna that is laid on and that transmits and receives signals between the first wireless identification tag and the plurality of second wireless identification tags;
A moving object detection method using
An output signal output from the first and second wireless identification tags at the same time is received via the reader antenna, and on the moving object detection sheet, based on the output signal output from the second wireless identification tag. And a moving body detection method for detecting that there is a moving body not accompanied by the first wireless identification tag .

In order to achieve the above object, a program according to the present invention provides:
A first wireless identification tag that accompanies the moving mobile body, stores identification data for identifying the mobile body, and has a wireless communication function;
A plurality of second wireless identification tags that are laid in an area in which the mobile body is movable, store identification data for identifying a laying position and have a wireless communication function, and below the plurality of second wireless identification tags A movable body detection sheet comprising a reader antenna that is laid on and that transmits and receives signals between the first wireless identification tag and the plurality of second wireless identification tags;
In a mobile object detection system including
Receiving an output signal output from the first and second wireless identification tags at the same time via the reader antenna;
Detecting the presence of a moving body not accompanied by the first wireless identification tag on the moving body detection sheet based on an output signal output from the second wireless identification tag ;
A control program to be executed by a computer.

  According to the present invention, the presence and position of a certain object can be accurately distinguished from other objects.

It is a block diagram which shows the structure of the mobile body detection system which concerns on 1st Embodiment of this invention. It is an external view which shows the structure of the mobile body detection system which concerns on 2nd Embodiment of this invention. It is sectional drawing which shows the structure of the mobile body detection sheet which concerns on 2nd Embodiment of this invention. It is a top view which shows the structure of the mobile body detection sheet which concerns on 2nd Embodiment of this invention. It is a block diagram which shows the structure of the information processing apparatus which concerns on 2nd Embodiment of this invention. It is a figure which shows the structure of the tag output data storage part which concerns on 2nd Embodiment of this invention. It is a figure which shows the structure of the mobile body database which concerns on 2nd Embodiment of this invention. It is a figure which shows the structure of the RFID tag database which concerns on 2nd Embodiment of this invention. It is a figure for demonstrating the front-back / left-right determination processing of the footprint which concerns on 2nd Embodiment of this invention. It is a figure which shows the example of a display of the tag output data concerning 2nd Embodiment of this invention. It is a figure which shows the example of a display of the tag output data concerning 2nd Embodiment of this invention. It is a figure which shows the structure of the foot model database which concerns on 2nd Embodiment of this invention. It is a figure for demonstrating the attribute determination process of the footprint which concerns on 2nd Embodiment of this invention. It is a figure which shows the structure of the footprint attribute database which concerns on 2nd Embodiment of this invention. It is a figure which shows the example of application of the mobile body detection system which concerns on 2nd Embodiment of this invention. It is a figure which shows the example of application of the mobile body detection system which concerns on 2nd Embodiment of this invention. It is a figure which shows the example of application of the mobile body detection system which concerns on 2nd Embodiment of this invention. It is a figure which shows the table which prescribes | regulates the invasion conditions of the mobile body detection system which concerns on 2nd Embodiment of this invention. It is a sequence diagram which shows the process of the mobile body detection system which concerns on 2nd Embodiment of this invention. It is a flowchart which shows the process of the mobile body detection system which concerns on 2nd Embodiment of this invention. It is a figure for demonstrating the example of application of the mobile body detection system which concerns on 2nd Embodiment of this invention. It is a figure for demonstrating the example of application of the mobile body detection system which concerns on 2nd Embodiment of this invention. It is a figure for demonstrating the example of application of the mobile body detection system which concerns on 2nd Embodiment of this invention. It is a figure for demonstrating the example of application of the mobile body detection system which concerns on 2nd Embodiment of this invention. It is a figure for demonstrating the example of application of the mobile body detection system which concerns on 2nd Embodiment of this invention. It is a figure for demonstrating the example of application of the mobile body detection system which concerns on 2nd Embodiment of this invention. It is a figure for demonstrating the example of application of the mobile body detection system which concerns on 2nd Embodiment of this invention. It is a figure for demonstrating the example of application of the mobile body detection system which concerns on 2nd Embodiment of this invention.

  Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. However, the components described in the following embodiments are merely examples, and are not intended to limit the technical scope of the present invention only to them. In the following description, “moving object” includes objects that can move spontaneously, such as humans, animals, vehicles, and robots, as well as objects that can be moved or carried by some other force. It is a concept.

[First Embodiment]
A moving body detection system 100 as a first embodiment of the present invention will be described with reference to FIG. As shown in FIG. 1, the moving object detection system 100 includes a moving object detection sheet 101, a wireless identification tag 102, and a moving object position specifying unit 103.

  The moving body detection sheet 101 is laid in an area where the moving body 110 is movable, and includes a plurality of wireless identification tags 111 that store identification data for identifying the laying position and have a wireless communication function. In addition, the moving object detection sheet 101 includes a plurality of wireless identification tags 111 on an upper layer, and a reader antenna 112 that transmits and receives signals to and from the wireless identification tags 102 and the plurality of wireless identification tags 111.

  The wireless identification tag 102 is attached to the moving mobile object 110, stores identification data for identifying the mobile object 110, and has a wireless communication function.

  The moving body position specifying unit 103 is connected to the reader antenna 112 and receives output signals output from the wireless identification tag 102 and the wireless identification tag 111 via the reader antenna 112. Then, the moving body position specifying unit 103 specifies the moving body 110 existing on the moving body detection sheet 101 and its position based on the received output signal.

  According to the above configuration, since the output signals of the two types of wireless identification tag 102 and wireless identification tag 111 can be acquired using one reader antenna 112, the mobile body 110 existing on the mobile body detection sheet 101 and its The position can be specified accurately and easily. As a result, it is possible to accurately recognize the presence of an object by distinguishing it from other objects.

[Second Embodiment]
Next, a moving body detection system 200 according to a second embodiment of the present invention will be described with reference to FIG. FIG. 2 is a diagram for explaining the appearance of the moving object detection system 200 according to the present embodiment. In the present embodiment, an RFID (Radio Frequency IDentification) tag is used as an example of a radio identification tag.

(Whole system configuration)
The moving body detection system 200 includes a moving body detection sheet 201, an RFID reader 202, and an information processing device 203. The moving body detection sheet 201 is laid on the ground, a floor, a desk, or the like, and a plurality of RFID tags 211 are arranged side by side on the upper surface thereof. Each of the plurality of RFID tags 211 stores identification data (tag ID) unique to the laying position and has a wireless communication function. The RFID tag 251 is fixed to the shoe 205, stores identification data for identifying the shoe 205, and has a wireless communication function. As an attachment target of the RFID tag 251 for specifying the moving body, an object made of a nonmetal having a dielectric constant close to 1 is preferable. Here, the moving body is a person, an animal, or an accessory thereof, and the RFID tag 251 is attached to at least one of footwear, clothes, a cane, and a wheelchair.

  The RFID reader 202 receives the output signal output from the RFID tag 211, generates multi-value tag output data based on the received signal strength, and outputs it to the information processing apparatus 203 together with the ID data of the RFID tag 211. . Further, the RFID reader receives an output signal output from the RFID tag 251, and outputs ID data of the RFID tag 251 to the information processing apparatus 203.

  The information processing device 203 determines the position from the ID data of the RFID tag 211, and represents the attribute of the shoe 205 existing on the moving object detection sheet 201 based on the tag output data corresponding to each RFID tag 211 and the position. Derived footprint attribute information.

  When the RFID tag 211 receives the ID data of the RFID tag 251 at the same time when the RFID tag 211 detects the footprint of the shoe 205, the information processing apparatus 203 identifies the footprint as that of the moving object indicated by the ID data of the RFID tag 251. .

  Furthermore, the information processing apparatus 203 detects the position of the person's foot based on the foot attribute information, and when the person walks on the moving body detection sheet 201 laid on the floor, the information processing apparatus 203 Pair two footprints to detect a series of trajectories. Specifically, the locus of one person's footprint is detected from the output value of the RFID reader 202 using the left-right symmetry and the front-back asymmetry of the person's footprint. For example, if the position, size, and shape of one footprint is detected and it is known as the left foot, it is estimated when and where the right foot of the same person appears, and the footprint shape of the right foot is compared with the footprint shape of the left foot. Thus, it is estimated that the front and rear directions are the same and the left and right are reversed. Then, the right footprint is searched from the plurality of footprints.

  As a result, the information processing apparatus 203 can accurately recognize who and how the user walked on the seat.

(Configuration of moving object detection sheet)
FIG. 3 is a partially enlarged cross-sectional view of the moving object detection sheet 201. The moving object detection sheet 201 includes a reader antenna 301, a spacer 302, and a plurality of RFID tags 211 in layers. The spacer 302 is a thin plate formed of, for example, a dielectric, and is formed on the upper surface of the reader antenna 301. The reader antenna 301 is a traveling wave near-field antenna for readers using a microstrip line that is an open transmission line terminated with matching, and transmits and receives radio signals to and from the RFID tag 211.

  FIG. 4 is a partially enlarged top view of the moving object detection sheet 201. As shown in FIG. 4, in the moving object detection sheet 201, each RFID tag 211 is installed above the reader antenna 301 arranged in a line. The RFID tag 211 includes a chip 401 and a tag antenna 402.

  The RFID reader 202 sends a command with a tag ID as a transmission signal to all the RFID tags 211 via the reader antenna 301 and receives a response signal output from the RFID tag 211 via the reader antenna 301. The other end of the antenna 301 is connected to the ground via a matching termination resistor Rt.

  The RFID tag 211 is installed on the upper surface of the spacer 302 and is electromagnetically coupled to the reader antenna 301. The RFID tag 211 may be an active tag or a passive tag. When the passive tag receives a command signal for querying the tag ID from the reader antenna 301, the passive tag generates power for operating the chip 401 by using a power supply circuit (not shown) in the chip 401 by using a part of the command signal. In the case of an active tag, it operates using the supplied power without generating power.

  The chip 401 of the RFID tag 211 has a storage circuit that stores the tag ID. The chip 401 decodes a part of the signal received from the reader antenna 301 via the tag antenna 402 to generate command data. Then, the RFID tag 211 collates the tag ID stored in the memory circuit in the chip 401 with the tag ID included in a part of the received command data. When the tag IDs match, a modulation circuit (not shown) is operated to generate a modulation signal and transmitted to the reader antenna 301 via the tag antenna 402.

  At this time, if the foot 305 exists at a position where the tag antenna 402 in the RFID tag 211 is electromagnetically coupled, the modulation signal transmitted from the RFID tag 211 is weakened before reaching the reader antenna 301. In other words, the intensity of the received signal received by the reader antenna 301 changes finely according to the presence / absence and position of the foot 305 with respect to each RFID tag 211.

(Strength of electromagnetic coupling)
Here, the signal intensity of the response signal changes as described above because the legs 305 and the tag antenna of the RFID tag 211 are electromagnetically coupled. Therefore, the positional relationship among the foot 305, the RFID tag 211, and the reader antenna 301 will be described in detail below.

  The coupling coefficient indicating the strength of electromagnetic field coupling can be evaluated by an electromagnetic field simulator. Further, when the wavelength of the radio signal between the tag antenna 402 and the reader antenna 301 is λ, a region in which the distance from the wave source (for example, the antenna) is closer than λ / 2π (π is the circumference) is a reactive near field. (Reactive near-field), a region whose distance is longer than λ / 2π and closer to λ is called a radiative near-field, and these two regions are collectively called a near-field region. .

  In this near field, the electromagnetic field has a complex aspect, and there exists a non-negligible intensity ratio between the quasi-electrostatic magnetic field, the induction electromagnetic field, and the radiated electromagnetic field, and the resultant electromagnetic field vector is also spatial. , Changes in time variously. As an example, when the wave source is a minute dipole antenna, the electric field E [V / m] and the magnetic field H [A / m] formed by this antenna are shown in a spherical coordinate system (γ, θ, φ) and a phasor display. It can show by Formula (1)-Formula (4).

ここで、上記式（１）〜式（４）では、微小ダイポールアンテナに蓄えられる電荷をｑ［Ｃ］、アンテナの長さをｌ［ｍ］、波長をλ［ｍ］、波源から観測点までの距離（アンテナ間距離）をγ［ｍ］とした。また、πは円周率、εは誘電率、μは透磁率である。この式（１）〜式（４）の中で、１／γ3に比例する項が準静電磁界、１／γ2に比例する項が誘導電磁界、１／γに比例する項が放射電磁界を示している。これらの電磁界成分は、各々距離γに対する依存性が異なるため、距離γに依存してその相対強度が変化する。

Here, in the above formulas (1) to (4), the charge stored in the minute dipole antenna is q [C], the length of the antenna is l [m], the wavelength is λ [m], and from the wave source to the observation point (Distance between antennas) was γ [m]. Further, π is a circular constant, ε is a dielectric constant, and μ is a magnetic permeability. In the equations (1) to (4), a term proportional to 1 / γ3 is a quasi-electrostatic magnetic field, a term proportional to 1 / γ2 is an induction electromagnetic field, and a term proportional to 1 / γ is a radiated electromagnetic field. Is shown. Since these electromagnetic field components have different dependencies on the distance γ, the relative strength changes depending on the distance γ.

  As the inter-antenna distance γ increases, the electric field strength decreases, and the component ratio also changes. For example, in the region of γ <λ / 2π, the electric field strength increases in the order of quasi-electrostatic field, induction field, and radiation field, and in the region of γ> λ / 2π, the field strength decreases in order of quasi-electrostatic field, induction field, and radiation field. . Furthermore, the contribution of the quasi-electrostatic field and the induced electric field is extremely small in the region where γ> λ, and only the radiation field component is present in the far field where γ> 2λ. On the other hand, in the region of γ <λ, the contribution of the quasi-electrostatic field and the induced electric field remains sufficiently, and in the reactive near field of γ <λ / 2π, the quasi-electrostatic field and the induced electric field make a large contribution. Further, as seen in the equations (1) to (4), compared to the radiated electric field, the quasi-electrostatic magnetic field and the induction electromagnetic field have a γ direction component and a φ direction component in addition to the θ direction component, It has components in various directions.

  In general, compared to the radiated electromagnetic field radiated from the antenna into space, the quasi-electrostatic field and the induced electromagnetic field that remain in the vicinity of the antenna are dominant in the reactive near field. Strong electromagnetic field strength. In the near field of radiation, in general, the absolute electromagnetic field strength becomes weaker as the distance from the wave source becomes longer. In addition, the relative strength of the quasi-electrostatic magnetic field and the induction electromagnetic field is weakened, and the relative strength of the radiated electromagnetic field is increased. As described above, a quasi-electrostatic magnetic field and an induction electromagnetic field exist in the near field, and the coupling between the reader antenna 301 and the tag antenna 402 and the coupling between the tag antenna 402 and the foot 305 are caused by these electromagnetic fields.

  When the foot 305 is present, the foot 305 and the tag antenna 402 form a coupling circuit. Therefore, the resonance frequency of the tag antenna 402 and the feed point impedance of the tag antenna 402 are changed as compared with the case without the foot 305. The tag antenna 402 resonates at a frequency of a signal used for communication in free space, and the feed point impedance is adjusted so that the reception sensitivity is maximized. Therefore, the above change lowers the reception sensitivity, and further adversely affects the operation of the tag antenna 402 when sending a reflected signal to the RFID reader 202. As a result, the transmission output of the signal reflected by the RFID tag 211 decreases. Therefore, the tag cannot generate a reflected electromagnetic field with sufficient strength. As a result, the intensity and phase of the reflected electromagnetic field reaching the RFID reader 202 change greatly with changes in the resonance frequency of the tag. When the foot 305 is close, the intensity or phase of the reflected electromagnetic field from the RFID tag 211 changes greatly compared to when the foot 305 is far, so that the RFID reader 202 can detect the position of the foot 305. That is, as a result of the change in the operational characteristics of the tag antenna 402 depending on the position of the foot 305, the RFID reader 202 can detect the intensity or phase change of the reflected signal from the RFID tag 211, and the position of the foot is detected from the detection result. Can be detected.

  The mobile object detection system 200 is based on an RFID system. The RFID tag 211 has a unique ID (tag ID), and multiple access is possible based on the tag ID. Therefore, if the tag ID of the RFID tag 211 and the place where the foot 305 is disposed are linked, the place where the foot 305 is located can be identified from the tag ID of the RFID tag 211 having a weak output signal strength. On the other hand, when there is no foot 305, the RFID tag 211 responds to a signal from the RFID reader 202, and the RFID reader 202 can read the tag ID of the RFID tag 211. When there is no foot 305, the tag ID of the RFID tag 211 can be read with the intensity of the normal reflected electromagnetic field, so that the absence of the foot 305 can be detected. Further, the location without the foot 305 can be specified from the tag ID of the read RFID tag 211.

  Note that although a method for detecting a change in signal strength due to a shift in the resonance frequency of the tag antenna 402 from the radio communication frequency has been described here, the present invention is not limited to this. If the resonance frequency is deviated, the presence or absence of a foot may be detected by sweeping the wireless communication frequency within a legally permitted range of the reader and detecting a shift in the resonance frequency. Also, the phase changes greatly before and after the resonance frequency. Therefore, it goes without saying that the presence or absence of a foot can also be detected by observing the phase change.

  In the moving object detection system 200, the distance L1 satisfies the relationship L1 ≦ λ / 2π. When the foot 305 affects the frequency characteristics of the tag antenna 402, when the first distance L1 is located within the reactive near field that satisfies the relationship of L1 ≦ λ / 2π, L1> λ / 2π The intensity of the electromagnetic field formed by the tag antenna 402 is higher than that in the case of the near-field radiation. Furthermore, the contribution of the quasi-electrostatic magnetic field and the induction electromagnetic field that remain in the vicinity of the antenna becomes relatively large, and the contribution of the radiated electromagnetic field becomes small. Therefore, in the moving body detection system 200, the coupling between the foot 305 and the tag antenna 402 is strengthened. As a result, the influence on the operational characteristics of the tag antenna 402 due to the presence of the foot 305 is increased. Therefore, the moving body detection system 200 also has a large change in the reflected electromagnetic field transmitted from the RFID tag 211 to the RFID reader 202, becomes a moving body detection system that is resistant to disturbance and noise, and can suppress erroneous detection.

  In the moving object detection system 200, the line-of-sight distance L2 satisfies the relationship of L2 ≦ λ / 2π. As described above, when the line-of-sight distance L2 satisfies the relationship of L2 ≦ λ / 2π, the moving body detection system 200 allows the quasi-electrostatic magnetic field to remain near the antenna as compared with the case where the line-of-sight distance L2 is L2> λ / 2π. And the contribution of the induction electromagnetic field becomes relatively large, and the coupling between the reader antenna 301 and the tag antenna 402 becomes strong. Therefore, in the moving body detection system 200, communication between the RFID reader 202 and the RFID tag 211 is also less susceptible to disturbance and noise. Thereby, the mobile body detection system 200 can implement | achieve the mobile body detection system which is hard to receive a disturbance and noise. In addition, since the electromagnetic field components of the quasi-electrostatic magnetic field, the induction electromagnetic field, and the radiated electromagnetic field are mixed with sufficient strength, and the vector direction changes with time, the moving object detection system 200 includes the reader antenna 301. And the degree of freedom of the relative orientation of the tag antenna 402 can be improved.

  Furthermore, in the moving body detection system 200, the line-of-sight distance between the reader antenna 301 and the RFID tag 211 is approximately 0. 0 in the UHF band, which is one of the RFID standard frequencies, by satisfying the relationship of L2 ≦ λ / 2π. It is about 0.02 m or less in the band of 05 m or less and 2.4 GHz. Therefore, according to the moving object detection system 200, a wide space is not required between the reader antenna 301 and the RFID tag 211.

  In addition, by using an open transmission line that emits less radio waves as the reader antenna 301, the reader antenna 301 and the tag antenna 402 are electromagnetically coupled through a quasi-electrostatic magnetic field and an induction electromagnetic field generated around the open transmission line. To form a coupling circuit. That is, an open transmission line is used as a traveling wave antenna that operates in the near field. With this configuration, a large space is not required between the reader antenna 301 and the RFID tag 211. In addition, since communication between the reader antenna 301 and the tag antenna 402 is performed at a short distance through the coupling circuit, a multipath phenomenon occurs and a thing enters between the place where the reader antenna 301 and the foot 305 are disposed. It is possible to suppress erroneous detection. Furthermore, since an open transmission line terminated with matching is used as the reader antenna 301, the main component of the electromagnetic wave propagating through the antenna does not generate a standing wave but propagates as a traveling wave to the matching end. Here, strictly speaking, the fact that a standing wave does not occur means that the standing wave is sufficiently small. Usually, the standing wave ratio is 2 or less, preferably 1.2 or less. means.

  When the end of the transmission line is matched with sufficient accuracy, or when the electromagnetic wave propagating in the transmission line is sufficiently attenuated near the end of the transmission line, a traveling wave is generated without generating a large standing wave in the transmission line. Becomes the main component. A traveling wave antenna can be formed by utilizing the electromagnetic field distribution in such a transmission line. Further, the electromagnetic field formed in the space around the line has a relatively small radiated electromagnetic field, and an electrostatic magnetic field and an induction electromagnetic field are main components. The electromagnetic field intensity of the electrostatic magnetic field and the induction electromagnetic field is stronger than the intensity of the radiated electromagnetic field, and the electromagnetic field intensity with which the RFID tag 211 can be obtained becomes strong even when the reader is operating with the same output. In other words, it is possible to form an environment in which the radiated electromagnetic field is not scattered around while guaranteeing the operation of the tag.

  In the case of a traveling wave antenna composed of an open transmission line described in the present embodiment, there is no portion where the electromagnetic field distribution does not change even in the vicinity of the antenna, and it always changes everywhere. Therefore, even in the near field, there is no electromagnetic field non-uniformity associated with the standing wave along the antenna, so that an area where the tag ID of the RFID tag 211 cannot be read cannot be formed. That is, the degree of freedom of arrangement of the reader antenna 301 and the tag antenna 402 is improved.

  Further, since this traveling wave is used as a signal to communicate through electromagnetic coupling between the reader antenna 301 and the tag antenna 402, unlike the resonance type antenna, there is no insensitive area, and use is not hindered. Therefore, by extending the transmission line regardless of the wavelength within a range in which the strength of the quasi-electrostatic magnetic field and the induction electromagnetic field generated around the open transmission line is sufficiently large to operate the RFID tag 211, the coverage area can be increased. Can do. That is, in the moving body detection system 200, by using the above-described open transmission line, the radiation loss of power is suppressed, and the cover area can be easily expanded.

  The open transmission line here is basically a transmission line for the purpose of transmitting electromagnetic waves in the longitudinal direction of the line while suppressing radiation, and indicates an open type. Examples include balanced two-wire transmission lines and similar transmission lines, transmission lines such as microstrip lines, coplanar lines, and slot lines, and grounded coplanar lines and triplate lines that are modifications of these transmission lines. In addition, an antenna that spreads in a plane that transmits signals by changing the electromagnetic field in the gap region sandwiched between the mesh-like conductor portion and the sheet-like conductor portion and the leaching region on the outer side of the mesh-like conductor portion depends on the conditions. It is possible to use.

  For example, the reader antenna 301 may be a traveling wave antenna using a grounded coplanar line as an open transmission line. Compared with the case where a microstrip line is used, the electric field distribution is more easily induced on the surface of the coplanar line, and accordingly, the reader antenna 301 and the tag antenna 402 are more easily electromagnetically coupled. A line-of-sight distance L2 from the reader antenna 301 to the tag antenna 402 is a distance between the reader antenna 301 and the tag antenna 402 in a region where the line of sight is visible across the ground conductor.

  For example, a balanced two-wire transmission line may be used as the reader antenna 301. That is, a feeder line composed of two copper wires as a balanced two-wire transmission line may be used as an open transmission line, and this transmission line may be used as a traveling wave antenna. A feeder line is disposed on the side of the RFID tag 211, and two copper wires are provided inside the feeder line. In this case, the direction of the RFID tag 211 and the relative position of the RFID tag 211 with respect to the feeder line can be set very freely. It is also possible to read a plurality of RFID tags 211 with a single feeder line. In addition, since a feeder line used as a reader antenna is based on a transmission line, it is possible to connect a plurality of cables in series and in parallel as long as impedance matching is maintained.

  Further, a coplanar slot line may be arranged in a meander shape as the reader antenna 301. That is, the coplanar slot line may be formed on the surface of the moving object detection sheet 201 with a predetermined bending period.

  As the reader antenna 301, an antenna spreading in a mesh shape may be used. The reader antenna 301 is formed so as to transmit a signal by changing an electromagnetic field in a gap region sandwiched between a mesh-like conductor portion and a sheet-like conductor portion and a leaching region outside the mesh-like conductor portion. A ground conductor may be formed on the back surface of the reader antenna 301 formed in a mesh shape.

  Further, the RFID tag 211 has been described on the premise of a tag incorporating a semiconductor chip, but a chipless RFID tag can also be used. The chipless RFID tag is, for example, a tag in which a plurality of resonators having different resonance frequencies are built in, and an ID number of several bits can be read wirelessly when the reader detects a combination of the resonance frequencies.

  By using the moving body detection sheet 201 having the above-described configuration for moving body detection, the following effects can be obtained.

1. For example, on a rainy day, the movable body detection sheet 201 can be covered with a waterproof sheet. Even so, the detection accuracy of the foot does not drop. Further, when it can be predicted that a minute amount of moisture such as dew condensation will be formed on the surface of the RFID tag 211, it is possible to eliminate the influence of the minute amount of moisture by adjusting a coupling coefficient between the feet and the like.

2. Reaction accuracy Since it does not react with inorganic substances such as plastic and rubber that do not contain moisture, the effects of walking sticks and wheelchairs can be eliminated. On the other hand, since it reacts to light objects such as babies and small animals, it has higher detection accuracy than other mechanisms.

3. Production efficiency Since it is not necessary to form a complicated circuit, the productivity of a movable body detection sheet having a large area can be improved as compared with other mechanisms.

  4). Since the output depends on the distance from the sensor to the foot, the thickness of the shoe sole can be detected. That is, pairing can be performed with higher accuracy, and the walking locus of the same subject can be obtained with higher accuracy.

(Configuration of RFID tag for mobile object identification)
The RFID tag 251 has the same configuration as the RFID tag 211 described in detail as described above, and the exchange of signals with the reader antenna 301 and the function thereof are also the same. However, unlike the RFID tag 211 laid on the floor or the like, the RFID tag 211 is fixed to a shoe 205 as a moving mobile body, stores identification data for identifying the mobile body 110, and has a wireless communication function.

(Configuration of information processing device)
FIG. 5 is a block diagram illustrating a configuration of the information processing apparatus 203. The information processing apparatus 203 includes a communication control unit 501, a tag output data receiving unit 502, a tag output data storage unit 503, an attribute information deriving unit 504, an RFID tag database 505, a footprint model database 506, and a footprint attribute database 507. Furthermore, the information processing apparatus 203 includes a pairing footprint shape position determination unit 508, a moving body footprint identification unit 509, a display image generation unit 510, a moving body identification unit 513, and a moving body database 514. The information processing device 203 is connected to the display device 520 via the communication control unit 501.

  The tag output data receiving unit 502 receives tag output data from the RFID reader 202 via the communication control unit 501. The tag output data is multi-value data output from the RFID tags 211 and 251 and is data indicating how far a foot is detected with respect to the RFID tag 211. The tag output data receiving unit 502 stores the received tag output data in the tag output data storage unit 503. FIG. 6A is a diagram illustrating an example of tag output data stored in the tag output data storage unit 503. As shown in FIG. 6A, the tag output data is data indicating what output data is transmitted with which tag at which time.

  The moving object specifying unit 513 reads out the tag output data stored in the tag output data storage unit 503 related to the tag ID registered in the moving object database 514 as being associated with the moving object. And based on the tag output data, the mobile body which exists in the mobile body detection sheet 201 is specified.

  FIG. 6B is a diagram showing an example of the contents of the mobile database 514. As shown in the figure, the mobile body database 514 stores mobile body type, subject, security level, type (dielectric constant), size, left and right, height (used to derive the stride), and shape data for each tag ID. doing. As for shape data, shape data (combination of tag output data) when the moving body is actually placed on the moving body detection sheet is stored.

  When the moving object specifying unit 513 refers to the tag output data storage unit 503 and detects that a predetermined moving object exists in the moving object detection sheet 201, the moving object specifying unit 513 reads the attribute of the moving object from the moving object database 514, and Along with the acquisition time of the output data, it is passed to the moving body footprint identification unit 509.

  Returning to FIG. 5, the attribute information deriving unit 504 includes a footprint region extracting unit 541, a front / rear determining unit 542, a left / right determining unit 543, and a footprint type determining unit 544. The footprint region extraction unit 541 refers to the tag output data stored in the tag output data storage unit 503 and the position information for each RFID tag stored in the RFID tag database 505. FIG. 7 is a diagram illustrating an example of position information for each RFID tag stored in the RFID tag database 505.

  Then, the footprint region extraction unit 541 maps what tag output data is observed at which position, and when a foot is detected by an adjacent RFID tag, the region formed by the RFID tag is recorded as a footprint. Extract as a region.

  Next, the front / rear determination unit 542 determines the front / rear direction of the foot in the extracted footprint region based on the distribution of the tag output data. Similarly, the left / right determination unit 543 determines whether the foot is left or right based on the distribution of the tag output data. Specifically, as shown in FIG. 3, the shoe sole is generally thin at the tip of the foot 205, and the distance between the foot 205 and the RFID tag 211 is short, so that the signal strength decrease (tag output data) is maximum. It becomes. Therefore, as shown in FIG. 8, when the presence of the foot 205 is detected by a plurality of continuous RFID tags 211 due to weak signal strength, a vertically long region is extracted from the positions of the RFID tags 211, and the signal strength is further increased. The end portion where the drop is significant is determined as the front of the foot 205. Further, the thickness of the shoe sole can be estimated from the output (minimum output value) of the RFID tag 211 that is completely covered by the foot 205.

  On the other hand, in the extracted vertically long region, it can be estimated that there is an arch of the foot 205 in the middle in the vertical direction. That is, since the distance between the foot 205 and the RFID tag 211 is shorter on the laterally outer side of the foot than on the inner side, the signal strength is greatly reduced. Therefore, as shown in FIG. 8, the left / right determination unit 543 compares the signal strength in the horizontal direction in the middle in the vertical direction of the vertically long region, and determines that the side where the signal strength is more significantly decreased is the outside of the foot. As a result, if there is a lower signal strength on the right side of the vertical middle part of the vertical region than the left side, it can be determined as a footprint of the right foot, and conversely, a signal strength greater than that of the left side is present on the left side of the vertical middle part of the vertical region. If there is a decrease, it can be judged as the footprint of the left foot. On the other hand, the heel portion is usually the thickest and stable sensor output is difficult. On the other hand, if there is a clear decrease in signal strength up to the heel, it can be estimated that the shoe has low heels such as bare feet or sandals. When the area of the RFID tag 211 whose signal intensity is weak is small, it can be determined that the foot is a high heel or a child's foot, and further, either the high heel or the child's footstep can be determined from the stride. For example, as shown in FIG. 9, it is possible to determine front and rear and left and right by mapping according to the value of the tag output data. In particular, according to the mapping shown in FIG. 9, the portion where the value of the tag output data is high is the front, and when the C shape is drawn, the vacant side corresponds to the inside of the foot. According to this, in FIG. 9, it can be seen that a region 901 is a footprint of the left foot that proceeds downward in the figure, and a region 902 is a footprint of the next right foot. These footprints can also be displayed as contour lines as shown in FIG. This display is a contour image when tag output data is three-dimensionally mapped in the vertical direction at the center of each RFID tag 211 and cut in plural on the same value plane. Such contour image may be used to derive footprint attributes.

  Returning to FIG. 5, the footprint type determination unit 544 next determines the footprint type while referring to the footprint model database 506. Here, the footprint type includes the center position of the footprint, the exact shape and size of the foot, the type of shoe, and the like. FIG. 11 is a diagram illustrating an example of the footprint model database 506. As shown in FIG. 12, the “distance from the tag center to the foot center” represented by the tag output data differs depending on the state of bare feet, beach sandals, leather shoes, or the like. For example, if the tag center coincides with the foot center, the tag output data has a large value, and maintains a large value to some extent even if the tag center deviates from the foot center. On the other hand, if the shoe center is thick, such as leather shoes, the tag output data will not be very large even if the tag center and the foot center match. Get smaller. On the other hand, if you wear footwear with thin soles such as flip flops, the distance from the tag to the foot is constant, so it changes with almost the same curve as bare feet. That is, if the tag center matches the foot center, the tag output data is a little smaller than the bare foot, but even if the tag center deviates from the foot center, the value is maintained to some extent.

  As described above, when the distance from the tag output data of the plurality of RFID tags 211 is respectively derived to the foot center position and a plurality of circles are drawn from the center of the RFID tag 211 using the distances, the concentration degree of the intersection is the highest. A high model is detected, and the intersection point at that time is detected as the foot center position. By such a method, the attribute of the foot can be obtained very accurately. Note that such footprint model data changes according to the shape, density, and attributes of the tag. That is, it is necessary to select an appropriate footprint model database 506 according to the type of the moving object detection sheet.

  If the tag sensitivity is isotropic, only the distance between the tag center and the foot center may be used. On the other hand, in the case of anisotropy, for example, in the case of an ellipse, a footstep model database is created in advance for each of the x-axis direction and the y-axis direction. The distance to the center position is derived in the x-axis direction and the y-axis direction, respectively. Then, when a plurality of ellipses are drawn from the center of the RFID tag 211 using the distance, the model having the highest concentration of the intersection is detected, and the intersection at that time is detected as the foot center position. Even if the sensitivity of the tag cannot be approximated by a circle or an ellipse, footprint model data of tag output data when the foot center is (x, y) away from the sensor center is created in advance, and the tag for each RFID tag 211 is created. From the output data, the foot center position candidate (x, y) is plotted. Then, it is possible to detect a model having the highest concentration of intersections, and to detect the intersection at that time as the foot center position. Thereby, both the foot center position and the footprint model (shoe type) can be determined with high accuracy.

  Returning to FIG. 5, the footprint attribute information derived by the attribute information deriving unit 504 is stored in the footprint attribute database 507. FIG. 13 is a diagram showing the contents of the footprint attribute database 507. The footprint attribute database 507 stores the reception time, position, shape feature, left and right, front and rear, and shoe sole thickness corresponding to the footprint ID.

  On the other hand, the pairing footprint shape position determination unit 508 obtains the shape, position, and timing of successive footprints attached by the same subject for one footprint. For example, if a footprint of the left foot is found as a reference, a footprint having the same shoe sole thickness as that of the left foot is symmetrically located in a place within 1 m within 0.1-1 second. The moving body footprint identification unit 509 searches the footprint attribute database 507 for footprints having the attributes obtained.

  Furthermore, the moving body footprint specifying unit 509 compares the acquisition time of each footprint with the moving body attribute data acquired from the moving body specifying unit 513 and the acquisition time thereof. Then, when the moving body footprint identifying unit 509 determines that the difference between the acquisition times is equal to or less than a predetermined value, the moving body footprint specifying unit 509 associates the footprint data and the moving body data obtained within a predetermined period.

  If footprint attribute data (a footprint pair) of a specific mobile object is found, the specific mobile object is managed as a footprint subject in the footprint attribute database 507. That is, the moving body information as the main body of the footprint is registered in association with the footprint ID shown in FIG.

  Thereby, the continuous footprint of a specific mobile body can be found out. The display image generation unit 510 calculates the movement of the specific moving body on the moving body detection sheet based on the detected footprint pair, and generates the footprint image so that the display device 520 has the specific moving body. The walking trajectory can be displayed.

  When there are a plurality of people (a person with another RFID tag, a person without an RFID tag) on the moving object detection sheet 201, there is only one reader antenna 301. I do n’t know if it ’s a footprint. Therefore, as described above, in the present embodiment, it is detected that tag data is received from the RFID tag 251 at almost the same timing (for example, a period of ± 1 second) as when the RFID tag 211 on the moving object detection sheet 201 reacts. To do. In that case, it is estimated that the mobile body specified by the tag ID is at the position of the reaction RFID tag 211 on the mobile body detection sheet 201. As a result, the position of the footprint and the subject identification of the footprint can be performed at a time. The display image generation unit 510 may detect and display the number, position, and orientation of the subjects staying on the moving object detection sheet 201 based on the footprint pair.

  As shown in FIG. 14, the display image generation unit 510 has a mobile object 1402 such as an unauthorized person or animal on a part of the RFID tags 211 set as the intrusion prohibited area 1401 on the mobile object detection sheet 201. Is detected and a warning is displayed on the display device 520.

  As shown in FIG. 15, the display image generation unit 510 detects that the moving body 205 accompanied by the RFID tag 251 registered in advance in the intrusion prohibited area 1401 on the moving body detection sheet 201 has entered, and displays it. That can be displayed on the device 520.

  As shown in FIG. 16A, the display image generation unit 510 sets a condition for not issuing a warning even if it detects that an unauthorized mobile body 1402 has entered the intrusion prohibited area 1401 on the mobile body detection sheet 201. It may be set. For example, the warning is canceled when it is detected that the moving body 205 accompanied by the RFID tag 251 registered in advance exists in the intrusion prohibition area 1401 on the mobile object detection sheet 201 or the intrusion permission area adjacent thereto. May be.

  As a premise for realizing such display, in the RFID tag database 505, as shown in FIG. 16B, for each of the RFID tags 211, a mobile body ID that can enter, an intrusion time (valid period), and an intrusion are possible. A table 1601 for defining conditions is prepared. The contents of this table 1601 can be rewritten as appropriate. Examples of the intrusion enabling condition include a condition that “at least two moving bodies registered as intruding movable body IDs exist in the moving body detection sheet 201”.

(Process flow)
FIG. 17 is a sequence diagram illustrating a processing flow of the moving object detection system 100 according to the present embodiment. In step S1700, the RFID reader 202 reads all tag IDs registered in the RFID tag database 505, and in step S1701, transmits the tag IDs to all RFID tags 211 and RFID tags 251 on the sheet.

  In step S1702, each RFID tag 211 performs a tag ID collation process, and responds to the RFID reader 202 if the received ID matches the stored ID.

  In step S1703, the RFID reader 202 generates tag output data from the received signal strength. Next, the RFID reader 202 transmits a tag ID and tag output data in association with the information processing apparatus 203. The information processing apparatus 203 performs a moving body detection process based on the received tag output data (S1707), and further performs various warning processes (S1709).

  FIG. 18 is a diagram for explaining a detailed flow of the moving object detection processing in S1707. First, when tag output data is received in step S1801, next, in step S1803, the footprint region extraction unit 541 extracts a region having a high probability of having a footprint. In step S1805, the front / rear determination unit 542 determines the front / rear of the footprint based on the distribution of the tag output data in the footprint region. In step S1807, the left / right determination unit 543 determines the left / right of the footprint based on the distribution of the tag output data in the footprint area. In step S1809, the footprint type determination unit 544 determines the footprint type based on the distribution of the tag output data in the footprint area and the footprint model data. In step S1811, the moving body footprint identification unit 509 searches for a predetermined trajectory of the moving body (shoes).

  As described above, according to the present embodiment, the trajectory of a specific moving body on the moving body detection sheet can be derived more accurately and effectively. Only people with a specific RFID tag can be identified. For other people, only information on the flow line is acquired, and camera images are not acquired. Security measures can be taken.

  The trajectory of a person accompanied by a specific RFID tag and the trajectory of a person not attached with an RFID tag can be identified. As shown in FIG. 6B, since the size and shape of the left and right footprints are registered separately, the footprint and the moving body can be linked very clearly. By incorporating a security level into the tag, the intrusion area can be controlled for each moving object, such as this tag, this tag, and so on. Position identification and person identification can be performed integrally with one reader and one device, and the identification accuracy is improved.

[Application example]
An application example of the moving object detection system 200 according to the above-described embodiment will be described with reference to FIG.

(Application examples in the security field)
According to the above-described embodiment, as shown in FIG. 19, it is possible to control an alarm by distinguishing the person permitted to enter 1902 and the other 1903 in a restricted access area such as a bank vault 1901.

  For example, only when the permitted entry person 1902 is on the same moving object detection sheet 1904, it is possible to perform control for permitting the entry of the restricted entry person 1903 not attached with the RFID tag. As shown in FIG. 19, when the permitted entry person 1902 is on the same moving body detection sheet 1904, the security camera 1905 is not operated, and as shown in FIG. A security camera 1905 and an alarm device (not shown) may be operated.

  Further, even if the person permitted to enter 1902 can control the alert to sound if he / she does not go to a specific shelf by a specific route. Furthermore, if the intruder's trajectory is analyzed and predicted, and if it is left as it is, a warning can be given in advance if the intruder enters the prohibited area.

(Application examples in the marketing field)
By distinguishing store clerk and general customer by extracting the flow line in the store, the work efficiency of the store clerk can be measured and the purchase behavior of the customer can be grasped. As shown in FIG. 21, when the moving object detection sheet 2102 detects the presence of a general customer 2101 without an RFID tag, the movement trajectory of the general customer 2101 is recorded and used for analysis of purchase behavior. it can. Since not only the position but also the direction of the foot can be grasped, it is possible to accurately determine how much dwelling is on which shelf. Since there is no need to analyze the image of the camera 2103, the customer's privacy is not violated at all. In addition, as shown in FIG. 22, regarding the store clerk 2203 to which the RFID tag 2201 is attached, the store clerk's trajectory can be separately analyzed and used to improve the work efficiency of the store clerk.

(Application examples at hospitals and nursing care facilities)
An application method may be considered in which a tag is attached to a doctor (caregiver) and an alarm is issued when a patient (caregiver) enters a specific area without the assistance of a doctor. If the patient goes out of the bed alone, an alarm can be issued, and if the doctor wearing the shoes with the tag is together, the alarm can be stopped. On the other hand, a tag may be attached to the patient, and the destination and the route to the destination may be acquired. For example, as shown in FIG. 23, based on the output of a plurality of RFID tags, an area where an object exists on the RFID tag is analyzed, and it is determined that the patient 2301 has fallen on the moving object detection sheet 2302. You can also. At this time, as shown in FIG. 23, when there are only the other patients 2303 to 2305 around the patient 2301, and as shown in FIG. This can be determined by distinguishing from the case where there is. If there is a medical worker 2402, the information processing apparatus may be controlled so as not to issue an alarm.

  Furthermore, as shown in FIG. 25, a plurality of RFID tags 2551 for wheelchair identification may be installed around the wheel 2511 of the wheelchair 2501 at regular intervals. In this case, the same tag ID may be set for all of the plurality of mobile object identification RFID tags 2551. In this way, the locus of the wheelchair 2501 can be grasped as in the case where the RFID tag 251 is attached to the shoes in the second embodiment. However, a plurality of RFID tags 2551, so that one RFID tag 2551 is turned off with respect to the moving object detection sheet 2503, and another RFID tag 2551 is turned on with respect to the moving object detection sheet 2503. It is preferable to arrange.

(Application example in the field of goods display)
By placing the product 2601 with the RFID tag 2611 for identifying the mobile object on the mobile object detection sheet 2602, the information processing apparatus 2603 recognizes what product is placed and the position information of the product. The product information 2605 can be displayed around the product using the projector 2604.

(Application examples in the field of livestock)
A system that can grasp which livestock is located at which position on the moving object detection sheet by attaching RFID to livestock may be constructed. According to the present embodiment, the type of livestock can be grasped more accurately using the shape of footprints and the like.

[Other Embodiments]
While the present invention has been described with reference to the embodiments, the present invention is not limited to the above embodiments. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention. In addition, a system or an apparatus in which different features included in each embodiment are combined in any way is also included in the scope of the present invention.

  In addition, the present invention may be applied to a system composed of a plurality of devices, or may be applied to a single device. Furthermore, the present invention can also be applied to a case where an information processing program that implements the functions of the embodiments is supplied directly or remotely to a system or apparatus. Therefore, in order to realize the functions of the present invention on a computer, a program installed in the computer, a medium storing the program, and a WWW (World Wide Web) server that downloads the program are also included in the scope of the present invention. . In particular, at least a non-transitory computer readable medium storing a program for causing a computer to execute the processing steps included in the above-described embodiments is included in the scope of the present invention.

  This application claims the priority on the basis of Japanese application Japanese Patent Application No. 2013-234429 for which it applied on November 12, 2013, and takes in those the indications of all here.

Claims (12)

A first wireless identification tag that accompanies the moving mobile body, stores identification data for identifying the mobile body, and has a wireless communication function;
The movable body is laid on the movable area, the plurality of second wireless identification tag having a wireless communication function stores the identification data for identifying the laying position, and, below the plurality of second radio identification tag A movable body detection sheet comprising a reader antenna that is laid on and that transmits and receives signals between the first wireless identification tag and the plurality of second wireless identification tags;
An output signal connected to the reader antenna and output from the first and second wireless identification tags at the same time is received via the reader antenna, and on the moving object detection sheet based on the received output signal A moving object specifying means for specifying the moving object existing in the position and its position;
Equipped with a,
The moving body specifying means detects, based on an output signal output from the second wireless identification tag, movement that does not accompany the first wireless identification tag on the moving body detection sheet. Body detection system. A first wireless identification tag that accompanies the moving mobile body, stores identification data for identifying the mobile body, and has a wireless communication function;
A plurality of second wireless identification tags that are laid in an area in which the mobile body is movable, store identification data for identifying a laying position and have a wireless communication function, and below the plurality of second wireless identification tags A movable body detection sheet comprising a reader antenna that is laid on and that transmits and receives signals between the first wireless identification tag and the plurality of second wireless identification tags;
An output signal connected to the reader antenna and output from the first and second wireless identification tags at the same time is received via the reader antenna, and on the moving object detection sheet based on the received output signal A moving object specifying means for specifying the moving object existing in the position and its position;
With
Based on the output signals output from the first and second wireless identification tags, the moving body specifying means includes a moving body that does not accompany the first wireless identification tag in the intrusion prohibited area of the mobile body detection sheet. However, when it is detected that there is no moving object associated with the first wireless identification tag, a warning is issued and the moving body specifying means outputs an output signal output from the first and second wireless identification tags. Based on the above, a warning is issued when it is detected that there is a mobile body that does not accompany the first wireless identification tag but also a mobile body that accompanies the first wireless identification tag. not further moving object detecting system comprising a warning means. A first wireless identification tag that accompanies the moving mobile body, stores identification data for identifying the mobile body, and has a wireless communication function;
A plurality of second wireless identification tags that are laid in an area in which the mobile body is movable, store identification data for identifying a laying position and have a wireless communication function, and below the plurality of second wireless identification tags A movable body detection sheet comprising a reader antenna that is laid on and that transmits and receives signals between the first wireless identification tag and the plurality of second wireless identification tags;
An output signal connected to the reader antenna and output from the first and second wireless identification tags at the same time is received via the reader antenna, and on the moving object detection sheet based on the received output signal A moving object specifying means for specifying the moving object existing in the position and its position;
With
Based on the output signals output from the first and second wireless identification tags, the moving body specifying means includes a moving body that does not accompany the first wireless identification tag in the intrusion prohibited area of the mobile body detection sheet. However, when it is detected that there is no mobile object associated with the first wireless identification tag in the intrusion permission area adjacent to the intrusion prohibition area, a warning is issued, and the mobile object specifying means 1. Based on the output signal output from the second wireless identification tag, there is a mobile object not accompanied by the first wireless identification tag in the intrusion prohibited area, but the first wireless identification tag is in the intrusion permitted area. A moving body detection system further comprising warning means that does not issue a warning when it is detected that an accompanying moving body is present. The intrusion prohibiting registration of the first wireless identification tag associated with the moving body is allowed to penetrate into the region, the moving object detection according to claim 2 or 3 further comprising a registration means for performing by limiting the effective period system. Moving object detecting system according to claim 2, 3 or 4 which defines the first wireless identification tag for each of said second RFID tag, to allow penetration. A first wireless identification tag that accompanies the moving mobile body, stores identification data for identifying the mobile body, and has a wireless communication function;
A plurality of second wireless identification tags that are laid in an area in which the mobile body is movable, store identification data for identifying a laying position and have a wireless communication function, and below the plurality of second wireless identification tags A movable body detection sheet comprising a reader antenna that is laid on and that transmits and receives signals between the first wireless identification tag and the plurality of second wireless identification tags;
An output signal connected to the reader antenna and output from the first and second wireless identification tags at the same time is received via the reader antenna, and on the moving object detection sheet based on the received output signal A moving object specifying means for specifying the moving object existing in the position and its position;
With
Said mobile identifying means further moving object detecting system using said attributes of previously registered footprint for each mobile, to identify the mobile and its location existing in the moving object detecting sheet. A first wireless identification tag that accompanies the moving mobile body, stores identification data for identifying the mobile body, and has a wireless communication function;
The movable body is laid on the movable area, the plurality of second wireless identification tag having a wireless communication function stores the identification data for identifying the laying position, and, below the plurality of second radio identification tag A movable body detection sheet comprising a reader antenna that is laid on and that transmits and receives signals between the first wireless identification tag and the plurality of second wireless identification tags;
An information processing apparatus that communicates with the reader antenna,
A means for receiving the output signal output from the first and second wireless identification tags at the same time via the reader antenna, and a moving object present on the moving object detection sheet based on the received output signal, and a moving body-specifying means for specifying the position, only including,
The mobile object specifying means detects information indicating that there is a mobile object not associated with the first wireless identification tag on the mobile object detection sheet based on an output signal output from the second wireless identification tag. Processing equipment. A first wireless identification tag that accompanies the moving mobile body, stores identification data for identifying the mobile body, and has a wireless communication function;
  A plurality of second wireless identification tags that are laid in an area in which the mobile body is movable, store identification data for identifying a laying position and have a wireless communication function, and below the plurality of second wireless identification tags A movable body detection sheet comprising a reader antenna that is laid on and that transmits and receives signals between the first wireless identification tag and the plurality of second wireless identification tags;
  An information processing apparatus that communicates with the reader antenna,
  A means for receiving the output signal output from the first and second wireless identification tags at the same time via the reader antenna, and a moving object present on the moving object detection sheet based on the received output signal, and A moving body specifying means for specifying the position,
  Based on the output signals output from the first and second wireless identification tags, the moving body specifying means includes a moving body that does not accompany the first wireless identification tag in the intrusion prohibited area of the mobile body detection sheet. However, when it is detected that there is no moving object associated with the first wireless identification tag, a warning is issued and the moving body specifying means outputs an output signal output from the first and second wireless identification tags. Based on the above, a warning is issued when it is detected that there is a mobile body that does not accompany the first wireless identification tag but also a mobile body that accompanies the first wireless identification tag. An information processing apparatus further comprising warning means. A first wireless identification tag that accompanies the moving mobile body, stores identification data for identifying the mobile body, and has a wireless communication function;
  A plurality of second wireless identification tags that are laid in an area in which the mobile body is movable, store identification data for identifying a laying position and have a wireless communication function, and below the plurality of second wireless identification tags A movable body detection sheet comprising a reader antenna that is laid on and that transmits and receives signals between the first wireless identification tag and the plurality of second wireless identification tags;
  An information processing apparatus that communicates with the reader antenna,
  A means for receiving the output signal output from the first and second wireless identification tags at the same time via the reader antenna, and a moving object present on the moving object detection sheet based on the received output signal, and A moving body specifying means for specifying the position,
  Based on the output signals output from the first and second wireless identification tags, the moving body specifying means includes a moving body that does not accompany the first wireless identification tag in the intrusion prohibited area of the mobile body detection sheet. However, when it is detected that there is no mobile object associated with the first wireless identification tag in the intrusion permission area adjacent to the intrusion prohibition area, a warning is issued, and the mobile object specifying means 1. Based on the output signal output from the second wireless identification tag, there is a mobile object not accompanied by the first wireless identification tag in the intrusion prohibited area, but the first wireless identification tag is in the intrusion permitted area. An information processing apparatus further comprising warning means that does not issue a warning when it is detected that an accompanying mobile object is present. A first wireless identification tag that accompanies the moving mobile body, stores identification data for identifying the mobile body, and has a wireless communication function;
  A plurality of second wireless identification tags that are laid in an area in which the mobile body is movable, store identification data for identifying a laying position and have a wireless communication function, and below the plurality of second wireless identification tags A movable body detection sheet comprising a reader antenna that is laid on and that transmits and receives signals between the first wireless identification tag and the plurality of second wireless identification tags;
  An information processing apparatus that communicates with the reader antenna,
  A means for receiving the output signal output from the first and second wireless identification tags at the same time via the reader antenna, and a moving object present on the moving object detection sheet based on the received output signal, and A moving body specifying means for specifying the position,
  The mobile object specifying unit further specifies a mobile object existing on the mobile object detection sheet and a position thereof using an attribute of a footprint registered in advance for each mobile object. A first wireless identification tag that accompanies the moving mobile body, stores identification data for identifying the mobile body, and has a wireless communication function;
A plurality of second wireless identification tags that are laid in an area in which the mobile body is movable, store identification data for identifying a laying position and have a wireless communication function, and below the plurality of second wireless identification tags A movable body detection sheet comprising a reader antenna that is laid on and that transmits and receives signals between the first wireless identification tag and the plurality of second wireless identification tags;
A moving object detection method using
An output signal output from the first and second wireless identification tags at the same time is received via the reader antenna, and on the moving object detection sheet, based on the output signal output from the second wireless identification tag. A moving body detection method for detecting that there is a moving body not accompanied by the first wireless identification tag . A first wireless identification tag that accompanies the moving mobile body, stores identification data for identifying the mobile body, and has a wireless communication function;
A plurality of second wireless identification tags that are laid in an area in which the mobile body is movable, store identification data for identifying a laying position and have a wireless communication function, and below the plurality of second wireless identification tags A movable body detection sheet comprising a reader antenna that is laid on and that transmits and receives signals between the first wireless identification tag and the plurality of second wireless identification tags;
In a mobile object detection system including
Receiving an output signal output from the first and second wireless identification tags at the same time via the reader antenna;
Detecting the presence of a moving body not accompanied by the first wireless identification tag on the moving body detection sheet based on an output signal output from the second wireless identification tag ;
A control program to be executed by a computer.

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