JP2009063323A - Human detection device, method and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a human detection device, a method and a program, capable of detecting a human, even when a person is standing still. <P>SOLUTION: This human detection device for determining the presence of a person is equipped with an objective lens 10 for condensing infrared rays emitted from the person, an infrared sensor 20 for detecting the infrared rays condensed by the objective lens 10, and a driving mechanism 30 for repeatedly moving relatively the objective lens 10 and the infrared sensor 20. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a human detection apparatus, method, and program for determining the presence or absence of a person.

  In elderly welfare facilities and the like, it is important to grasp the living behavior pattern through the presence / absence of service users (hereinafter referred to as “users”) in order to manage the health status of users. For example, if the user is active such as taking a walk out of the room, the health condition is good and the risk of lifestyle-related diseases is low.

Conventionally, a device for detecting a person using a pyroelectric infrared sensor that detects infrared rays emitted from a human body has been developed (for example, Patent Document 1), but the pyroelectric infrared sensor responds to changes in infrared rays. Because it has the property of outputting a signal, if the person continues to receive a certain infrared ray, such as when the person is sleeping or staying on a toilet, the signal corresponding to the infrared ray will not be output and the person will be detected You can't do that either.
Japanese Patent No. 3577212 JP 2007-101483 A

  In response to such a problem, for example, in Patent Document 2, the infrared sensor is vibrated by a drive mechanism, and the infrared ray incident on the infrared sensor is changed to detect the person even when the person is stationary. A human detection device that can do this is disclosed.

  On the other hand, the present invention is a case where a person is stationary by relatively vibrating the objective lens and the infrared sensor by the drive mechanism and changing the infrared ray incident on the infrared sensor. Another object of the present invention is to provide a human detection device, method and program capable of detecting a person.

1st invention is a person detection device which judges existence of a person,
An objective lens that focuses infrared rays emitted from humans;
An infrared sensor for detecting infrared rays focused by the objective lens;
A drive mechanism for repeatedly moving the objective lens and the infrared sensor repeatedly;
It is a person detection apparatus characterized by providing.

A second invention is the human detection device according to the first invention,
A drive control unit is provided that operates the drive mechanism when infrared rays are detected by the infrared sensor in a state where the operation of the drive mechanism is stopped, and stops the operation of the drive mechanism when infrared rays are not detected for a predetermined time. This is a human detection device.

3rd invention is the human detection apparatus as described in 1st or 2nd invention, Comprising:
The drive control unit is a human detection device that operates the drive mechanism at predetermined time intervals.

A fourth invention is the human detection device according to the third invention, wherein
The human detection device includes a determination unit that determines the presence or absence of a person based on a detection result of the infrared sensor and an operating state of the drive mechanism.

A fifth invention is the human detection device according to the fourth invention,
When the determination unit determines that there is a person, the determination unit determines the movement of the existing person based on the detection result of the infrared sensor and the operating state of the drive mechanism. It is a detection device.

A sixth invention is the human detection device according to any one of the first to fifth inventions,
The drive mechanism is a human detection device that operates the objective lens on a predetermined plane that is perpendicular to a directivity direction of the infrared sensor.

A seventh invention is the human detection device according to any one of the first to fifth inventions,
The drive mechanism operates the objective lens so as to change the distance between the infrared sensor and the objective lens.

An eighth invention is the human detection device according to any one of the first to seventh inventions,
In the human detection device, the objective lens may be a fullnel lens.

  According to the present invention, it is possible to provide a human detection device, method and program capable of detecting a human even when the human is stationary.

  FIG. 1 is a configuration diagram showing a human detection device 1 according to an embodiment of the present invention. As shown in the figure, the human detection device 1 includes an objective lens 10, an infrared sensor 20, a drive mechanism 30, a drive control unit 40, a determination unit 50, and the like.

  The objective lens 10 is a lens that focuses infrared rays from the detection target range onto the light receiving surface of the infrared sensor 20. The objective lens 10 is supported by support members 12 and 14 from both upper and lower (or left and right) sides in FIG. 1, and the support member 12 is supported to be swingable about a fulcrum 16.

  The infrared sensor 20 is a sensor that detects infrared rays focused by the objective lens 10, and is, for example, a pyroelectric infrared sensor. Since the infrared sensor 20 has a characteristic of outputting a signal corresponding to a change in the received infrared ray, the infrared ray cannot be detected if a state where a certain infrared ray is incident continues. On the other hand, in this embodiment, the objective lens 10 is vibrated by the drive mechanism 30 as will be described later, and the relative position with respect to the infrared sensor 20 is repeatedly changed. Change. Thereby, even when a person in the detection target range is stationary, the amount of infrared light incident on the infrared sensor 20 changes, so that the infrared light emitted from the person can be detected.

  The drive mechanism 30 is a mechanism that drives the objective lens 10 by electromagnetic force, for example. Specifically, the drive mechanism 30 includes an electromagnet 32, and the magnetic member 33 connected to the support member 14 is attracted to the electromagnet 32 by a magnetic attraction generated by energizing the coil 31 of the electromagnet 32. Thereby, the support member 14 and the objective lens 10 supported by the support member 14 rotate about the fulcrum 16 as an axis.

  The drive mechanism 30 includes an elastic body 34 such as a spring that applies a force opposite to the magnetic attraction force by the electromagnet 32 to the support member 14, and stops the energization of the coil 31 to stop the electromagnet. When the electromagnetic attraction force by 32 no longer acts on the support member 14, the support member 14 is moved in the direction opposite to the attraction direction by the electromagnet 32 by the elastic force of the elastic body 34, and accordingly, the objective lens 10 is a fulcrum. 16 is rotated in the opposite direction to that when the coil 31 is energized to return to the original position. In this manner, by repeating energization and deactivation of the coil 31, the objective lens 10 can be swung with the fulcrum 16 as a fulcrum. That is, by swinging the objective lens 10, the objective lens 10 can be repeatedly relatively moved with respect to the infrared sensor 20 so that the interval thereof changes.

  The magnetic member 33 may be formed of a permanent magnet, and the drive mechanism 30 may be configured to swing the objective lens 10 using the magnetic repulsive force between the magnetic member 33 and the electromagnet 32.

  Furthermore, the drive mechanism 30 includes an adjustment unit 35 for adjusting the drive range of the objective lens 10. The adjusting means 35 is configured by a nut 37 provided at a fixed position and a bolt 36 screwed to the nut 37, and the tip of the bolt 36 abuts on the support member 14, so that the driving range of the support member 14 is increased. regulate. Accordingly, the driving range of the objective lens 10 can be adjusted by rotating the bolt 36 screwed into the nut 37 to change its position.

  When the infrared ray is detected by the infrared sensor 20, the drive control unit 40 repeatedly drives the objective lens 10 by the drive mechanism 30 at a predetermined time interval (for example, drives for 10 seconds and repeats the stop for 50 seconds). On the other hand, when infrared rays are not detected by the infrared sensor 20 for a predetermined time (for example, the past one minute), the driving of the objective lens 10 by the drive mechanism 30 is stopped and the stopped state is maintained. This is because if there is no infrared ray detected in the past minute, it is considered that there is little possibility that a person exists, and if there is no person, there is no point in driving the objective lens 10. This is to prevent unnecessary driving. When infrared rays are detected again, the objective lens 10 is repeatedly driven by the drive mechanism 30 at a predetermined time interval (for example, driven for 10 seconds and repeatedly stopped for 50 seconds).

  Based on the detection result of the infrared sensor 20 and the operating state of the drive mechanism 30, the determination unit 50 determines the presence / absence of a person and whether the person is moving. That is, regardless of the operating state of the drive mechanism 30, if the infrared sensor 20 does not detect infrared light having a predetermined intensity or more, it is determined that there is no person. The determination unit 50 determines that a person is moving when the infrared sensor 20 detects an infrared ray having a predetermined intensity or more when the drive mechanism 30 is not operating, and the drive mechanism 30 is operating. In the case where the infrared sensor 20 detects an infrared ray having a predetermined intensity or higher and the infrared sensor 20 does not detect an infrared ray having a predetermined intensity or higher when the drive mechanism 30 is not operated, it is determined that the person is stationary without moving. .

  The above determination by the determination unit 50 may be performed every certain time (for example, every minute). That is, for example, based on the detection result of the infrared sensor 20 for 10 seconds during which the objective lens 10 is driven in one minute and the detection result of the infrared sensor 20 for 50 seconds when the objective lens 10 is not driven, The presence / absence and movement of a person may be determined.

  In addition, the drive control part 40 and the determination part 50 are implement | achieved when CPU with which a computer is provided reads and runs the program memorize | stored in the memory | storage means, for example.

  FIG. 2 is a flowchart showing the control process of the drive control unit 40 and the determination process of the determination unit 50. The control process of the drive control unit 40 and the determination process of the determination unit 50 are performed as shown in FIG. 2 is activated at predetermined time intervals (in this example, every other minute), and at the time of activation, driving of the objective lens 10 by the drive control unit 40 is stopped. To do.

  First, when the infrared sensor 20 has detected an infrared ray having a predetermined intensity or more in the past one minute (S202: YES), the drive control unit 40 drives the objective lens 10 for 10 seconds (S204), and then for 50 seconds. The drive control unit 40 stops driving the objective lens 10 (S206). When the infrared sensor 20 detects an infrared ray with a predetermined intensity or higher during driving in S204 (S208: YES), and when the infrared sensor 20 detects an infrared ray with a predetermined intensity or higher while the driving is stopped in S206 (S210: YES), the determination unit 50 determines that a person exists and is stationary (S212). In addition, when the infrared sensor 20 detects an infrared ray with a predetermined intensity or higher during driving in S204 (S208: YES), the infrared sensor 20 detects an infrared ray with a predetermined intensity or higher while the driving is stopped in S206. If not (S210: NO), the determination unit 50 determines that a person exists and is stationary (S214).

  On the other hand, when the infrared sensor 20 does not detect infrared rays with a predetermined intensity or higher during driving in S204 (S208: NO), the infrared sensor 20 detects infrared rays with a predetermined intensity or higher while driving is stopped in S206. Is detected (S216: YES), there is no person during the driving in S204, but there is a new person during the driving stop in S206. It is determined that the person exists and is moving (S214). In addition, when the infrared sensor 20 does not detect infrared rays having a predetermined intensity or higher during driving in S204 (S208: NO), the infrared sensor 20 detects infrared rays having a predetermined intensity or higher while driving is stopped in S206. If it is not detected (S216: NO), the determination unit 50 determines that no person exists after the previous detection (S220).

  If the infrared sensor 20 has not detected an infrared ray having a predetermined intensity or more in the past minute (S202: NO), the drive control unit 40 maintains a state where the driving of the objective lens 10 is stopped (S220). When the infrared sensor 20 detects an infrared ray having a predetermined intensity or more while driving is stopped (S224: YES), it is a case where a person is newly entering the detection range of the human detection device 1 and moving. 50 determines that a person is present and moving (S214). On the other hand, when the infrared sensor 20 does not detect infrared rays with a predetermined intensity or higher during driving stop (S222: NO), the determination unit 50 determines that there is no person (S214).

  Next, an example of the determination result when the human detection device 1 determines the presence / absence status of a person in a room according to the processing flow of FIG. 2 will be described. FIG. 3 is a diagram illustrating an example of determination results related to the presence / absence and movement of a person by the human detection device 1 with respect to the presence / absence and movement of an actual person. Here, the presence / absence and movement of the person to be detected every 10 seconds are as shown in FIG. As described above, the processing flow of FIG. 2 is started at intervals of 1 minute, and the drive control unit 40 drives the objective lens 10 for 10 seconds, and then drives unless the infrared ray is not detected in the previous 1 minute. To stop.

  First, before 23:10, since the infrared sensor 20 does not detect infrared rays regardless of whether the objective lens 10 is driven or stopped, the determination unit 50 determines that “no person exists”.

  Next, the infrared sensor 20 detects infrared rays at 23:10:30. In this case, since the infrared sensor 20 detects infrared rays when the objective lens 10 is stationary, the determination unit 50 determines that “a person is present from 23: 10: 0 to 23: 11: 0. It is determined that it is moving.

  Further, since the infrared sensor 20 detects the infrared ray from 23:10:10 to 23: 11: 0, the drive controller 40 detects the next 10 seconds (from 23: 11: 0 to 23:00). 11 minutes and 10 seconds), the objective lens 10 is driven by the drive mechanism 30. The infrared sensor 20 detects infrared rays while driving the objective lens 10 and detects infrared rays even after the drive is stopped at 23:11:10. Therefore, the determination unit 50 determines that “a person is present and moving” for one minute from 23: 11: 0 to 23: 12: 0.

  While the infrared sensor 20 drives the objective lens 10 from 23: 12: 0 to 23:12:10, the infrared sensor 20 detects infrared rays, but from 23:12:10 Infrared rays are not detected while driving of the objective lens 10 is stopped until 23: 13: 0. Therefore, the determination unit 50 determines that “the person exists but is stationary”.

  The infrared sensor 20 detects infrared rays while the objective lens 10 is being driven from 23: 13: 0 to 23:13:10, and from 23:13:10 to 23. Infrared light is also detected while driving of the objective lens 10 is stopped until 13:40 hours. Therefore, the determination unit 50 determines that “a person exists and moves”.

  While the infrared sensor 20 is driving the objective lens 10 from 23: 14: 0 to 23:14:10, the infrared sensor 20 is operated from 23:13:10 to 23: 14: 0. While the driving is stopped, the infrared sensor 20 does not detect infrared rays. Therefore, the determination unit 50 determines that “no person exists”.

  In addition, since the infrared sensor 20 did not detect the infrared ray for one minute from 23: 14: 0 to 23: 15: 0, the drive control unit 40 thereafter until the infrared sensor 20 detects the infrared ray again. The objective lens 10 is not driven and the stopped state is maintained.

  As described above, the presence / absence and movement of a person can be determined by the human detection device 1.

  FIG. 4 is a conceptual diagram showing a human detection device 2 which is another embodiment of the present invention. The human detection device 2 is different from the human detection device 1 shown in FIG. That is, in the human detection device 2, the objective lens 10 is driven by the drive mechanism 30 in a direction perpendicular to the directivity direction of the infrared sensor 20. The magnetic member 33 may be formed of a permanent magnet, and the drive mechanism 30 may be configured to swing the objective lens 10 using the magnetic repulsive force between the magnetic member 33 and the electromagnet 32.

  As the objective lens 10, it is preferable to use a Fresnel lens having directivity characteristics as exemplified in FIGS. In the same figure, it is shown that the larger the fan-shaped radius extending from the Fresnel lens center O, the higher the sensitivity to infrared rays from that direction. It can be seen from the characteristics shown in the figure that the infrared ray incident on the infrared sensor 20 changes greatly only by slightly changing the position of the objective lens 10. Accordingly, when the orientation of the objective lens 10 is repeatedly changed as in the embodiment shown in FIG. 1 or FIG. 4, the infrared ray incident on the infrared sensor 20 changes significantly, so that the infrared ray emitted by the person is constant when the person is stationary. Even in the case where it is kept at the same level, the infrared rays can be detected more reliably.

  As described above, according to the human detection device 1 or the human detection device 2, it is possible to detect a person regardless of whether the person is moving or stationary. In other words, if the person is moving, the amount and direction of infrared rays incident on the infrared sensor 20 change, so the infrared sensor 20 can detect infrared rays. Further, even when a person is stationary, the infrared light incident on the infrared sensor 20 can be changed by driving the objective lens 10 by the drive mechanism 30, and the infrared sensor 20 detects the infrared light. Can do.

  When the infrared sensor 20 detects infrared rays, it can be determined that a person is present, but based on the operating state of the drive mechanism 30, it can be determined whether the person is moving or stationary. That is, if the infrared sensor 20 detects infrared rays when the drive mechanism 30 stops driving, it can be determined that a person is moving. In addition, when the drive mechanism 30 stops driving, the infrared sensor 20 does not detect infrared rays, but when the drive mechanism 30 is driven, if the infrared sensor 20 detects infrared rays, the person stops. Can be determined.

  Further, the human detection devices 1 and 2 can be used for energy saving by being used in combination with a television receiver, for example. That is, when the human detection devices 1 and 2 are installed with the range in which the screen of the television receiver can be viewed as a detection range, and the human detection devices 1 and 2 determine that there is no person, the television receiver Can be turned off (or only the screen is turned off). In other words, when the human detection devices 1 and 2 determine that no person exists, no one is watching the TV, and thus it is possible to save electricity by turning off the TV.

  In addition, the description of the above embodiment is for facilitating understanding of the present invention, and does not limit the present invention. It goes without saying that the present invention can be changed and improved without departing from the gist thereof, and that the present invention includes equivalents thereof.

  For example, in the above embodiment, the objective lens 10 is driven to move the objective lens 10 and the infrared sensor 20 relative to each other. However, the configuration is not limited thereto, and the infrared sensor 20 may be driven.

It is a lineblock diagram showing person detection device 1 which is one embodiment of the present invention. FIG. 5 is a flowchart showing a control process in a drive control unit 40 and a determination process in a determination unit 50. It is a figure which shows the example of the determination result which concerns on the presence or absence and movement of a person of the human detection apparatus 1 with respect to an actual presence or absence and movement of a person. It is a conceptual diagram which shows the person detection apparatus 1 which is one Embodiment of this invention. It is a figure which shows the directivity of a Fresnel lens.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 2 Person detection apparatus 10 Objective lens 12, 14 Support member 16 Support point 20 Infrared sensor 30 Driving mechanism 31 Coil 32 Electromagnet 33 Magnetic member 34 Elastic body 35 Adjustment means 36 Bolt 37 Nut 40 Drive control part 50 Determination part

Claims (10)

A human detection device for determining the presence or absence of a person,
An objective lens that focuses infrared rays emitted from humans;
An infrared sensor for detecting infrared rays focused by the objective lens;
A drive mechanism for repeatedly moving the objective lens and the infrared sensor repeatedly;
A human detection device comprising: The human detection device according to claim 1,
A drive control unit is provided that operates the drive mechanism when infrared rays are detected by the infrared sensor in a state where the operation of the drive mechanism is stopped, and stops the operation of the drive mechanism when infrared rays are not detected for a predetermined time. A human detection device characterized by that. The human detection device according to claim 1 or 2,
The drive control unit operates the drive mechanism at a predetermined time interval. The human detection device according to claim 3,
A human detection apparatus comprising: a determination unit that determines the presence or absence of a person based on a detection result of the infrared sensor and an operating state of the drive mechanism. The human detection device according to claim 4,
When the determination unit determines that there is a person, the determination unit determines the movement of the existing person based on the detection result of the infrared sensor and the operating state of the drive mechanism. Detection device. The human detection device according to claim 1,
The human detection device, wherein the drive mechanism operates the objective lens on a predetermined plane perpendicular to a directivity direction of the infrared sensor. The human detection device according to claim 1,
The human detection device, wherein the driving mechanism operates the objective lens so as to change a distance between the infrared sensor and the objective lens. The human detection device according to claim 1,
The human detection apparatus, wherein the objective lens is a fullnel lens. Based on an objective lens that focuses infrared rays emitted from a person, an infrared sensor that detects infrared rays focused by the objective lens, a drive mechanism that repeatedly moves the objective lens and the infrared sensor repeatedly, and a detection result of the infrared sensor A method for determining the presence or absence of a person using a human detection device comprising a computer for controlling the drive mechanism,
The computer is
Activating the drive mechanism when infrared is detected by the infrared sensor in a state where the operation of the drive mechanism is stopped;
A step of stopping the operation of the drive mechanism if infrared light is not detected in a state where the drive mechanism is operating;
Determining the presence or absence of a person based on the detection result of the infrared sensor and the operating status of the drive mechanism;
In the case where it is determined that the person exists, the step of determining the movement of the existing person based on the detection result of the infrared sensor and the operating state of the drive mechanism;
The person detection method characterized by performing. Based on an objective lens that focuses infrared rays emitted from a person, an infrared sensor that detects infrared rays focused by the objective lens, a drive mechanism that repeatedly moves the objective lens and the infrared sensor repeatedly, and a detection result of the infrared sensor A determination program for the presence or absence of a person using a human detection device comprising a computer for controlling the drive mechanism,
In the computer,
Activating the drive mechanism when infrared is detected by the infrared sensor in a state where the operation of the drive mechanism is stopped;
A step of stopping the operation of the drive mechanism if infrared light is not detected in a state where the drive mechanism is operating;
Determining the presence or absence of a person based on the detection result of the infrared sensor and the operating status of the drive mechanism;
In the case where it is determined that the person exists, the step of determining the movement of the existing person based on the detection result of the infrared sensor and the operating state of the drive mechanism;
A human detection program characterized by executing