JP2008070208A - Light position detection system, light id tag device, position detection device, and light position detection method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a small-sized inexpensive light position detection system capable of supporting finely indoor position information, a light ID tag device, a position detection device, and a light position detection method. <P>SOLUTION: The light ID tag device has a storage means for storing ID information, a light transmission means, and a state detection means for detecting the state of a measuring object. The position detection device has a reception means for receiving a light signal from the light ID tag device; a direction detection means for detecting the incident direction of the light signal; an information management means for managing at least the ID information, incident direction information of the received light signal, and relative position information from the detection device of the light ID tag device calculated from the ID information and detected motion state information by the position detection device; a control operation means for specifying the position of the light ID tag device by operating the relative position information managed by the information management means, and a communication means for connecting the light ID tag device to a network. Hereby, this small-sized inexpensive system capable of specifying finely the indoor position information can be provided. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a position detection system, an optical ID tag device, a position detection device, and an optical position detection method for specifying the position of a user.

In the position detection system that identifies the position of the user, the location server controls the blinking state of the optical tag attached to the user, photographs the blinking of the optical tag with a plurality of infrared wide-angle cameras, and each video connected to the location server Each image information and the optical tag position in each captured image are specified by the server, and the optical tag position is integrated by the location server to specify the final user position.
FIG. 9 shows a conventional example of an optical position detection system.
In the figure, 3 is a blinking device such as an infrared LED, and the blinking is controlled by the portable terminal 2. Furthermore, the portable terminal 2 is connected to the location server by means such as a wireless LAN, and blinks the blinking device in response to a request from the location server. In response to a blink request from the location server, the video server analyzes the blink image from the plurality of cameras 5 to analyze the three-dimensional position of the blink point, thereby specifying the user position. That is, in a conventional system, position measurement is performed under the control of a location server (see, for example, Patent Document 1).
JP 2003-329762 A

  However, in the above-described prior art, as shown in the conventional example of the optical position detection system in FIG. 9, the optical tag position is specified based on image information captured by at least a plurality of cameras 5, so that a plurality of cameras are installed for position measurement. Is required. For this reason, there is a problem that the apparatus becomes large. In addition, it is necessary to introduce an expensive processing device for position detection by image processing, and there remains a problem of cost such as high costs for finely capturing indoor position information.

  In view of the above problems, the present invention provides a small and low-cost optical position detection system, an optical ID tag device, a position detection device, and an optical position detection method capable of finely specifying indoor position information. The purpose is to do.

  In order to solve the above-mentioned problem, the invention described in claim 1 is a position detection system comprising at least an optical ID tag device installed in a measurement object and a position detection device connectable to a network, wherein the optical ID The tag device has a storage means for storing ID information, an optical transmission means, and a state detection means for detecting the state of a measurement object, and the position detection device receives an optical signal from the optical ID tag device. Means, direction detection means for detecting the incident direction of the optical signal, the position detecting device calculates at least the ID information, the incident direction information of the received optical signal, and the ID information and the detected motion state information Information managing means for managing relative position information from the detection device of the optical ID tag device, and calculating the relative position information managed by the information management means to determine the position of the optical ID tag device It has a control calculation means for specifying and a communication means for connecting to the optical ID tag device and a network.

  According to the first aspect of the present invention, it is possible to provide a small and low-cost position detection system capable of finely specifying indoor position information.

  The invention according to claim 2 is a position detection system comprising at least an optical ID tag device installed on a measurement object and a position detection device connectable to a network, and the optical ID tag device is at least uniquely determined. Storage means for storing ID information, light transmission means for transmitting ID information stored in the storage, state detection means for detecting at least the posture or motion state of the measurement object, and the position detection device includes the A receiving means for receiving an optical signal from the optical ID tag device; and a direction detecting means for detecting an incident direction of the received signal light, wherein the position detecting device receives at least the ID information and the received optical signal. Information management means for managing relative position information from the detection device of the optical ID tag device calculated from the incident direction information, and the ID information and the detected motion state information; A position detection apparatus comprising: control calculation means for specifying the position of the optical ID tag device by calculating relative position information managed by the information management means; and communication means for connecting to the optical ID tag device and a network It is characterized by comprising.

  According to the second aspect of the present invention, it is possible to provide a small and low-cost position detection system capable of finely specifying indoor position information.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the position detection device has ID information that is uniquely determined, and the position detection device is arranged corresponding to the ID information and the ID information. A position of the optical ID tag device based on the arrangement information and the detected position information of the optical ID tag device calculated by the position detection device specified by the position information. Control means for calculating information is provided.

  According to the third aspect of the invention, it is possible to provide a small and low-cost position detection system capable of finely specifying indoor position information.

  According to a fourth aspect of the present invention, in the first or second aspect of the present invention, the optical ID tag device includes an optical receiving unit, and the position detection device includes an optical transmitting unit.

  According to the fourth aspect of the invention, it is possible to detect a plurality of optical ID tags in the same detection area, and to realize power saving of the optical ID tag.

  According to a fifth aspect of the present invention, in the first or second aspect of the invention, the optical ID tag device has an optical receiving means, and the optical ID tag device avoids an optical signal collision with another optical ID tag device. It has the control means for performing communication control for doing.

  According to the fifth aspect of the present invention, it is possible to detect a plurality of optical ID tags in the same detection area, and to realize power saving of the optical ID tag.

  According to a sixth aspect of the present invention, in the first or second aspect of the invention, the state detection means provided in the optical ID tag device has at least one sensor element for detecting a physical quantity such as vibration, acceleration, geomagnetism, or the like. It is characterized by.

  According to the sixth aspect of the invention, it is possible to detect the motion state of the measurement object and to improve the accuracy of position measurement.

  A seventh aspect of the invention is characterized in that, in the first or second aspect of the invention, the optical ID tag device has a distance measuring means.

  According to the seventh aspect of the invention, it is possible to detect the motion state of the measurement target and to improve the accuracy of position measurement.

  The invention according to claim 8 is an optical ID tag device of a position detection system comprising at least an optical ID tag device installed in a measurement object and a position detection device connectable to a network, and stores information storing ID information And a state detecting means for detecting the state of the measurement object.

  According to the eighth aspect of the present invention, it is possible to provide a small and low-cost optical ID tag device for a position detection system capable of finely specifying indoor position information.

  The invention according to claim 9 is a position detection device of a position detection system comprising at least an optical ID tag device installed in a measurement target and a position detection device connectable to a network, Receiving means for receiving an optical signal, direction detecting means for detecting the incident direction of the optical signal, the position detecting device at least the ID information, the incident direction information of the received optical signal, and the motion state detected with the ID information Information managing means for managing relative position information from the detection device of the optical ID tag device calculated from information, and the position of the optical ID tag device by calculating the relative position information managed by the information management means And a control means for identifying the optical ID tag and a communication means for connecting to the optical ID tag device and a network.

  According to the ninth aspect of the present invention, it is possible to provide a small and low-cost position detecting device for a position detecting system capable of finely specifying indoor position information.

  The invention according to claim 10 is a position detection method in a position detection system comprising at least an optical ID tag device installed on a measurement object and a position detection device connectable to a network, wherein the optical ID tag device comprises: Store at least unambiguous ID information, transmit the stored ID information, detect at least the posture or motion state of the measurement object, and the position detection device receives an optical signal from the optical ID tag device The incident direction of the received signal light is detected, and the position detection device is calculated from at least the ID information, the incident direction information of the received optical signal, and the ID information and the detected motion state information. The relative position information from the detection device of the optical ID tag device is managed, and the position of the optical ID tag device is calculated by calculating the relative position information managed by the information management means. Constant, and characterized by connecting to the optical ID tag device and the network.

  According to the tenth aspect of the present invention, it is possible to provide a small and low-cost position detection method capable of finely specifying indoor position information.

According to the present invention, the optical ID tag device includes a storage unit that stores ID information, an optical transmission unit, and a state detection unit that detects a state of a measurement target. Receiving means for receiving an optical signal, direction detecting means for detecting the incident direction of the optical signal, and a position detecting device calculated from at least ID information, incident direction information and ID information of the received optical signal, and detected motion state information Information management means for managing relative position information from the detection device of the optical ID tag device, control calculation means for specifying the position of the optical ID tag device by calculating relative position information managed by the information management means, In addition, since the optical ID tag device and the communication means for connecting to the network are provided, it is possible to achieve a small size and low cost by which the indoor location information can be specified finely.
The relative position information represents the position information of the optical ID tag device when the position detection device is set as the origin in the detected position information. The arrangement information is information indicating the installation position of the position detection device in the building or the like, and the position information is the position information in the building of the optical ID tag device by the relative position information + arrangement information.

An embodiment of an optical position detection system according to the present invention will be described with reference to the drawings.
(Constitution)
FIG. 1 is a schematic diagram of an embodiment of an optical position detection system according to the present invention.
In FIG. 1, in the present embodiment, the user 15 side to be measured is attached with the optical ID tag device 10.
The optical ID tag device 10 has a light transmitting means 11 that has a light emitting element such as an infrared LED and performs transmission control, and further includes a state detecting means 14 including a sensor for detecting acceleration and vibration, and a user operation state. Information storage means 13 for storing corresponding parameters and tag ID information, and further, a first control for controlling these means and performing calculation and communication control for estimating the state of the user 15 from the output from the state detection means It has a calculation means 12 (power supply such as a battery is omitted).

In this embodiment, for example, the optical ID tag device 10 transmits an optical signal like an optical beacon periodically or irregularly in response to the output of the state detection means.
In addition, the position detection device 1 used in the optical position detection system according to the present invention is installed in a structure such as a ceiling. Further, as shown in FIG. 1, the position detection device 1 includes a receiving means 5a for receiving an optical signal, a light receiving means 5 comprising a tag direction determining means 5b for detecting and calculating the incident direction of the optical signal, An information storage means 2 for storing information, a communication means 3 for transmitting / receiving various information to / from the network, and a second control operation means 4 for controlling each means and calculating various information (power supply is In the case of ceiling installation, it is supplied from a power line, etc., but is omitted here).

FIG. 2 is a schematic view showing an embodiment of a light receiving means used in the optical position detection system shown in FIG.
As the tag direction calculation means 5b, for example, as shown in FIG. 2, a light receiving capable of detecting a spot position within a light receiving surface of incident light such as a spot light position detecting element (hereinafter referred to as PSD) placed at the focal position of the lens 20 is possible. Using the element 21, each PSD output is amplified, and after noise removal, the analog output circuit converts the voltage output in proportion to the spot position (exactly the surface coordinates [light receiving surface center is the origin] x ′, y ′) to AD. And the direction vector value indicating the incident direction is calculated from the focus information of the optical system 20 used.

When the spot position is (xp, yp) and the focal length is f, the direction vector V can be obtained as in the following equation (1).
V = (xp, yp, −f) (1)

Further, in the case of the present embodiment, the output from the PSD 21 is added (summed), and then the demodulating means 22 is used to demodulate the received data. Here, the addition (summation) simply means that the PSD outputs are combined.

FIG. 3 is a diagram showing an example of the configuration of an optical ID tag signal of the optical ID tag device used in the optical position detection system shown in FIG.
As shown in FIG. 3, the optical ID tag signal is composed of, for example, a preamplifier 25 for synchronization signal, tag ID number information 26, a data signal 27, and a CR signal 28 indicating the end of communication. Modulation transmission) by a method using an infrared communication system such as a modulation system).

FIG. 4 is a block diagram around the state detection means used in the optical ID tag device of the optical position detection system shown in FIG.
As data to the data unit 27, for example, as shown in FIG. 4, each sensor output in the state detection means 14 (acceleration sensor and vibration sensor direction sensor output in this embodiment) is converted into digital data and then used as a control calculation means. The state of the user is determined, the value of the state parameter corresponding to the determination is adopted as data, set in the data portion, and transmitted. For example, when considering the two states shown in Table 1 as parameters, if each output is larger than a predetermined threshold, it is determined as a walking motion state, and 1 is set as the parameter value. In this case, it is determined that the camera is stationary, and 0 is set as a parameter value in the data portion. Furthermore, it is also possible to prepare parameters such as a state in which the user is lying down or seated by combining the values of the sensors.

Furthermore, it is also possible to determine the state with higher accuracy by performing an inference operation using each sensor output value as an input using a neural network method or a phage inference method, which are existing estimation methods.
By receiving the tag ID information and the data content from the optical signal received by the optical receiving means 5a, the position of the optical ID tag and the user can be specified.
The optical receiving means 5a specifies the position of the optical ID tag device 10 and the user based on the tag information and data contents of the optical signal received from the optical ID tag device 10.

(Position calculation)
FIG. 5 is an explanatory diagram for explaining the operation of the optical position detection system shown in FIG.
FIG. 5 shows a method of calculating the relative position of the optical ID tag device position of the optical ID tag device 10 from the position detection device 1 (here, the light emitting point of the light emitting element is adopted as position information).
In the present embodiment, when a coordinate system as shown in the figure is considered with the optical center of the optical system of the light receiving means of the position detecting device 1 as the origin of relative coordinates, the light emitting point 43 of the optical ID tag device reaches the position detecting device 1. Since the incident light can be regarded as almost parallel light when the distance is sufficiently short, the incident direction vector obtained by the above method by the light receiving means in the apparatus 1 indicates the direction of the light emitting point 43.
Here, the relative coordinates mean a coordinate system with the optical center of the light receiving device of the position detecting device as the origin. That is, it means a detection position of the optical ID tag device indicated by a coordinate system in which the position detection device is arranged at the origin.

  Therefore, when the incident direction vector obtained from the light receiving means of the position detection device 1 is V, the distance from the position detection device 1 to the floor 42 is H, and the distance from the floor of the tag is d, only the distance d from the floor is obtained. Relative coordinate values can be obtained as the intersections between the separated parallel surface 41 and the straight line 45 passing through the origin parallel to the vector V.

In addition, the height H of the floor surface and the apparatus 1 which is a parameter necessary for position calculation by the above method is obtained by subtracting the height of the apparatus 1 from the distance between the ceiling surface 40 and the floor surface 42 of a normal building. A value may be used, and since the height of the apparatus 1 is sufficiently shorter than the height from the floor surface to the ceiling, the distance between the floor surface and the ceiling may be used as it is. Further, the distance d between the floor surface 42 and the optical ID tag device varies depending on the posture of the user 15, but for each state parameter estimated by the state detection unit, the distance d is stored in advance in the information storage unit 2 in the position detection device 1. The light emission point 43 is calculated by storing the value and using the value corresponding to the received posture parameter 31.
Here, the attitude parameter 31 is set by the transmitting means in the data 27 shown in FIG. 3 with reference to the output of the state detecting means of the optical ID tag device, transmitted from the optical ID tag device, and the optical signal is received. The position detection apparatus that has demodulated the received signal acquires attitude parameter information from the data following the tag ID information.

FIG. 6 is a diagram showing the relationship between the optical position detection system shown in FIG. 1 and a network.
Further, as shown in FIG. 6, the position detection device 1 is connected to the network 50. For example, an ID is assigned by a dedicated position detection server 51 and is managed by the database 53 together with the arrangement position information indicating the arrangement position. The position of the optical ID tag within the range managed by the server 51 when the position detection server 51 acquires the information by adding the arrangement information of the position detection device 1 indicating the relative position information of the optical ID tag device 10 Can be determined, and various services using the arrangement position information of the position detection device 1 can be provided using the server information.

  Further, various height parameters of H and d may be individually set in the optical ID tag device 10 and the position detection device 1, but for example, the height parameter H is the layout of the building design CAD data and the position detection device 1. By registering information in the database 53, it is possible to easily set the information in each position detection device 1 in advance through a network.

  Also, the distance parameter d corresponding to the posture parameter can be easily transmitted to each position apparatus 1 through the network in the same manner as the height parameter H by registering the tag ID and body data of the optical ID tag wearer 15 in the database. It can also be set in advance remotely.

  In particular, when considering a system that does not require high accuracy, practical accuracy can be secured even if d is set as a constant group as average attitude data.

FIG. 7 is a conceptual diagram showing another embodiment of the optical ID tag device used in the optical position detection system shown in FIG.
Further, as shown in FIG. 7, distance measuring means 56 may be provided in the optical ID tag device, and distance measurement data measured thereby may be used. As the distance measuring means, for example, an active focus method of a camera using infrared rays or a method of calculating from the reflection propagation time of ultrasonic waves may be used.

(Multiple tag processing example)
FIG. 8 is an explanatory diagram when the optical ID tag devices 10a and 10b exist in the same position detection area in the optical position detection system shown in FIG.
As shown in FIG. 8, the optical receiving unit 61 is provided in each of the optical ID tag devices 10 a and 10 b, and the optical transmitting unit 60 is installed in the position detection device 1. For this reason, for example, when the position detection means 1 detects an optical signal, the signal is evaluated. If the signal is not a prescribed signal (for example, the signal strength is sufficient but demodulation is failed or data contained in the demodulated signal is For example, if the optical signal from the tag has a collision, the transmitting unit 60 transmits a predetermined signal to the optical receiving unit 61, and each optical ID tag device 10a, 10b transmits a signal. If received, the optical signal is retransmitted at a random time interval designated by the retransmission control means 62.

  The position detection device 1 recognizes each optical ID tag device in the detection area by receiving the optical signal, and then the optical transmission means 60 designates a plurality of light emission timings for each optical ID tag device. Avoid collision and position detection of optical signals from the optical ID tag device.

  Also, since each optical ID tag device is provided with an optical receiving means 61, the optical ID tag device itself receives and evaluates the presence or absence of an optical signal other than itself before transmission, and at the timing when the optical signal is not transmitted. It is also possible to avoid a collision by transmitting a signal. That is, in these two examples, the former is a position device, and the latter is a tag side where the collision avoidance and transmission timing control are mainly performed. In both examples, the same effect can be obtained.

  The present invention is not limited to the above embodiment, and various modifications are possible. For example, a PD array can be used instead of the PSD device as the light receiving means. Furthermore, an image sensor used for a digital camera or the like can also be used. In this case, it is desirable to provide a separate light receiving element for receiving an optical signal. Also, the output information from the state detection means may be used for communication control of the optical ID tag device. For example, when the sensor output is below a threshold for a certain time, the light transmission means is paused, or conversely the walking state is estimated. To reduce the power consumption of the optical ID tag device and improve the battery operating time by setting the transmission interval shorter when the user is seated, or by setting the transmission interval longer when the seated state is estimated. Is also possible.

〔effect〕
(1) According to the present invention, it is possible to provide a small and low-cost position detection system capable of finely specifying indoor position information.

(2) According to the present invention, it is possible to detect a plurality of optical ID tags in the same detection area, and to realize power saving of the optical ID tag.

(3) According to the present invention, it is possible to detect the motion state of the measurement target and to improve the accuracy of position measurement.

  It can be used for a system that provides a service based on user location information.

1 is a schematic diagram of an embodiment of an optical position detection system according to the present invention. It is the schematic which shows one Embodiment of the light-receiving means used for the optical position detection system shown in FIG. It is a figure which shows an example of a structure of the optical ID tag signal of the optical ID tag apparatus used for the optical position detection system shown in FIG. FIG. 2 is a block diagram around a state detection unit used in the optical ID tag device of the optical position detection system shown in FIG. 1. It is explanatory drawing for demonstrating operation | movement of the optical position detection system shown in FIG. It is a figure which shows the relationship between the optical position detection system shown in FIG. 1, and a network. It is a conceptual diagram which shows other embodiment of the optical ID tag apparatus used for the optical position detection system shown in FIG. In the optical position detection system shown in FIG. 1, it is explanatory drawing in case a plurality of optical ID tag devices exist in the same detection area. It is a figure which shows the prior art example of an optical position detection system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Position detection apparatus 2 Information storage means 3 Communication means 4 2nd control calculation means 5 Light reception means 5a Reception means 5b Tag direction determination means 10 Optical ID tag apparatus 11 Optical transmission means 12 First control calculation means 13 Information storage means 14 State detection means 15 user

Claims (10)

A position detection system comprising at least an optical ID tag device installed in a measurement target and a position detection device connectable to a network,
The optical ID tag device has storage means for storing ID information, optical transmission means, and state detection means for detecting the state of the measurement target,
The position detecting device includes a receiving unit that receives an optical signal from the optical ID tag device, a direction detecting unit that detects an incident direction of the optical signal, and at least the ID information and the optical signal received by the position detecting device. Information management means for managing the relative position information from the detection device of the optical ID tag device calculated from the incident direction information and the ID information and the state information of the detected motion, managed by the information management means An optical position detection system comprising: control calculation means for specifying the position of the optical ID tag device by calculating relative position information; and communication means for connecting the optical ID tag device to a network. A position detection system comprising at least an optical ID tag device installed on a measurement object and a position detection device connectable to a network,
The optical ID tag device includes storage means for storing at least uniquely determined ID information, optical transmission means for transmitting ID information stored in the storage, state detection means for detecting at least the posture or motion state of the measurement target, and Have
The position detecting device includes a receiving unit that receives an optical signal from the optical ID tag device, and a direction detecting unit that detects an incident direction of the received signal light, and the position detecting device is at least the ID Information management means for managing relative position information from the detection device of the optical ID tag device calculated from the information, the incident direction information of the received optical signal, and the ID information and detected motion state information; Position detection comprising control calculation means for specifying the position of the optical ID tag device by calculating relative position information managed by the information management means, and communication means for connecting to the optical ID tag device and a network An optical position detection system comprising an apparatus.   The position detecting device has ID information that is uniquely determined, and has means for storing the ID information and arrangement information of the position detecting device corresponding to the ID information, and further includes the arrangement information and the position 3. A control means for calculating position information of the optical ID tag device based on detection position information of the optical ID tag device calculated by the position detection device specified by information. The optical position detection system described.   3. The optical position detection system according to claim 1, wherein the optical ID tag apparatus has an optical receiving means and the position detection apparatus has an optical transmission means.   The optical ID tag device has optical receiving means, and the optical ID tag device has control means for performing communication control for avoiding collision of optical signals with other optical ID tag devices. The optical position detection system according to claim 1 or 2.   3. The optical position detection system according to claim 1, wherein the state detection means provided in the optical ID tag device has at least one sensor element for detecting a physical quantity such as vibration, acceleration, and geomagnetism.   3. The optical position detection system according to claim 1, wherein the optical ID tag device has a distance measuring means. An optical ID tag device of a position detection system comprising at least an optical ID tag device installed in a measurement target and a position detection device connectable to a network,
An optical ID tag device comprising storage means for storing ID information, optical transmission means, and state detection means for detecting a state of a measurement object. A position detection device of a position detection system comprising at least an optical ID tag device installed in a measurement target and a position detection device connectable to a network,
Receiving means for receiving an optical signal from the optical ID tag device, direction detecting means for detecting an incident direction of the optical signal, at least the ID information by the position detecting device, incident direction information of the received optical signal, the ID By calculating relative position information managed by the information management means, information management means for managing relative position information from the detection device of the optical ID tag device calculated from information and detected motion state information A position detection apparatus comprising: control calculation means for specifying the position of the optical ID tag apparatus; and communication means for connecting the optical ID tag apparatus to a network. A position detection method in a position detection system comprising at least an optical ID tag device installed on a measurement target and a position detection device connectable to a network,
The optical ID tag device stores at least uniquely determined ID information, transmits the stored ID information, detects at least the posture or movement state of the measurement target,
The position detection device receives an optical signal from the optical ID tag device, detects an incident direction of the received signal light, and the position detection device at least receives the ID information and an incident direction of the received optical signal. Information, and the relative position information from the detection device of the optical ID tag device calculated from the ID information and detected motion state information is managed, and the relative position information managed by the information management means is calculated. The position of the optical ID tag device is specified by this, and the optical ID tag device is connected to the network.

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