JP2020051757A - Person detection system and program - Google Patents

Abstract

To provide a person detection system and a program capable of detecting a movement of a human body between two detection areas.SOLUTION: A person detection system 1 includes a determination part 320. The determination part 320 receives a signal from a first pyroelectric sensor 11 which is used for detecting a human body in a first detection area and a signal from a second pyroelectric sensor 12 which is used for the detection of a human body in a second detection area. The second detection area includes at least a part of the area around the first detection area. The determination part 320 determines the existence of a human body in the first detection area by using at least an output value from the first pyroelectric sensor 11. The determination part 320 determines a leaving of the human body from the first detection area by using at least an output value from the second pyroelectric sensor 12.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates generally to human detection systems and programs, and more particularly to human detection systems and programs that detect the presence or absence of a person.

  2. Description of the Related Art Conventionally, a system for detecting whether or not a human body exists in a predetermined area is known (for example, see Patent Document 1).

  The infrared detection system described in Patent Document 1 has two light receiving units, a multiplying unit, an integrating unit, and a determining unit. Each light receiving unit outputs an output signal corresponding to a change in the intensity of infrared light received from the detection space. The multiplication unit multiplies the output signal output from each light receiving unit. The integrator integrates the multiplication result of the multiplier. The determination unit compares the integration result of the integration unit with the first determination threshold, and determines that a person is present (stays) in the detection space if the integration result is equal to or greater than the first determination threshold.

JP 2017-150909 A

  In a conventional infrared detection system (human detection system), only one detection area is monitored, multiplication processing and integration processing are performed on an output signal, and a state in which the calculation result is less than a threshold continues for a predetermined time or more. Then, it is determined that the human body is absent in the detection area. That is, with the conventional human detection system, it was not possible to detect the leaving movement of the human body from the detection area.

  The present disclosure has been made in view of the above circumstances, and an object of the present disclosure is to provide a human detection system and a program that can detect movement of a human body between two detection areas.

  A human detection system according to an aspect of the present disclosure includes a determination unit. The determination unit receives signals from a first sensor used for detecting a human body in a first detection area and a second sensor used for detecting the human body in a second detection area. The second detection area includes at least a part of the area around the first detection area. The determination unit determines the presence of the human body in the first detection area using at least an output value of the first sensor. The determination unit determines whether the human body has exited from the first detection area using at least an output value of the second sensor.

  A program according to an embodiment of the present disclosure causes a computer to function as the determination unit in the human detection system.

  The present disclosure has an effect that a movement of a human body between two detection areas can be detected.

FIG. 1 is a block diagram illustrating a configuration of a human detection system according to an embodiment of the present disclosure. FIG. 2 is a diagram illustrating an example of use of the above-described human detection system. FIG. 3 is a schematic diagram of a first detection area and four second detection areas in the human detection system according to the first embodiment. FIG. 4 is a diagram illustrating determination of the presence or absence of a person in the first detection area in the above-described human detection system. FIG. 5 is a diagram for explaining changing a stay detection threshold value in the above-described human detection system. FIG. 6 is a diagram illustrating that the stay detection threshold is changed to a larger value in the above-described human detection system. FIG. 7 is a diagram illustrating a configuration of a human detection system according to a modified example of one embodiment of the present disclosure.

  The embodiments and modifications described below are merely examples of the present disclosure, and the present disclosure is not limited to the embodiments and the modifications. Various changes can be made according to the design and the like, other than the embodiment and the modified examples, as long as the technical idea according to the present disclosure is not deviated.

(Embodiment)
Hereinafter, the human detection system 1 according to the present embodiment will be described with reference to FIGS.

(1) Overview The human detection system 1 determines whether or not a human 91 (human body) exists in a first detection area 81 (see FIGS. 2 and 3) set in, for example, a corridor of a building, an office, and a living room of a house. Detect. The human detection system 1 transmits infrared light from the first detection area 81 and a plurality of (here, four) second detection areas 82 (see FIGS. 2 and 3) set around the first detection area 81. The presence or absence of the person 91 in the first detection area 81 is detected based on the change in the received light intensity. That is, the human detection system 1 is configured such that the person 91 enters the first detection area 81 through at least one of the plurality of second detection areas 82, or the plurality of second detection areas 82. The presence or absence of the person 91 in the first detection area 81 is detected from a change in the infrared light reception intensity caused by the withdrawal of the person 91 from the first detection area 81 toward at least one second detection area 82. In addition, the human detection system 1 detects the presence or absence of the person 91 in the first detection area 81 from a change in the intensity of received infrared light caused by a slight movement or a large movement of the person 91 in the first detection area 81. Here, “slight movement” means a relatively small movement of the person 91, such as a fluctuation of the body due to the respiratory movement of the person 91, and a restlessness. In the present embodiment, detecting the presence or absence of the person 91 from a change in the intensity of the infrared light received due to the slight movement of the person 91 in the first detection area 81 is referred to as stay detection. Detecting the presence or absence of the person 91 based on a change in the intensity of infrared light received by the person 91 entering the first detection area 81 through the second detection area 82 is referred to as entry detection. In addition, detecting the presence or absence of the person 91 from the change in the intensity of infrared light received due to the withdrawal of the person 91 from the first detection area 81 toward the second detection area 82 is referred to as withdrawal detection.

  The human detection system 1 detects whether the state of the first detection area 81 is an existing state or an absent state. The “presence state” here is a state in which the person 91 exists in the first detection area 81. The “absence state” is a state in which the person 91 does not exist in the first detection area 81. Therefore, when the person 91 does not exist in the first detection area 81, the detection result of the human detection system 1 is “absent state”. When the person 91 enters the first detection area 81, the detection result of the person detection system 1 changes from “absence state” to “existence state”. Thereafter, while the person 91 is staying in the first detection area 81, the detection result of the human detection system 1 maintains the “existing state”. When the person 91 leaves the first detection area 81, that is, when the person 91 is absent in the first detection area 81, the detection result of the human detection system 1 changes from “existing state” to “absent state”.

  The human detection system 1 has a plurality (here, five) of pyroelectric sensors 10 (see FIG. 1).

  In the present embodiment, as an example, the human detection system 1 can communicate with the illumination control system 40 (see FIG. 1). The lighting control system 40 includes a lighting device 41 (see FIGS. 1 and 2) provided in the first detection area 81, and a control device 42 (see FIG. 1) for controlling the lighting device 41. The human detection system 1 determines whether or not the lighting fixture 41 needs to be turned on based on the detection result of the human detection. The determination result of the human detection system 1 is input to the control device 42. The control device 42 turns on or off the lighting fixture 41 according to the determination result of the human detection system 1. The control device 42 may be a switch that is inserted into a power supply path to the lighting device 41 and that turns on / off the energization of the lighting device 41. As described above, the human detection system 1 according to the present embodiment is used for the illumination control system 40 that controls the lighting apparatus 41 in accordance with the presence or absence of the person 91 in the first detection area 81. That is, in the present embodiment, the first detection region 81 is a control target region for controlling the load (the lighting fixture 41). When the person 91 enters the first detection area 81 through the second detection area 82 and determines that the person 91 is staying in the first detection area 81, the human detection system 1 switches the lighting fixture 41 to the first detection area 81. Turn on. If the person detection system 1 determines that the person 91 has left the first detection area 81 and passed through the second detection area 82 and is not present in the first detection area 81, the lighting apparatus 41 is turned off. Let it. Thereby, useless power consumption due to forgetting to turn off the lighting fixture 41 can be suppressed.

(2) Configuration The human detection system 1 includes a plurality (here, five) of pyroelectric sensors 10 and a detection device 30 as shown in FIG. The plurality of pyroelectric sensors 10 are housed together with the detection device 30 in one housing. The human detection system 1 including the pyroelectric sensor 10 is installed, for example, on a ceiling in a facility, as shown in FIG.

  The five pyroelectric sensors 10 include a first pyroelectric sensor 11 and four second pyroelectric sensors 12 (12a to 12d). The first pyroelectric sensor 11 and each of the second pyroelectric sensors 12 have the same configuration. The first pyroelectric sensor 11 is used for detecting the person 91 in the first detection area 81 (see FIGS. 2 and 3). The second pyroelectric sensor 12 is used for detecting a person 91 in the second detection area 82. Specifically, the second pyroelectric sensors 12a to 12d are used for detecting the person 91 in the second detection areas 82a to 82d (see FIG. 3), respectively.

  In the present embodiment, four second pyroelectric sensors 12a to 12d are arranged around the first pyroelectric sensor 11 at equal intervals. That is, the first pyroelectric sensor 11 is disposed at a position inside the four second pyroelectric sensors 12.

  The first pyroelectric sensor 11 is arranged in a vertical direction. The first pyroelectric sensor 11 receives infrared rays from the first detection area 81. The first detection area 81 has a circular outer shape when viewed from the ceiling side (see FIG. 3).

  Each of the second pyroelectric sensors 12 is arranged to be inclined with respect to the vertical direction and to be directed outwardly on the side opposite to the first pyroelectric sensor 11. The second pyroelectric sensors 12a to 12d receive infrared rays from the second detection areas 82a to 82d, respectively. The second detection areas 82a to 82d have the same shape and include different areas. Each second detection area 82 is a partial area around the first detection area 81. Each second detection area 82 is formed so as to avoid the first detection area 81. That is, each second detection area 82 is adjacent to the first detection area 81 and does not overlap with the first detection area 81. In addition, each second detection area 82 includes an overlap area 820 that overlaps with a part of the area in the adjacent second detection area 82. Each second detection area 82 includes two overlapping areas 820. That is, there are four overlapping regions 820 around the first detection region 81 in which a part of two adjacent second detection regions 82 overlap each other. As shown in FIG. 3, the first detection area 81 is surrounded by an area formed by combining four second detection areas 82a to 82d. The area formed by combining the four second detection areas 82a to 82d has a rectangular outer shape, and has the first detection area 81 inside.

  Therefore, when the person 91 enters the first detection area 81, and when the person 91 leaves the first detection area 81, the person 91 becomes at least one of the second detection areas 82a to 82d. Will pass through.

  Each pyroelectric sensor 10 (the first pyroelectric sensor 11 and the plurality of second pyroelectric sensors 12) includes a light receiving element 101, a conversion circuit 102, an amplification circuit 103, and an A / D converter 104. I have. The light receiving element 101 is a pyroelectric element and outputs a signal (electric signal) corresponding to a change in the intensity of infrared light received from a corresponding detection area. The conversion circuit 102 converts an electric signal output from the light receiving element 101 from a current signal to a voltage signal. The amplification circuit 103 amplifies the voltage signal output from the conversion circuit 102. The A / D converter 104 converts an analog signal (voltage signal) output from the amplifier circuit 103 into a digital signal.

  Each pyroelectric sensor 10 is used in combination with an optical system 15 (see FIG. 2). The optical system 15 includes a lens or a mirror, or a combination thereof, and focuses infrared rays from the first detection area 81 and the second detection areas 82a to 82d on the light receiving elements 101 corresponding to the respective detection areas.

  The detection device 30 includes a plurality of (here, five) pyroelectric buffers 301, a plurality of (here, five) pyroelectric filter units 302, a storage unit 303, a control unit 304, and an output unit. 305.

  A signal from each A / D converter 104 is input to a pyroelectric filter unit 302 via a pyroelectric buffer 301. The pyroelectric filter unit 302 attenuates or amplifies a specific frequency component.

  In the present embodiment, the detection device 30 is configured by, for example, a microcomputer having a processor and a memory. When the processor executes a program stored in the memory, the microcomputer functions as the control unit 304. The program executed by the processor is pre-recorded in the memory of the microcomputer here, but may be provided by being recorded on a non-temporary recording medium such as a memory card or provided through an electric communication line such as the Internet. May be done.

  The signal output from each light receiving element 101 is input to the control unit 304 via the conversion circuit 102, the amplification circuit 103, the A / D converter 104, the pyroelectric buffer 301, and the pyroelectric filter unit 302. Specifically, the plurality of pyroelectric sensors 10 have light receiving elements 101 and output an output signal V corresponding to a change in the intensity of infrared light received from a corresponding detection area to a detection unit 310 described later (FIG. 1). Specifically, the first pyroelectric sensor 11 outputs an output signal V <b> 1 to the detection unit 310 in accordance with a change in the intensity of infrared light received from the first detection area 81. The four second pyroelectric sensors 12 (12a to 12d) respectively output the output signals V2 (V2a to V2d) corresponding to changes in the intensity of infrared light received from the second detection areas 82 (82a to 82d) to the detection unit 310. Output to

  The pyroelectric filter unit 302 extracts an AC component from the output of the pyroelectric sensor 10. The frequency band passed by the pyroelectric filter unit 302 is set to, for example, 0.3 Hz to 1 Hz. The outputs of the pyroelectric filters 302, that is, the output signals V1 and V2, are AC signals from which low-frequency components (including DC components) have been removed.

  Here, the frequency band (pass band) through which the pyroelectric filter unit 302 that receives the output from the first pyroelectric sensor 11 passes when performing stay detection and when entering detection may be different. . In other words, the pyroelectric filter unit 302 may switch the pass band between the case where stay detection is performed and the case where entry detection is performed. When the stay detection is performed, the passband of the pyroelectric filter unit 302 is set to, for example, 0.3 Hz to 1 Hz as described above for the output signal V1 output from the first pyroelectric sensor 11. On the other hand, when the entry detection is performed, the pass band of the pyroelectric filter unit 302 is set to a frequency band having a center frequency around 1 Hz, for example, for the output signal V1 output from the first pyroelectric sensor 11. In addition, as for the output signal V2 output from the second pyroelectric sensors 12a to 12d, the pass band of the pyroelectric filter unit 302 is a frequency band having a center frequency around 1 Hz, for example.

  The storage unit 303 has a device selected from a ROM (Read Only Memory), a RAM (Random Access Memory), an EEPROM (Electrically Erasable Programmable Read Only Memory), and the like.

  The storage unit 303 stores a threshold value used for detecting the person 91 for each pyroelectric sensor 10. Specifically, the storage unit 303 stores a first movement detection threshold (third threshold) and a stay detection threshold (first threshold) used for the detection of the person 91 by the first pyroelectric sensor 11. Further, the storage unit 303 stores, for each of the plurality of second pyroelectric sensors 12, a second movement detection threshold (second threshold) used for detecting the person 91. Further, the storage unit 303 stores a minimum value (minimum threshold) set as a stay detection threshold of the first pyroelectric sensor 11. In the present embodiment, the first movement detection threshold and the second movement detection threshold have the same value, but may have different values. In the present embodiment, the plurality of second movement detection threshold values corresponding to the plurality of second pyroelectric sensors 12 are the same value, but may be different values.

  Further, the storage unit 303 stores a threshold (control threshold) used for forcibly controlling the illumination control system 40 (here, controlling to turn off the light) in the first pyroelectric sensor 11. . In the present embodiment, the control threshold is a value smaller than the first movement detection threshold and larger than the stay detection threshold.

  Further, the storage unit 303 stores the first determination time length associated with the stay detection threshold value, the second determination time length associated with the control threshold value, and the first determination time length associated with the first movement detection threshold value. 3 The determination time length is stored. Here, the first determination time length is the shortest, and the third determination time length is the longest. For example, the first determination time length is 1 minute, the second determination time length is 10 minutes, and the third determination time length is 15 minutes. Note that these numerical values are merely examples, and are not intended to limit the numerical values.

  The control unit 304 includes a detection unit 310 and an instruction unit 311 as shown in FIG.

  The detection unit 310 detects the presence or absence of the person 91 in the first detection area 81 based on the output value of the output signal V of each pyroelectric sensor 10. In other words, the detection unit 310 determines that the state of the first detection area 81 is “presence state” in which the person 91 is present in the first detection area 81 and “absence state” in which the person 91 is not present in the first detection area 81. Is determined.

  The operation mode of the detection unit 310 (that is, the operation mode of human detection) includes an approach detection mode and a stay detection mode. The entry detection mode is an operation mode for detecting whether or not the person 91 has entered the first detection area 81. The stay detection mode is an operation mode for detecting whether or not the person 91 has left the first detection area 81, in other words, an operation mode for detecting the presence or absence of the person 91 in the first detection area 81. . That is, the detection unit 310 performs the entry detection in the entry detection mode, and performs the stay detection and the exit detection in the stay detection mode.

  The detecting unit 310 includes a determining unit 320 and a changing unit 321 as shown in FIG.

  In the approach detection mode, the determination unit 320 stores the first pyroelectric sensor 11 as a determination threshold used for determining whether the state of the first detection area 81 is the “existing state”. Is set for the first movement detection threshold value stored in.

  The determination unit 320 determines whether or not the output value of the output signal V1 of the first pyroelectric sensor 11 has exceeded the first movement detection threshold in the approach detection mode. When determining that the output value of the output signal V1 has exceeded the first movement detection threshold, the determination unit 320 determines that the person 91 has entered the first detection area 81, that is, determines that the person 91 is in the presence state. When the determination unit 320 determines that the output value of the output signal V1 is lower than the first movement detection threshold in the entry detection mode, the person 91 has not entered the first detection area 81, that is, in the absence state. It is determined that there is.

  The determination unit 320 changes the operation mode from the entry detection mode to the stay detection mode when it is determined that the vehicle is in the presence state in the entry detection mode. At this time, in the stay detection mode, the determination unit 320 stores the first pyroelectric sensor 11 as a determination threshold used for determining whether the state of the first detection area 81 is the “existing state”. The stay detection threshold stored in the unit 303 is set.

  When determining that the person 91 is present in the first detection area 81, the determination unit 320 determines that the person 91 is present in the second detection area 82 based on the output value of the output signal V2 of the second pyroelectric sensor 12. When it is determined, it is determined that the person 91 has left the first detection area 81. That is, the determination unit 320 determines whether or not the output value of the output signal V1 of the first pyroelectric sensor 11 exceeds the stay detection threshold in the stay detection mode. When the determination unit 320 determines that the output value of the output signal V1 of the first pyroelectric sensor 11 exceeds the stay detection threshold in the stay detection mode, the person 91 is staying in the first detection area 81. That is, it is determined that it is in the presence state.

  When determining that the output value of the output signal V1 of the first pyroelectric sensor 11 exceeds the stay detection threshold in the stay detection mode, the determination unit 320 starts measuring the exit determination time stored in the storage unit 303. I do. The determination unit 320 determines that the output value of at least one output signal V2 of the output signals V2a to V2d of the four second pyroelectric sensors 12a to 12d corresponds to the second movement during the period until the exit determination time elapses. It is determined whether or not the detection threshold has been exceeded. The determination unit 320 determines that the output value of at least one output signal V2 of the output signals V2a to V2d of the four second pyroelectric sensors 12a to 12d corresponds to the second movement during the period until the exit determination time elapses. When it is determined that the detection threshold value has been exceeded, it is determined that the person 91 has left the first detection area 81, that is, is in the absence state. When determining that the person 91 is absent in the first detection area 81, the determination unit 320 sets the first movement detection threshold for the first pyroelectric sensor 11 as the determination threshold. At this time, the determination unit 320 changes the operation mode from the stay detection mode to the approach detection mode. Here, the exit determination time is, for example, 10 seconds.

  More specifically, when the determination unit 320 determines that the output value of the output signal V1 of the first pyroelectric sensor 11 exceeds the stay detection threshold in the stay detection mode, the determination unit 320 starts measuring the exit determination time. The determination unit 320 determines that the output value of at least one of the output signals V2 among the output signals V2a to V2d exceeds the corresponding second movement detection threshold during a period from the start of the time measurement to the elapse of the exit determination time. In this case, the person 91 leaves the first detection area 81 and is absent, that is, determined to be absent. When determining that the person 91 is absent in the first detection area 81, the determination unit 320 sets the first movement detection threshold for the first pyroelectric sensor 11 as the determination threshold. At this time, the determination unit 320 changes the operation mode from the stay detection mode to the approach detection mode. Further, the determination unit 320 determines that the output value of at least one output signal V2 among the output signals V2a to V2d corresponds to the corresponding second movement detection threshold during a period from the start of the time measurement to the elapse of the exit determination time. Does not exceed, the person 91 stays without leaving the first detection area 81, that is, it is determined that the person 91 is present. At this time, the determination unit 320 resets the counting of the leaving determination time, and determines again whether the output value of the output signal V1 exceeds the stay detection threshold. When determining that the output value of the output signal V1 exceeds the stay detection threshold, the determination unit 320 starts measuring the exit determination time. The time of the exit determination time may be counted up from the value “0” to the time length of the exit determination time, or may be counted down from the time length of the exit determination time to the value “0”.

  In the stay detection mode, the determination unit 320 determines the absence of the person 91 in the first detection area 81 using the absence determination time stored in the storage unit 303 in addition to the above-described exit determination.

  The determination unit 320 determines whether or not the output value of the output signal V1 of the first pyroelectric sensor 11 is always lower than the stay detection threshold value until the absence determination time elapses. The determination unit 320 determines that the person 91 is absent in the first detection area 81, that is, is in the absent state, when the output value of the output signal V1 is always below the stay detection threshold during the absence determination time. When determining that the person 91 is absent in the first detection area 81, the determination unit 320 sets the first movement detection threshold for the first pyroelectric sensor 11 as the determination threshold. At this time, the determination unit 320 changes the operation mode from the stay detection mode to the approach detection mode. Here, the absence determination time is, for example, one minute.

  More specifically, when the output value of the output signal V1 of the first pyroelectric sensor 11 falls below the stay detection threshold in the stay detection mode, the determination unit 320 stores the first determination stored in the storage unit 303 as the absence determination time. Start timing the time up to the time length. If the output value of the output signal V1 of the first pyroelectric sensor 11 is always lower than the stay detection threshold during a period from the start of time measurement to the lapse of the absence determination time, It is determined that 91 is absent in the first detection area 81, that is, it is in the absent state. When the output value of the output signal V1 of the first pyroelectric sensor 11 exceeds the stay detection threshold during the period from the start of time measurement to the lapse of the absence determination time, the determination unit 320 It is determined that it exists in the first detection area 81, that is, the presence state. At this time, the determination unit 320 resets the time measurement. Thus, the stay detection mode is continued. The time of the absence determination time may be counted up from the value “0” to the first determination time length (time length of the absence determination time), or may be counted down from the first determination time length to the value “0”. Is also good.

  Further, in the stay detection mode, the determination unit 320 sets the output value of the output signal V1 of the first pyroelectric sensor 11 to the first pyroelectric sensor 11 during the second determination time length stored in the storage unit 303. It is determined whether the value is always below the control threshold. When the output value of the output signal V1 of the first pyroelectric sensor 11 is always lower than the control threshold during the period of the second determination time, the determination unit 320 determines that the person 91 is in the first detection area 81. It is determined that the user is absent, that is, an absent state. When determining that the person 91 is absent in the first detection area 81, the determination unit 320 sets the first movement detection threshold for the first pyroelectric sensor 11 as the determination threshold. At this time, the determination unit 320 changes the operation mode from the stay detection mode to the approach detection mode. Here, the second determination time length is, for example, 10 minutes.

  More specifically, in the stay detection mode, when the output value of the output signal V1 of the first pyroelectric sensor 11 falls below the control threshold value in the stay detection mode, the determination unit 320 Start timing of time. If the output value of the output signal V1 of the first pyroelectric sensor 11 is always lower than the control threshold during the period from the start of time measurement to the second determination time length, the determination unit 320 determines that the person 91 Is determined to be absent in the first detection area 81, that is, to be in the absent state. The determination unit 320 resets the time measurement when the output value of the output signal V1 of the first pyroelectric sensor 11 exceeds the control threshold during the period from the start of the time measurement to the second determination time length. . The time counting up to the second determination time length may be counted up from the value “0” to the second determination time length, or may be counted down from the second determination time length to the value “0”. The determination unit 320 compares the output value of the output signal V1 with the control threshold during the period up to the second determination time length, and thereby detects a motion larger than the motion of the person 91 detected using the stay detection threshold. Can be detected.

  The determination unit 320 sets the output value of the output signal V1 of the first pyroelectric sensor 11 to the first pyroelectric sensor 11 for the first pyroelectric sensor 11 during the third determination time length stored in the storage unit 303 in the stay detection mode. It is determined whether or not the value is always below the movement detection threshold. When the output value of the output signal V1 of the first pyroelectric sensor 11 is always lower than the first movement detection threshold during the third determination time period, the determination unit 320 determines that the person 91 is in the first detection area. At 81, it is determined that the user is absent, that is, the user is absent. When determining that the person 91 is absent in the first detection area 81, the determination unit 320 sets the first movement detection threshold for the first pyroelectric sensor 11 as the determination threshold. At this time, the determination unit 320 changes the operation mode from the stay detection mode to the approach detection mode. Here, the third determination time length is, for example, 15 minutes.

  More specifically, the determination unit 320 performs the third determination when the output value of the output signal V1 of the first pyroelectric sensor 11 falls below the first movement detection threshold in the first pyroelectric sensor 11 in the stay detection mode. Start timing the time up to the time length. If the output value of the output signal V1 of the first pyroelectric sensor 11 is always lower than the first threshold for detection of entry during the period from the start of time measurement to the third determination time length, It is determined that 91 is absent in the first detection area 81, that is, it is in the absent state. If the output value of the output signal V1 of the first pyroelectric sensor 11 exceeds the first movement detection threshold during the period from the start of time measurement to the third determination time length, the determination unit 320 measures time. Reset. Note that the time counting up to the third determination time length may be counted up from the value “0” to the third determination time length, or may be counted down from the third determination time length to the value “0”. The determination unit 320 compares the output value of the output signal V1 with the first movement detection threshold value during the period up to the third determination time length, so that the movement of the person 91 detected using the control threshold value can be compared. Large movement can be detected.

  In short, the determination unit 320 uses the output value of the output signal V1 of the first pyroelectric sensor 11, the stay detection threshold, the control threshold, and the first movement detection threshold for the first pyroelectric sensor 11, Human detection is performed with a plurality of (three in this embodiment) sensitivities.

  The determination unit 320 determines that the output value of the output signal V1 of the first pyroelectric sensor 11 exceeds any one of the threshold for stay detection, the threshold for control, and the threshold for first movement detection for the first pyroelectric sensor 11. Resets the measurement of the determination time length corresponding to the threshold value. At this time, the determination unit 320 also resets the determination time length corresponding to a threshold smaller than the threshold. For example, when the output value of the output signal V1 of the first pyroelectric sensor 11 exceeds the first approach detection threshold value within the period of the third determination time length, the determination unit 320 counts the time of the third determination time length. Reset. At this time, since the output value of the output signal V1 of the first pyroelectric sensor 11 exceeds both the stay detection threshold and the control threshold, the determination unit 320 determines that the stay detection threshold and the control threshold The timing of the corresponding first determination time length and second determination time length is also reset.

  The determination unit 320 determines any one of the first determination time length, the second determination time length, and the third determination time length corresponding to each of the stay detection threshold value, the control threshold value, and the first movement detection threshold value. After the elapse of the clocking time, the person 91 is determined to be absent in the first detection area 81, that is, to be in the absent state. In other words, the determination unit 320 determines whether the output value of the output signal V1 of the first pyroelectric sensor 11 is associated with one of the threshold for stay detection, the threshold for control, and the threshold for first movement detection. If the threshold is not exceeded within the length, the person 91 is determined to be absent in the first detection area 81.

  For example, when the output value of the output signal V1 of the first pyroelectric sensor 11 exceeds the stay detection threshold value within the period of the first determination time length (absence determination time), the determination unit 320 performs the first detection. It is determined that the user has not exited from the area 81, that is, it is in the presence state, and the stay detection mode is continued. At this time, the output signal V1 of the first pyroelectric sensor 11 may include noise due to the influence of the environment such as temperature, illuminance, and wind in the first detection area 81. Therefore, the determination unit 320 may have a possibility that the output value of the output signal V1 exceeds the stay detection threshold within the period of the first determination time period, even though the person 91 is absent in the first detection area 81. . That is, noise is included in the output signal V1 of the first pyroelectric sensor 11 due to the influence of the environment in the first detection area 81. Detection may be performed.

  By the way, the person 91 is detected using the stay detection threshold value within the period of the second determination time length (here, 10 minutes) and the period of the third determination time length (here, 15 minutes). There is a high possibility that the movement will be larger than the movement of 91. Therefore, in the present embodiment, in the stay detection mode, the determination unit 320 detects the stay of the person 91 in the first detection area 81 using the stay detection threshold, and within a predetermined time (the second determination time length). During the period, the period of the third determination time length), the stay of the person 91 in the first detection area 81 is detected using another threshold value (control threshold value, first movement detection threshold value). The determination unit 320 does not detect a motion larger than the motion of the person 91 detected using the stay detection threshold value within the period of the second determination time length or the period of the third determination time length. In the one detection area 81, it is determined that the state is absent.

  As a result, even when the stay of the person 91 is detected using the stay detection threshold, the determination unit 320 can perform the determination within the predetermined time (within the period of the second determination time or the period of the third determination time). The above erroneous detection can be eliminated by detecting the presence or absence of a larger movement in (in).

  In the approach detection mode, the changing unit 321 changes the stay detection threshold stored in the storage unit 303 for the first pyroelectric sensor 11 according to the output value of the output signal V1 of the first pyroelectric sensor 11.

  Specifically, in the approach detection mode, the changing unit 321 determines that the output value of the output signal V1 of the first pyroelectric sensor 11 exceeds the stay detection threshold and that the first pyroelectric sensor 11 It is determined whether it is below the threshold. When the change unit 321 determines that the output value of the output signal V1 of the first pyroelectric sensor 11 exceeds the stay detection threshold value and falls below the corresponding first movement detection threshold value, the storage unit 303 The stored stay detection threshold is changed. More specifically, the change unit 321 changes the stay detection threshold stored in the storage unit 303 to a value larger than the currently set value. Since the stay detection threshold is smaller than the first movement detection threshold, the stay detection threshold after the change is also smaller than the first movement detection threshold. More specifically, the changing unit 321 outputs the output of the first pyroelectric sensor 11 for a first time (for example, 5 seconds) after the output value of the output signal V1 of the first pyroelectric sensor 11 exceeds the stay detection threshold. The maximum output value is extracted from the output values of the signal V1. The change unit 321 changes the stay detection threshold stored in the storage unit 303 to a value larger than the extracted maximum value.

  The change unit 321 does not change the stay detection threshold when the output value of the output signal V1 of the first pyroelectric sensor 11 exceeds the determination threshold (first movement detection threshold) in the approach detection mode. More specifically, in the entry detection mode, the changing unit 321 determines that the output value of the output signal V1 of the first pyroelectric sensor 11 exceeds the threshold value for stay detection within the first time after the output value of the output signal V1 exceeds the threshold value for determination. If the threshold value exceeds one (1) movement detection threshold value, the stay detection threshold value is not changed.

  Furthermore, in the entry detection mode, the change unit 321 determines whether the output value of the output signal V1 from the first pyroelectric sensor 11 is always below the stay detection threshold for the second pyroelectric sensor for the second time. Determine whether or not. If the change unit 321 determines that the output value of the output signal V1 of the first pyroelectric sensor 11 is always lower than the stay detection threshold during the second time, the change unit 321 changes the stay detection threshold stored in the storage unit 303. change. More specifically, the change unit 321 changes the stay detection threshold value stored in the storage unit 303 to a value smaller than the currently set value. In the present embodiment, the changing unit 321 changes the value to a value smaller than the currently set value and larger than the maximum output value in the second time. Here, the second time is, for example, one minute.

  When the determination unit 320 determines that the person is in the presence state, that is, determines that the person 91 has entered the first detection area 81, the first pyroelectric sensor 11 determines the stay detection threshold stored in the storage unit 303 for the determination. Set to a threshold. At this time, the determination unit 320 changes the operation mode from the entry detection mode to the stay detection mode.

  In addition, the determination unit 320 determines that the state is absent in the first detection area 81, and changes the operation mode from the stay detection mode to the entry detection mode, and sets the first pyroelectric current for a predetermined third time. When the output value of the output signal V1 of the sensor 11 exceeds the first movement detection threshold, the operation mode is changed from the entry detection mode to the stay detection mode. At this time, the determination unit 320 sets the minimum threshold value in the first pyroelectric sensor 11 as the stay detection threshold value as the determination threshold value. Here, the third time is, for example, 10 seconds.

  The instruction unit 311 outputs a control signal indicating whether or not the lighting fixture 41 needs to be turned on to the control device 42 via the output unit 305, based on the detection result of the detection unit 310. Specifically, when the detection result of detection unit 310 is absent, instruction unit 311 outputs to control device 42 a control signal (light-off signal) indicating that lighting is unnecessary, that is, light-off. . When the detection result of the detection unit 310 is in the presence state, the instruction unit 311 outputs a control signal (lighting signal) indicating that lighting is necessary, that is, lighting, to the control device 42.

  The instruction unit 311 is configured to control the lighting apparatus 41 by transmitting a control signal. That is, the instruction unit 311 corresponds to the load control unit according to the present disclosure.

  The output unit 305 is a communication interface for communicating with the control device 42. The output unit 305 outputs the control signal output from the instruction unit 311 to the control device 42.

(3) Operation Next, the operation of the human detection system 1 according to the present embodiment, in particular, the entry detection and the exit detection will be described with reference to FIG. Here, it is assumed that the person 91 enters the first detection area 81 and exits from the first detection area 81 through the second detection area 82a.

  In FIG. 4, the change in the output value of the output signal V1 of the first pyroelectric sensor 11, the change in the output value of the output signal V2a of the second pyroelectric sensor 12 a, and the presence / absence of the determination unit 320 along the time axis. This represents a change in the determination result. In FIG. 4, the first movement detection threshold is represented by Th11, the stay detection threshold is represented by Th12, and the second movement detection threshold is represented by Th21.

  In the entry detection mode, the determination unit 320 determines whether or not the output signal V1 of the first pyroelectric sensor 11 has exceeded the first movement detection threshold Th11.

  At time t1, since the person 91 passes through the second detection area 82a to enter the first detection area 81, the output value of the output signal V2a of the second pyroelectric sensor 12a exceeds the second movement detection threshold Th21. At this time, since the person 91 has not reached the first detection area 81, the output value of the output signal V1 of the first pyroelectric sensor 11 is lower than the first movement detection threshold Th11. Therefore, at time t1, the determination unit 320 determines that the person 91 is absent in the first detection area 81, that is, the absent state.

  At time t2, since the person 91 passes through the second detection area 82a and enters the first detection area 81, the output value of the output signal V1 of the first pyroelectric sensor 11 exceeds the first movement detection threshold Th11. Therefore, the determination unit 320 determines that the person 91 has entered the first detection area 81, that is, the presence state. The human detection system 1 outputs a control signal (lighting signal) indicating lighting to the control device 42. Thereby, the lighting fixture 41 is turned on.

  Further, at time t2, the determination unit 320 changes the determination threshold of the first pyroelectric sensor 11 from the first movement detection threshold Th11 to the stay detection threshold Th12. Further, the detection unit 310 changes the operation mode from the entry detection mode to the stay detection mode.

  The determination unit 320 determines whether or not the output value of the output signal V1 of the first pyroelectric sensor 11 is lower than the stay detection threshold in the stay detection mode. When determining that the output value of the output signal V1 is lower than the stay detection threshold, the determination unit 320 starts measuring the absence determination time. The determination unit 320 determines whether or not the output value of the output signal V1 of the first pyroelectric sensor 11 is always lower than the stay detection threshold value until the absence determination time elapses.

  In FIG. 4, at time t4 from the time t3 when the output value of the output signal V1 of the first pyroelectric sensor 11 falls below the stay detection threshold Th12 set as the determination threshold, until the first determination time elapses. , The output value of the output signal V1 exceeds the stay detection threshold Th12. Therefore, the determination unit 320 determines that the vehicle is in the presence state, and continues the stay detection mode. In addition, the determination unit 320 resets the counting of the time of the first determination time length. At this time, the human detection system 1 outputs a control signal (lighting signal) indicating lighting to the control device 42.

  When the determination unit 320 determines that the output value of the output signal V1 exceeds the stay detection threshold in the stay detection mode, the determination unit 320 starts counting the exit determination time. The determination unit 320 determines that the output value of at least one of the output signals V2a to V2d of the four second pyroelectric sensors 12a to 12d corresponds to the second movement detection during the period until the exit determination time elapses. It is determined whether or not the threshold value Th21 has been exceeded.

  In FIG. 4, during the period from time t4 when the output value of the output signal V1 of the first pyroelectric sensor 11 exceeds the stay detection threshold Th12 to when the exit determination time elapses, all output values of the output signals V2a to V2d are It is always below the second movement detection threshold Th21. Therefore, the determination unit 320 determines that the person 91 has not left the first detection area 81, that is, is in the presence state. At this time, the human detection system 1 outputs a control signal (lighting signal) indicating lighting to the control device 42.

  In FIG. 4, at time t5, the output value of the output signal V1 of the first pyroelectric sensor 11 exceeds the stay detection threshold Th12 due to the motion of the person 91 trying to exit the first detection area 81. At time t6 during the period from the time t5 to the elapse of the exit determination time, the person 91 exits the first detection area 81 and passes through the second detection area 82a, so that the output signal V2a of the second pyroelectric sensor 12a is output. The value exceeds the second movement detection threshold Th21. Therefore, the determination unit 320 determines that the person 91 has left the first detection area 81, that is, is in the absent state. The human detection system 1 outputs a control signal (light-off signal) indicating light-off to the control device 42. Thereby, the lighting fixture 41 is turned off.

  Also, at time t6, the determination unit 320 changes the determination threshold of the first pyroelectric sensor 11 from the stay detection threshold Th12 to the first movement detection threshold Th11. Further, detecting section 310 changes the operation mode from the stay detection mode to the approach detection mode.

  If the output value of the output signal V1 of the first pyroelectric sensor 11 exceeds the first movement detection threshold value Th11 during the third time starting at time t6, the determination unit 320 detects that the operation mode has been entered. Change from mode to stay detection mode. At this time, the determination unit 320 sets the minimum threshold in the first pyroelectric sensor 11 as the stay detection threshold as the determination threshold. Thereby, even when the human detection system 1 mistakenly turns off the lighting fixture 41, if the person 91 is detected within the third time, the lighting can be turned on again.

  Next, a change in setting of the stay detection threshold Th12 of the first pyroelectric sensor 11 in the entry detection mode will be described with reference to FIG.

  FIG. 5 shows a change in the output value of the output signal V1 of the first pyroelectric sensor 11 along the time axis. Here, it is assumed that the value “a” is set as the first movement detection threshold Th11, and the value “b” is set as the initial value of the stay detection threshold Th12. Note that the value “b” is a value smaller than the value “a”.

  In the approach detection mode, the changing unit 321 determines whether or not the output value of the output signal V1 of the first pyroelectric sensor 11 exceeds the stay detection threshold Th12 and falls below the first movement detection threshold Th11.

  At time t11, the output value of the output signal V1 of the first pyroelectric sensor 11 exceeds the value “b” and falls below the value “a”. The change unit 321 stores the stay stored in the storage unit 303 in the value “c” that is larger than the maximum output value among the output values of the output signal V1 during the period from time t11 to time t12 as the first time (5 seconds). The detection threshold Th12 is changed (time t12). Accordingly, the value “b” as the stay detection threshold Th12 stored in the storage unit 303 is changed to the value “c”. Since the stay detection threshold Th12 is smaller than the first movement detection threshold Th11, the value “c” as the changed stay detection threshold Th12 is also changed to the value “c” as the first movement detection threshold Th11. It is a value smaller than a ″.

  At time t13, the output value of the output signal V1 of the first pyroelectric sensor 11 exceeds the value “c” and falls below the value “a”. The change unit 321 stores the stay stored in the storage unit 303 in the value “d” that is larger than the maximum output value among the output values of the output signal V1 during the period from the time t13 to the time t14 as the first time (5 seconds). The detection threshold Th12 is changed (time t14). As a result, the value “c” as the stay detection threshold Th12 stored in the storage unit 303 is changed to the value “d”. Since the stay detection threshold Th12 is smaller than the first movement detection threshold Th11, the value “d” as the changed stay detection threshold Th12 is also changed to the value “d” as the first movement detection threshold Th11. It is a value smaller than a ″.

  The change unit 321 determines whether the output value of the output signal V1 from the first pyroelectric sensor 11 is always lower than the stay detection threshold Th12 for the first pyroelectric sensor 11 during the second time in the entry detection mode. judge.

  In FIG. 5, the output value of the output signal V1 of the first pyroelectric sensor 11 always falls below the value “d” as the stay detection threshold Th12 in a period P1 (a period from time t14 to t15) representing the second time. I have. The change unit 321 sets the stay detection threshold Th12 stored in the storage unit 303 to a value smaller than the currently set value “d” and larger than the maximum output value of the output signal V1 in the second time. Is changed to the value “e”. Thus, the value “d” as the stay detection threshold Th12 stored in the storage unit 303 is changed to the value “e”.

  Next, in the entry detection mode, regarding the operation related to the change of the stay detection threshold Th12 when the output value of the output signal V1 of the first pyroelectric sensor 11 exceeds the value “b” and falls below the value “a”, This will be described with reference to FIG. Here, a case where the value “b” as the stay detection threshold Th12 is changed to the value “c” will be described.

  At time t11, the changing unit 321 detects that the output value of the output signal V1 of the first pyroelectric sensor 11 exceeds the value “b” and falls below the value “a”. The changing unit 321 acquires the maximum value “b1” of the output values of the output signal V1 of the first pyroelectric sensor 11 during the period P2 from the time t11 to the time t12 as the first time.

  At time t12, the changing unit 321 changes the value “b” as the stay detection threshold Th12 stored in the storage unit 303 to a value “c” larger than the acquired value “b1”.

(4) Advantages In the conventional human detection system that monitors only one detection area, when the output value of the output signal of the pyroelectric sensor is always below the threshold for a predetermined time, it is determined that the state is absent in the detection area. When the determination is made, there is a possibility that it takes a long time from when the person actually leaves the detection area to when the absence is determined.

  Therefore, in the human detection system 1 of the present embodiment, the first detection area 81 which is a control target area for controlling the lighting device 41 (load), the second detection area 82 including the periphery of the first detection area 81, Is monitoring. In the present embodiment, the first detection region 81 is surrounded by a region where the plurality of second detection regions 82 are combined. Therefore, in order for the person 91 to enter the first detection area 81, the person 91 passes through the second detection area 82. Further, when the person 91 leaves the first detection area 81, the person 91 enters the second detection area 82. In the stay detection mode, the human detection system 1 uses the output value of the output signal V2 of the second pyroelectric sensor 12 to determine whether or not the human 91 has left the first detection area 81. That is, the human detection system 1 according to the present embodiment detects the entry of the person 91 into the first detection area 81 and the exit of the person 91 from the first detection area 81, in other words, the first detection area 81 and the first detection area 81, which are different from each other. The movement of the person 91 between the second detection area 82 and the second detection area 82 can be detected. Therefore, in the human detection system 1 of the present embodiment, it is possible to reduce the time required to determine whether the person 91 has left the first detection area 81. Therefore, the time from when the person 91 leaves the first detection area 81 to when the lighting apparatus 41 is turned off can be shortened, and unnecessary power consumption can be suppressed.

  In the present embodiment, the first detection region 81 is surrounded by a region where the plurality of second detection regions 82 are combined. Therefore, the human detection system 1 can detect the exit of the person 91 from the first detection area 81 regardless of the direction in which the person 91 exits in the first detection area 81.

(5) Modifications Modifications will be listed below. The modifications described below can be applied in appropriate combinations with the above embodiments.

(5-1) Modification 1
In the above embodiment, the determination unit 320 determines whether or not the person 91 has entered the first detection area 81 based on the output value of the output signal V1 of the first pyroelectric sensor 11. It is not limited to. The determination unit 320 determines whether the person 91 has entered the first detection area 81 based on the output value of the output signal V1 of the first pyroelectric sensor 11 and the output value of the output signal V2 of the second pyroelectric sensor 12. It may be determined whether or not.

  In this case, the determination unit 320 determines whether or not the person 91 has entered the first detection area 81 based on the output value of the output signal V <b> 2 of the second pyroelectric sensor 12. It is determined whether or not the person 91 exists. The determination unit 320 determines the second value based on the output value of the output signal V1 of the first pyroelectric sensor 11 during a period from when it is determined that the person 91 is present in the second detection area 82 to when the entry determination time has elapsed. It is determined whether the person 91 has entered the 1 detection area 81.

  More specifically, in the approach detection mode, the determination unit 320 determines that the output value of at least one of the output signals V2a to V2s of the four second pyroelectric sensors 12a to 12d sets the second movement detection threshold value. It is determined whether or not it has exceeded. When the determination unit 320 determines that the output value of at least one of the output signals V2a to V2d of the four second pyroelectric sensors 12a to 12d has exceeded the second movement detection threshold, the determination unit 320 stores the output value in the storage unit 303. Start measuring the approach judgment time. The determination unit 320 determines whether or not the output value of the output signal V1 of the first pyroelectric sensor 11 has exceeded the first movement detection threshold value until the entry determination time has elapsed. When the output value of the output signal V1 exceeds the first movement detection threshold during a period until the entry determination time elapses, the determination unit 320 determines that the person 91 has entered the first detection area 81, that is, in the presence state. It is determined that there is. If the output value of the output signal V1 does not exceed the first movement detection threshold value until the entry determination time elapses, the determination unit 320 determines that the person 91 has not entered the first detection area 81, that is, is absent. It is determined that it is in the state. Here, the entry determination time is, for example, 10 seconds.

  In the example of FIG. 4, at time t1, the person 91 passes through the second detection area 82a to enter the first detection area 81, so that the output value of the output signal V2a of the second pyroelectric sensor 12a changes to the second movement detection. Exceeds the threshold value for use Th21. When the output value of the output signal V2a of the second pyroelectric sensor 12a exceeds the second movement detection threshold Th21, the determination unit 320 starts measuring the entry determination time. At time t2 from the time t1 to the elapse of the entry determination time, the person 91 enters the first detection area 81, so that the output value of the output signal V1 of the first pyroelectric sensor 11 becomes the first movement detection threshold Th11. Exceed. Therefore, the determination unit 320 determines that the person 91 has entered the first detection area 81, that is, the presence state. The human detection system 1 outputs a control signal (lighting signal) indicating lighting to the control device 42. Thereby, the lighting fixture 41 is turned on.

  As described above, in this modification, the person 91 is placed in the first detection area 81 based on the output value of the output signal V1 of the first pyroelectric sensor 11 and the output value of the output signal V2 of the second pyroelectric sensor 12. It is determined whether or not has entered. Therefore, the accuracy of determining whether the person 91 has entered the first detection area 81 can be increased.

(5-2) Modification 2
In the above embodiment, the determination unit 320 determines that the person 91 stays in the first detection area 81 when the output value of the output signal V1 of the first pyroelectric sensor 11 exceeds the stay detection threshold in the stay detection mode. Although it has been determined, the present invention is not limited to this configuration.

  Here, it is assumed that the first detection area 81 and the second detection area 82 do not overlap. In the stay detection mode, the determination unit 320 moves the person to the first detection area 81 based on the output value of the output signal V1 of the first pyroelectric sensor 11 and the output value of the output signal V2 of the second pyroelectric sensor 12. 91 may determine whether to stay.

  In this case, in the stay detection mode, the determination unit 320 determines that the output value of the output signal V1 of the first pyroelectric sensor 11 exceeds the stay detection threshold and that all of the output signals V2 of the plurality of second pyroelectric sensors 12 When the output value is lower than the second movement detection threshold, it is determined that the person 91 stays in the first detection area 81.

  Thereby, the accuracy of determining whether or not the person 91 stays (exists) in the first detection area 81 can be increased.

(5-3) Modification 3
In the above embodiment, the determination unit 320 determines whether or not the output value of the output signal V1 of the first pyroelectric sensor 11 has exceeded the stay detection threshold in the stay detection mode. Then, the determination unit 320 determines that the output values of the four second pyroelectric sensors 12a to 12d are within a period from when the output value of the output signal V1 exceeds the stay detection threshold to when the exit determination time elapses. It is determined whether or not the output value of at least one output signal V2 among V2a to V2d has exceeded a corresponding second movement detection threshold. The determination unit 320 determines that the person 91 has left the first detection area 81 when the output value of any of the output signals V2 exceeds the second movement detection threshold value during a period until the exit determination time elapses. Although it is determined, the present invention is not limited to this.

  If the output value of the output signal V1 is lower than the stay detection threshold after the output value of any of the output signals V2 exceeds the second movement detection threshold, the determination unit 320 It may be determined that the person 91 has left.

  In this case, the determination unit 320 determines whether or not the output value of the output signal V1 of the first pyroelectric sensor 11 has exceeded the stay detection threshold in the stay detection mode. Then, the determination unit 320 determines that the output value of the output signal V1 has exceeded the threshold value for stay detection and that the four second pyroelectric sensors 12a to 12d It is determined whether or not the output value of at least one of the output signals V2a to V2d has exceeded a corresponding second movement detection threshold. If the output value of any of the output signals V2 exceeds the second movement detection threshold during a period until the first exit determination time elapses, the determination unit 320 starts measuring the second exit determination time. The determination unit 320 determines whether or not the output value of the output signal V1 of the first pyroelectric sensor 11 is always below the stay detection threshold value until the second exit determination time elapses. The determination unit 320 determines that the output value of the output signal V1 always sets the stay detection threshold during a period from when the output value of any of the output signals V2 exceeds the second movement detection threshold to when the second exit determination time elapses. If it is below, it is determined that the person 91 has left the first detection area 81. In addition, the determination unit 320 sets the output value of the output signal V1 to the stay detection threshold during a period from when the output value of any of the output signals V2 exceeds the second movement detection threshold to when the second exit determination time elapses. Is exceeded, it is determined that the person 91 is staying in the first detection area 81, that is, in the presence state. Here, the second exit determination time is, for example, 15 seconds.

  In the present modification, when the person 91 is staying in the first detection area 81, the possibility of erroneous determination that the person 91 has left the first detection area 81 can be reduced.

(5-4) Modification 4
In the above embodiment, as shown in FIG. 3, the first detection region 81 is surrounded by a region where the four second detection regions 82 a to 82 d are combined, but is not limited thereto.

  An area in which the plurality of second detection areas 82 are combined may include a part around the first detection area 81. That is, there may be an area around the first detection area 81 where the second detection area 82 does not exist. For example, when there is the first detection area 81 at the end of a corridor or the like and the approach direction to the first detection area 81 is restricted, it is possible to enter the first detection area 81 around the first detection area 81. What is necessary is that the second detection region 82 be included in the region where the detection is possible. In other words, the area around the first detection area 81 that cannot enter the first detection area 81 due to a wall or the like may not include the second detection area 82.

  Further, in the example of FIG. 3, each of the second detection areas 82 includes an overlap area 820 overlapping with a part of the other second detection areas 82, but the overlap area 820 overlaps with the second detection area 82. 820 may not be included. For example, the plurality of second detection areas 82 may be adjacent to each other, or a gap may be provided between the plurality of second detection areas 82.

  In the example of FIG. 3, each second detection area 82 is adjacent to the first detection area 81 and does not overlap with the first detection area 81, but may overlap with the first detection area 81. Alternatively, there may be a gap between the first detection area 81 and the first detection area 81.

  Further, the outer shapes of the first detection region 81 and the second detection region 82 shown in FIG. 3 are merely examples, and are not limited thereto. For example, the outer shape of the first detection area 81 is not limited to a circle, and may be, for example, a square. The outer shape of the second detection area 82 may be, for example, a quadrangle. Further, the outer shapes of the plurality of second detection areas 82 may be different shapes and sizes from each other.

  The number of the second detection areas 82 is not limited to four, but may be one, two, three, or five or more. That is, the number of the second pyroelectric sensors 12 is not limited to four, but may be one, two, three, or five or more.

(5-5) Modification 5
In the above embodiment, the load controlled according to the detection result of the presence or absence of a person in the first detection area 81 is the lighting fixture 41. However, the controlled load may be an air conditioner.

  In this case, the human detection system 1 controls the air conditioner so that the air conditioner is turned on when an “existing state” is detected, and the air conditioner is turned off when an “absent state” is detected. Control the equipment.

(5-6) Modification 6
In the above embodiment, the human detection system 1 is configured to include the plurality of pyroelectric sensors 10, but is not limited to this configuration. The human detection system 1 may have a configuration that does not include the plurality of pyroelectric sensors 10, that is, a configuration that includes only the detection device 30.

(5-7) Modification 7
In the above embodiment, the human detection system 1 is configured to include the pyroelectric sensor 10 as a sensor used for detecting a human. However, the configuration is not limited to this. The human detection system 1 may include a thermal image sensor as a sensor used for detecting a human.

  In addition, in the stay mode, when performing human detection with three sensitivities as a plurality of sensitivities, the determination unit 320 uses an approach detection threshold, a control threshold, and a stay detection threshold. However, it is not limited to this configuration. When performing human detection with three sensitivities in the stay mode, the determination unit 320 determines one or two of an approach detection threshold, a control threshold, and a stay detection threshold, an approach detection threshold, and a control threshold. Alternatively, two or one threshold value different from the stay detection threshold value may be used. Alternatively, when performing human detection with three sensitivities in the stay mode, the determination unit 320 may use three thresholds different from the approach detection threshold, the control threshold, and the stay detection threshold.

  Further, in the case of performing the human detection with two sensitivities as the plurality of sensitivities in the stay mode, the determination unit 320 may use two thresholds among the approach detection threshold, the control threshold, and the stay detection threshold. Good. Alternatively, when performing human detection with two sensitivities in the stay mode, the determination unit 320 determines one of the threshold for entry detection, the threshold for control, and the threshold for stay detection, and the threshold for entry detection, One threshold different from the threshold for use and the threshold for stay detection may be used. Alternatively, when performing human detection with two sensitivities in the stay mode, the determination unit 320 may use two thresholds that are different from the approach detection threshold, the control threshold, and the stay detection threshold.

  In addition, when the determination unit 320 performs the human detection with four or more sensitivities as the plurality of sensitivities, the four or more thresholds used for the stay detection include an approach detection threshold, a control threshold, and a stay detection threshold. At least one threshold may be included. Alternatively, the four or more thresholds used for stay detection may be different from the approach detection threshold, the control threshold, and the stay detection threshold.

  Further, in the above embodiment, the changing unit 321 is configured to change the stay detection threshold based on the signal of the pyroelectric sensor 10 in the approach detection mode, but is not limited to this configuration. The change unit 321 may correct the output value of the pyroelectric sensor 10 in the stay detection mode, with the stay detection threshold being a fixed value.

(Other modifications)
The above embodiments are merely one of various embodiments of the present disclosure. The above embodiment can be variously modified according to the design and the like as long as the object of the present disclosure can be achieved. Further, the same function as the determination unit 320 in the human detection system 1 may be embodied by a human detection method, a computer program, a recording medium on which the program is recorded, or the like. The human detection method of the human detection system according to one aspect includes a determination step. In the determination step, the first sensor (first pyroelectric sensor 11) used for detecting the human body (human 91) in the first detection area 81 and the second sensor including at least a part of the area around the first detection area 81. In the detection area 82, a signal from a second sensor (second pyroelectric sensor 12) used for detecting a human body (human 91) is received. In the determination step, the presence of a human body (human 91) in the first detection area 81 is determined using at least the output value of the first sensor (first pyroelectric sensor 11). In the determination step, the exit of the human body (human 91) from the first detection area 81 is determined using at least the output value of the second sensor (second pyroelectric sensor 12).

  The program according to one embodiment is a program for causing a computer system to function as the above-described human detection system 1.

  The human detection system 1 according to the present disclosure includes a computer system. The computer system mainly has a processor and a memory as hardware. The function as the human detection system 1 in the present disclosure is realized by the processor executing the program recorded in the memory of the computer system. The program may be pre-recorded in the memory of the computer system, may be provided through an electric communication line, or may be recorded in a non-transitory recording medium such as a memory card, an optical disk, or a hard disk drive readable by the computer system. May be provided. A processor of a computer system is composed of one or more electronic circuits including a semiconductor integrated circuit (IC) or a large-scale integrated circuit (LSI). An integrated circuit such as an IC or an LSI referred to here differs depending on the degree of integration, and includes an integrated circuit called a system LSI, a VLSI (Very Large Scale Integration), or a ULSI (Ultra Large Scale Integration). Furthermore, an FPGA (Field-Programmable Gate Array), which is programmed after the manufacture of the LSI, or a logic device capable of reconfiguring the connection relation inside the LSI or reconfiguring the circuit section inside the LSI, is also adopted as a processor. Can be. The plurality of electronic circuits may be integrated on one chip, or may be provided separately on a plurality of chips. The plurality of chips may be integrated in one device, or may be provided separately in a plurality of devices. The computer system includes a microcontroller having one or more processors and one or more memories. Therefore, the microcontroller is also composed of one or more electronic circuits including a semiconductor integrated circuit or a large-scale integrated circuit.

  It is not an essential configuration of the human detection system 1 that the plurality of functions in the human detection system 1 are integrated in one housing, and the components of the human detection system 1 are distributed to the plurality of housings. May be provided. Furthermore, at least some functions of the human detection system 1, for example, some functions of the detection device 30 may be realized by a cloud (cloud computing) or the like.

  For example, the human detection system 1 may include a human detection device 500 and a server 501, as shown in FIG. In this case, the human detection device 500 and the server 501 are communicably connected via a network 502 such as the Internet. The human detection device 500 includes a plurality of pyroelectric sensors 10 as in the above embodiment. The human detection device 500 further includes an acquisition unit that acquires information corresponding to the output signals V of the plurality of pyroelectric sensors 10. The server 501 has the same function as the control unit 304 of the above embodiment.

  When detecting the presence state, the server 501 transmits control information (lighting information) indicating lighting to the human detection device 500 via the network 502. When the server 501 detects the absence state based on the human detection result, the server 501 transmits control information (light-off information) indicating light-off to the human detection device 500 via the network 502.

  When the lighting information is received from the server 501 as control information, the human detection device 500 outputs a lighting signal to the control device 42 as a control signal. When the light detection information is received from the server 501 as control information, the human detection device 500 outputs a light-off signal to the control device 42 as a control signal.

  In the stay detection mode, the server 501 determines that the person 91 has left the first detection area 81 based on the output value of the output signal V2 of the second pyroelectric sensor 12 received from the human detection device 500. .

  As described above, the human detection device 500 can control turning on and off of the lighting fixture 41 by cooperating with the server 501. Further, the server 501 can detect the exit of the person 91 from the first detection area 81 by cooperating with the person detection device 500. The human detection system 1 illustrated in FIG. 7 is effective, for example, when providing a service for controlling lighting equipment in a facility using information in the facility (information from the pyroelectric sensor 10).

(Summary)
The human detection system (1) according to the first aspect includes a determination unit (320). The determination unit (320) is configured to detect a first sensor (first pyroelectric sensor 11) used for detecting a human body (human 91) in the first detection area (81) and a human body in the second detection area (82). A signal from a second sensor (second pyroelectric sensor 12) to be used is received. The second detection area (82) includes at least a part of the area around the first detection area (81). The determination unit (320) determines the presence of a human body in the first detection area (81) using at least an output value of the first sensor. The determining unit (320) determines at least the exit of the human body from the first detection area (81) using the output value of the second sensor.

  According to this aspect, the first detection area (81) and the second detection area (82) including the periphery of the first detection area (81) are monitored. Therefore, in order for the human body to enter the first detection area (81), the human body passes through the second detection area (82). Also, when the human body leaves the first detection area (81), it enters the second detection area (82). The human detection system (1) determines the presence of a human body in the first detection area (81) using at least the output value of the first sensor, and uses the output value of at least the second sensor to determine the first detection area ( 81) is determined to leave the human body. Therefore, it is possible to detect the entry of the human body into the first detection area (81) and the exit of the human body from the first detection area (81), in other words, to detect the movement of the human body between two different detection areas. it can.

  In the human detection system (1) according to the second aspect, in the first aspect, the determination unit (320) performs the first detection using at least an output value of the first sensor and a first threshold (threshold for stay detection). The stay of the human body in the area (81) is determined. The determination unit (320) uses at least the output value of the second sensor and a second threshold value (second movement detection threshold value) larger than the first threshold value to determine whether the human body has exited from the first detection area (81). judge.

  According to this aspect, the leaving of the human body from the first detection area (81) is determined by using the second threshold value larger than the first threshold value used for determining the stay of the human body in the first detection area (81). In the case where the human body is staying in the first detection area (81), the possibility of erroneous determination that the human body has left the first detection area (81) can be reduced.

  In the human detection system (1) according to the third aspect, in the second aspect, when the output value of the first sensor exceeds the first threshold value, the determination unit (320) includes a human body in the first detection area (81). Is determined to exist.

  According to this aspect, it is possible to determine whether a human body exists in the first detection area (81) by comparing the output value of the first sensor with the first threshold value.

  In the human detection system (1) according to the fourth aspect, in the second aspect, the second detection area (82) does not overlap with the first detection area (81). The determination unit (320) determines that a human body exists in the first detection area (81) when the output value of the first sensor exceeds the first threshold value and the output value of the second sensor is lower than the second threshold value. I do.

  According to this aspect, the accuracy of determining whether or not a human body exists in the first detection area (81) can be increased.

  The human detection system (1) according to the fifth aspect is the system according to any of the second to fourth aspects, further including a change unit (321). The change unit (321) changes the first threshold value according to the output value of the first sensor when the determination unit (320) detects the entry of a human body into the first detection area (81).

  According to this aspect, when the approach detection is being performed, the first threshold value used for the stay detection is changed according to the output value of the first sensor, so that the accuracy of the stay detection can be increased. Thereby, the human detection system (1) can reduce the possibility that an erroneous detection occurs in the stay detection.

  The signal from the sensor contains noise depending on the environment of the first detection area (81). At this time, the output value of the first sensor containing noise may exceed the stay detection threshold. Therefore, when the stay detection is performed using the fixed stay detection threshold, even if the human body does not exist in the first detection area (81), it is erroneously detected that the human body exists in the first detection area (81). there's a possibility that. Therefore, when the approach detection is performed on the first detection area (81), the erroneous detection may occur by changing the stay detection threshold according to the output value of the output signal of the first sensor. Can be reduced.

  In the human detection system (1) according to the sixth aspect, in the fifth aspect, when the determination unit (320) performs the entry detection, the changing unit (321) outputs the first sensor with a first threshold value. Exceeds the third threshold value (first movement detection threshold value) greater than the first threshold value, the first sensor value during the first time after the output value of the first sensor exceeds the first threshold value A value larger than the maximum output value among the output values is set as the first threshold value. The change unit (321) decreases the first threshold when the output value of the first sensor is lower than the first threshold during the second time when the determination unit (320) is performing the entry detection. .

  According to this aspect, the stay detection threshold can be appropriately set according to the output value of the first sensor.

  In the human detection system (1) according to the seventh aspect, in the sixth aspect, the determination unit (320) includes a plurality of sensitivities using a plurality of threshold values including a first threshold value and a third threshold value. In step 81), the human body is detected. Different determination time lengths are associated with a plurality of threshold values. The determination unit (320) is configured to determine whether the first sensor has detected the entry of the human body into the first detection area (81) until a determination time corresponding to one of the plurality of thresholds elapses. If the output value does not exceed one threshold value, it is determined that the human body is absent in the first detection area (81).

  According to this aspect, by performing human detection with a plurality of sensitivities, it is possible to increase the detection accuracy of the presence of a human body in the first detection area (81).

  In the human detection system (1) according to the eighth aspect, in any one of the first to seventh aspects, the determination unit (320) includes a human body in the first detection area (81) based on an output value of the first sensor. It is further determined whether or not has entered.

  According to this aspect, it is possible to detect the entry of the human body into the first detection area (81).

  In the human detection system (1) according to the ninth aspect, in the eighth aspect, the determination unit (320) outputs the output of the second sensor when detecting the entry of the human body into the first detection area (81). The first detection area (81) based on the output value of the first sensor during a period from when it is determined that the human body is present in the second detection area (82) based on the value to when the entry determination time elapses. It is determined whether the human body has entered or not.

  According to this aspect, it is determined whether or not a human body has entered the first detection area (81) using the output value of the first sensor and the output value of the second sensor. ) Can be detected more accurately.

  In the human detection system (1) according to the tenth aspect, in any one of the first to ninth aspects, when the determination unit (320) determines that a human body exists in the first detection area (81), When it is determined that a human body exists in the second detection area (82) based on the output value of the second sensor, it is determined that the human body has exited from the first detection area (81).

  According to this aspect, it is possible to reduce the possibility of erroneous determination that the human body has left the first detection area (81) even though the human body does not exist in the first detection area (81).

  In the human detection system (1) according to the eleventh aspect, in the tenth aspect, the determining unit (320) determines that a human body is present in the first detection area (81) based on an output value of the first sensor. If it is determined that a human body exists in the second detection area (82) based on the output value of the second sensor during the period until the exit determination time elapses, it is determined that the human body has exited from the first detection area (81). judge.

  According to this aspect, it is determined whether or not the human body has exited from the first detection area (81) using the output value of the first sensor and the output value of the second sensor. ) Can be detected more accurately.

  In the human detection system (1) according to the twelfth aspect, in any one of the first to eleventh aspects, there are a plurality of second sensors. The first detection region (81) is surrounded by a region where the plurality of second detection regions (82) of the plurality of second sensors are combined.

  According to this aspect, it is possible to detect the withdrawal of the human body from the first detection area (81) regardless of the direction in which the human body withdraws from the first detection area (81).

  In the human detection system (1) according to the thirteenth aspect, in any one of the first to twelfth aspects, a load control unit is further provided. The load control unit controls the load according to the determination result of the determination unit (320).

  According to this aspect, it is possible to control the load according to the result of the human detection.

  In the human detection system (1) according to the fourteenth aspect, in the thirteenth aspect, the load is a lighting fixture (41). The load control unit (instruction unit 311) controls the lighting equipment (41) so that the lighting equipment (41) is turned on when detecting the presence of a human body in the first detection area (81). The load control unit controls the lighting device (41) such that the lighting device (41) is turned off when the absence of a human body in the first detection area (81) is detected.

  According to this aspect, it is possible to control turning on and off of the lighting equipment (41) according to the result of the human detection.

  In the human detection system (1) according to a fifteenth aspect, in any one of the first to fourteenth aspects, a first pyroelectric sensor (11) and a second pyroelectric sensor (12) are further provided. The first pyroelectric sensor (11) detects a change in infrared rays in the first detection area (81) as a first sensor. The second pyroelectric sensor (12) detects a change in infrared rays in the second detection area (82) as a second sensor.

  According to this aspect, in the human detection using the first pyroelectric sensor (11) and the second pyroelectric sensor (12), the withdrawal of the human body from the first detection area (81) can be detected.

  A program according to a sixteenth aspect functions as the determination unit (320) in the human detection system (1) according to any one of the first to fifteenth aspects.

  According to this aspect, the detection of the entry of the human body into the first detection area (81) and the exit of the human body from the first detection area (81), in other words, the movement of the human body between two different detection areas. Can be detected.

1 person detection system 11 first pyroelectric sensor (first sensor)
12 (12a to 12d) Second pyroelectric sensor (second sensor)
311 indicating unit (load control unit)
320 determination unit 321 change unit 41 lighting fixture 81 first detection area 82 (82a to 82d) second detection area 91 person (human body)

Claims (16)

A first sensor used for detection of a human body in a first detection area, and a determination unit that receives a signal from a second sensor used for detection of the human body in a second detection area,
The second detection region includes at least a part of a region around the first detection region,
The determination unit includes:
Using at least the output value of the first sensor, determine the presence of the human body in the first detection area,
Using at least the output value of the second sensor, determine the exit of the human body from the first detection area,
Human detection system. The determination unit includes:
Using at least an output value of the first sensor and a first threshold value, the stay of the human body in the first detection area is determined,
Using at least an output value of the second sensor and a second threshold value larger than the first threshold value, it is determined whether the human body has exited from the first detection area.
The human detection system according to claim 1. When the output value of the first sensor exceeds the first threshold, the determination unit determines that the human body is present in the first detection area.
The human detection system according to claim 2. The second detection area does not overlap with the first detection area,
When the output value of the first sensor exceeds the first threshold value and the output value of the second sensor is lower than the second threshold value, the determination unit determines that the human body exists in the first detection area. judge,
The human detection system according to claim 2. A change unit that changes the first threshold value according to an output value of the first sensor when the determination unit is performing detection of entry of the human body into the first detection region,
The human detection system according to claim 2. The change unit, when the determination unit is performing the approach detection,
When the output value of the first sensor exceeds the first threshold value and falls below a third threshold value larger than the first threshold value, the first sensor output value exceeds the first threshold value and the first A value larger than a maximum output value among output values of the first sensor during time is set as the first threshold value,
If the output value of the first sensor is lower than the first threshold during the second time, the first threshold is reduced,
The human detection system according to claim 5. The determination unit performs the detection of the human body in the first detection region with a plurality of sensitivities using a plurality of thresholds including the first threshold and the third threshold,
Different determination time lengths are associated with the plurality of thresholds,
The determination unit outputs the output of the first sensor during a period from when the human body enters the first detection area is detected to when a determination time corresponding to one of the plurality of thresholds elapses. If the value does not exceed the one threshold, it is determined that the human body is absent in the first detection area.
The human detection system according to claim 6. The determination unit is further configured to determine whether the human body has entered the first detection area based on an output value of the first sensor.
The human detection system according to claim 1. The determination unit is configured to determine that the human body is present in the second detection area based on an output value of the second sensor when performing detection of the approach of the human body to the first detection area. Determining whether the human body has entered the first detection area based on an output value of the first sensor during a period until the entry determination time elapses;
The human detection system according to claim 8. The determination unit, when determining that the human body is present in the first detection area, determining that the human body is present in the second detection area based on an output value of the second sensor, Determining that the human body has exited the detection area,
The human detection system according to claim 1. The determination unit is configured to determine whether the human body is present in the first detection area based on the output value of the first sensor and to determine whether the human body is present in the first detection area until the exit determination time elapses. When it is determined that the human body is present in the second detection area, it is determined that the human body has exited from the first detection area.
The human detection system according to claim 10. A plurality of the second sensors;
The first detection area is surrounded by an area where the plurality of second detection areas in the plurality of second sensors are combined.
The human detection system according to claim 1. A load control unit that controls a load according to the determination result of the determination unit, further includes:
The human detection system according to claim 1. The load is a lighting fixture;
The load control unit controls the lighting fixture so that the lighting fixture is turned on when detecting the presence of the human body in the first detection area, and detects the absence of the human body in the first detection area. Controlling the lighting fixture so that the lighting fixture is turned off,
The human detection system according to claim 13. A first pyroelectric sensor that detects a change in infrared light in the first detection area as the first sensor;
A second pyroelectric sensor that detects a change in infrared light in the second detection area, as the second sensor.
The human detection system according to claim 1.   A program for causing a computer to function as the determination unit in the human detection system according to claim 1.

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