TWI720608B - Human detection system and computer program product - Google Patents

Abstract

The present invention provides a human detection system and program capable of detecting the movement of the human body between two detection areas. The human detection system (1) includes a determination unit (320). The determination unit (320) receives from the first pyroelectric sensor (11) for detecting the human body in the first detection area, and the second pyroelectric sensor (12) for detecting the human body in the second detection area )signal of. The second detection area includes at least a part of the area around the first detection area. The judging unit (320) uses at least the output value of the first pyroelectric sensor (11) to judge the presence of the human body in the first detection area. The determination unit (320) uses at least the output value of the second pyroelectric sensor (12) to determine the exit of the human body from the first detection area.

Description

Human detection system and computer program products

The present invention generally relates to a person detection system and program, and more specifically, relates to a person detection system and program that detects the presence or absence of a person.

In the past, there has been known a system for detecting whether a human body is present in a predetermined area (for example, refer to Document 1 "Japanese Patent Publication No. 2017-150909").

The infrared detection system described in Document 1 has two light receiving units, a multiplication unit, an integration unit, and a determination unit. Each light receiving unit outputs an output signal corresponding to the change in the received light intensity of infrared rays from the detection space. The multiplication unit multiplies the output signal output from each light receiving unit. The integration unit performs integration processing on the multiplication result of the multiplication unit. The determination unit compares the integration result of the integration unit with the first determination threshold, and when the integration result is equal to or greater than the first determination threshold, determines that a person exists (stays) in the detection space.

In the previous infrared detection system (human detection system), only one detection area was monitored, and the output signal was multiplied and integrated. When the operation result did not reach the threshold for more than a predetermined time, it was judged to be in There is no human body in the detection area. That is, in the previous human detection system, the exit movement of the human body from the detection area cannot be detected.

In view of the above-mentioned reasons, the purpose of the present invention is to provide a method capable of detecting two A human detection system and program that detects the movement of the human body between areas.

The person detection system of one aspect of the present invention includes a judging unit. The determination unit receives signals from a first sensor for detecting the human body in the first detection area and a second sensor for detecting the human body in the second detection area. The second detection area includes at least a part of the surrounding area of the first detection area. The determination unit uses at least the output value of the first sensor to determine the presence of the human body in the first detection area. The determination unit uses at least the output value of the second sensor to determine the withdrawal of the human body from the first detection area.

The program of one aspect of the present invention enables a computer to function as the determination unit in the human detection system.

1: People detection system

10: Pyroelectric sensor

11: The first focal electric sensor (the first sensor)

12(12a~12d): The second focal electric sensor (the second sensor)

15: Optical system

30: Detection device

40: lighting control system

41: lighting fixtures

42: control device

81: The first detection area

82 (82a~82d): the second detection area

91: Human (human body)

101: Light-receiving element

102: Conversion circuit

103: Amplifying circuit

104: A/D converter

301: Buffer for Pyroelectricity

302: Filter section for pyroelectric power

303: Memory Department

304: Control Department

305: output section

310: Detection Department

311: Indication section (load control section)

320: Judgment Department

321: Change Department

500: Human detection device

501: Server

502: Network

820: overlapping area

Fig. 1 is a block diagram showing the structure of a person detection system according to an embodiment of the present invention.

Figure 2 is a diagram showing an example of use of the same person detection system.

Figure 3 is a schematic diagram of the first detection area and four second detection areas in the same person detection system.

Fig. 4 is a diagram for explaining the determination of the presence or absence of a person in the first detection area in the same person detection system.

Fig. 5 is a diagram for explaining how the threshold value for stay detection is changed in the same person detection system.

Fig. 6 is a diagram for explaining the case where the threshold value for stay detection is changed to a larger value in the same person detection system.

Fig. 7 is a diagram showing the configuration of a person detection system according to a modification of one embodiment of the present invention.

The embodiments and modified examples described below are only examples of the present invention, and the present invention is not limited to the embodiments and modified examples. Even if it is other than the content described in the embodiment and the modified example, as long as it is within the scope of the technical idea of the present invention, various changes can be made according to the design and the like.

(Implementation form)

Hereinafter, the person detection system 1 of this embodiment will be described with reference to FIGS. 1 to 6.

(1) Summary

The human detection system 1 detects, for example, the presence of a human 91 (human body) in a first detection area 81 (refer to FIGS. 2 and 3) set in a corridor of a building, an office, a living room of a house, and the like. The human detection system 1 is based on the received light intensity of infrared rays from the first detection area 81 and a plurality of (here, four) set around the first detection area 81 and the second detection area 82 (refer to Figs. 2 and 3) The change of, detects the presence of no one 91 in the first detection area 81. That is, the human detection system 1 detects the presence of a human 91 in the first detection area 81 based on the change in the received light intensity of infrared rays. The infrared change is caused by the person 91 passing through at least one of the plurality of second detection areas 82. The entry of the 2 detection region 82 into the first detection region 81 or the exit of the person 91 from the first detection region 81 toward at least one of the plurality of second detection regions 82 occurs. In addition, the human detection system 1 detects the presence of a human 91 in the first detection area 81 based on a change in the received light intensity of infrared rays caused by the micro-movement or large activity of the person 91 in the first detection area 81. The “micromotion” mentioned here refers to the relatively small activities of the person 91 such as the shaking of the body caused by the breathing action of the person 91, and the physical activity of the person 91. Furthermore, in this embodiment, the presence of no one 91 is detected based on the change in the received light intensity of infrared rays generated by the micro-movement of the person 91 in the first detection area 81. Existence is called stay detection. The detection of the presence of the human 91 based on the change in the received light intensity of the infrared rays generated by the entry of the person 91 through the second detection area 82 into the first detection area 81 is referred to as entry detection. In addition, the detection of the presence of the presence of the person 91 based on the change in the received light intensity of the infrared rays generated when the person 91 exits from the first detection area 81 toward the second detection area 82 is referred to as exit detection.

The human detection system 1 detects whether the state of the first detection area 81 is an existing state or a non-existent state. The "presence state" mentioned here refers to the state where the person 91 exists in the first detection area 81. The "non-existent state" is a state in which the person 91 does not exist in the first detection area 81. Therefore, in a state where the person 91 does not exist in the first detection area 81, the detection result of the person detection system 1 becomes the "non-existent state". When the person 91 enters the first detection area 81, the detection result of the person detection system 1 changes from the "non-existent state" to the "existent state". After that, the person 91 stays between the first detection areas 81, and the detection result of the person detection system 1 maintains the "presence state". When the person 91 exits from the first detection area 81, that is, when the person 91 becomes non-existent in the first detection area 81, the detection result of the human detection system 1 changes from the "existence state" to the "nonexistence state".

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

In this embodiment, as an example, the human detection system 1 can communicate with the lighting control system 40 (refer to FIG. 1). The lighting control system 40 includes a lighting fixture 41 (see FIG. 1 and FIG. 2) installed in the first detection area 81, and a control device 42 (see FIG. 1) that controls the lighting fixture 41. The human detection system 1 determines whether it is necessary to light the lighting fixture 41 based on the detection result of the human detection. The judgment 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 judgment result of the human detection system 1. The control device 42 may also be a switch that is inserted into the power supply line to the lighting fixture 41 to turn on/off the energization of the lighting fixture 41. In this way, the person detection system 1 of this embodiment is used to determine whether there is no person 91 in the first detection area 81. There is a lighting control system 40 that controls the lighting fixture 41. That is, in this embodiment, the first detection area 81 is a control target area for controlling the load (lighting fixture 41). When the person detection system 1 determines that the person 91 enters the first detection area 81 through the second detection area 82, and the person 91 stays in the existence state of the first detection area 81, the lighting fixture 41 is turned on. When the person detection system 1 determines that the person 91 has exited the first detection area 81 and passed through the second detection area 82, and the non-existent state of the person 91 does not exist in the first detection area 81, the lighting fixture 41 is turned off. Thereby, the useless power consumption caused by forgetting to turn off the lighting fixture 41 can be suppressed.

(2) Composition

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

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

In the present embodiment, with the first focal electric sensor 11 as a center, four second focal electric sensors 12a to 12d are arranged at equal intervals around it. That is, the first focal electric sensor 11 is arranged at a position inside the four second focal electric sensors 12.

The first focal sensor 11 is arranged in the vertical direction. The first pyroelectric sensor 11 receives infrared rays from the first detection area 81. The shape of the first detection area 81 when viewed from the top plate side is Round (refer to Figure 3).

Each second pyroelectric sensor 12 is inclined with respect to the vertical direction, and is arranged in a direction outside 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 as each other, and include areas that are different from each other. 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 overlapping area 820 that overlaps with a partial area of another adjacent second detection area 82. Each second detection area 82 includes two overlapping areas 820. That is, around the first detection area 81, there are four overlapping areas 820 in which two adjacent second detection areas 82 partially 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 outer shape of the area formed by combining the four second detection areas 82a to 82d is a quadrilateral, and the first detection area 81 is located inside.

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

Each pyroelectric sensor 10 (a first pyroelectric sensor 11, a plurality of second pyroelectric sensors 12) has a light-receiving element 101, a conversion circuit 102, an amplifier circuit 103, and A/D (analog to digital) Converter 104. The light receiving element 101 is a pyroelectric element, and outputs a signal (electric signal) corresponding to the change in the intensity of the infrared light received from the corresponding detection area. The conversion circuit 102 converts the electrical signal output from the light receiving element 101 from a current signal to a voltage signal. The amplifier circuit 103 amplifies the voltage signal output from the conversion circuit 102. The A/D converter 104 converts the 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 (refer to FIG. 2). The optical system 15 includes a lens, a mirror, or a combination of these, and condenses infrared rays from the first detection area 81 and the second detection areas 82a to 82d to the light receiving element 101 corresponding to each detection area.

The detection device 30 has a plurality of (here, five) buffers for pyroelectric power 301, a plurality of (here, five) filter units for pyroelectric power 302, a memory section 303, a control section 304, and an output section 305.

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

In this embodiment, the detection device 30 includes, for example, a microcomputer with a processor and a memory. Furthermore, the microcomputer functions as the control unit 304 by executing the program stored in the memory by the processor. The program executed by the processor is pre-recorded in the memory of the microcomputer, but it can be recorded on a non-temporary recording medium such as a memory card, and can also be provided through telecommunication lines such as the Internet.

The signal output from each light receiving element 101 is input to the control unit 304 via the conversion circuit 102, the amplifier circuit 103, the A/D converter 104, the pyroelectric buffer 301, and the pyroelectric filter unit 302. Specifically, a plurality of pyroelectric sensors 10 have a light receiving element 101, and output an output signal V corresponding to a change in the received light intensity of infrared rays from the corresponding detection area to the detection unit 310 described below (refer to FIG. 1). Specifically, the first pyroelectric sensor 11 outputs the output signal V1 corresponding to the change in the received light intensity of infrared rays from the first detection area 81 to the detection unit 310. The four second pyroelectric sensors 12 (12a~12d) ) Output signals V2 (V2a to V2d) corresponding to changes in the intensity of infrared rays received from the second detection area 82 (82a to 82d) to the detection unit 310, respectively.

The pyroelectric filter unit 302 extracts AC components from the output of the pyroelectric sensor 10. The frequency band passing through the pyroelectric filter unit 302 is set to, for example, 0.3 Hz to 1 Hz. The output of each pyroelectric filter unit 302, that is, the output signals V1 and V2, respectively become AC signals from which low-frequency components (including DC components) are removed.

Here, the pyroelectric filter section 302 that receives the output from the first pyroelectric sensor 11 may pass through different frequency bands (passbands) when performing stay detection and when performing entry detection. In other words, the pyroelectric filter unit 302 can also switch the passband when performing stay detection and when performing entry detection. In the case of performing stay detection, regarding the output signal V1 output from the first pyroelectric sensor 11, the pass band of the pyroelectric filter section 302 is set to, for example, 0.3 Hz to 1 Hz as described above. On the other hand, in the case of entering detection, regarding the output signal V1 output from the first pyroelectric sensor 11, the pass band of the pyroelectric filter section 302 is set to a frequency band with a center frequency around 1 Hz, for example. In addition, regarding the output signal V2 output from the second pyroelectric sensors 12a to 12d, the pass band of the pyroelectric filter section 302 is set to a frequency band with a center frequency around 1 Hz, for example.

The memory part 303 has a selection from ROM (Read Only Memory), RAM (Random Access Memory, random access memory), or EEPROM (Electrically Erasable Programmable Read Only Memory), which is electronically erasable and programmable. Memory) and other components.

The memory unit 303 stores the threshold value used for the detection of the person 91 for each pyroelectric sensor 10. Specifically, the storage unit 303 stores the first movement detection threshold (third threshold) and the stay detection threshold (first threshold) for the detection of the person 91 using the first focal electrical sensor 11. In addition, the storage unit 303 stores the second threshold value for movement detection (the second threshold value) for detecting the person 91 for each of the plurality of second focal electrical sensors 12. Furthermore, the memory unit 303 memorizes as the stop of the first focal electrical sensor 11 Leave the minimum value (minimum threshold) set for the detection threshold. In this embodiment, the first threshold value for movement detection and the second threshold value for movement detection are the same values as each other, but they may be different values from each other. In addition, in this embodiment, the plurality of second motion detection thresholds corresponding to the plurality of second focal electrical sensors 12 have the same value as each other, but they may have different values from each other.

In addition, the storage unit 303 stores a threshold value (control threshold value) for forcibly controlling the lighting control system 40 in the first focal electrical sensor 11 (here, the control is performed by turning off). In this embodiment, the control threshold value is a value smaller than the first movement detection threshold value, and is a value larger than the stay detection threshold value.

Furthermore, the storage unit 303 stores the first determination time length corresponding to the stay detection threshold value, the second determination time length corresponding to the control threshold value, and the third determination time corresponding relationship to the first movement detection threshold value. long time. Here, the first judgment time length is the shortest, and the third judgment time length is the longest. For example, the first judgment time length is 1 minute, the second judgment time length is 10 minutes, and the third judgment time length is 15 minutes. In addition, these values are just an example, and are not limited to these values.

As shown in FIG. 1, the control unit 304 has a detection unit 310 and an instruction unit 311.

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 whether the state of the first detection area 81 is the "presence state" in which the person 91 exists in the first detection area 81 and the "non-existence state" in which the person 91 does not exist in the first detection area 81.

The operation mode of the detection unit 310 (ie, the operation mode of human detection) includes an entry detection mode and a stay detection mode. The entry detection mode is an action mode used to detect that no one 91 enters the first detection area 81. The stay detection mode is an action mode used to detect the exit of no one 91 from the first detection area 81, in other words, it is used to detect a person in the first detection area 81 91 is the action mode of existence or not. That is, the detection unit 310 performs entry detection in the entry detection mode, and performs stay detection and exit detection in the stay detection mode.

As shown in FIG. 1, the detection unit 310 has a determination unit 320 and a change unit 321.

When entering the detection mode, the judging unit 320 sets the first movement detection threshold stored in the memory unit 303 to the first focal electrical sensor 11 as a judgment for judging whether the state of the first detection area 81 is the "existing state" Use threshold.

When entering the detection mode, the determining unit 320 determines whether the output value of the output signal V1 of the first focal electrical sensor 11 exceeds the first threshold for movement detection. When the determination unit 320 determines that the output value of the output signal V1 exceeds the first movement detection threshold value, it determines that the person 91 has entered the first detection area 81, that is, determines that it 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 value in the entry detection mode, it determines that the person 91 has not entered the first detection area 81, that is, it determines that it is not present. .

The determination unit 320 changes the operation mode from the entry detection mode to the stay detection mode when determining that the state is present in the entry detection mode. At this time, in the stay detection mode, the determination section 320 sets the stay detection threshold stored in the memory section 303 for the first focal electrical sensor 11 as a method for determining whether the state of the first detection area 81 is the "existing state" Threshold for judgment.

When the determination unit 320 determines that there is a person 91 in the first detection area 81, if it is determined based on the output value of the output signal V2 of the second focal electrical sensor 12 that the person 91 exists in the second detection area 82, it is determined as The person 91 has exited from the first detection area 81. That is, in the stay detection mode, the determination unit 320 determines whether the output value of the output signal V1 of the first focal electrical sensor 11 exceeds the threshold value for stay detection. In the stay detection mode, the determination unit 320 determines that the person 91 stays when the output value of the output signal V1 of the first focal electrical sensor 11 exceeds the stay detection threshold. In the first detection area 81, that is, it is determined to be in an existing state.

In the stay detection mode, the determination unit 320 starts to count the exit determination time stored in the memory unit 303 when it is determined that the output value of the output signal V1 of the first focal electrical sensor 11 exceeds the stay detection threshold. The judging unit 320 judges whether the output value of at least one output signal V2 among the output signals V2a~V2d of the four second focal electrical sensors 12a~12d exceeds the corresponding second movement detection use during the period until the exit judgment time has elapsed. Threshold. The judging unit 320 judges that the output value of at least one output signal V2 among the output signals V2a~V2d of the four second focal electrical sensors 12a~12d exceeds the corresponding second movement detection during the period until the exit judgment time elapses. In the case of the threshold value, it is determined that the person 91 has exited from the first detection area 81, that is, it is determined that the person 91 does not exist. When determining that the person 91 does not exist in the first detection area 81, the determination unit 320 sets the first movement detection threshold value for the first focal electrical sensor 11 as the determination threshold value. At this time, the determination unit 320 changes the operation mode from the self-stay detection mode to the entry detection mode. Here, the exit determination time is, for example, 10 seconds.

In more detail, when the judging unit 320 is in the stay detection mode, when it is determined that the output value of the output signal V1 of the first focal electrical sensor 11 exceeds the stay detection threshold, it starts counting the exit judgment time. The judging unit 320 judges that when the output value of at least one output signal V2 among the output signals V2a~V2d exceeds the corresponding second threshold for movement detection during the period from the start of the timing to the elapse of the exit judgment time, it is judged that the The 1 detection area 81 exits and does not exist therein, that is, it is determined to be in a non-existent state. When determining that the person 91 does not exist in the first detection area 81, the determination unit 320 sets the first movement detection threshold value for the first focal electrical sensor 11 as the determination threshold value. At this time, the determination unit 320 changes the operation mode from the self-stay detection mode to the entry detection mode. In addition, during the period from the start of timing to the elapse of the exit determination time, the output value of at least one output signal V2 among the output signals V2a~V2d does not exceed the corresponding second movement detection When the threshold value is used, it is determined that the person 91 has not exited from the first detection area 81 but stayed, that is, it is determined that the person 91 is in a state of being. At this time, the determination unit 320 resets the timing of the exit determination time, and determines again whether the output value of the output signal V1 exceeds the stay detection threshold. The determination unit 320 starts counting the exit determination time when it determines that the output value of the output signal V1 exceeds the threshold value for stay detection. Furthermore, the timing of the exit judgment time can be counted up from the value "0" to the length of the exit judgment time, or it can be counted down from the time of the exit judgment time to the value "0".

In addition to the exit determination described above, the determination unit 320 also uses the non-existence determination time memorized by the storage unit 303 in the stay detection mode to determine the presence or absence of the person 91 in the first detection area 81.

The determination unit 320 determines whether the output value of the output signal V1 of the first focal electrical sensor 11 is always lower than the stay detection threshold value during the period until the absence determination time elapses. When the output value of the output signal V1 is always lower than the threshold value for stay detection within the absence determination time, the determination unit 320 determines that the person 91 does not exist in the first detection area 81, that is, determines that it is a non-existent state. When determining that the person 91 does not exist in the first detection area 81, the determination unit 320 sets the first movement detection threshold value for the first focal electrical sensor 11 as the determination threshold value. At this time, the determination unit 320 changes the operation mode from the self-stay detection mode to the entry detection mode. Here, the non-existence determination time is, for example, 1 minute.

In more detail, in the stay detection mode, when the output value of the output signal V1 of the first focal electrical sensor 11 is lower than the threshold value for stay detection, the judging unit 320 starts to store it as the non-existence judging time by the memory unit 303 The time until the first judgment time is long is counted. For example, the determination unit 320 uses the first timer to count the first determination time period. During the period from the start of the time counting by the first timer to the non-existence determination time elapsed by the determination unit 320, the output value of the output signal V1 of the first focal electrical sensor 11 is always lower than the stay detection threshold In this case, it is determined that the person 91 does not exist in the first detection area 81, that is, it is determined that the person 91 does not exist. When the judging unit 320 uses the first timer to measure the time from the start to the absence of judging time, when the output value of the output signal V1 of the first focal electrical sensor 11 exceeds the threshold for stay detection, It is determined that the person 91 is present in 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 time counting performed by the first timer. In this way, continue to stay in the detection mode. Furthermore, the non-existence judgment time counted by the first timer can be counted up from the value "0" to the long first judgment time (the long time for the non-existence judgment time), or it can be as long as the first judgment time The value "0" counts down.

In addition, in the stay detection mode, the judging unit 320 judges the output of the output signal V1 of the first focal electrical sensor 11 during the long period of the second judging time memorized by the memory unit 303 for the first focal electrical sensor 11 Is the value always lower than the control threshold. The determination unit 320 determines that there is no human in the first detection area 81 when the output value of the output signal V1 of the first focal electrical sensor 11 is always lower than the control threshold value during the long second determination time period. 91, that is, it is determined to be in a non-existent state. When determining that the person 91 does not exist in the first detection area 81, the determination unit 320 sets the first movement detection threshold value for the first focal electrical sensor 11 as the determination threshold value. At this time, the determination unit 320 changes the operation mode from the self-stay detection mode to the entry detection mode. Here, the second determination time length is, for example, 10 minutes.

In more detail, in the stay detection mode, for the first focal electrical sensor 11, when the output value of the output signal V1 of the first focal electrical sensor 11 is lower than the control threshold value, the determining unit 320 starts the second determination Time counting up to a long time. For example, the determination unit 320 uses a second timer to count the second determination time period. In the judging unit 320, the output value of the output signal V1 of the first pyroelectric sensor 11 is always lower than the control threshold value between the start of time counting by the second timer and the long period of the second judging time. In case, it is judged as the first detection zone The person 91 does not exist in the domain 81, that is, it is determined to be in a non-existent state. The judging unit 320 re-emphasizes when the output value of the output signal V1 of the first focal electrical sensor 11 exceeds the control threshold value between the start of time counting by the second timer and the second long judging time period. Suppose the time counted by the second timer is used. Furthermore, the time counting up to the long second judgment time of the second timer can be counted up from the value "0" to the second judgment time length, or it can be counted down from the second judgment time to the value "0". The judging unit 320 compares the output value of the output signal V1 with the control threshold during the period until the second judging time is long, and can detect an activity larger than the activity of the person 91 detected using the stay detection threshold.

In the stay detection mode, the judging unit 320 determines whether the output value of the output signal V1 of the first focal electrical sensor 11 is between the long period of the third judging time memorized by the memory unit 303 for the first focal electrical sensor 11 It is always lower than the first threshold for motion detection. The judging unit 320 judges that it is in the first detection area 81 when the output value of the output signal V1 of the first focal electrical sensor 11 is always lower than the first threshold for movement detection during the long period of the third judgment time. The person 91 does not exist, that is, it is determined to be in a non-existent state. When determining that the person 91 does not exist in the first detection area 81, the determination unit 320 sets the first movement detection threshold value for the first focal electrical sensor 11 as the determination threshold value. At this time, the determination unit 320 changes the operation mode from the self-stay detection mode to the entry detection mode. Here, the third determination time length is, for example, 15 minutes.

In more detail, in the stay detection mode, for the first focal electrical sensor 11, when the output value of the output signal V1 of the first focal electrical sensor 11 is lower than the first threshold for movement detection, the determining unit 320 starts Counting the time until the third judgment time is long. For example, the determination unit 320 uses a third timer to count the third determination time period. The judging part 320 is between the start of the time counted by the third timer and the third judging time, the output value of the output signal V1 of the first focal electrical sensor 11 is always lower than that of the first entry detection In the case of the threshold, it is judged as The person 91 does not exist in the first detection area 81, that is, it is determined to be a non-existent state. When the judging unit 320 is between the start of time counting by the third timer and the third judging time period, when the output value of the output signal V1 of the first focal electrical sensor 11 exceeds the first threshold for movement detection , Reset the time counting with the third timer. Furthermore, the counting of the time until the third judgment time of the third timer is long can be counted up from the value "0" to the third judgment time length, or it can be counted down from the third judgment time to the value "0". The judging unit 320 compares the output value of the output signal V1 with the first movement detection threshold during the period until the third judgment time is long, and can detect an activity larger than the activity of the person 91 detected using the control threshold.

In short, the determination unit 320 uses the output value of the output signal V1 of the first focal electrical sensor 11, the threshold value for stay detection, the threshold value for control, and the first threshold value for movement detection, for the first focal electrical sensor 11, in plural ( In the present embodiment, there are 3 types) Sensitivity for human detection.

Regarding the first focal electrical sensor 11, when the output value of the output signal V1 of the first focal electrical sensor 11 exceeds any one of the stay detection threshold, the control threshold, and the first movement detection threshold, the determination unit 320 Reset the long judgment time timer corresponding to the threshold. At this time, the determination unit 320 also resets the determination time length corresponding to the threshold value smaller than the threshold value. For example, when the output value of the output signal V1 of the first focal electrical sensor 11 exceeds the first entry detection threshold value during the third determination time period, the determination unit 320 resets the timer for the third determination time period . At this time, the output value of the output signal V1 of the first focal electrical sensor 11 exceeds both the stay detection threshold and the control threshold. Therefore, the determination unit 320 also resets each of the stay detection threshold and the control threshold. Which corresponds to the timing of the first long judgment time and the second long judgment time.

When one of the longest judgment time, the second longest judgment time, and the third longest judgment time corresponding to each of the stay detection threshold, the control threshold, and the first movement detection threshold, is timed. Time, the determination unit 320 determines that it is in the first detection area 81 The person 91 does not exist, that is, it is determined to be in a non-existent state. In other words, the determination unit 320 outputs the output signal V1 of the first focal electrical sensor 11 within the determination time that is associated with one of the stay detection threshold, the control threshold, and the first movement detection threshold. When the value does not exceed the threshold, it is determined that the person 91 does not exist in the first detection area 81.

For example, when the output value of the output signal V1 of the first focal electrical sensor 11 exceeds the threshold for stay detection during the long period of the first determination time (non-existence determination time), the determination unit 320 determines that the person 91 has not passed the first determination time. The detection area 81 exits, that is, it is determined to be in the existing state, and continues to stay in the detection mode. At this time, noise may be included in the output signal V1 of the first focal electrical sensor 11 due to environmental influences such as temperature, illuminance, and wind in the first detection area 81. Therefore, even though the determination unit 320 determines that the person 91 does not exist in the first detection area 81, the output value of the output signal V1 may exceed the stay detection threshold during the first determination time period. That is, the output signal V1 of the first focal electrical sensor 11 contains noise due to the influence of the environment in the first detection area 81. As a result, the determination unit 320 may erroneously detect that the person 91 is present in the first detection. Area 81.

In addition, the person 91 will be compared with the person 91 detected by the use stay detection threshold during the second long judgment time (here 10 minutes) and the third long judgment time (here 15 minutes). The possibility of large activities is higher. Therefore, in the present embodiment, the determination unit 320 uses the stay detection threshold to detect the stay of the person 91 in the first detection area 81 in the stay detection mode, and within a predetermined time (the second long period of determination time, the second (3) During the long determination time period), other thresholds (threshold for control, threshold for first movement detection) are used to detect the stay of the person 91 in the first detection area 81. The judging unit 320 judges that it is in the second long period of judgment time or the third long period of judgment time when no activity larger than the activity of the person 91 detected by the threshold value for stay detection is detected. 1 The detection area 81 is in a non-existent state.

In this way, the determination unit 320 detects the person 91 even when the threshold value for stay detection is used. In the case of staying, the above-mentioned false detection can also be eliminated by detecting whether there is a larger activity within a predetermined time (within the second judgment time period or the third judgment time period).

When entering the detection mode, the changing unit 321 changes the stay detection threshold stored in the memory unit 303 for the first focal electrical sensor 11 according to the output value of the output signal V1 of the first focal electrical sensor 11.

Specifically, when the changing unit 321 enters the detection mode, it determines whether the output value of the output signal V1 of the first focal electrical sensor 11 exceeds the threshold for stay detection and whether the output value of the output signal V1 of the first focal electrical sensor 11 is lower than the first movement Threshold for detection. When the changing unit 321 determines that the output value of the output signal V1 of the first focal electrical sensor 11 exceeds the stay detection threshold and is lower than the corresponding first movement detection threshold, it detects the stay stored in the memory unit 303 Use the threshold to change it. In more detail, the changing unit 321 changes the stay detection threshold stored in the storage unit 303 to a value larger than the currently set value. Furthermore, the stay detection threshold value is a value smaller than the first movement detection threshold value, and therefore, the stay detection threshold value after the change is also a value smaller than the first movement detection threshold value. In more detail, the changing unit 321 selects the output value of the output signal V1 of the first focal electrical sensor 11 to be the output of the first focal electrical sensor 11 within the first time (for example, 5 seconds) after exceeding the threshold for stay detection. The output value of the maximum value among the output values of the signal V1. The changing unit 321 changes the stay detection threshold stored in the storage unit 303 to a value larger than the selected maximum value.

The changing unit 321 does not change the stay detection threshold when the output value of the output signal V1 of the first focal electrical sensor 11 exceeds the threshold for determination (the first threshold for movement detection) when entering the detection mode. More specifically, when the changing unit 321 enters the detection mode, after the output value of the output signal V1 of the first focal electrical sensor 11 exceeds the threshold value for stay detection, the output value exceeds the threshold value for determination within the first time (first movement In the case of the detection threshold), the stay detection threshold will not be changed.

Furthermore, when the changing unit 321 enters the detection mode, it determines whether the output value of the output signal V1 from the first focal electrical sensor 11 is always lower than the stay detection threshold for the first focal electrical sensor 11 within the second time. When the changing unit 321 determines that the output value of the output signal V1 of the first focal electrical sensor 11 is always lower than the stay detection threshold within the second time, it changes the stay detection threshold stored in the memory unit 303 . In more detail, the changing unit 321 changes the stay detection threshold stored in the storage unit 303 to a value smaller than the currently set value. In this embodiment, the changing unit 321 changes to a value smaller than the currently set value and larger than the maximum output value within the second time. Here, the second time is, for example, 1 minute.

When the determination unit 320 determines that the presence state, that is, when the person 91 has entered the first detection area 81, in the first focal electrical sensor 11, the stay detection threshold stored in the memory unit 303 is set as the determination Use threshold. At this time, the determination unit 320 changes the operation mode from the entry detection mode to the stay detection mode.

In addition, after it is determined that there is no state in the first detection area 81, and the operation mode is changed from the stop detection mode to the detection mode, the output signal of the first focal electrical sensor 11 is within a predetermined third time When the output value of V1 exceeds the first threshold for movement detection, the determination unit 320 changes the operation mode from the entry detection mode to the stay detection mode, and starts the stay detection. At this time, the determination unit 320 sets the minimum threshold value in the first focal electrical sensor 11 as the stay detection threshold value and sets the determination threshold value. Here, the third time is, for example, 10 seconds.

The instruction unit 311 outputs a control signal indicating whether it is necessary to light the lighting fixture 41 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 the detection unit 310 is a non-existent state, the instruction unit 311 outputs to the control device 42 a control signal (extinguishing signal) indicating that there is no need to turn on, that is, indicating that it is turned off. The indicating unit 311 will indicate that it needs to be lit when the detection result of the detecting unit 310 is present, that is, The control signal (lighting signal) indicating lighting is output to the control device 42.

The instruction unit 311 is configured to be able to control the lighting fixture 41 by transmitting a control signal. That is, the instruction unit 311 corresponds to the load control unit of the present invention.

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

(3) Action

Next, referring to FIG. 4, the operation of the person detection system 1 of the present embodiment, especially the entry detection and the exit detection will be described. Here, it is assumed that the person 91 enters the first detection area 81 through the second detection area 82a, and exits from the first detection area 81.

In FIG. 4, the change of the output value of the output signal V1 of the first focal electrical sensor 11 along the time axis, the change of the output value of the output signal V2a of the second focal electrical sensor 12a, and the utilization determination section are shown The change in the judgment result of the existence or not obtained by 320. In addition, in FIG. 4, Th11 represents the first movement detection threshold value, Th12 represents the stay detection threshold value, and Th21 represents the second movement detection threshold value.

The determination unit 320 determines whether the output signal V1 of the first focal electrical sensor 11 exceeds the first movement detection threshold Th11 when entering the detection mode.

At time t1, the person 91 passes through the second detection area 82a in order to enter the first detection area 81. Therefore, the output value of the output signal V2a of the second pyroelectric sensor 12a exceeds the second threshold value Th21 for movement detection. 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 focal electrical sensor 11 is lower than the first movement detection threshold Th11. Therefore, at time t1, the determination unit 320 determines that the person 91 does not exist in the first detection area 81, that is, determines that it is in a non-existent state.

At time t2, the person 91 enters the first detection area 81 through the second detection area 82a, and therefore, the output value of the output signal V1 of the first focal electrical 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, determines that the person 91 is present. The human detection system 1 outputs a control signal (lighting signal) indicating lighting to the control device 42. Thereby, the lighting fixture 41 lights up.

In addition, the determination unit 320 changes the determination threshold of the first focal electrical sensor 11 from the first movement detection threshold Th11 to the stay detection threshold Th12 at time t2. Furthermore, the detection unit 310 changes the operation mode from the entry detection mode to the stay detection mode.

In the stay detection mode, the determination unit 320 determines whether the output value of the output signal V1 of the first focal electrical sensor 11 is lower than the stay detection threshold. When the determination unit 320 determines that the output value of the output signal V1 is lower than the threshold value for stay detection, it starts counting the non-existence determination time. The determination unit 320 determines whether the output value of the output signal V1 of the first focal electrical sensor 11 is always lower than the stay detection threshold value during the period until the absence determination time elapses.

In FIG. 4, the output value of the output signal V1 of the first focal electrical sensor 11 is lower than the threshold value Th12 for stay detection set as the threshold value for determination from time t3 to time t4 when the first determination time has elapsed, and the signal is output The output value of V1 exceeds the threshold value Th12 for stay detection. Therefore, the determining unit 320 determines that it is in the existing state, and continues to stay in the detection mode. In addition, the judging unit 320 resets the time count for the long first judging time. At this time, the human detection system 1 outputs a control signal (lighting signal) indicating lighting to the control device 42.

In the stay detection mode, the determination unit 320 starts to count the exit determination time when it is determined that the output value of the output signal V1 exceeds the stay detection threshold. The judging unit 320 judges whether the output value of at least one of the output signals V2a~V2d of the 4 second focal electrical sensors 12a~12d exceeds the corresponding second movement during the period until the exit judgment time has elapsed Threshold value Th21 for detection.

In FIG. 4, from the time t4 when the output value of the output signal V1 of the first focal electrical sensor 11 exceeds the stay detection threshold Th12 to the elapse of the exit determination time, all the output values of the output signals V2a~V2d are always lower than the second Threshold value Th21 for movement detection. Therefore, the determination unit 320 determines that the person 91 has not exited the first detection area 81, that is, determines that the person 91 is in a state of being. 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 focal electrical sensor 11 exceeds the stay detection threshold Th12 due to the activity of the person 91 who wants to exit the first detection area 81 by the person 91. From time t5 to time t6 during which the exit determination time has elapsed, the person 91 exits from the first detection area 81 and passes through the second detection area 82a. Therefore, the output value of the output signal V2a of the second pyroelectric sensor 12a exceeds the second Threshold value Th21 for movement detection. Therefore, the determination unit 320 determines that the person 91 has exited from the first detection area 81, that is, determines that it is in a non-existent state. The human detection system 1 outputs a control signal (extinguishing signal) indicating extinguishment to the control device 42. Thereby, the lighting fixture 41 is turned off.

In addition, the determination unit 320 changes the threshold value for determination of the first focal electrical sensor 11 from the threshold value Th12 for stay detection to the first threshold value Th11 for movement detection at time t6. Furthermore, the detection unit 310 changes the operation mode from the self-stay detection mode to the entry detection mode.

In addition, when the output value of the output signal V1 of the first focal electrical sensor 11 exceeds the first threshold value Th11 for movement detection in the third time with time t6 as the starting time point, the determination unit 320 enters the operation mode from The detection mode is changed to stay detection mode. At this time, the determination unit 320 sets the minimum threshold value in the first focal electrical sensor 11 as the stay detection threshold value and sets the determination threshold value. Thereby, even when the human detection system 1 makes an error and turns off the lighting fixture 41, if the human 91 is detected within the third time, the lighting can be turned on again.

Next, the setting change of the stay detection threshold Th12 of the first pyroelectric sensor 11 when entering the detection mode will be described with reference to FIG. 5.

In FIG. 5, the change in the output value of the output signal V1 of the first focal electrical sensor 11 along the time axis is shown. Here, the set value "a" is used as the first movement detection threshold Th11, and the set value "b" is used as the initial value of the stay detection threshold Th12. Furthermore, the value "b" is a value smaller than the value "a".

When entering the detection mode, the changing unit 321 determines whether the output value of the output signal V1 of the first focal electrical sensor 11 exceeds the stay detection threshold Th12 and is lower than the first movement detection threshold Th11.

At time t11, the output value of the output signal V1 of the first focal electrical sensor 11 exceeds the value "b" and is lower than the value "a". The changing unit 321 changes the stay detection threshold Th12 stored in the memory unit 303 to a value "c" (time t12) that is larger than the following output value, which is the first time (5 seconds) from time t11 to t12 The maximum value of the output value of the output signal V1 during the period. Thereby, the value "b" as the stay detection threshold Th12 stored in the storage unit 303 is changed to the value "c". Furthermore, the stay detection threshold Th12 is a value smaller than the first movement detection threshold Th11, so the changed value "c" as the stay detection threshold Th12 is also a value that is higher than the first movement detection threshold Th11 "A" is a small value.

At time t13, the output value of the output signal V1 of the first focal electrical sensor 11 exceeds the value "c" and is lower than the value "a". The changing unit 321 changes the stay detection threshold Th12 stored in the memory unit 303 to a value "d" (time t14) greater than the following output value, which is the first time (5 seconds) from time t13 to t14 The maximum value of the output value of the output signal V1 during the period. Thereby, the value "c" which is the threshold value Th12 for stay detection stored in the storage unit 303 is changed to the value "d". Furthermore, the stay detection threshold Th12 is smaller than the first movement detection threshold Th11 Therefore, the changed value "d" as the stay detection threshold Th12 is also a value smaller than the value "a" as the first movement detection threshold Th11.

The changing unit 321 determines whether the output value of the output signal V1 from the first focal electrical sensor 11 is always lower than the stay detection threshold Th12 within the second time when the detection mode is entered.

In FIG. 5, during the period P1 representing the second time (the period from time t14 to t15), the output value of the output signal V1 of the first focal electrical sensor 11 is always lower than the value "d" which is the threshold value Th12 for stay detection . The changing unit 321 changes the stay detection threshold Th12 stored in the memory unit 303 to a value "e", which is smaller than the currently set value "d" and is larger than the maximum output of the output signal V1 in the second time. The larger value. Thereby, the value "d" as the stay detection threshold Th12 memorized by the storage unit 303 is changed to the value "e".

Next, use FIG. 6 to compare the stay detection threshold Th12 when the output value of the output signal V1 of the first focal electrical sensor 11 exceeds the value "b" and is lower than the value "a" when entering the detection mode. The actions related to the change are explained. Here, the case where the value "b" which is the threshold value Th12 for stay detection is changed to the value "c" will be described.

The changing unit 321 detects that at the time t11, the output value of the output signal V1 of the first focal electrical sensor 11 exceeds the value "b" and is lower than the value "a". The changing unit 321 acquires the maximum value “b1” among the output values of the output signal V1 of the first focal electrical sensor 11 during the period P2 from time t11 to t12 which is the first time.

The changing unit 321 changes the value "b" stored in the storage unit 303 as the stay detection threshold Th12 to a value "c" which is larger than the acquired value "b1" at time t12.

(4) Advantages

In the previous human detection system that only monitors one detection area, when the output value of the output signal of the focal sensor is always lower than the threshold within a specified time, it is determined that the detection area is in a non-existent state, After the actual person exits from the detection area, it may take time until it is judged to be non-existent.

Therefore, in the person detection system 1 of this embodiment, the first detection area 81 that is the control target area for controlling the lighting fixture 41 (load), and the second detection area 82 including the periphery of the first detection area 81 are performed. Surveillance. In this embodiment, an area formed by merging a plurality of second detection areas 82 surrounds the first detection area 81. Therefore, the person 91 passes through the second detection area 82 in order to enter the first detection area 81. In addition, when the person 91 exits from the first detection area 81, it enters the second detection area 82. The human detection system 1 uses the output value of the output signal V2 of the second focal electrical sensor 12 in the stay detection mode to determine whether the human 91 has exited the first detection area 81. That is, in the person detection system 1 of this embodiment, 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 can be detected. In other words, the first detection that is different from each other can be detected. The movement of the person 91 between the area 81 and the second detection area 82. Therefore, in the person detection system 1 of this embodiment, the time required to determine whether the person 91 has exited the first detection area 81 can be shortened. Therefore, it is possible to shorten the time from when the person 91 exits from the first detection area 81 to turning off the lighting fixture 41, and it is possible to suppress useless power consumption.

In addition, in this embodiment, an area formed by merging a plurality of second detection areas 82 surrounds the first detection area 81. Therefore, when the person 91 exits from any direction in the first detection area 81, the human detection system 1 can detect the exit of the person 91 from the first detection area 81.

(5) Variation example

Hereinafter, the modification examples are listed. Furthermore, the modified examples described below can be appropriately combined with the above-mentioned embodiments and applied.

(5-1) Variation example 1

In the above-described 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 focal electrical sensor 11, but it is not limited to this configuration. The determination unit 320 may also determine whether the person 91 has entered the first detection area 81 based on the output value of the output signal V1 of the first focal electrical sensor 11 and the output value of the output signal V2 of the second focal electrical sensor 12.

In this case, when the determination unit 320 detects the entry of the person 91 into the first detection area 81, it determines whether or not the person 91 exists in the second detection area 82 based on the output value of the output signal V2 of the second pyroelectric sensor 12. After determining that the person 91 is present in the second detection area 82, the determining unit 320 determines whether the person 91 has entered the first based on the output value of the output signal V1 of the first focal electrical sensor 11 during the period until the entry determination time has elapsed. Detection area 81.

In more detail, when the determination unit 320 enters the detection mode, it determines whether the output value of at least one of the output signals V2a~V2d of the four second focal electrical sensors 12a~12d exceeds the second threshold for movement detection. . When the judging unit 320 judges that the output value of at least one of the output signals V2a~V2d of the 4 second focal electrical sensors 12a~12d exceeds the second threshold for movement detection, it starts to be memorized in the memory unit 303 Enter the timing of the judgment time. The determination unit 320 determines whether the output value of the output signal V1 of the first focal electrical sensor 11 exceeds the first threshold for movement detection during the period until the entry determination time has elapsed. The determination unit 320 determines that the person 91 has entered the first detection area 81 when the output value of the output signal V1 exceeds the first movement detection threshold value before the entry determination time elapses, that is, determines that the person 91 is in the presence state. The judging unit 320 has the output value of the output signal V1 not exceeding the first In the case of 1 threshold for movement detection, it is determined that the person 91 has not entered the first detection area 81, that is, it is determined that it does not exist. 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 in order to enter the first detection area 81. Therefore, the output value of the output signal V2a of the second pyroelectric sensor 12a exceeds the second movement detection Use the threshold Th21. When the output value of the output signal V2a of the second pyroelectric sensor 12a exceeds the second threshold value Th21 for movement detection, the determination unit 320 starts counting the entry determination time. From time t1 to time t2 when the entry determination time has elapsed, the person 91 enters the first detection area 81. Therefore, the output value of the output signal V1 of the first focal electrical 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, determines that the person 91 is present. The human detection system 1 outputs a control signal (lighting signal) indicating lighting to the control device 42. Thereby, the lighting fixture 41 lights up.

In this way, in this modified example, it is determined whether the person 91 enters the first detection area 81 based on the output value of the output signal V1 of the first focal electrical sensor 11 and the output value of the output signal V2 of the second focal electrical sensor 12 . Therefore, the accuracy of determining whether or not the person 91 has entered the first detection area 81 can be improved.

(5-2) Variation 2

In the above embodiment, in the stay detection mode, 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 focal electrical sensor 11 exceeds the stay detection threshold. , But not limited to this structure.

Here, it is assumed that the first detection area 81 and the second detection area 82 do not overlap. The judging unit 320 can also determine whether the person 91 stays in the stay detection mode based on the output value of the output signal V1 of the first focal electric sensor 11 and the output value of the output signal V2 of the second focal electric sensor 12 1 Detection area 81.

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

Thereby, it is possible to improve the accuracy of determining whether the person 91 in the first detection area 81 stays (exists).

(5-3) Variation 3

In the above embodiment, the determination unit 320 determines whether the output value of the output signal V1 of the first focal electrical sensor 11 exceeds the threshold for stay detection in the stay detection mode. In addition, after determining that the output value of the output signal V1 exceeds the threshold value for stay detection, the determining unit 320 determines that one of the output signals V2a~V2d of the four second focal electrical sensors 12a~12d during the period until the exit determination time has elapsed Whether the output value of at least one output signal V2 exceeds the corresponding second threshold for movement detection. The determination unit 320 determines that the person 91 has exited from the first detection area 81 when the output value of any output signal V2 exceeds the second threshold for movement detection during the elapse of the exit determination time, but it is not limited to this .

The determination unit 320 may also determine that the person 91 has moved from the first detection area 81 when the output value of the output signal V1 is lower than the stay detection threshold after the output value of any output signal V2 exceeds the second threshold for movement detection. drop out.

In this case, the determination unit 320 determines whether the output value of the output signal V1 of the first focal electrical sensor 11 exceeds the threshold for stay detection in the stay detection mode. Furthermore, after determining that the output value of the output signal V1 exceeds the threshold value for stay detection, the determining unit 320 determines that the 1 During the period until the exit determination time, whether the output value of at least one output signal V2 among the output signals V2a~V2d of the four second focal electrical sensors 12a~12d exceeds the corresponding second movement detection threshold. When the output value of any output signal V2 exceeds the second threshold for movement detection during the period until the first exit determination time has elapsed, the determination unit 320 starts counting the second exit determination time. The determination unit 320 determines whether the output value of the output signal V1 of the first focal electrical sensor 11 is always lower than the stay detection threshold during the period until the second exit determination time has elapsed. After the output value of any one of the output signals V2 exceeds the second threshold for movement detection, the determination section 320, when the output value of the output signal V1 is always lower than the threshold for stay detection during the period of the second exit determination time, It is determined that the person 91 has exited from the first detection area 81. In addition, after the output value of any output signal V2 exceeds the second threshold for movement detection, the determination unit 320, when the output value of the output signal V1 exceeds the threshold for stay detection during the period until the second exit determination time has elapsed, It is determined that the person 91 is staying in the first detection area 81, that is, it is determined that the person 91 is in a state of being. Here, the second exit determination time is, for example, 15 seconds.

In this modified example, it is possible to reduce the possibility of erroneously determining that the person 91 has exited from the first detection area 81 when the person 91 stays in the first detection area 81.

(5-4) Variation 4

In the above-mentioned embodiment, as shown in FIG. 3, the first detection area 81 is surrounded by the combined area of the four second detection areas 82a to 82d, but it is not limited to this.

The area formed by merging a plurality of second detection areas 82 may also have a structure including a part of the periphery of the first detection area 81. That is, there may be an area where the second detection area 82 does not exist around the first detection area 81. For example, when there is a first detection area 81 at the end of a corridor, etc., and the direction of entry to the first detection area 81 is restricted, only the circumference of the first detection area 81 It is sufficient to include the second detection area 82 in an area that can enter the first detection area 81. That is, the second detection area 82 may not be included in the area around the first detection area 81 that cannot enter the first detection area 81 due to a wall or the like.

Furthermore, in the example of FIG. 3, each second detection area 82 includes an overlap area 820 that overlaps with a partial area of the other second detection area 82, but the second detection area 82 may not include the overlap area 820. For example, the plurality of second detection areas 82 may be adjacent to each other, or there may be gaps between the plurality of second detection areas 82.

In addition, 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, or may overlap with the first detection area There is a gap between 81.

In addition, the outer shape of the first detection area 81 and the second detection area 82 shown in FIG. 3 is an example, and is not limited to this. For example, the outer shape of the first detection area 81 is not limited to a circle, and it may be a quadrilateral for example. In addition, the outer shape of the second detection area 82 may be, for example, a quadrangular shape. In addition, the outer shape of the plurality of second detection regions 82 may have different shapes and sizes from each other.

In addition, the number of second detection areas 82 is not limited to four, and may be one, or two, three, or five or more. That is, the number of the second focal electrical detectors 12 is not limited to four, and may be one, or two, three, or five or more.

(5-5) Variation example 5

In the above-mentioned embodiment, the load to be controlled based on the detection result of the presence or absence of the person in the first detection area 81 is referred to as the lighting appliance 41, but the controlled load may also be an air conditioner.

In this situation, the human detection system 1 controls the air-conditioning equipment by setting the air-conditioning equipment to the ON state when it detects the "presence state". In the case of "existing state", the air-conditioning equipment is controlled by setting the air-conditioning equipment to the OFF state.

(5-6) Variation 6

In the above-described embodiment, the human detection system 1 is configured to include a plurality of pyroelectric sensors 10, but it is not limited to this configuration. The human detection system 1 may also be a configuration that does not include a plurality of pyroelectric sensors 10, that is, a configuration that only includes the detection device 30.

(5-7) Variation example 7

In the above-mentioned embodiment, the human detection system 1 is configured to include the pyroelectric sensor 10 as a sensor for human detection, but it is not limited to this configuration. The human detection system 1 may also have a thermal image sensor as a sensor for human detection.

In addition, the determination unit 320 is configured to use the entry detection threshold (the first movement detection threshold), the control threshold, and the Threshold for stay detection. However, it is not limited to this structure. The judging unit 320 can also use one or two of the entry detection threshold, the control threshold, and the stay detection threshold, and the entry detection threshold when performing human detection with three sensitivities in the stay mode. , Two or one threshold value which is different from the threshold value for control and the threshold value for stay detection. Alternatively, when the determination unit 320 performs human detection with three sensitivities in the stay mode, three threshold values different from the entry detection threshold, the control threshold, and the stay detection threshold may be used.

In addition, when the determination unit 320 performs human detection with two types of sensitivities as plural types of sensitivities in the stay mode, two threshold values of the entry detection threshold, the control threshold, and the stay detection threshold may also be used. Or, the determination unit 320 performs the operation with two kinds of sensitivity when in the stay mode In the case of human detection, one of the entry detection threshold, control threshold, and stay detection threshold, and a threshold different from the entry detection threshold, control threshold, and stay detection threshold can also be used. Alternatively, the determination unit 320 may use two threshold values that are different from the entry detection threshold, the control threshold, and the stay detection threshold when performing human detection with two sensitivities in the stay mode.

In addition, when the determination unit 320 performs human detection with 4 or more sensitivities, which are plural kinds of sensitivities, the 4 or more thresholds used for stay detection may include entry detection threshold, control threshold, and stay detection. Use at least one of the thresholds. Alternatively, the four or more thresholds used for stay detection may be different from the entry detection threshold, the control threshold, and the stay detection threshold.

In addition, in the above-described embodiment, the changing unit 321 is configured to change the stay detection threshold based on the signal of the pyroelectric sensor 10 when entering the detection mode, but it is not limited to this configuration. The changing part 321 may also set the threshold for stay detection to a fixed value, and correct the output value of the focus sensor 10 in the stay detection mode.

(Other changes)

The above-mentioned embodiment is only one of various embodiments of the present invention. As long as the above-mentioned embodiment can achieve the purpose of the invention, various changes can be made according to the design and the like. In addition, the same function as the determination unit 320 in the human detection system 1 can also be realized by a recording medium that records human detection methods, computer programs, or programs. One aspect of the person detection method of the person detection system includes a determination step. In the determination step, the first sensor (the first pyroelectric sensor 11) for detecting the human body (person 91) in the first detection area 81 and the surrounding area including the first detection area 81 are received The second sensor (the second focus) for detecting the human body (person 91) in the second detection area 82 of at least a part of the area The signal of the inductor 12). In the determination step, at least the output value of the first sensor (the first pyroelectric sensor 11) is used to determine the presence of the human body (person 91) in the first detection area 81. In the determination step, at least the output value of the second sensor (the second pyroelectric sensor 12) is used to determine the exit of the human body (person 91) from the first detection area 81.

One aspect of the program is a program for making the computer system function as the above-mentioned human detection system 1.

The person detection system 1 in the present invention includes a computer system. The computer system is mainly composed of processor and memory as hardware. The processor executes the program recorded in the memory of the computer system to realize the function of the human detection system 1 in the present invention. The program can be pre-recorded in the memory of the computer system, can be provided through a telecommunication line, or can be recorded on a non-transitory recording medium such as a memory card, optical disc, and hard disk drive that can be read by the computer system. The processor of a computer system includes one or more electronic circuits including semiconductor integrated circuits (IC) or large integrated circuits (LSI). The integrated circuits such as IC or LSI mentioned here are called differently according to the degree of integration, including those called system LSI, VLSI (Very Large Scale Integration), or ULSI (Ultra Large Scale) Integration, a very large integrated circuit) of the integrated circuit. Furthermore, the logic element can also be used as a processor. The logic element can be used to restructure the FPGA (Field-Programmable Gate Array) or the bonding relationship within the LSI, which is programmed after the LSI is manufactured, or the internal connection of the LSI. Reconstruction of circuit blocks. A plurality of electronic circuits can be assembled on one chip or distributed on a plurality of chips. Multiple chips can be collected in one device or distributed in multiple devices. The computer system described here includes a microcontroller with more than one processor and more than one memory. Therefore, the microcontroller also includes one or more electronic circuits including semiconductor integrated circuits or large integrated circuits.

In addition, it is not a necessary configuration for the human detection system 1 to integrate multiple functions of the human detection system 1 in one housing, and the constituent elements of the human detection system 1 may also be distributed in a plurality of housings. Furthermore, at least part of the functions of the human detection system 1, such as part of the functions of the detection device 30, can also be realized by the cloud (cloud computing) or the like.

For example, the human detection system 1 may also include a human detection device 500 and a server 501 as shown in FIG. 7. 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 in the same manner as in the above-mentioned embodiment. The human detection device 500 further includes an acquiring unit that acquires information corresponding to the output signal V of the plurality of pyroelectric sensors 10. The server 501 has the same function as the control unit 304 of the above-mentioned embodiment.

When the server 501 detects the presence state, it sends control information (lighting information) indicating lighting to the person detection device 500 via the network 502. When the server 501 detects a non-existent state based on the human detection result, it sends the control information (extinguishing information) indicating the extinguishment to the human detection device 500 via the network 502.

When the human detection device 500 receives the lighting information from the server 501 as control information, it outputs the lighting signal as a control signal to the control device 42. When the human detection device 500 receives the turn-off information as the control information from the server 501, it outputs the turn-off signal as the control signal to the control device 42.

In addition, when the server 501 is in the stay detection mode, it determines the exit of the person 91 from the first detection area 81 based on the output value of the output signal V2 of the second focal electrical sensor 12 received from the person detection device 500.

In this way, the person detecting device 500 can control the lighting device 41 to turn on and off by cooperating with the server 501. Furthermore, the server 501 can communicate with the person detection device 500 Jointly detect the exit of the person 91 from the first detection area 81. The person detection system 1 shown in FIG. 7 is, for example, effective for providing information (information from the pyroelectric sensor 10) in the facility to control the lighting equipment in the facility.

(Summary)

The person detection system (1) of the first aspect includes a determination unit (320). The judging unit (320) receives the first sensor (first pyroelectric sensor 11) used for the detection of the human body (person 91) in the first detection area (81), and the second detection area (82). ) Is the signal of the second sensor (the second pyroelectric sensor 12) for the detection of the human body. The second detection area (82) includes at least a part of the area around the first detection area (81). The determination unit (320) uses at least the output value of the first sensor to determine the presence of the human body in the first detection area (81). The determination unit (320) uses at least the output value of the second sensor to determine the withdrawal of the human body from the first detection area (81).

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, the human body passes through the second detection area (82) in order to enter the first detection area (81). In addition, when the human body exits from the first detection area (81), it enters the second detection area (82). The human detection system (1) uses at least the output value of the first sensor to determine the presence of a human body in the first detection area (81), and uses at least the output value of the second sensor to determine the human body from the first detection area (81) ) Of the withdrawal. Therefore, 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) can be detected, in other words, the movement of the human body between two different detection areas can be detected.

In the second aspect of the human detection system (1), as in the first aspect, the determination unit (320) uses at least the output value of the first sensor and the first threshold (threshold for stay detection) to determine the first detection area (81) The stay of the human body. The judging part (320) uses at least the output value of the second sensor and is greater than The second threshold of the first threshold (the second threshold for movement detection) determines the withdrawal of the human body from the first detection area (81).

According to this aspect, the second threshold value which is larger than the first threshold value used to determine the stay of the human body in the first detection area (81) is used to determine the withdrawal of the human body from the first detection area (81). Therefore, it can be lowered to When the human body stays in the first detection area (81), it is erroneously determined that the human body has exited the first detection area (81).

In the third aspect of the human detection system (1), as in the second aspect, when the output value of the first sensor (320) exceeds the first threshold, it determines that it is in the first detection area ( 81) There is a human body.

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

In the fourth aspect of the person detection system (1), as in the second aspect, the second detection area (82) does not overlap with 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, the determination unit (320) determines that there is a human body in the first detection area (81).

According to this aspect, it is possible to improve the accuracy of determining whether there is a human body in the first detection area (81).

In the person detection system (1) according to the fifth aspect, as in any one of the second to fourth aspects, a changing unit (321) is further provided. The changing unit (321) changes the first threshold based on the output value of the first sensor when the determination unit (320) detects the entry of the human body into the first detection area (81).

According to this aspect, in the case of entering detection, the first threshold for stay detection is changed according to the output value of the first sensor, so that the stay detection can be improved. The accuracy. Thereby, the human detection system (1) can reduce the possibility of false detection during stay detection.

According to the environment of the first detection area (81), the signal from the sensor contains noise. At this time, the output value of the first sensor including noise may exceed the threshold for stay detection. Therefore, if a fixed threshold for stay detection is used for stay detection, even when a human body is not present in the first detection area (81), there is a possibility that a human body is present in the first detection area (81). . Therefore, in the case of entering the first detection area (81), by changing the threshold for stay detection according to the output value of the output signal of the first sensor, the possibility of the above-mentioned false detection can be reduced .

In the sixth aspect of the person detection system (1), as in the fifth aspect, when the changing part (321) performs the entry detection in the determining part (320), if the output value of the first sensor exceeds the first Threshold, and lower than the third threshold (first threshold for movement detection) which is larger than the first threshold, the first sensor within the first time since the output value of the first sensor exceeds the first threshold Among the output values, the value whose maximum output value is larger is regarded as the first threshold value. When the changing unit (321) performs entry detection by the judging unit (320), if the output value of the first sensor is lower than the first threshold within the second time, the first threshold is reduced.

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

In the seventh aspect of the human detection system (1), as in the sixth aspect, the determination unit (320) uses a plurality of sensitivities including the first threshold and the third threshold to perform the first detection area ( 81) The detection of the human body. Correspondence between the different judgment time lengths and multiple thresholds. After detecting the entry of the human body into the first detection area (81), the output value of the first sensor does not exceed one during the period until the determination time corresponding to one of the plurality of thresholds has elapsed In the case of the threshold value, the determination unit (320) determines that there is no human body in the first detection area (81).

According to this aspect, the detection accuracy of the presence of the human body in the first detection area (81) can be improved by performing human detection with a plurality of sensitivities.

In the eighth aspect of the human detection system (1), as in any one of the first to seventh aspects, the determination unit (320) further determines whether the human body enters the first based on the output value of the first sensor Detection area (81).

According to this aspect, the entry of the human body into the first detection area (81) can be detected.

In the ninth aspect of the human detection system (1), as in the eighth aspect, when the determination unit (320) detects the entry of the human body into the first detection area (81), it is based on the output value of the second sensor After it is determined that a human body is present in the second detection area (82), it is determined whether the human body has entered the first detection area (81) based on the output value of the first sensor during the period until the entry determination time has elapsed.

According to this aspect, the output value of the first sensor and the output value of the second sensor are used to determine whether the human body enters the first detection area (81). Therefore, it is possible to improve the human body to the first detection area (81). The detection accuracy of entry.

In the tenth aspect of the human detection system (1), as in any one of the first to ninth aspects, the determination unit (320) determines that there is a human body in the first detection area (81), If it is determined based on the output value of the second sensor that there is a human body in the second detection area (82), 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 erroneously determining that a human body has exited the first detection area (81) even though there is no human body in the first detection area (81).

In the eleventh aspect of the human detection system (1), as in the tenth aspect, the period from which the output value of the first sensor is determined to exist in the first detection area (81) until the human body determination time elapses During the period until the exit judgment time, the output value of the second sensor is judged to be in the second When there is a human body in the detection area (82), the determination unit (320) determines that the human body has exited the first detection area (81).

According to this aspect, the output value of the first sensor and the output value of the second sensor are used to determine whether the human body has exited from the first detection area (81). Therefore, it is possible to improve the human body from the first detection area (81). The detection accuracy of exit.

In the person detection system (1) of the twelfth aspect, as in any one of the first to the eleventh aspects, there are a plurality of second sensors. The first detection area (81) is surrounded by an area formed by merging a plurality of second detection areas (82) in a plurality of second sensors.

According to this aspect, when the human body exits from any direction in the first detection area (81), the exit of the human body from the first detection area (81) can be detected.

In the person detection system (1) of the thirteenth aspect, as in any one of the first to the 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, the load can be controlled based on the result of human detection.

In the 14th aspect of the human detection system (1), as in the 13th aspect, the load is a lighting fixture (41). When detecting the presence of a human body in the first detection area (81), the load control unit (instruction unit 311) controls the lighting fixture (41) to turn on the lighting fixture (41). When detecting that there is no human body in the first detection area (81), the load control unit controls the lighting fixture (41) to turn off the lighting fixture (41).

According to this aspect, the lighting equipment (41) can be controlled on and off according to the result of human detection.

In the fifteenth aspect of the person detection system (1), such as any one of the first to the fourteenth aspect, further includes a first focal electrical sensor (11) and a second focal electrical sensor (12) . 1st focal inductance The sensor (11) serves as the first sensor to detect changes in infrared rays in the first detection area (81). The second pyroelectric sensor (12) serves as a second sensor to detect changes in infrared rays in the second detection area (82).

According to this aspect, it is possible to detect the withdrawal of the human body from the first detection area (81) in the human detection using the first focal electrical sensor (11) and the second focal electrical sensor (12).

The program of the 16th aspect functions as the determination unit (320) in the person detection system (1) of any one of the first to 15th aspects.

According to this aspect, 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) can be detected. In other words, the movement of the human body between two different detection areas can be detected.

1: People detection system

10: Pyroelectric sensor

11: The first focal electric sensor (the first sensor)

12(12a~12d): The second focal electric sensor (the second sensor)

30: Detection device

40: lighting control system

41: lighting fixtures

42: control device

101: Light-receiving element

102: Conversion circuit

103: Amplifying circuit

104: A/D converter

301: Buffer for Pyroelectricity

302: Filter section for pyroelectric power

303: Memory Department

304: Control Department

305: output section

310: Detection Department

311: Indication section (load control section)

320: Judgment Department

321: Change Department

Claims (16)

A human detection system including a determination unit that receives a first sensor for detecting a human body in a first detection area, and a second sensor for detecting the human body in a second detection area And the second detection area includes at least a part of the surrounding area of the first detection area, the second detection area does not overlap with the first detection area, and the determination unit: uses at least the first detection area The output value of the device determines the presence of the human body in the first detection area, and at least the output value of the second sensor is used to determine the exit of the human body from the first detection area. For example, the human detection system of claim 1, wherein the determination unit: uses at least the output value of the first sensor and the first threshold to determine the stay of the human body in the first detection area, and uses at least the second sensor The output value of the detector and the second threshold greater than the first threshold determine the exit of the human body from the first detection area. For example, the person detection system of claim 2, wherein the determination unit, when the output value of the first sensor exceeds the first threshold, It is determined that the human body is present in the first detection area. Such as the person detection system of claim 2, wherein the determination unit determines 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 This is because the human body exists in the first detection area. For example, the human detection system according to any one of claims 2 to 4, which further includes a change unit that performs the output of the first sensor when the human body enters the first detection area according to the determination unit Value, change the above-mentioned first threshold. For example, in the person detection system of claim 5, when the change unit performs the entry detection by the judgment unit, if the output value of the first sensor exceeds the first threshold value and is lower than the first threshold value For the third threshold value, the value greater than the maximum output value of the output value of the first sensor within the first time after the output value of the first sensor exceeds the first threshold value is taken as the first For the threshold value, if the output value of the first sensor is lower than the first threshold value within the second time period, the first threshold value is reduced. Such as the person detection system of claim 6, where The determination unit detects the human body in the first detection area using a plurality of sensitivities including a plurality of thresholds including the first threshold and the third threshold, and compares the length of the determination time that is different from each other to the plurality of sensitivities. Threshold values are associated with each other. After the detection of the entry of the human body into the first detection area, the output value of the first sensor does not exceed the determination time corresponding to one of the plurality of thresholds. In the case of one threshold, the determination unit determines that the human body does not exist in the first detection area. The human detection system according to any one of claims 1 to 4, wherein the determination unit further determines whether the human body enters the first detection area based on the output value of the first sensor. Such as the human detection system of claim 8, wherein when the determination unit detects the entry of the human body into the first detection area, it is determined based on the output value of the second sensor that the human body is present in the second detection area. Initially, it is determined whether the human body has entered the first detection area based on the output value of the first sensor during the period until the entry determination time has elapsed. Such as the human detection system of any one of claims 1 to 4, wherein when the determination unit determines that the human body is present in the first detection area, if it is determined based on the output value of the second sensor to be in the above If the human body exists in the second detection area, it is determined that the human body has exited from the first detection area. For example, the human detection system of claim 10, wherein when it is determined based on the output value of the first sensor that the period until the human body determination time exists in the first detection area and the exit determination time elapses, it is based on the first 2 When the output value of the sensor determines that the human body is present in the second detection area, the determination unit determines that the human body has exited from the first detection area. For example, the person detection system of any one of claims 1 to 4, wherein there are a plurality of the second sensors, and the first detection area is detected by the plurality of second sensors among the plurality of second sensors Surrounded by areas formed by the merger of areas. For example, the person detection system of any one of claims 1 to 4 further includes a load control unit that controls the load based on the determination result of the determination unit. For example, the person detection system of claim 13, wherein the load is a lighting appliance, and when the load control unit detects the presence of the human body in the first detection area, it controls the lighting appliance in such a way that the lighting appliance lights up, and when it detects When the human body does not exist in the first detection area, the lighting fixture is controlled so that the lighting fixture is turned off. According to the person detection system of any one of claims 1 to 4, further comprising: a first focal electrical sensor, which serves as the first sensor to detect changes in infrared rays in the first detection area; and A second pyroelectric sensor is used as the second sensor to detect changes in infrared rays in the second detection area. A computer program product used to make a computer function as the above-mentioned determination unit in the person detection system of any one of claims 1-15.

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