TWI727415B - Human detection system and program - Google Patents

Abstract

The present invention provides a human detection system and program which can reduce the possibility of false detection during micro-motion detection. The human detection system (1) includes a determination unit (320) and a change unit (321). The determination unit (320) performs detection of staying of the human body in the detection area and detection of the entry of the human body into the detection area based on the signal from the thermal sensor (10) used for detecting the human body in the detection area. The changing unit (321) changes the stay detection threshold used for stay detection in accordance with the output value of the thermal electrical sensor (10) when the determination unit (320) performs entry detection into the detection area.

Description

Human detection system and program

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 whether there is a person in the detection area.

Previously, there has been known a system for detecting whether a human body is present in the detection 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 intensity of the infrared light received from the detection space. The multiplication unit multiplies the output signals output from each light receiving unit. The integration part performs integration processing on the multiplication result of the multiplication part. 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.

The environment of the detection space (detection area) changes according to temperature, illuminance, wind, etc. Therefore, the output signal output by the light receiving unit includes noise generated by the change of the environment of the detection space. In this case, the infrared detection system (person detection system) will multiply and integrate the output signal containing noise, and based on the result, determine whether there is a person in the detection space (stay detection), therefore, an error occurs. The possibility of detection is higher.

The present invention has been completed in view of the above-mentioned problems, and its object is to provide a human detection system and program that can reduce the possibility of false detection during stay detection.

The person detection system of one aspect of the present invention includes a determination unit and a change unit. The determination unit receives a signal from a sensor used to detect a human body in the detection area, and based on the received signal, performs detection of the stay of the human body in the detection area and the entry of the human body into the detection area Detection. The changing unit changes the stay detection threshold used in the stay detection based on the output value of the sensor when the determination unit detects the entry into the detection area.

The program of one aspect of the present invention is a program for making the computer function as the above-mentioned human detection system.

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 in addition to the present embodiment and modified examples, various changes can be made according to the design and the like as long as it does not deviate from the scope of the technical idea of the present invention.

(Implementation form) Hereinafter, the person detection system 1 of this embodiment will be described using FIGS. 1 to 4.

(1) Summary The human detection system 1 detects the presence or absence of a human 91 (human body) in a detection area 90 (refer to FIG. 2) set in a corridor of a building, an office, a living room of a house, etc., for example. The human detection system 1 detects the presence or absence of the human 91 based on the change in the received light intensity of the infrared rays from the detection area 90. That is, the human detection system 1 changes the intensity of infrared light received by the movement of the person 91 between the detection area 90 and the detection area 90, or the micro-movement or large-scale movement of the person 91 in the detection area 90, Detect the presence or absence of people 91. The so-called "micromotion" here, for example, refers to the relatively small activities of the person 91, such as the shaking and turning of the body caused by the breathing action of the person 91. Furthermore, in the present embodiment, the detection of the presence or absence of the person 91 in the detection area 90 based on the change in the received light intensity of infrared rays caused by the micro-movement of the person 91 in the detection area 90 is called stay detection. The detection of the presence or absence of the person 91 based on the change in the received light intensity of the infrared rays generated by the movement of the person 91 between the outside of the detection area 90 and the inside of the detection area 90 is called entry detection.

The human detection system 1 detects whether the state of the detection area 90 is an existing state or a non-existent state. The “state of presence” here refers to the state where the person 91 exists in the detection area 90. The so-called "non-existent state" refers to a state in which there is no person 91 in the detection area 90. Therefore, in the state where there is no human 91 in the detection area 90, the detection result of the human detection system 1 becomes the "non-existent state". If the person 91 enters the detection area 90, the detection result of the person detection system 1 changes from the "non-existent state" to the "existent state". Thereafter, while the person 91 stays in the detection area 90, the detection result of the person detection system 1 maintains the "existence state". If the person 91 exits from the detection area 90, that is, it becomes that the person 91 is not in the detection area 90, the detection result of the person detection system 1 changes from the "existence state" to the "nonexistence state".

The human detection system 1 has a plurality of (here, five) thermoelectric sensors 10 (refer to FIG. 1). The human detection system 1 changes the sensitivity of the person who uses the thermal inductance sensor 10 according to the output value of the signal of the thermal inductance sensor 10 for each of the plurality of thermal inductance sensors 10.

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 detection area 90, and a control device 42 (see FIG. 1) that controls the lighting fixture 41. The human detection system 1 determines whether the lighting fixture 41 needs to be lit 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 based on 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 circuit to the lighting fixture 41 and turns the energization of the lighting fixture 41 on/off. In this way, the person detection system 1 of the present embodiment is used for the lighting control system 40 that controls the lighting fixture 41 based on the presence or absence of the person 91 in the detection area 90. Thereby, when the person 91 enters the detection area 90, the person detection system 1 can make the lighting fixture 41 light up. In addition, the person detection system 1 turns off the lighting fixture 41 when the person 91 exits from the detection area 90, thereby suppressing wasted power consumption caused by forgetting to turn off the lighting fixture 41.

(2) Composition As shown in FIG. 1, the human detection system 1 includes a plurality of (here, five) thermoelectric sensors 10 and a detection device 30.

Each thermal sensor 10 has a light receiving element 101, a conversion circuit 102, an amplifier circuit 103, and an A/D converter 104. The light-receiving element 101 is a pyroelectric element, and outputs a signal (electrical signal) corresponding to the change in the intensity of the infrared light received from the detection area 90. 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. The human detection system 1 uses a plurality of thermoelectric sensors 10 to detect the presence or absence of a human 91 in the detection area 90.

Each thermal 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 thereof, and collects infrared light from the detection area 90 on the light receiving element 101. Each thermal sensor 10 is housed in one case together with the detection device 30. In this embodiment, five thermal electrical sensors 10 (10a to 10e) are housed in such a way that the thermal electrical sensors 10a are set as the center and the remaining (4) thermal electrical sensors 10b to 10e are arranged around it. 1 shell. The thermoelectric sensors 10a-10e can detect mutually different ranges in the detection area 90, or at least a part of them overlaps. In short, in a plurality of thermoelectric sensors 10, it is only necessary to set the detection area 90 as the detection range. The person detection system 1 including the thermal sensor 10 is installed on the ceiling of a facility as shown in FIG. 2, and receives infrared rays from a detection area 90 set in the facility.

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

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 is composed of, for example, a microcomputer with a processor and a memory. Furthermore, the processor executes the program stored in the memory, and the microcomputer functions as the control unit 304. The program executed by the processor is pre-recorded in the memory of the microcomputer, but it can be provided by recording on a non-temporary recording medium such as a memory card, or provided through electrical communication 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 thermoelectric buffer 301, and the thermoelectric filter unit 302. Specifically, a plurality of thermoelectric sensors 10 have light receiving elements 101, and output signals V1, V2, V3, V4, and V5 corresponding to changes in the intensity of the infrared rays received from the detection area 90 to the following detection unit 310 (Refer to Figure 1). Signals V1 to V5 are input and output to the detection unit 310, respectively. Furthermore, there are cases where the output signals V1, V2, V3, V4, and V5 are collectively referred to as the output signal V.

The pyroelectric filter unit 302 extracts the AC component from the output of the thermal electrometer 10. The frequency band through which the pyroelectric filter unit 302 passes 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 to V5, respectively become AC signals from which low-frequency components (including DC components) have been removed.

Here, the pyroelectric filter unit 302 that receives the output from each thermal sensor 10 may pass through different frequency bands (passing frequency bands) 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, the pass frequency band of the pyroelectric filter unit 302 is set to, for example, 0.3 Hz to 1 Hz as described above with respect to the output signals V1 to V5 output from the thermal inductance sensors 10. On the other hand, in the case of entry detection, the pass band of the pyroelectric filter unit 302 for the output signals V1 to V5 output from the thermal electrical sensors 10 is, for example, a frequency band with a center frequency of about 1 Hz. In this embodiment, the thermal inductance detector 10a outputs the output signal V1, the thermal inductance detector 10b outputs the output signal V2, the thermal inductance detector 10c outputs the output signal V3, the thermal inductance detector 10d outputs the output signal V4, and the thermal inductance detector 10d outputs the output signal V4. 10e outputs the output signal V5.

The memory portion 303 has a selection from ROM (Read Only Memory), RAM (Random Access Memory), or EEPROM (Electrically Erasable Programmable Read Only Memory). Body) and other devices.

The storage unit 303 stores, for each thermoelectric sensor 10, a threshold value used in entry detection (entry detection threshold value) and a threshold value used in stay detection (stay detection threshold value). Furthermore, the storage unit 303 stores the minimum value (minimum threshold value) set as the threshold value for stay detection for each thermoelectric sensor 10.

The memory unit 303 stores the threshold value (control threshold value) for forcibly controlling the lighting control system 40 (here, the control is performed by turning off) for each thermal sensor 10. In this embodiment, the control threshold is a value smaller than the entry detection threshold, and is a larger value than the stay detection threshold.

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 length corresponding to the entry detection threshold value. 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. Furthermore, these numerical values are just an example, and the intent is not limited to these numerical values.

The control unit 304 has a detection unit 310 and an instruction unit 311 as shown in FIG. 1.

The detection unit 310 detects whether there is a person 91 in the detection area 90 based on the output value of the output signal V of each thermal sensor 10. In other words, the detection unit 310 determines whether the state of the detection area 90 is the "presence state" in which the person 91 exists in the detection area 90 and the "non-existence state" in which the person 91 does not exist in the detection area 90.

The operation mode of the detection unit 310 (that is, 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 whether the person 91 enters the detection area 90 or not. The stay detection mode is an action mode used to detect whether the person 91 exits from the detection area 90, in other words, it is an action mode used to detect whether the person 91 is (stay) in the area 90 or not. That is, the detection unit 310 performs entry detection in the entry detection mode, and performs stay 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.

In the entry detection mode, the judging unit 320 sets the entry detection threshold stored in the memory unit 303 for each thermal sensor 10 as a judging threshold for judging whether the state of the detection area 90 is an "existing state".

The judging unit 320 judges whether the output value of at least one output signal V among the output signals V1 to V5 exceeds the corresponding entry detection threshold value in the entry detection mode. When determining that the output value of at least one output signal V among the output signals V1 to V5 exceeds the corresponding entry detection threshold, the determination unit 320 determines that it is in a state of existence, that is, determines that the person 91 has entered the detection area 90 . When the determining unit 320 determines that the output value of all output signals V of the output signals V1 to V5 is lower than the corresponding entry detection threshold value, it determines that there is no state, that is, it determines that the person 91 has not entered the detection area 90. Here, the term "a certain value exceeds a certain threshold" includes the concept of a situation where a certain value is greater than a certain threshold and a situation where a certain value is greater than a certain threshold.

When the changing unit 321 enters the detection mode, it changes the memory unit corresponding to the thermal inductance sensor 10 according to the output value of the output signal V of the thermal inductance sensor 10 for each of the plurality of thermal inductance sensors 10 303 memory stay detection threshold.

Specifically, when the changing unit 321 enters the detection mode, it determines whether the output value of the output signal V of the thermal electrical sensor 10 exceeds the value corresponding to the thermal electrical sensor 10 for each of the plurality of thermal electrical sensors 10 The threshold for stay detection is lower than the corresponding threshold for entry detection. When the changing unit 321 determines that the output value of the output signal V of the thermal electrical sensor 10 exceeds the threshold value for stay detection corresponding to the thermal electrical sensor 10 and is lower than the corresponding threshold value for entry detection, it compares with the thermal electrical sensor 10 The detector 10 changes the threshold value for stay detection stored in the storage unit 303 in response. In more detail, the changing unit 321 corresponds to the thermal sensor 10 and changes the stay detection threshold stored in the memory unit 303 to a value larger than the currently set value. Furthermore, the stay detection threshold is a value smaller than the entry detection threshold. Therefore, the changed stay detection threshold is also a value smaller than the entry detection threshold. In more detail, the changing unit 321 extracts the thermoelectric sensor 10 for the first time (for example, 5 seconds) after the output value of the output signal V of the thermoelectric sensor 10 exceeds the threshold for stay detection corresponding to the thermoelectric sensor 10 The output value of the maximum value among the output values of the output signal V of the sensor 10. The changing unit 321 corresponds to the thermal sensor 10 and changes the stay detection threshold stored in the memory unit 303 to a value larger than the extracted maximum value. Here, the term "a certain value is lower than a certain threshold" includes the concept of a case where a certain value is below a certain threshold and a case where a certain value is smaller than a certain threshold.

When the changing unit 321 enters the detection mode, the output value of the output signal V of one of the thermal inductance sensors 10 exceeds the threshold value for determination corresponding to the thermal inductance sensor 10 (for entering the detection mode) In the case of threshold), the stay detection threshold corresponding to the thermal sensor 10 is not changed. In more detail, when entering the detection mode, in the first time since the output value of the output signal V of the thermal inductance sensor 10 exceeds the threshold for stay detection corresponding to the thermal inductance sensor 10, if the output value exceeds and The threshold value for determination (threshold value for entry detection) corresponding to the thermoelectric sensor 10, and the changing unit 321 does not change the threshold value for stay detection corresponding to the thermoelectric sensor 10.

Furthermore, when entering the detection mode, the changing unit 321 determines for each of the plurality of thermal inductance sensors 10 whether the output value of the output signal V from the thermal inductance sensor 10 is always lower than that of the thermal inductance during the second time period. The sensor 10 corresponds to the threshold for stay detection. When the changing unit 321 determines that the output value of the output signal V of the thermal electrical sensor 10 is always lower than the threshold value for stay detection corresponding to the thermal electrical sensor 10 during the second time period, the thermal electrical sensor 10 Corresponding to the device 10, the threshold value for stay detection stored in the storage unit 303 is changed. In more detail, the changing unit 321 corresponds to the thermal sensor 10 and changes the stay detection threshold stored in the memory 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 judging unit 320 judges that the presence state, that is, when the person 91 has entered the detection area 90, sets the threshold for stay detection stored in the memory unit 303 for each of the plurality of thermoelectric sensors 10 as judgment Use threshold. At this time, the determination unit 320 changes the operation mode from the entry detection mode to the stay detection mode, and starts the stay detection.

When the judging unit 320 is in the stay detection mode, for each of the plurality of thermal electrical sensors 10, the output signal of the thermal electrical sensor 10 is determined during the non-existence judging time for detecting the presence or absence of the person 91 in the detection area 90 Whether the output value of V is always lower than the threshold value for stay detection corresponding to the thermal sensor 10. During the absence of the determination time, if the output value of all the output signals V of the plurality of thermal electrical sensors 10 is always lower than the stay detection threshold corresponding to each thermal electrical sensor 10, the determination unit 320 determines that The person 91 is not in the detection area 90, that is, it is determined to be in a non-existent state. When determining that the person 91 is not in the detection area 90, the determination unit 320 sets the corresponding entry detection threshold as the determination threshold for each of the plurality of thermoelectric sensors 10. At this time, the determination unit 320 changes the operation mode self-stay detection mode to the entry detection mode, and starts the entry detection. Here, the non-existence determination time is, for example, 1 minute.

In more detail, when the determination unit 320 is in the stay detection mode, for each of the plurality of thermal electrical sensors 10, if the output value of the output signal V of the thermal electrical sensor 10 is lower than the corresponding stay of the thermal electrical sensor 10 The detection threshold value starts the time counting of the first long judgment time stored in the storage unit 303 as the non-existence judgment time. For example, the determination unit 320 uses the first timer to count the first determination time period. During the period from the beginning of time counting with the first timer to the time when there is no judging time, if the output value of all the output signals V of the plurality of thermal inductance sensors 10 is always lower than the stay corresponding to each thermal inductance sensor 10 With the detection threshold, the determination unit 320 determines that the person 91 is not in the detection area 90, that is, determines that it is not present. The judging unit 320 is the output value of the output signal V of one of the plurality of thermoelectric sensors 10 during the period from the start of the time counting by the first timer to the elapse of the non-existence judging time When the threshold value for stay detection corresponding to the thermal sensor 10 is exceeded, it is determined that the person 91 is present in the detection area 90, that is, it is determined that the presence state is present. At this time, the judging unit 320 resets the time counting of each of the plurality of thermoelectric sensors 10 performed by the first timer, and starts the time counting of each of the plurality of thermoelectric sensors 10 with the first timer again. With this, the stay detection mode continues. Furthermore, the count of the non-existent judgment time can be counted up from the value "0" to the first judgment time long (the long time of the no judgment time), or it can be counted down from the first judgment time long to the value "0".

In the stay detection mode, the judging unit 320 judges whether the output value of the output signal V of the thermal electrical sensor 10 is constant during the long period of the second judgment time stored in the memory unit 303 for each of the plurality of thermal electrical sensors 10 It is lower than the control threshold value corresponding to the thermal sensor 10. When the output value of all the output signals V of the plurality of thermal electrical sensors 10 is always lower than the control threshold value corresponding to each thermal electrical sensor 10 during the long second judgment time period, the judging unit 320 judges that it is a person 91 Not in detection area 90. When the determination unit 320 determines that the person 91 is not in the detection area 90, that is, when it is determined to be in a non-existent state, the corresponding entry detection threshold value is set as the determination threshold value for each of the plurality of thermoelectric sensors 10 . 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, when the determination unit 320 is in the stay detection mode, for each of the plurality of thermal electrical sensors 10, if the output value of the output signal V of the thermal electrical sensor 10 is lower than that corresponding to the thermal electrical sensor 10 The threshold for control starts to count the time until the second judgment time is long. For example, the determination unit 320 uses a second timer to count the second determination time period. During the period from the start of the time counting by the second timer to the long second determination time, the judging unit 320 has output values of all the output signals V of the plurality of thermal inductance sensors 10 always lower than those of the thermal inductances. In the case of the control threshold corresponding to the detector 10, it is determined that the person 91 is not in the detection area 90, that is, it is determined to be in a non-existent state. The judging unit 320 is the output value of the output signal V of one of the plurality of thermoelectric sensors 10 during the period from the time when the second timer is started to the second judging time is long When the control threshold corresponding to the thermal electrical sensor 10 is exceeded, the time counting of each of the thermal electrical sensors 10 by the second timer is reset. After that, the judging unit 320 starts to count the time by the second timer again for each of the plurality of thermoelectric sensors 10. Furthermore, the time until the second judgment time is long can be counted up from the value "0" to the second judgment time, or it can be counted down from the second judgment time to the value "0". The judging unit 320 compares the output value with the control threshold until the second judging time is long, and thereby can detect an activity larger than the activity of the person 91 detected using the stay detection threshold.

In the stay detection mode, the determining unit 320 determines whether the output value of the output signal V of the thermal electrical sensor 10 is always low during the long period of the third determination time stored in the memory unit 303 for each of the plurality of thermal electrical sensors 10 This corresponds to the entry detection threshold value corresponding to the thermal sensor 10. The judging unit 320 judges that it is a human when the output value of all the output signals V of the plurality of thermoelectric sensors 10 is always lower than the entry detection threshold value corresponding to each thermoelectric sensor 10 during the third long judging time period. 91 is not in the detection area 90, that is, it is determined to be a non-existent state. When determining that the person 91 is not in the detection area 90, the determination unit 320 sets the corresponding entry detection threshold for each of the plurality of thermal electrical sensors 10 as the determination threshold. 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, when the determination unit 320 is in the stay detection mode, for each of the plurality of thermal electrical sensors 10, if the output value of the output signal V of the thermal electrical sensor 10 is lower than that corresponding to the thermal electrical sensor 10 When the threshold value for detection is entered, the counting of the time until the third judgment time is long is started. For example, the determination unit 320 uses a third timer to count the third determination time period. During the period from the start of the time counting by the third timer to the long time of the third determination by the determining unit 320, the output value of all the output signals V of the plurality of thermal inductance detectors 10 is always lower than that of the thermal inductances. When the detector 10 corresponds to the entry detection threshold, it is determined that the person 91 is not in the detection area 90, that is, it is determined to be a non-existent state. In the judging unit 320, the output value of the output signal V of the thermal inductance sensor 10 exceeds that corresponding to the thermal inductance sensor 10 during the period from the start of the time counting by the third timer to the third judgment time period. When the threshold value for detection is entered, the time counting of each of the plurality of thermoelectric sensors 10 performed by the third timer is reset. After that, the determination unit 320 starts to count the time by the third timer again for each of the plurality of thermoelectric sensors 10. Furthermore, the time counting up to the third judgment time length 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 length to the value "0". The judging unit 320 compares the output value with the entry detection threshold until the third judgment time is long, and thereby can detect a larger activity than the activity of the person 91 detected using the control threshold detection.

In short, the determination unit 320 uses the output value of the output signal V of the thermal electrical sensor 10, and the threshold value for stay detection and the threshold value for control corresponding to the thermal electrical sensor 10 for each of the plurality of thermal electrical sensors 10 And the threshold for entry detection, human detection is performed with a plurality of (three in this embodiment) sensitivities.

The judging unit 320 performs a check on one of the thermoelectric sensors 10, and if the output value of the output signal V of the thermoelectric sensor 10 exceeds the threshold value for stay detection corresponding to the thermoelectric sensor 10, If any one of the threshold value for control and the threshold value for entry detection is used, the long determination time timer corresponding to the threshold value is reset. At this time, the determination unit 320 also resets the determination time corresponding to the second threshold value that is smaller than the first threshold value as the threshold value to be longer. For example, when the output value of the output signal V of the thermal electrical sensor 10 exceeds the entry detection threshold within the third determination time period, the determination unit 320 resets the timing of the third determination time period. At this time, the output value of the output signal V of the thermal sensor 10 exceeds both the stay detection threshold and the control threshold. Therefore, the determination unit 320 also resets the corresponding one of the stay detection threshold and the control threshold. Time counting of the long time of the first judgment and the long time of the second judgment.

If the judging unit 320 counts the elapse of any one of the longest judgment time of the first judgment time, the second judgment time, and the third judgment time corresponding to each of the stay detection threshold, the control threshold, and the entry detection threshold. , It is determined that the person 91 is not in the detection area 90, that is, it is determined that it does not exist. In other words, the output value of all the output signals V of the judging unit 320 on the plurality of thermal electrical sensors 10 corresponds to one of the threshold value for stay detection, the threshold value for control, and the threshold value for entry detection corresponding to each thermal electrical sensor 10 When the corresponding determination time does not exceed the threshold value, it is determined that the person 91 is not in the detection area 90.

For example, if the output value of the output signal V of the thermal sensor 10 exceeds the threshold for stay detection during the first long period of determination time (absence determination time), the determination unit 320 determines that the person 91 has not exited from the detection area 90 , That is, it is determined to be in the existing state, and the detection mode is continued. At this time, noise may be included in the output signal V of the thermal sensor 10 due to environmental influences such as temperature, illuminance, and wind in the detection area 90. Therefore, even if the person 91 is not in the detection area 90 by the determination unit 320, the output value of the output signal V may exceed the stay detection threshold during the first determination time period. That is, the output signal V of the thermoelectric sensor 10 contains noise due to the influence of the environment in the detection area 90, and as a result, the determination unit 320 may perform an erroneous detection of the presence of the person 91 in the detection area 90.

In addition, the person 91 performs activities more than the person 91 detected by using the stay detection threshold during the period of the second long judgment time (10 minutes here) and the long period of the third judgment time (15 minutes here) The possibility of larger activities is higher. Therefore, in this embodiment, in the stay detection mode, the determination unit 320 uses the stay detection threshold to detect the stay of the person 91 in the detection area 90, and within a certain period of time (the second long period of determination time, the third During the long determination time period), other thresholds (threshold for control, threshold for entry detection) are used to detect the stay of the person 91 in the detection area 90. The judging unit 320 judges that it is the detection area when no activity larger than the activity of the person 91 detected using the stay detection threshold is not detected during the long second judgment time or the long third judgment time period 90 is non-existent state.

Thereby, even when the stay detection threshold is used to detect the stay of the person 91, the determination unit 320 detects whether there is a greater value within a specific time (within the second determination time period or the third determination time period) This activity can eliminate the above-mentioned false detections.

After the determination unit 320 changes the operation mode from the stay detection mode to the detection mode, the output value of the output signal V of at least one of the plurality of thermal inductance sensors 10 exceeds the corresponding In the case of the entry detection threshold, the operation mode is changed from the entry detection mode to the stay detection mode, and the stay detection starts. At this time, the determination unit 320 sets the corresponding minimum threshold value as the threshold value for stay detection as the threshold value for determination for each of the plurality of thermoelectric sensors 10. Here, the third time is, for example, 10 seconds.

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

(3) Action Next, referring to FIG. 3, the operation of the person detection system 1 of the present embodiment, particularly the setting change of the threshold value for stay detection will be described. Here, the output signal V1 from the thermal sensor 10a is used for description.

In FIG. 3, the state change in the detection area 90 along the time axis, and the detection result of the thermal sensor 10a in the detection area 90, that is, the change in the output value of the output signal V1, are shown. In addition, here, for the thermoelectric sensor 10a, the value "a" is set as the threshold value Th1 for entry detection, and the value "b" is set as the initial value of the threshold value Th2 for stay detection. Furthermore, the value "b" is a value smaller than the value "a". In FIG. 3, the period of entering the detection threshold Th1 (the period before time t7 and the period after time t15) is represented by a solid line in FIG. 3, and the period during which the human detection system 1 operates in the detection mode is represented by a solid line. The period of the threshold Th2 (the period from time t7 to t15) represents the period during which the human detection system 1 operates in the stay detection mode. In addition, the threshold value for determination of each of the plurality of thermal electrical sensors 10 is set with the threshold value for entry detection corresponding to the thermal electrical sensors. For example, the threshold value for determination corresponding to the thermoelectric sensor 10a is set with the value "a" as the threshold value Th1 for entry detection.

When the changing unit 321 enters the detection mode, it determines whether the output value of the output signal V of the thermal electrical sensor 10 exceeds the threshold value for stay detection corresponding to the thermal electrical sensor 10 for each of the plurality of thermal electrical sensors 10, and Below the corresponding threshold for entry detection.

At time t1, the output value of the output signal V1 of the thermal sensor 10a exceeds the value "b" and is lower than the value "a". The changing unit 321 corresponds to the thermal sensor 10a and changes the stay detection threshold Th2 stored in the memory unit 303 to the output value of the output signal V1 during the period t1 to t2, which is the first time (5 seconds). As the maximum output value, the larger value "c" (time t2). Thereby, the value "b" as the stay detection threshold Th2 corresponding to the thermal electrical sensor 10a stored in the memory unit 303 is changed to the value "c". Furthermore, the stay detection threshold is a value smaller than the entry detection threshold. Therefore, the value "c" as the changed stay detection threshold Th2 is also smaller than the value "a" as the entry detection threshold Th1 The value.

At time t3, the output value of the output signal V1 of the thermal sensor 10a exceeds the value "c" and is lower than the value "a". The changing unit 321 corresponds to the thermal sensor 10a, and changes the stay detection threshold Th2 stored in the memory unit 303 to the output value of the output signal V1 during the period t3 to t4, which is the first time (5 seconds) The maximum output value is "d" (time t4). Thereby, the value "c" which is the stay detection threshold Th2 corresponding to the thermoelectric sensor 10a stored in the memory unit 303 is changed to the value "d". Furthermore, the stay detection threshold is a value smaller than the entry detection threshold. Therefore, the value "d" as the changed stay detection threshold Th2 is also smaller than the value "a" as the entry detection threshold Th1 The value.

When the changing unit 321 enters the detection mode, during the second time period, it determines whether the output value of the output signal V from the thermal electrical sensor 10 is always lower than that of the thermal electrical sensor 10a during the second time period. 10 corresponds to the threshold for stay detection.

In FIG. 3, during the period P1 representing the second time (the period from time t4 to t5), the output value of the output signal V1 of the thermal electrical sensor 10a is always lower than the threshold value for stay detection corresponding to the thermal electrical sensor 10a The value of Th2 "d". The change part 321 corresponds to the thermal sensor 10a, and changes the stay detection threshold Th2 stored in the memory part 303 to a value smaller than the currently set value "d" and the largest value than the output signal V1 at the second time The larger output value is the value "e". Thereby, the value "d" which is the stay detection threshold Th2 corresponding to the thermoelectric sensor 10a stored in the memory unit 303 is changed to the value "e".

The judging unit 320 judges whether the output value of at least one output signal V among the output signals V1 to V5 of the plurality of thermoelectric sensors 10 exceeds the corresponding entry detection threshold value in the entry detection mode.

At time t6, the person 91 enters the detection area 90, and therefore, the output value of the output signal V1 of the thermoelectric sensor 10a exceeds the value "e" which is the threshold value Th2 for stay detection. Here, the person 91 enters the detection area 90. Therefore, during the period from time t6 until the first time elapses, the output value of the output signal V1 exceeds the entry detection set as the threshold value for determination corresponding to the thermoelectric sensor 10a The threshold Th1, that is, the value "a" (time t7) is used. If the output value of the output signal V1 exceeds the value “a” set as the threshold value for determination, the determination unit 320 determines that the presence state is present, that is, determines that the person 91 has entered the detection area 90. 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. At time t7, the judging unit 320 changes the value set as the judging threshold corresponding to each of the thermoelectric sensors 10 from the entry detection threshold corresponding to each to the current memorized by the memory unit 303 and corresponding to each one. Corresponding to the threshold for stay detection. For example, the judging unit 320 changes the value set as the judging threshold corresponding to the thermal electrical sensor 10a from the value "a" as the entry detection threshold Th1 to the value stored in the current memory unit 303 as the stay detection threshold Th2 "E". Furthermore, the detection unit 310 changes the operation mode from the entry detection mode to the stay detection mode. Furthermore, as described above, when the output value of the output signal V1 of the thermal sensor 10a exceeds the value "a" which is the entry detection threshold Th1 during the period until the first time has elapsed, the changing unit 321 does not perform As a change of the value "e" of the stay detection threshold Th2 corresponding to the thermal electrical sensor 10a.

When the judging unit 320 is in the stay detection mode, it determines whether the output value of the output signal V of the thermal electrical sensor 10 is always lower than that of the thermal electrical sensor 10 during the period of the non-existent judging time. The device 10 corresponds to the threshold for stay detection.

In FIG. 3, at time t9 when the output value of the output signal V1 of the thermal sensor 10a is lower than the value "e" set as the threshold value for determination, at time t9 until the first determination time has elapsed, the output signal V is The output value exceeds the value "e". The determining unit 320 determines that it is in the existing state, resets the timing of the time of each of the plurality of thermoelectric sensors 10, and restarts the timing of the time of each of the plurality of thermoelectric sensors 10. That is, the detection unit 310 continues to stay in the detection mode. At this time, the human detection system 1 outputs a control signal (lighting signal) indicating lighting to the control device 42.

At the time t10 until the first determination time period has elapsed after the time counting is restarted, the output value of the output signal V1 exceeds the value "e". In this case, the judging unit 320 resets the timing of the first judging time length for each of the plurality of thermal electrical sensors 10, and restarts the first judging of each of the multiple thermal electrical sensors 10 The timing of long time. Furthermore, after that, at time t11 until the first determination time has elapsed, the output value of the output signal V1 exceeds the value "e". Therefore, the determination unit 320 resets the first determination for each of the plurality of thermal inductors 10 1 Counting the long-term judgment time, and start again the time counting the first long-term judgment time of each of the plurality of thermoelectric sensors 10. At this time, the human detection system 1 outputs a control signal (lighting signal) indicating lighting to the control device 42.

Thereafter, if the person 91 wants to exit from the detection area 90 at time t12 until the first determination time has elapsed, the output value of the output signal V1 exceeds the value "e" due to the activity of the person 91, and furthermore, at time t13, the output value of the output signal V1 exceeds the value "a". The judging unit 320 resets the timing of the first long judging time for each of the plurality of thermoelectric sensors 10, and starts again the first judging time of each of the plurality of thermoelectric sensors 10 Timing. The judging unit 320 counts the first judging time from the time t14 when the output value of the output signal V1 of the thermal inductance sensor 10a is lower than the value "e". At this time, the human detection system 1 outputs a control signal (lighting signal) indicating lighting to the control device 42.

In FIG. 3, during the period P2 (the period from time t14 to t15) indicating that there is no determination time (the first determination time is long), the output value of the output signal V1 of the thermal inductance detector 10a is always lower than that of the thermal inductance test The value "e" of the threshold for determination corresponding to the device 10a. Furthermore, for other thermal electrometers 10, it is also assumed that the output value of each output signal V (V2 to V5) output during the non-existence determination time is always lower than the determination threshold value corresponding to each.

If the output values of all the output signals V of the plurality of thermal electrical sensors 10 are always lower than the stay detection threshold (judgment threshold) corresponding to each thermal electrical sensor 10 during the non-existence judgment time, the judging unit 320 judges that it is human 91 is not in the detection area 90, that is, it is determined to be 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. At time t15, the judging unit 320 sets a value for each of the plurality of thermal electrical sensors 10 as a threshold for judging corresponding to the thermal electrical sensor 10, from the stay detection corresponding to the thermal electrical sensor 10 The threshold value is changed to the entry detection threshold value corresponding to the thermal sensor 10. For example, the determination unit 320 changes the value set as the determination threshold corresponding to the thermal electrical sensor 10a from the value "e" as the stay detection threshold Th2 to the value "a" as the entry detection threshold Th1. Furthermore, the detection unit 310 changes the operation mode from the self-stay detection mode to the entry detection mode.

At the third time when time t15 is set as the starting point, if the output value of the output signal V of at least one of the plurality of thermoelectric sensors 10 exceeds the corresponding entry detection threshold, the determination unit 320 will The operation mode is changed from the entry detection mode to the stay detection mode. At this time, the determination unit 320 sets the corresponding minimum threshold value as the threshold value for stay detection as the threshold value for determination for each of the plurality of thermoelectric sensors 10. With this, even when the human detection system 1 erroneously turns off the lighting fixture 41, if the human 91 is detected within the third time, the lighting can be turned on again.

Next, using FIG. 4, the case where the output value of the output signal V1 of the thermal sensor 10a exceeds the value "b" and is lower than the value "a" when entering the detection mode will be explained related to the change of the stay detection threshold Th2 action. Here, the case where the value "b" which is the threshold value Th2 for stay detection is changed to the value "c" will be described.

The changing unit 321 detects that the output value of the output signal V1 of the thermal sensor 10a exceeds the value "b" and is lower than the value "a" at the time t1. The changing unit 321 acquires the maximum value "b1" among the output values of the output signal V1 output from the thermal inductance sensor 10a during the period P3 from time t1 to t2 as the first time.

The changing unit 321 corresponds to the thermal sensor 10a at time t2, and changes the value "b" stored in the memory unit 303 as the stay detection threshold Th2 to a value "c" which is larger than the acquired value "b1".

(4) Advantages In this embodiment, the detection device 30 of the human detection system 1 is used in the entry detection mode by setting the entry detection threshold value as the judgment threshold value in order to determine whether or not a person 91 is present in the detection area 90. When the detection device 30 is in the stay detection mode, when determining whether or not a person 91 is present in the detection area 90, the threshold value for stay detection is set as the threshold value for determination and used. In addition, noise is generated due to the environment in the detection area 90, and the output signal V output from the thermal electrical sensor 10 includes the detection result of the noise. Therefore, if the threshold for stay detection is fixed, the output value of the output signal V output from the thermal sensor 10 affected by noise may exceed the threshold for stay detection. In this case, if the detection device 30 uses a fixed threshold for stay detection in the stay detection mode, even if the person 91 does not exist in the detection area 90, it may be erroneously detected that the person 91 exists in the detection area 90.

Therefore, the detection device 30 of this embodiment changes the stay according to the output value of the noise-containing output signal V output from the thermal inductor 10 in the entry detection mode where the stay detection threshold is not used in the detection of the person 91 Threshold for detection. Thereby, the threshold value for stay detection suitable for the environment of the detection area 90 can be set. As a result, the detection device 30 can further improve the accuracy of human detection in the stay detection mode.

In the present embodiment, when the human detection system 1 changes the threshold for stay detection to a larger value when entering the detection mode, it will be compared with the output value of the output signal V from the thermal sensor 10 in the first time period. The larger value is set as the threshold value for stay detection. As a result, in the human detection system 1, when staying in the detection mode, the possibility of erroneously detecting that the human 91 exists in the detection area 90 when the human 91 does not exist in the detection area 90 can be reduced.

In addition, when the human detection system 1 changes the stay detection threshold to a smaller value when entering the detection mode, it is changed to a value smaller than the currently set value and larger than the maximum output value in the second time. Great value. In this way, in the human detection system 1, in the stay detection mode, the stay detection can be performed with better accuracy.

When the human detection system 1 is in the stay detection mode, in the long non-existence determination time of the first determination time, it is determined whether the output value of the output signal V of the thermal electrical sensor 10 is always lower than the stay detection corresponding to the thermal electrical sensor 10 Use threshold. When the human detection system 1 is in the stay detection mode, it is determined whether the output value of the output signal V of the thermal electrical sensor 10 is always lower than the control threshold value corresponding to the thermal electrical sensor 10 during the long period of the second judgment time. Furthermore, when the human detection system 1 is in the stay detection mode, it is determined whether the output value of the output signal V of the thermal electrical sensor 10 is always lower than the entry detection threshold value corresponding to the thermal electrical sensor 10 during the third determination time period.

The human detection system 1 can reduce the possibility of erroneously detecting that the human 91 exists in the detection area 90 when the human 91 does not exist in the detection area 90 by making the determination of these three patterns. As described above, the person 91 is the person who is detected more than the use stay detection threshold during the second long judgment time (here, 10 minutes) and the third long judgment time (here, 15 minutes). 91 events are more likely to be larger events.

Therefore, when the detection unit 310 does not detect an activity greater than the activity of the person 91 detected using the stay detection threshold within the second long period of time or the third long period of time, it is determined as Not in the state of detection area 90. In this way, the human detection system 1 can reduce the possibility of erroneously detecting that the human 91 is present in the detection area 90 when the human 91 is not present in the detection area 90.

(5) Variation example Hereinafter, a modified example will be described. In addition, the modified examples described below can be applied in appropriate combination with the above-mentioned embodiments.

(5-1) Variation example 1 The person detection system 1a of this modified example is different from the person detection system 1 of the above-mentioned embodiment in that it is configured to be able to communicate with other person detection systems 1b.

The human detection system 1a of this modified example will be mainly described with respect to differences from the human detection system 1 of the above-mentioned embodiment. In addition, the same symbols are attached to the same constituent elements, and their descriptions are appropriately omitted.

The human detection system 1b uses an area adjacent to the detection area 90 of the human detection system 1a as a detection area to detect whether a person exists.

As shown in FIG. 5, the person detection system 1a of this modification includes a plurality of (here, five) thermoelectric sensors 10 and a detection device 30a. The detection device 30a includes a communication unit 306 in addition to the constituent elements of the detection device 30 of the embodiment.

In this modified example, the detection device 30a is composed of, for example, a microcomputer with a processor and a memory. Furthermore, the processor executes the program stored in the memory, and the microcomputer functions as the control unit 304. The program executed by the processor is pre-recorded in the memory of the microcomputer here, but it can be recorded on a recording medium such as a memory card and provided, or it can be provided through electrical communication lines such as the Internet.

The communication unit 306 is a communication interface capable of communicating with the other person detection system 1b. The communication unit 306 receives the detection result in the human detection system 1b. Furthermore, the communication unit 306 transmits the detection result of the detection unit 310a to the human detection system 1b.

The control unit 304 of the detection device 30a has a detection unit 310a and an instruction unit 311.

The detection unit 310a has a determination unit 320 and a change unit 321a.

The changing unit 321a has the following functions in addition to the functions of the changing unit 321 of the embodiment.

When the changing unit 321a enters the detection mode, if the output value of the output signal V of a thermal electrical sensor 10 exceeds the threshold for stay detection corresponding to the thermal electrical sensor 10 until the first time elapses, the human detection system 1b If the person 91 is detected, the threshold value for stay detection corresponding to the thermal sensor 10 is not changed. For example, when the changing unit 321a enters the detection mode, if it receives a detection result indicating that it is in the "presence state" from the human detection system 1b via the communication unit 306 within the first time, it will be in a specific time (for example, 10 seconds) During the period of the clock), the threshold value for stay detection is not changed.

Thereby, if the entry of the person 91 is detected in another detection area adjacent to the detection area 90, the possibility of detecting the person 91 in the detection area 90 is higher. Therefore, by knowing in advance that the person 91 is detected by the person detection system 1b, the corresponding stay detection threshold may not be changed.

Moreover, if the entry of the person 91 is detected in another detection area adjacent to the detection area 90, the person detection system 1a may control the lighting fixture 41 so that the lighting fixture 41 of the detection area 90 lights up. In this case, it is possible to prevent the luminaire 41 from emitting heat due to the lighting of the luminaire 41, and the noise caused by the heat causes the threshold value for stay detection to be changed.

(5-2) Variation 2

In the above-mentioned embodiment, the human detection system 1 has a configuration in which the entry detection threshold, the stay detection threshold, the control threshold, and the minimum threshold are set for each thermoelectric sensor 10. However, it is not limited to this structure. It is also possible to set one threshold for entry detection, one threshold for stay detection, one threshold for control, and one minimum threshold for a plurality of thermoelectric sensors 10.

In this case, when the changing unit 321 enters the detection mode, when the output value of the output signal V of at least one of the plurality of thermoelectric sensors 10 exceeds the threshold for stay detection, it changes the number of One threshold value for stay detection set by each thermal conductivity sensor 10. Specifically, the changing unit 321 changes the one stay detection threshold set for the plurality of thermoelectric sensors 10 to a value larger than the currently set value and smaller than the entry detection threshold.

In addition, when the changing unit 321 enters the detection mode, when the output values of all the output signals V of the plurality of thermal inductance sensors 10 are always lower than the threshold for stay detection during the second time period, it changes to the plurality of thermal inductances. A threshold for stay detection set by the detector 10. Specifically, the changing unit 321 changes a threshold value for stay detection set for a plurality of thermoelectric sensors 10 to a value smaller than the currently set value and larger than the maximum output value in the second time. .

(5-3) Variation 3 In the above embodiment, the judging unit 320 is configured such that the output value of the output signal V of at least one thermal sensor 10 exceeds the value within the third time after the automatic operation mode is changed from the stay detection mode to the detection mode. When entering the detection threshold value, the minimum threshold value is set as the stay detection threshold value as the judgment threshold value. However, it is not limited to this structure.

The judging unit 320 can also set a higher value than the current one when the output value of the output signal V of at least one thermal sensor 10 exceeds the threshold for entering the detection within the third time since the automatic operation mode is changed from the stay detection mode to the detection mode. Set the lower threshold for stay detection.

(5-4) Variation 4 In the above-mentioned embodiment, the load controlled based on the detection result of the presence or absence of a person in the detection area 90 is set as the lighting appliance 41, but the controlled load may also be an air conditioner.

In this case, the human detection system 1 sets the air conditioner to the on state when it detects the "existence state" and sets the air conditioner to the off state when it detects the "non-existent state". , Control the air-conditioning machine.

(5-5) Variation example 5 In the above-described embodiment, the human detection system 1 is configured to include a plurality of thermal electrical 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 thermoelectric sensors 10, that is, a configuration that only includes the detection device 30.

(5-6) Variation 6 In the above-mentioned embodiment, the human detection system 1 is configured to include the thermoelectric sensor 10 as a sensor for human detection, but it is not limited to this configuration. The human detection system 1 can also be equipped with a thermal image sensor as a sensor for human detection.

In addition, in the above-described embodiment, the human detection system 1 is configured to include a plurality of thermal sensors 10, but it is not limited to this configuration. The human detection system 1 may also have a thermal conductivity sensor 10. In short, the human detection system 1 has at least one thermal sensor 10.

In addition, the determination unit 320 is configured to use entry detection thresholds, control thresholds, and stay detection thresholds in the case of human detection using three sensitivities as a plurality of sensitivities in the stay mode. 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 in the case of human detection with 3 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, the determination unit 320 may use three threshold values that are different from the entry detection threshold, the control threshold, and the stay detection threshold when performing human detection with three sensitivities in the stay mode.

In addition, when the determination unit 320 is in the stay mode, when detecting a person with two sensitivities as a plurality of sensitivities, two thresholds among the entry detection threshold, the control threshold, and the stay detection threshold may also be used. Alternatively, the determination unit 320 may use one of the entry detection threshold, the control threshold, and the stay detection threshold, and the entry detection threshold in the case of human detection with two sensitivities in the stay mode. , The threshold value for control and the threshold value for stay detection are different. Alternatively, the determination unit 320 may use two thresholds 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, in the case where human detection is performed by the determination unit 320 with four or more sensitivities as a plurality of sensitivities, the four 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 value based on the signal of the thermoelectric 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 thermal 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 human detection system 1 can also be realized by a human detection method, a computer program, or a recording medium on which the program is recorded. One aspect of the person detection method of the person detection system 1 includes a determination step and a modification step. The determination step receives the signal (output signal V) from the sensor (thermoelectric sensor 10) for detecting the human body (person 91) in the detection area 90, and detects the human body in the area 90 based on the received signal The stay detection and the detection of the human body entering the detection area 90. The changing step changes the stay detection threshold value for stay detection based on the output value of the sensor when the entry detection to the detection area 90 is performed in the determination step. 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 sets the processor and memory as the hardware as the main component. 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 electrical communication lines, and can also be recorded on non-temporary recording media such as memory cards, optical discs, and hard disk drives that can be read by the computer system. The processor of a computer system is composed of one or more electronic circuits including semiconductor integrated circuits (IC) or large-scale integrated circuits (LSI). Integrated circuits such as IC or LSI are referred to here according to the degree of integration, including system LSI, VLSI (Very Large Scale Integration), or ULSI (Ultra Large Scale Integration). Integrated circuit) of the integrated circuit. Furthermore, for logic devices that can be programmed after the LSI is manufactured, FPGA (Field-Programmable Gate Array), or reconfiguration of the bonding relationship within the LSI, or reconfiguration of the circuit division within the LSI, it is also Can be used as a processor. 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 referred to here includes a microcontroller with more than one processor and more than one memory. Therefore, the microcontroller is also composed of one or more electronic circuits including semiconductor integrated circuits or large-scale integrated circuits.

In addition, the integration of multiple functions in the human detection system 1 in one housing is not an essential configuration for the human detection system 1, and the constituent elements of the human detection system 1 may also be distributed in multiple housings. Furthermore, at least a part of the functions of the human detection system 1, such as part of the functions of the detection device 30, can also be implemented 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. 6. 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 is provided with a plurality of thermoelectric sensors 10 similarly to the above-mentioned embodiment. The human detection device 500 further includes an acquiring unit that acquires information corresponding to the output signals V of the plurality of thermoelectric 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 control information (extinguishing information) indicating 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 to the control device 42 as a control signal. 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 a control signal to the control device 42.

In addition, when the server 501 enters the detection mode, based on the information corresponding to the output signal V of each thermal electrical sensor 10 received from the human detection device 500, the threshold value for stay detection corresponding to each thermal electrical sensor 10 is changed.

In this way, the human detection device 500 can control the lighting equipment 41 to turn on and off by cooperating with the server 501. Furthermore, the server 501 cooperates with the human detection device 500 to change the stay detection threshold corresponding to each thermal sensor 10 when entering the detection mode. The person detection system 1 shown in FIG. 6 is more effective when, for example, the information in the facility (information from the thermal sensor 10) is used to provide a service for controlling the lighting equipment in the facility.

(to sum up) As described above, the person detection system (1, 1a) of the first aspect includes a determination unit (320) and a change unit (321). The judging unit (320) receives the signal (output signal V) from the sensor (thermistor sensor 10) used to detect the human body (person 91) in the detection area (90), and performs a process based on the received signal The detection of the stay of the human body in the detection area (90) and the detection of the entry of the human body into the detection area (90). The changing unit (321) changes the stay detection threshold value used for stay detection according to the output value of the sensor when the determination unit (320) performs entry detection to the detection area (90).

According to this structure, in the case of entering detection, the threshold value for stay detection is changed according to the output value of the signal, and therefore, the accuracy of stay detection can be improved. Thereby, the human detection system (1, 1a) can reduce the possibility of false detection during stay detection.

According to the environment of the detection area (90), the signal from the sensor contains noise. At this time, the output value of the signal 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 detection area (90), it may be erroneously detected as the presence of a human body in the detection area (90). Therefore, in the case of entering the detection area (90), by changing the threshold value for stay detection according to the output value of the signal, the possibility of the above-mentioned false detection can be reduced.

In the second aspect of the human detection system (1, 1a), as in the first aspect, the determination unit (320) uses the entry detection as a value larger than the stay detection threshold when performing entry detection Use threshold. The changing unit (321) does not change the threshold for entry detection, but changes the threshold for stay detection.

According to this structure, the threshold for intrusion detection is not changed, and therefore, it does not affect the sensitivity (accuracy) of the intrusion detection.

In the third aspect of the person detection system (1, 1a), as in the second aspect, the determination unit (320) uses the stay detection threshold when performing stay detection. The determination unit (320) determines that the human body does not exist in the detection area (90) when the output value continues to fall below the threshold value for stay detection during the absence determination time.

According to this structure, the threshold value used is changed according to the entry detection and the stay detection, and therefore, an appropriate threshold value corresponding to the detection situation can be set.

In the fourth aspect of the person detection system (1, 1a), as in the third aspect, when the change part (321) performs the entry detection in the determination part (320), if the output value exceeds the stay detection threshold and If the threshold is lower than the entry detection threshold, the maximum output value of the sensor output during the first time period after the output value exceeds the stay detection threshold is set as the stay detection threshold. The changing unit (321) decreases the stay detection threshold when the output value is lower than the stay detection threshold during the second time when the determination unit (320) performs entry detection.

According to this configuration, the threshold value for stay detection can be appropriately set in accordance with the output value.

In the fifth aspect of the person detection system (1, 1a), as in the fourth aspect, the change section (321) in the case of the determination section (320) performing entry detection, the output value exceeds the entry at the first time In the case of the detection threshold, the stay detection threshold will not be changed.

According to this configuration, it is possible to prevent excessive changes to the threshold for stay detection when a human body enters the detection area (90).

In the sixth aspect of the person detection system (1a), such as the fourth or fifth aspect, if the change part (321) is in the judgment part (320) to perform the entry detection, it will be from another person at the first time The detection system (1b) receives the signal of the intention of detecting the human body, and does not change the threshold for stay detection.

According to this configuration, it is possible to prevent excessive changes to the threshold for stay detection when a human body enters the detection area (90). For example, if the entry of a human body is detected in the area that is the detection object of the other person detection system (1b), the possibility of detecting the same human body in the detection area (90) is higher. Therefore, by knowing in advance that other human detection systems (1b) have detected a human body, it is not necessary to make excessive changes to the threshold for stay detection.

In the seventh aspect of the human detection system (1, 1a), as in any of the third to sixth aspects, there are a plurality of sensors. When the judging unit (320) performs entry detection, if the output value of at least one of the plurality of sensors exceeds the entry detection threshold, it is determined that the human body has entered the detection area (90), and proceed (start ) Stay detection using the stay detection thresholds corresponding to the plurality of sensors respectively. When the determination unit (320) is performing stay detection, if the output value from at least one of the plurality of sensors exceeds the corresponding stay detection threshold during the absence determination time, it is determined that the human body is present in the detection Area (90).

According to this configuration, the accuracy of the presence detection in the detection area (90) of the human body using a plurality of sensors can be improved.

In the eighth aspect of the human detection system (1, 1a), as in the seventh aspect, wherein the output value of each of the plurality of sensors during the absence of the determination time is lower than In the case of stay detection thresholds corresponding to the plurality of sensors, it is determined that the human body does not exist in the detection area (90), and the entrance detection thresholds corresponding to the plurality of sensors are used to perform (start) the entry detection.

According to this configuration, it is possible to improve the accuracy of non-existence detection in the detection area (90) of the human body using a plurality of sensors.

In the person detection system (1, 1a) of the ninth aspect, such as the seventh or eighth aspect, a threshold for staying detection is set for each of the plurality of sensors. The changing part (321) is used when the output value of one of the plurality of sensors exceeds the threshold value for stay detection corresponding to the one sensor when the judgment part (320) performs the entry detection, Or if it continues to fall below the stay detection threshold during the second time, the stay detection threshold corresponding to the one sensor is changed.

According to this configuration, by changing the plurality of stay detection thresholds corresponding to the plurality of sensors, the accuracy of the micro-motion detection can be improved.

In the tenth aspect of the human detection system (1, 1a), as in any one of the second to ninth aspects, the determining unit (320) preliminarily determines that the human body is not in the detection area (90). When the output value exceeds the threshold for entry detection during the predetermined time, it is determined that the human body is present in the detection area (90). In this case, the determination unit (320) performs (starts) stay detection by using a value smaller than the value set as the stay detection threshold value as the stay detection threshold value.

According to this configuration, it is possible to recover after erroneously detecting that the human body is not in the detection area (90). Furthermore, since a value smaller than the value set as the threshold value for stay detection is set as the threshold value for stay detection for stay detection, the sensitivity of detection can be improved even when the human body is not erroneously detected in the detection area (90). For example, considering that the human body is not detected in the detection area (90) by mistake, the output value of the output signal does not exceed the stay detection threshold set at that time even if the human body's micromotion is detected. Therefore, by using a value smaller than the value set as the threshold value for stay detection as the threshold value for stay detection for stay detection, the above-mentioned erroneous detection can be prevented.

In the eleventh aspect of the human detection system (1, 1a), such as any one of the second to tenth aspects, wherein the determination unit (320) uses a plurality of sensitivities of a plurality of thresholds to detect the human body . Corresponding to a plurality of thresholds, there are different judgment times that are different from each other. The determination unit (320) determines that the human body is absent when the output value does not exceed one threshold within the determination time period corresponding to one of the plurality of thresholds after detecting the entry of the human body into the detection area (90) Detection area (90).

According to this configuration, the detection accuracy of the presence of the human body in the detection area (90) can be improved by performing human detection with a plurality of sensitivities.

The person detection system (1, 1a) of the twelfth aspect is the same as any one of the first to eleventh aspects, and further includes a load control unit (instruction unit 311), which is based on The result of human detection of the output value of the sensor controls the load.

According to this structure, the load can be controlled based on the result of human detection.

In the 13th aspect of the human detection system (1, 1a), as in the 12th aspect, the load is a lighting fixture (41). The load control unit controls the lighting fixture (41) to turn on the lighting fixture (41) if the presence of a human body in the detection area (90) is detected based on the output value. The load control unit controls the lighting fixture (41) to turn off the lighting fixture (41) if it is detected that the human body is not within the detection area (90) based on the output value.

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

In the human detection system (1, 1a) of the fourteenth aspect, as in any one of the first to the thirteenth aspects, it is further provided with a thermal sensor (10) for detecting infrared changes in the detection area (90) ) As a sensor.

According to this structure, the precision of micro-movement detection can be improved in human detection using the thermal electrical sensor (10).

The program of the 15th aspect is a program used to make the computer function as the person detection system (1, 1a) of any one of the first to the 13th aspect.

According to this program, the possibility of false detection in micro-motion detection can be reduced.

1: People detection system 1a: Human detection system 1b: People detection system (other people detection system) 10: Thermal inductance detector (sensor) 10a: Thermal inductance detector 10b: Thermal inductance detector 10c: Thermal inductance detector 10d: Thermal inductance detector 10e: Thermal inductance detector 15: Optical system 30: Detection device 30a: detection device 40: lighting control system 41: lighting fixtures 42: control device 90: detection area 91: Human (human body) 101: Light-receiving element 102: Conversion circuit 103: Amplifying circuit 104: A/D converter 301: Buffer for thermoelectricity 302: Thermoelectric filter section 303: Memory Department 304: Control Department 305: output section 306: Ministry of Communications 310: Detection Department 310a: Detection Department 311: Indication section (load control section) 320: Judgment Department 321: Change Department 321a: Change Department 500: Human detection device 501: Server 502: Network P1: period P2: period P3: period Th1: Threshold for entry detection Th2: Threshold for stay detection t1～t15: time V: output signal (signal) V1: output signal V2: output signal V3: output signal V4: output signal V5: output signal

Fig. 1 is a block diagram showing the structure of a person detection system according to an embodiment of the present invention. Fig. 2 is a diagram showing an example of use of a person detection system according to an embodiment of the present invention. Fig. 3 is a diagram illustrating the change of the threshold for stay detection according to the output signal of the thermal sensor of the human detection system according to an embodiment of the present invention. Fig. 4 is a diagram for explaining the case where the threshold value for stay detection is changed to a larger value in the person detection system according to one embodiment of the present invention. Fig. 5 is a block diagram showing the configuration of a person detection system according to Modification 1 of an embodiment of the present invention. Fig. 6 is a diagram showing the configuration of a person detection system according to Modification 2 of an embodiment of the present invention.

1: People detection system

10: Thermal inductance detector (sensor)

10a: Thermal inductance detector

10b: Thermal inductance detector

10c: Thermal inductance detector

10d: Thermal inductance detector

10e: Thermal inductance detector

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 thermoelectricity

302: Thermoelectric filter section

303: Memory Department

304: Control Department

305: output section

310: Detection Department

311: Indication section (load control section)

320: Judgment Department

321: Change Department

V: output signal (signal)

V1: output signal

V2: output signal

V3: output signal

V4: output signal

V5: output signal

Claims (15)

A human detection system, comprising: a judging unit that receives a signal from a sensor for detecting a human body in a detection area, and based on the received signal, performs a stay detection of the human body in the detection area And the detection of the entry of the human body into the detection area; and a change section that uses the determination section to perform the output value of the sensor when the detection of the entry in the detection area is performed to determine whether to change the stay detection used in the stay detection With the threshold value, when it is determined that the above-mentioned stay detection threshold value is changed, the above-mentioned stay detection threshold value is changed. For example, the person detection system of claim 1, wherein the determination unit uses a threshold value for entry detection set to a fixed value when performing the entry detection, and the threshold value for stay detection is smaller than the threshold value for entry detection. Such as the person detection system of claim 2, wherein the above-mentioned determination unit uses the above-mentioned stay detection threshold when performing the above-mentioned stay detection, and if the output value is continuously lower than the above-mentioned stay detection threshold during the absence of the determination time , It is determined that the human body is not in the detection area. Such as the person detection system of claim 3, where When the above-mentioned changing unit performs the above-mentioned entry detection by the above-mentioned determination unit, if the output value exceeds the above-mentioned stay detection threshold value and is lower than the above-mentioned entry detection threshold value, the first time from when the above-mentioned output value exceeds the above-mentioned stay detection threshold value During the period, the value greater than the maximum output value of the sensor output value is set as the above-mentioned stay detection threshold value. During the second time, if the above-mentioned output value is lower than the above-mentioned stay detection threshold value, it is reduced The above-mentioned threshold for stay detection. For example, in the person detection system of claim 4, when the change unit performs the entry detection in the judgment unit, if the output value exceeds the entry detection threshold at the first time, the stay detection threshold is not performed change. For example, the human detection system of claim 4 or 5, wherein when the above-mentioned change unit performs the above-mentioned entry detection by the above-mentioned determination unit, if the signal of the purpose of detecting the above-mentioned human body is received from another human detection system at the above-mentioned first time, then The above-mentioned stay detection threshold is not changed. For example, the person detection system of any one of Claims 3 to 5, wherein there are a plurality of the above-mentioned sensors, and the above-mentioned determination unit is: in the case of performing the above-mentioned entry detection, if at least one of the above-mentioned plural sensors senses If the output value of the sensor exceeds the entry detection threshold, it is determined that the human body has entered the detection area, and the stay detection thresholds corresponding to the plurality of sensors are used. If the output value of at least one of the plurality of sensors exceeds the corresponding threshold value for the stay detection in the case of the above-mentioned stay detection, if the output value from at least one of the plurality of sensors exceeds the corresponding threshold value for the stay detection during the above-mentioned non-existence determination time It is determined that the human body exists in the above-mentioned detection area. Such as the person detection system of claim 7, wherein the determination unit is: during the non-existence determination time, if the output value of each of the plurality of sensors is lower than the stay corresponding to the plurality of sensors respectively With the detection threshold, it is determined that the human body is not in the detection area, and the entry detection is performed using the entry detection thresholds corresponding to the plurality of sensors, respectively. For example, the person detection system of claim 7, wherein the threshold value for stay detection is set for each of the plurality of sensors, and when the change unit performs the entry detection by the determination unit, if the plurality of sensors are If the output value of one sensor exceeds the above-mentioned stay detection threshold corresponding to the one sensor, or if it continues to fall below the above-mentioned stay detection threshold during the second time, the sensor will be changed Corresponds to the above threshold for stay detection. For example, the human detection system of any one of Claims 2 to 5, wherein if the output value exceeds the threshold value for entry detection during the predetermined period of time since it is determined that the human body is not in the detection area, the determination unit determines that The human body is present in the detection area, and a value smaller than the value set as the threshold value for stay detection is set as the upper The above-mentioned stay detection is performed by the above-mentioned stay detection threshold value. For example, the human detection system of any one of Claims 2 to 5, wherein the determination unit detects the human body by using a plurality of sensitivities of a plurality of thresholds, and the establishment of correspondences for the plurality of thresholds has a long determination time that is different from each other, After the determination unit detects the entry of the human body into the detection area, if the output value does not exceed the one threshold within the determination time corresponding to one of the plurality of thresholds, it is determined that the human body is not in the detection area. For example, the person detection system of any one of claims 1 to 5 further includes a load control unit that controls the load based on the result of the person detection based on the output value of the sensor. For example, the person detection system of claim 12, wherein the load is a lighting appliance, and if the load control unit detects that the human body is present in the detection area based on the output value, it controls the lighting appliance in such a way that the lighting appliance lights up, If it is detected based on the output value that the human body is not within the detection area, the lighting fixture is controlled such that the lighting fixture is turned off. Such as the person detection system of any one of claims 1 to 5, which is further provided with a thermoelectric sensor that detects infrared changes in the detection area as the sensor. A program used to make a computer function as a person detection system as in any one of claims 1-13.

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