JP2019158756A - Person detection system and person detection method - Google Patents

Abstract

To provide a technique capable of improving accuracy of a person detection system using a thermopile sensor.SOLUTION: A person detection system comprises: one or more infrared sensors for detecting the amount of infrared ray emitted from an object body in a detection area by using a thermoelectric effect; an illuminance sensor for detecting the illuminance in the detection area; and a control device for connecting the one or more infrared sensors and the illuminance sensor. The control device includes invalidation means for acquiring illuminance in the detection area of the one or more infrared sensors and invalidating detection of an object body of an infrared sensor, among the one or more infrared sensors, which is associated with a detection area where the acquired illuminance exceeds a predetermined threshold.SELECTED DRAWING: Figure 12

Description

  The present invention relates to a human detection system and a human detection method using a thermopile sensor.

Conventionally, a non-contact type infrared sensor that detects infrared rays emitted from an object such as a human body is known. Examples of such an infrared sensor include a pyroelectric infrared sensor and a thermopile infrared sensor (hereinafter also referred to as “thermopile sensor”). The former is, for example, a sensor that detects a change in the amount of infrared radiation emitted from an object using a pyroelectric effect generated in a pyroelectric body (pyroelectric element) made of a ferroelectric material, ceramic, or the like. is there. The latter is a sensor that detects the amount of infrared rays emitted from an object using a Seebeck effect in which a thermoelectromotive force is generated according to a temperature difference between two types of metal contacts.

  The pyroelectric infrared sensor can detect a phenomenon in which the amount of infrared rays from an object changes, for example, can detect the entry / exit of a human body or the like into a detection target region. On the other hand, in a situation where a human body or the like is stationary within the detection target region, the detected amount of infrared rays does not change from a constant state, so that it is difficult to detect the human body or the like. However, since the thermopile sensor can directly detect the amount of infrared rays emitted from a human body or the like as electric energy (thermoelectromotive force), it can detect a stationary human body or the like in which the amount of infrared rays does not change from a constant state. .

  By using the thermopile sensor, it becomes possible to measure the temperature of the object existing in the detection target region, and to know the presence / absence and the deviation (distribution) of the object. For example, a human detection system is configured by combining one or more thermopile sensors, and the presence / absence of a human body or the like in a room such as an office or a house is detected by combining the human detection system with an air conditioning facility or a lighting facility. Air conditioning control and lighting control according to the position distribution are possible. Further, by grasping the temporal position change (dynamic transition) of the object detected by one or more thermopile sensors, for example, it is possible to watch and monitor a human body or the like in an area where privacy protection is required. .

  In addition, the following patent documents exist as prior art documents in which technologies related to the technologies described in this specification are described.

JP2013-93103A

  As described above, the thermopile infrared sensor detects the amount of infrared radiation emitted from the object as electrical energy. For this reason, for example, when an object (for example, a floor surface, a wall surface, a desk, etc.) in a detection target area of a thermopile infrared sensor provided in a room such as an office or a house rises due to solar radiation, There is a possibility that the raised object is erroneously detected as a human body.

  When configuring a human detection system, in order to prevent the above-mentioned erroneous detection, for example, the range where the solar radiation such as the indoor window side shines is excluded from the installation location of the thermopile sensor, or the thermopile sensor provided in the range where the solar radiation shines. Measures such as fixing the detection function to invalid in advance have been taken.

  However, even if the above measures can prevent erroneous detection due to solar radiation of the thermopile sensor, the detection accuracy of the human detection system that detects a human body or the like existing in the room cannot be improved. In order to improve the detection accuracy of the human detection system, it is preferable that a human body or the like can be detected using a thermopile sensor even if there is a range in which solar radiation shines.

  The present invention has been made in consideration of the above-described problems, and an object thereof is to provide a technique that can improve the accuracy of a human detection system using a thermopile sensor.

  The present invention is exemplified by a human detection system. That is, the human detection system includes one or more infrared sensors that detect the amount of infrared rays radiated by the object in the detection region using a thermoelectric effect, an illuminance sensor that detects the illuminance in the detection region, and the one or more infrared sensors. An infrared sensor and a control device connected to the illuminance sensor, wherein the control device acquires illuminance within a detection region of the one or more infrared sensors, and among the one or more infrared sensors, It comprises an invalidating means for invalidating the detection of the object by the infrared sensor associated with the detection area where the acquired illuminance exceeds a predetermined threshold.

  According to such a configuration, the human body detection in the detection area by the infrared sensor can be validated / invalidated according to the illuminance change of the illuminance data detected through the illuminance sensor even if there is a range where the solar radiation shines in the room. Can be set. Even if there is a range in which solar radiation shines in the room, a human body or the like can be detected using an infrared sensor.

  Moreover, in this invention, the said control apparatus is the 1st adjoining adjacent to the said invalidated detection area | region from the detection area | region of the infrared sensor in which the detection of the said target object is effective among the said 1 or more infrared sensors. Predetermined detection information including at least one of a specifying means for specifying a detection area, the number of the objects detected in the first adjacent detection area, and the distribution of the objects in the first adjacent detection area And a storage means for storing the detection information acquired from the first adjacent detection area in association with time information, and the invalidated detection area from the time series of the stored detection information Estimation means for estimating the entry / exit of the object relative to.

  According to this configuration, it is possible to estimate the entry / exit of a human body or the like to the invalidated detection area based on the human body detection information detected in the detection area of another infrared sensor adjacent to the invalidated detection area. Even when there is a range in which solar radiation shines indoors, it is possible to improve human detection accuracy based on human body detection information detected in the detection area of another adjacent infrared sensor.

  In the present invention, the detection information includes the presence / absence of the object for each of a plurality of divided areas obtained by equally dividing the detection area, and the specifying unit is invalidated in the first adjacent detection area. A region that is in contact with the boundary between the detected region and the estimation unit is configured to determine whether or not the invalidation is performed based on a change in the presence or absence of the object in the identified region in the time series of the detection information. The entering / exiting of the object with respect to the detected detection area may be estimated. According to this configuration, it is possible to improve the human detection accuracy based on the human body detection information detected in the divided area in contact with the boundary with the invalidated detection area.

Further, in the present invention, the estimation means specifies a non-detection region in which the object is not detected over a certain period in the first adjacent detection region from the accumulated time series of the detection information, The target for the invalidated detection region from the change in the presence or absence of the target in the first adjacent detection region excluding the specified non-detection region in the accumulated time series of the detection information You may make it estimate the entrance / exit of a body. According to such a configuration, it is possible to increase the estimation accuracy of the human body and the like entering and exiting the invalidated detection area and reduce the processing load related to the estimation.

  In the present invention, the estimating means may identify the non-detection area based on architectural space information including position information of at least one of a wall, a door, furniture, a passage, and equipment in the detection area. Also good. According to such a configuration, it is possible to further increase the estimated degree of purification of the human body and the like entering and exiting the invalidated detection region and reduce the processing burden.

  Further, in the present invention, the specifying unit is configured to detect the detection area of the one or more infrared sensors based on map information including an installation position of the one or more infrared sensors and a non-installation area of the one or more infrared sensors. A second adjacent detection area adjacent to the non-installation area is identified, and the estimation means includes the presence / absence of the object in the specified second adjacent detection area in the time series of the accumulated detection information The entrance / exit of the object with respect to the non-installation area may be estimated from the change of the above. According to this configuration, it is possible to estimate the entry / exit of a human body or the like to / from the non-installation area based on the human body detection information detected in the detection area of another infrared sensor adjacent to the non-installation area.

  In the present invention, the control device estimates the object in the invalidated detection area when the estimation means estimates the entry / exit of the object with respect to the invalidated detection area. Output means for adding information indicating that the data is output and outputting the information may be further included. According to such a configuration, it can be identified that the human body detection information in the invalidated detection area or the non-installation area of the infrared sensor is in the estimated state.

  In addition, the present invention provides at least one infrared sensor that detects the amount of infrared rays emitted from an object within a detection region using a thermoelectric effect, an illuminance sensor that detects illuminance within the detection region, and the one or more infrared rays. In a human detection system having a sensor and a control device connected to the illuminance sensor, the illuminance in the detection area of the one or more infrared sensors is acquired, and the acquired illuminance is the one of the one or more infrared sensors. A human detection method characterized by executing an invalidation step of invalidating the detection of the object by an infrared sensor associated with a detection region exceeding a predetermined threshold.

  The present invention can be specified as a human detection system including at least a part of the above means and processing, or a control system such as lighting control. The above processes and means can be freely combined and implemented as long as no technical contradiction occurs.

  ADVANTAGE OF THE INVENTION According to this invention, the technique which enables the precision improvement of the human detection system using a thermopile sensor can be provided.

It is a figure which shows an example of the block configuration of the thermopile sensor which concerns on embodiment. It is the perspective view which looked at the form accommodated in the cylindrical housing | casing of the thermopile sensor which concerns on embodiment from the floor surface side. It is a figure explaining the detection ranges, such as a human body, of the thermopile sensor which concerns on embodiment. It is a figure which shows an example of the detection temperature characteristic of the thermopile sensor which concerns on embodiment. It is a figure explaining the division area into which the detection range was subdivided. It is a figure which shows an example of a structure of the human detection system which concerns on embodiment. It is a figure explaining the human body detection process in the room where the range which solar radiation injects exists. It is a figure which shows an example of the multidrop structure by daisy chain connection. It is a figure explaining the communication procedure in a person detection system. It is a figure which shows an example of the response response of a thermopile sensor at the time of 16 division. It is a figure explaining the form which makes permission / disapproval for every division area about detection of a human body etc. FIG. It is a flowchart which shows an example of the detection process which concerns on embodiment. It is a flowchart which shows an example of the detection process which concerns on embodiment.

  Hereinafter, a human detection system according to an embodiment will be described with reference to the drawings. The configuration of the following embodiment is an exemplification, and the person detection system is not limited to the configuration of the embodiment.

<1. Thermopile sensor>
First, the thermopile sensor which comprises the human detection system which concerns on this embodiment is demonstrated.
(Block configuration)
FIG. 1 is a diagram illustrating an example of a block configuration of the thermopile sensor 2. The thermopile sensor 2 is a non-contact type infrared sensor that detects infrared rays radiated from an object such as a human body existing in a detection target region. As illustrated in FIG. 1, the thermopile sensor 2 includes a MEMS (Micro Electro Mechanical Systems) non-contact temperature sensor 2a connected to an MCU (Micro Control Unit) 2e, and an illuminance sensor 2b. The thermopile sensor 2 includes a power supply IF (Interface) 2f connected to the MCU 2e, a communication IF 2g, an input / output IF 2h,
And display LEDs (2c, 2d).

  The MEMS non-contact temperature sensor 2a is an infrared array sensor in which thermopile elements (thermocouple arrays) that are MEMS devices are arranged in a plurality. A thermopile element measures the temperature according to the amount of infrared rays radiated from the object through the thermoelectromotive force according to the temperature difference between two kinds of metal (for example, bismuth and antimony) contacts.

For example, the MEMS non-contact temperature sensor 2a collects infrared rays radiated from an object in the detection target region via an optical system (lens) (not shown), and collects the collected infrared rays with a hot contact point of a thermopile element ( Hot junctions are concentrated and absorbed by the heat-sensitive part. The MEMS non-contact temperature sensor 2a is a target through a thermoelectromotive force according to a temperature difference between a cold junction of a thermopile element that is in contact with a location where the temperature inside the sensor is difficult to change and a cold junction of the thermopile element. Measure the temperature of the object. The temperature measured by the MEMS non-contact temperature sensor 2a is output to the MCU 2e.

  The illuminance sensor 2b is a light detection device such as a photodiode or a phototransistor. The illuminance sensor 2b detects the illuminance of the detection target area of the MEMS non-contact temperature sensor 2a, and outputs the detected illuminance to the MCU 2e.

  The display LEDs (2c, 2d) are LEDs that indicate the operating state of the thermopile sensor 2. The display LED 2c is lit (for example, lit in green) when, for example, the thermopile sensor 2 is in an energized state and is communicable with another device via the communication IF 2g. The display LED 2c is always lit when the thermopile sensor 2 satisfies the above state. Further, for example, the display LED 2d is turned on when a human body or the like is detected in the detection target area of the thermopile sensor 2, and is turned off when a human body or the like is not detected.

The MCU 2e is a control unit that controls the entire thermopile sensor 2. The MCU 2e includes a processor such as an MPU (Microprocessor) (not shown), a flash memory, a RAM (Random Access Memory), a ROM (Read Only Memory), and the like. The processor of the MCU 2e controls peripheral devices by reading and executing programs and various data stored in a ROM or the like, and provides the function of the thermopile sensor 2 that matches a predetermined purpose.

  The power supply IF 2 f is a power supply interface for driving the thermopile sensor 2. For example, the power supply IF 2 f generates DC power for various devices constituting the thermopile sensor 2 from DC power supplied via a connection terminal (not shown), and supplies the generated DC power to various devices.

  The communication IF 2g is a communication interface with other devices (including other thermopile sensors 2) connected to the thermopile sensor 2. As a communication standard that the thermopile sensor 2 can use, RS-485 standard serial communication is exemplified. The input / output IF 2h is an input / output interface with a setting switch, an output terminal, and the like that the thermopile sensor 2 has.

  The thermopile sensor 2 has the configuration shown in FIG. 1 housed in a cylindrical casing, and is installed on the ceiling of a room such as an office or a house. FIG. 2 illustrates a perspective view of the thermopile sensor 2 in a form housed in a cylindrical housing as viewed from the floor surface side.

  As shown in FIG. 2, the housing surface facing the floor surface of the thermopile sensor 2 is provided with openings for the MEMS non-contact temperature sensor 2a, the illuminance sensor 2b, the display LEDs 2c, and 2d. The opening hole for the MEMS non-contact temperature sensor 2a is provided in the rough center portion of the casing surface. Further, the aperture holes of the illuminance sensor 2b and the display LEDs 2c and 2d are provided in a linear alignment at positions relatively distant from the rough central portion of the housing surface.

  The MEMS non-contact temperature sensor 2a detects infrared rays radiated from an object such as a human body existing in the detection target region through an opening provided in the housing surface. Similarly, the illuminance sensor 2b detects the illuminance of the detection target region through the opening hole provided in the casing surface. Further, the display LEDs 2c and 2d present the operating state of the thermopile sensor 2 through the opening hole provided in the housing surface.

  A pair of attachment springs 2 i are provided in the diameter direction on the side surface of the cylindrical casing of the thermopile sensor 2. The housing of the thermopile sensor 2 is installed, for example, in a mounting hole provided in a ceiling panel or the like constituting the ceiling so that the housing surface provided with the opening hole is opposed to the floor surface. The mounting spring 2i provided in the diameter direction biases the wall surface of the mounting hole in which the cylindrical casing is embedded, and fixes the casing of the thermopile sensor 2 mounted on the ceiling panel or the like.

(Detection target area)
FIG. 3 is a diagram for explaining a detection target region such as a human body of the thermopile sensor 2. The detection target area (detection range) illustrated in FIG. 3 is an example of a detection range when the thermopile sensor 2 is installed on a ceiling in a room such as an office or a house. In FIG. 3, a rectangular detection range 4 represents a detection target area for detecting a human body or the like of the thermopile sensor 2 installed on the ceiling 3.

  When the height from the floor surface 5 of the ceiling 3 on which the thermopile sensor 2 is installed is 2.7 m to 3 m, the rectangular detection range 4 is a housing surface provided with an opening hole such as the MEMS non-contact temperature sensor 2a. Is defined at a height of about 2 m. The rectangular detection range 4 of the thermopile sensor 2 is, for example, an area range of about 3.6 m × 3.6 m centered directly below the opening hole of the MEMS non-contact temperature sensor 2a.

The thermopile sensor 2 detects the presence / absence of a person based on infrared rays radiated from an object such as a human body existing in the rectangular detection range 4. The thermopile sensor 2 is, for example, a human body that exists in the detection range 4 on the condition that the temperature of the human body to be detected is within a range of 16 degrees to 29 degrees and the temperature of the human body is relatively higher than the ambient temperature by 4 degrees or more. Is detected. The thermopile sensor 2 can detect a human body that moves in the detection range 4 at a speed of 0.3 m / s to 1 m / s.

  The thermopile sensor 2 measures the temperature of the object based on infrared rays radiated from the object such as a human body existing in the rectangular detection range 4. In FIG. 4, an example of the detection temperature characteristic of the thermopile sensor 2 is shown.

  In FIG. 4, the vertical axis represents the temperature inside the sensor (reference temperature (° C.)) at which the cold junction of the thermopile element constituting the MEMS non-contact temperature sensor 2 a is in contact, and the horizontal axis represents the temperature of the object to be measured ( Object temperature (° C)). The hatched temperature region in FIG. 4 represents the temperature range of the object detected by the thermopile sensor 2.

  As shown in the hatched temperature region of FIG. 4, the thermopile sensor 2 measures the temperature of an object such as a human body existing in the detection range 4 with an accuracy of ± 3 ° C. in a temperature range of 5 ° C. to 50 ° C. The temperature resolution (NETD: Noise Equivalent Temperature Difference) related to the temperature measurement of the thermopile sensor 2 is 0.45 ° C.

  The illuminance sensor 2b detects the illuminance of the floor surface 5 immediately below the sensor to which the thermopile sensor 2 is attached. For example, the illuminance sensor 2b detects the illuminance of the floor surface 5 immediately below the sensor within a detection range (detection accuracy: ± 5% FS) of 10 to 2000 lux. Further, the illuminance detected by the illuminance sensor 2 b may be an average value within the detection range 4.

  As already described, the MEMS non-contact temperature sensor 2a of the thermopile sensor 2 is composed of one or more thermopile elements (thermocouple arrays). Each of the one or more thermopile elements constituting the MEMS non-contact temperature sensor 2a can detect the temperature of the human body and the presence / absence of the person.

  However, the rectangular detection range 4 of the thermopile sensor 2 shown in FIG. 3 is subdivided into divided regions corresponding to the number of one or more thermopile elements constituting the MEMS non-contact temperature sensor 2a. One or more thermopile elements constituting the MEMS non-contact temperature sensor 2a detect the temperature of a human body and the presence / absence of a person in a divided area within the subdivided detection range 4 corresponding to each.

  FIGS. 5A and 5B are diagrams for explaining the divided areas into which the detection range 4 is subdivided. FIG. 5A is an explanatory diagram of divided regions in a “2 × 2” element configuration in which thermopile elements are arranged in two elements in the vertical direction and two elements in the horizontal direction. FIG. 5 (2) is an explanatory diagram of divided regions in a “4 × 4” element configuration in which thermopile elements are arranged in four elements in the vertical direction and four elements in the horizontal direction. The forms shown in FIGS. 5A and 5B are examples of forms for detecting the temperature of the human body and the presence / absence of a person for each divided region.

  As shown in FIG. 5A, in the “2 × 2” element configuration, the detection range 4 shown in FIG. 3 is equally divided into four corresponding to the number of thermopile elements. Each divided area of the detection range 4 divided into four has a rectangular area range of about 1.8 m × 1.8 m.

In the “2 × 2” element form, the thermopile element arranged at the upper left detects a human body or the like corresponding to the upper left divided region to which the number “1” is assigned, and the thermopile element arranged at the upper right has the number “ The human body or the like is detected in correspondence with the upper right divided region to which “2” is assigned. Similarly, the thermopile element arranged in the lower left performs detection of a human body or the like corresponding to the lower left divided region assigned the number “3”, and the thermopile element arranged in the lower right gives the number “4”. The human body or the like is detected corresponding to the divided area on the lower right.

  In the “2 × 2” element configuration shown in FIG. 5A, the temperature of the human body and the presence / absence of a person are detected for each divided region of the equally divided detection range 4. For this reason, in the “2 × 2” element configuration shown in FIG. 5A, the thermopile sensor 2 can detect up to four people based on the presence / absence of people in each divided region, and the detection range 4 It becomes possible to specify the distribution of people existing within.

  The “4 × 4” element configuration in which the thermopile elements are arranged in four elements in the vertical direction and four elements in the horizontal direction is the same as the “2 × 2” mode. That is, as shown in FIG. 5 (2), the detection range 4 shown in FIG. 3 is divided into 16 parts corresponding to the number of thermopile elements. Each divided area of the detection range 4 divided into 16 has a rectangular area range of about 0.9 m × 0.9 m.

  In the “4 × 4” element form, the thermopile element arranged at the upper left detects a human body or the like corresponding to the upper left divided region to which the number “1” is assigned, and the thermopile arranged at the upper right. In the element, detection of a human body or the like is performed corresponding to the upper right divided region to which the number “4” is assigned. Similarly, in the thermopile elements arranged in the lower left, a human body or the like is detected corresponding to the lower left divided region given the number “13”, and in the thermopile elements arranged in the lower right, the number “14” is detected. A human body or the like is detected corresponding to the assigned lower right divided area.

  In the “4 × 4” element configuration shown in FIG. 5 (2), the thermopile sensor 2 detects up to 16 people based on the presence / absence of people in each divided area of about 0.9 m × 0.9 m. In addition, it is possible to specify the distribution of people existing within the detection range 4. In the “4 × 4” element form, the distribution of people existing in the detection range 4 of about 3.6 m × 3.6 m can be specified with an accuracy of an area range of about 0.9 m × 0.9 m.

<2. Human detection system>
Next, the human detection system according to the present embodiment will be described.
(System configuration)
FIG. 6 is a diagram illustrating an example of the configuration of the human detection system 1 according to the present embodiment. The human detection system 1 shown in FIG. 6 is an example of a form that can be combined with a control system that controls the living environment according to the presence / absence of a human body or the like in a room such as a factory, a school, a corporate office, or a house, and the position distribution. . Examples of the control system that controls such a living environment include an air conditioning control system and a lighting control system. However, the human detection system 1 may be combined with a monitoring system that monitors and monitors a human body or the like occupying an elderly facility or the like. Any control system may be used as long as various services are provided using information such as the presence / absence of the human body and the position distribution detected by the human detection system 1. The human detection system 1 may constitute a part of the control system.

  The human detection system 1 illustrated in FIG. 6 includes a control device 10 connected to one or more thermopile sensors 2 (2 # 1 to 2 # N: N is an integer of 1 or more). As described with reference to FIGS. 1 to 5, the thermopile sensor 2 provided on the ceiling of the room has a detection area area of about 3.6 m × 3.6 m centering on the position directly below the MEMS non-contact temperature sensor 2 a. It has range 4. The human detection system 1 includes one or more thermopile sensors 2, thereby enabling detection of the presence / absence of a human body or the like in a wide range of rooms such as an office, position distribution, and temporal position change (dynamic transition). .

In FIG. 6, the control device 10 includes a CPU (Central Processing Unit) 11, a main storage device 12, an auxiliary storage device 13, a communication IF 14, and an input / output IF 15 that are connected to each other via a connection bus 16. The main storage device 12 and the auxiliary storage device 13 are recording media that can be read by the control device 10. The control device 10 expands the program stored in the auxiliary storage device 13 in the work area of the main storage device 12 so that the CPU 11 can be executed, and controls peripheral devices through the execution of the program, thereby meeting a predetermined purpose. Provide functionality.

  The CPU 11 is a central processing unit that controls the entire control device 10. The CPU 11 is also called an MPU (Microprocessor) or a processor. However, the CPU 11 is not limited to a single processor and may have a multiprocessor configuration. A single CPU 11 connected by a single socket may have a multi-core configuration. The CPU 11 performs processing according to a program stored in the auxiliary storage device 13.

The main storage device 12 is a storage medium in which the CPU 11 caches programs and data and develops a work area. The main storage device 12 includes, for example, a flash memory, a RAM (Random Access Memory), and a ROM (Read Only Memory). The auxiliary storage device 13 is a storage medium that stores programs executed by the CPU 11, operation setting information, and the like. The auxiliary storage device 13 is, for example, an HDD (Hard-disk Drive), an SSD (Solid State Drive), an EPROM (Erasable Programmable ROM), a flash memory, or the like. The communication IF 14 is an interface with a wired or wireless network connected to the control device 10. The network includes RS-485 standard serial communication in which the thermopile sensor 2 can be used. The input / output IF 15 is an interface for inputting / outputting data to / from a device connected to the control device 10. Note that a plurality of the above-described components may be provided, or some of the components may not be provided.

  In the control device 10, the presence / absence of the human body etc., the number of persons, the temperature of the human body, etc. within the detection range 4 detected by the thermopile sensor 2 are acquired via the communication IF 14. In addition, the illuminance of the floor surface 5 directly below the sensor detected via the illuminance sensor 2 b of the thermopile sensor 2 is acquired via the communication IF 14. Similarly, an operation input via an input device such as a remote controller, a pointing device, or a keyboard is accepted via the input / output IF 15. Further, display data and information on a display device such as an LCD (Liquid Crystal Display) are output via the input / output IF 15.

Note that at least a part of the processes executed by the control device 10 may be provided by a DSP (Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), or the like. Further, at least a part of the processing may be an FPGA (Field-Programmable Gate Array), a numerical processor, a dedicated LSI (Large Scale Integration) such as a vector processor, or other digital circuits. Further, an analog circuit may be included in at least a part of the processing.

(Function of this embodiment)
The human detection system 1 according to the present embodiment has a detection range of the thermopile sensor 2 on the condition that the illuminance data of the floor surface 5 directly below the sensor detected via the illuminance sensor 2b of the thermopile sensor 2 exceeds a predetermined threshold. 4 disables human body detection. The invalidation of the human body detection based on the illuminance data is performed with the area range of the detection range 4 as a unit.

As a result, the human detection system 1 according to the present embodiment uses the thermopile sensor 2 when the illuminance data detected through the illuminance sensor 2b is equal to or less than a predetermined threshold even if there is a range in which solar radiation is radiated. Human body detection can be enabled. For example, human bodies can be detected via the thermopile sensor 2 under conditions such as rainy weather, cloudy weather, and nighttime when sunlight does not enter the room.

  Here, the predetermined threshold value for the illuminance data can be experimentally obtained in advance. For example, the installer or manager of a control system including the human detection system 1 acquires illuminance data of the indoor range that is irradiated by solar radiation or the like via the thermopile sensor 2 installed on the ceiling or the like. The manager or the like acquires, for example, illuminance data of the indoor range in which solar radiation or the like that changes in units of weeks, months, seasons, or the like. The administrator or the like may determine the predetermined threshold based on the acquired illuminance data, for example. The determined predetermined threshold value is stored in, for example, the auxiliary storage device 13 of the control device 10. The predetermined threshold for the illuminance data may be changed according to the daily history, the monthly history, the season, etc., reflecting the solar radiation that changes in units of weeks, months, seasons, etc.

  The illuminance data may be acquired from an illuminance sensor included in a control system (for example, an illumination control system) combined with the human detection system 1, for example. It is sufficient that at least the illuminance data in the range in which the indoor shot is shot, including the detection range 4 of the thermopile sensor 2 and a part of the detection range 4, can be acquired. For example, the control device 10 may acquire illuminance data detected by an illuminance sensor included in the control system or the like via the communication IF 14. Hereinafter, the illuminance data will be described as illuminance data detected by the illuminance sensor 2b of the thermopile sensor 2.

  In addition, when the human detection system 1 according to the present embodiment invalidates the human body detection in the detection range 4 based on the illuminance data, the human detection system 1 is within the detection range of the other thermopile sensor 2 adjacent to the invalidated detection range 4. On the basis of the human body detection information detected in step S1, the entry / exit of the human body etc. into the invalidated detection range 4 is estimated.

  For example, as described with reference to FIGS. 1 to 5, the human detection information detected by the thermopile sensor 2 is the presence / absence of the human body in the detection range 4, the number of persons, the temperature of the human body, and the like. The presence / absence of a human body or the like in the detection range 4 is detected for each divided region that is equally divided according to the arrangement of the thermopile elements. The human detection system 1 combines, for example, the temporal transition (dynamic change) of the presence / absence of the human body detected for each divided area and the temporal change of the number of persons counted within the detection range 4. It is possible to estimate the entry / exit of a human body or the like between adjacent detection ranges.

  Based on the human body detection information detected in the detection range of another thermopile sensor 2 adjacent to the invalidated detection range 4, the human detection system 1 estimates the entry / exit of a human body or the like into the invalidated detection range 4 By doing so, it becomes possible to improve human detection accuracy. In the human detection system 1 according to the present embodiment, the human detection accuracy based on the human body detection information detected within the detection range of another adjacent thermopile sensor 2 is present even when there is a range in which solar radiation shines in the room. Improvement is possible.

  In the estimation described above, the human detection system 1 may exclude the detection range 4 in which a human body or the like is not detected continuously for a predetermined period, or a divided region in the detection range 4. The human detection system 1 according to the present embodiment eliminates the detection range 4 in which a human body or the like is not detected continuously for a predetermined period, or the divided areas in the detection range 4, thereby invalidating the detection range. It is possible to improve the estimation accuracy of going in and out and reduce the processing load related to estimation.

  According to the human detection system 1 according to the present embodiment, the accuracy of the human detection system using the thermopile sensor 2 can be improved.

<3. Processing example>
Next, the human body detection process of the human detection system 1 according to the present embodiment will be described with reference to FIG.
FIG. 7 is a diagram illustrating human body detection processing in a room where there is a range in which solar radiation shines. In the explanatory example of FIG. 7, the human detection system 1 is configured to include 16 thermopile sensors 2 (2 # 1 to 2 # 16). Regions B1 to B8 and regions C1 to C8 shown in FIG. 7 represent detection ranges 4 of the thermopile sensor 2 installed on the ceiling, respectively.

  For example, region B1 corresponds to detection range 4 of thermopile sensor 2 # 1, and region B8 corresponds to detection range 4 of thermopile sensor 2 # 8. Region C1 corresponds to detection range 4 of thermopile sensor 2 # 9, and region C8 corresponds to detection range 4 of thermopile sensor 2 # 16. In FIG. 7, hatched areas C1, C2, C3, C4, C5, and C7 represent indoor areas in which solar radiation is radiated through windows or the like.

  As described with reference to FIGS. 3 to 5, the detection range 4 of the thermopile sensor 2 can be subdivided into divided regions corresponding to the number of one or more thermopile elements constituting the MEMS non-contact temperature sensor 2a. . In the example of FIG. 7, each thermopile sensor 2 is configured in the form of a “4 × 4” thermopile element, and each detection range 4 is a detection area associated with each thermopile element, that is, a 16-divided divided area. Subdivided. In each divided area, the distribution of people existing in the detection range 4 can be specified by the area range of the divided area.

  The divided areas U1 to U16 shown in the area B1 of FIG. 7 represent the subdivided areas of the detection range 4 divided into 16 in the “4 × 4” element form. The same applies to the areas B2 to B8 and the areas C1 to C8 shown in FIG.

  In FIG. 7, hatched divided areas, for example, divided areas U <b> 6 and U <b> 10 of the area B <b> 2 represent areas where the presence of a human body or the like is detected via the thermopile sensor 2. Division of division area U16 of area B3, division area U13 of area B4, division area U7 of area B5, division areas U13 and U14 of area B7, division areas U6 and U10 of area B8, division area U1 of area C6, and area C8 The same applies to the regions U5 and U13.

  In the human detection system 1, for example, the control device 10 and the thermopile sensor 2 # 1 to the thermopile sensor 2 # 16 are connected using the connection form shown in FIG. FIG. 8 shows an example of a multi-drop configuration by daisy chain connection. In the connection form of FIG. 8, a thick solid line represents a communication connection such as RS-485, and a solid line represents a power connection. In the connection form in FIG. 8, power is supplied from the control device 10 to each thermopile sensor 2. However, for example, power may be supplied from the control system combined with the human detection system 1.

  The human detection system 1 acquires illuminance data from each thermopile sensor 2 connected in the form shown in FIG. 8, and detects a human body or the like in the detection range 4 for each thermopile sensor 2 based on the acquired illuminance data. Disable it. Further, in the human detection system 1, another thermopile sensor 2 adjacent to the invalidated thermopile sensor 2 is specified, and based on the human detection information in the detection range 4 of the specified other thermopile sensor 2. The entry / exit of a person or the like into the invalidated detection range is estimated.

In the human detection system 1 connected in a multi-drop configuration by daisy chain connection in FIG. 8, up to 16 thermopile sensors 2 are connected on the same bus. In the human detection system 1, for example, communication by the master-slave method is performed using the control device 10 as a master device and each thermopile sensor 2 connected in a daisy chain as a slave device. In the connection form of FIG. 8, in the thermopile sensor 2 # 16 at the final stage on the daisy chain connected bus, for example, the communication transmission line is terminated via a terminating resistance = 120Ω. The termination setting of the communication transmission path is set by, for example, a setting switch of the thermopile sensor 2 # 16.

In the connection form of FIG. 8, an ID address uniquely identifying each thermopile sensor 2 connected on the same bus is assigned. In each thermopile sensor 2, for example, a DIP switch (Dual In-line Package switch) or the like included in each of the thermopile sensors 2
D address is set. However, the control device 10 of the human detection system 1 may assign an ID address for uniquely identifying each thermopile sensor 2 connected on the same bus, and manage the assigned ID address. ID addresses can be managed according to the scale of various control systems combined with the human detection system 1.

  FIG. 9 is a diagram for explaining a communication procedure in the human detection system 1. FIG. 9 shows a master-slave type communication in which the control device 10 is a master device and each thermopile sensor 2 (2 # 1, 2 # 2) connected in a daisy chain is a slave device to perform communication by specifying an ID address. It is an example of a procedure. As such a communication procedure, for example, a communication procedure compliant with Modbus (registered trademark) Protocol RTU mode of Modicon Corporation is exemplified. In the above communication procedure, in addition to communication designating an ID address, it is possible to perform broadcast in which a master device performs data communication simultaneously to one or more thermopile sensors 2 connected on the same bus.

  As shown in FIG. 9, in the human detection system 1, the start-up completion of each slave device connected on the bus (for example, the communicable state after the energized state) is triggered between the master device and each slave device. Communication is possible. For example, the control device 10 that is a master device receives a notification of power supply to each slave device or a power supply from the control system combined with the human detection system 1, and after a predetermined period (“start-up waiting t 1”) has elapsed. The communication with the slave device may be started. Note that, in the thermopile sensor 2 that is a slave device after completion of activation, for example, the display LED 2c is lit in green.

  In the human detection system 1, for example, serial communication conforming to the Modbus (registered trademark) Protocol RTU mode of Modicon Corporation is performed between each slave device connected to the bus and the master device. The control device 10 of the master device transmits various commands by specifying the ID address of the slave device to be communicated (t2, t4, t6). Each slave device monitors the communication data on the bus, and when the communication data includes the ID address of the slave device, it responds with a response corresponding to the command (t3, t5, t7). As shown in FIG. 9, after receiving communication data including various commands, each slave device transmits a response corresponding to the command to the master device after a predetermined internal processing time (maximum 200 msec) has elapsed. The human detection system 1 may detect a change in temperature state of a predetermined size of each slave device connected on the bus as an event, and may employ data communication between the master and the slave triggered by the detection. . In the human detection system 1, it is possible to reduce the communication load and capture the state change detected by each slave device.

  As shown in FIG. 9, in the serial communication, when there are a plurality of slave devices on the bus, from the completion of the response response transmitted from one slave device to another slave device. A period of about 30 ms is required as a waiting period until command transmission.

For example, the control device 10 designates the ID address of the thermopile sensor 2 # 1 on the bus and transmits a command requesting the illuminance data detected by the illuminance sensor 2b (t2). Thermopile sensor 2 # 1 transmits a response including illuminance data detected by illuminance sensor 2b together with its own ID address to control device 10 (t3). The control device 10 designates the ID address of the thermopile sensor 2 # 2 on the bus and requests the illuminance data detected by the illuminance sensor 2b after the standby period after the completion of the response reception of the thermopile sensor 2 # 1. Is transmitted (t4). The thermopile sensor 2 # 2 transmits a response including the ID address of the thermopile sensor 2 # 2 and the detected illuminance data on the bus (t5).

  In the serial communication described above, the transmission interval of continuous commands to the same slave device is required to be about 300 msec or longer from the start of the previous command transmission to the start of the next command transmission.

  For example, when the illuminance data of the thermopile sensor 2 # 1 exceeds a predetermined threshold value, the control device 10 specifies the ID address of the thermopile sensor 2 # 1 after the interval period elapses, and the MEMS non-contact temperature sensor 2a A command for invalidating the human body detection is transmitted (t6). The thermopile sensor 2 # 1 sets the detection range 4 related to the human body detection of the MEMS non-contact temperature sensor 2a to be invalid, and responds with a response including information (for example, flag information) indicating that the human body detection is invalid (t7). ).

  In addition, for example, when the illuminance data of the thermopile sensor 2 # 1 is equal to or less than a predetermined threshold, the control device 10 within the detection range 4 detected via the MEMS non-contact temperature sensor 2a after the interval period has elapsed. A command for requesting human detection information is transmitted (t6). The request command is transmitted on the bus by designating the ID address of the thermopile sensor 2 # 1. The thermopile sensor 2 # 1 responds with a response including human detection information within the detection range 4 detected via the MEMS non-contact temperature sensor 2a (t7).

  FIG. 10 is an example of a response response when the thermopile sensor 2 is divided into 16 parts. As shown in the table Tb2 of FIG. 10, each thermopile sensor 2 constituting the human detection system 1 is detected for each subdivision region (FIG. 7, divided regions U1 to U16) of the detection range 4 divided into 16 parts. The presence / absence information such as is associated with the position of each bit constituting the word data and responds to the control device 10. In the table Tb2, the “bit” row represents the bit configuration of the word data, and the “area” row represents the divided area associated with the bit position. Similarly, the “output” line represents the flag value of presence (1) / absence (0) of a human body or the like in the divided area.

In the table Tb2 of FIG. 10, for example, the MSB (Most Significant Bit) constituting the word data corresponds to the divided region U16 shown in FIG. 7, and the LSB (Least Significant Bit) is shown in FIG. This corresponds to the divided area U1 shown in FIG. In the table Tb2 in FIG. 10, a human body or the like is detected in the divided areas U5, U6, U9, and U10 in the detection range 4 divided into 16 parts. The thermopile sensor 2 gives a flag value “1” to the bit position of the “output” row corresponding to each divided area in which a human body or the like is detected, and responds to the control device 10 as indicated by the hatched portion.

  When the thermopile sensor 2 has one or more thermopile elements, the detection of the human body or the like can be set to be permitted / not permitted for each of the divided areas of the subdivided detection range 4. is there. For example, the control device 10 transmits, to the thermopile sensor 2, a command for permitting / not permitting detection of a human body or the like for each subdivided divided region in association with the position of each bit constituting the word data.

FIG. 11 is a diagram illustrating a form in which detection of a human body or the like is permitted / not permitted for each divided region. FIG. 11 (1) is an example of a command for setting permission / non-permission for each divided region, which is transmitted from the control device 10 to the thermopile sensor 2 during 16 divisions. FIG. 11 (2) shows a thermopile sensor 2 when permission / non-permission is set for each divided region for detection of a human body or the like.
It is an example of the response response at the time of 16 division.

  As shown in the table Tb3 of FIG. 11 (1), the control device 10 configures word data together with a predetermined command to permit / deny detection of a human body or the like for each of the divided areas of the detection range 4 divided into 16 parts. The data is transmitted to the thermopile sensor 2 in association with the position of each bit. In the table Tb3, the “bit” row represents the bit configuration of the word data, and the “area” row represents the divided region associated with the bit position. The “bit” row and the “area” row in the table Tb3 are the same as those in the table Tb2. Similarly, the “output” row of the table Tb3 represents a flag value of permission (0) / non-permission (1) for detection of a human body or the like in the divided area.

  In the table Tb3 in FIG. 11 (1), disapproval of detection of a human body or the like is set for the divided areas U5 and U6 in the detection range 4 divided into 16 parts. The thermopile sensor 2 holds the word data, which is transmitted from the control device 10 and is designated for permission / non-permission for detection of a human body or the like for each divided region, in a predetermined region. And when the command which requests | requires the person detection information in the detection range 4 is transmitted from the control apparatus 10, the thermopile sensor 2 responds with a response in the form shown in FIG. 11 (2).

  The table Tb4 shown in FIG. 11 (2) has the same configuration as the table Tb2 showing the response response when the thermopile sensor 2 is divided into 16 parts as described in FIG. However, the thermopile sensor 2 forcibly sets the bit value “for the divided areas U5 and U6 in which disapproval (flag value“ 1 ”in the output row in FIG. 11 (1)) is set for detection of a human body or the like. A response is returned in the state set to “0”.

  For example, in the thermopile sensor 2, it is assumed that a human body or the like is detected in the divided areas U5, U6, U9, and U10 in the detection range 4 divided into 16 parts. The thermopile sensor 2 inserts “0” into the bit values corresponding to the divided areas U5 and U6 for which disapproval is specified, and the divided areas U9 and U10 that are in a permitted state for detecting a human body or the like are shown in FIG. 11 (2), a bit value “1” is inserted and a response is returned.

(Case 1)
Returning to the explanatory diagram illustrated in FIG. 7, in the human detection system 1, the control device 10, for example, in order of the thermopile sensor 2 # 1 to the thermopile sensor 2 # 16 connected on the bus, respectively, via the illuminance sensor 2 b. To obtain the detected illuminance data. Illuminance data corresponding to each of the region B1 to the region B8 and the region C1 to the region C8 in FIG. 7 is acquired by the control device 10 from the thermopile sensor 2 # 1 via the thermopile sensor 2 # 16.

  Based on the illuminance data acquired from each thermopile sensor 2, the control device 10 of the human detection system 1 sets validity / invalidity of human body detection by solar radiation for the areas B1 to B8 and the areas C1 to C8. The control device 10 detects the human body in the above area on condition that the illuminance data of the areas C1, C2, C3, C4, C5, and C7, which are indoor areas where the window side solar radiation is shined, exceeds a predetermined threshold value. Disable it. The invalidation of human body detection is set for each detection range 4. A command for invalidating the human body detection of the MEMS non-contact temperature sensor 2a is transmitted to each thermopile sensor 2 corresponding to the region. Note that, for each of the regions other than the regions C1, C2, C3, C4, C5, and C7, a command for enabling human body detection of the MEMS non-contact temperature sensor 2a is transmitted.

However, the thermopile sensor 2 can acquire illuminance data even when the human body detection of the MEMS non-contact temperature sensor 2a is invalidated. The control device 10 of the human detection system 1 periodically acquires illuminance data from each thermopile sensor 2 in which human body detection is disabled, for example, human body detection based on illuminance data in an indoor area where solar radiation shines in time units. Enable / Disable can be set. In the human detection system 1, it is possible to enable human body detection again in response to a change in illuminance in an indoor area in which solar radiation shines once in the detection range 4 in which human body detection is disabled.

  Further, the control device 10 may invalidate human body detection for each divided region of the thermopile sensor 2. For example, it is assumed that the human detection system 1 can acquire illuminance data for each of the four divided regions illustrated in FIG. 5A via a plurality of illuminance sensors. If the acquired illuminance data exceeds a predetermined threshold, the control device 10 designates the divided areas U1 to U16 existing in the four divided areas and sets each human body detection to permitted / not permitted. Good.

  In FIG. 7, the illuminance data corresponding to the divided areas U9, U10, U13, U14 of the area C1 exceeds a predetermined threshold, and the illuminance data corresponding to the divided areas U11, U12, U15, U16 of the area C1 is predetermined. Assume that the threshold is exceeded. For example, the control device 10 can specify the divided areas U1 to U8 of the area C1 to permit human body detection, and can specify the divided areas U9 to U16 of the area C1 to disable human body detection. The control apparatus 10 can improve the setting accuracy of the validity / invalidity of the human body detection based on the illuminance data by setting the permission / non-permission of the human body detection for each divided region.

(Case 2)
When the control device 10 sets the invalidation of the human body detection of the target region based on the illuminance data, the control device 10 invalidates based on the time series information of the human body detection position detected in the adjacent region adjacent to the target region. Estimate the entrance and exit of the human body etc. to the target area.

  In the human detection system 1 of FIG. 7, the control device 10 invalidates the human body detection in the areas C1, C2, C3, C4, C5, and C7 based on the illuminance data for each thermopile sensor 2 detected by the illuminance sensor 2b. Assuming that For example, the control device 10 determines an adjacent region adjacent to each region where the human body detection is invalidated from the correspondence relationship between the arrangement position of each thermopile sensor 2 arranged in the room and the ID address of each thermopile sensor 2. Identify.

  For example, in FIG. 7, the thermopile sensor 2 # 1 in which the region B1 is the detection range 4 is specified with respect to the region C1. Similarly, the thermopile sensor 2 # 2 in the region B2 adjacent to the region C2, the thermopile sensor 2 # 3 in the region B3 adjacent to the region C3, and the thermopile sensor 2 # 4 in the region B4 adjacent to the region C4 are specified. Further, as the thermopile sensor 2 adjacent to the region C5, the thermopile sensor 2 # 5 in the region B5 and the thermopile sensor 2 # 14 in the region C6 are specified. Further, as the thermopile sensor 2 adjacent to the region C7, the thermopile sensor 2 # 14 in the region C6, the thermopile sensor 2 # 7 in the region B7, and the thermopile sensor 2 # 16 in the region C8 are specified.

  The control device 10 acquires human detection information for each adjacent region adjacent to each invalidated region at a predetermined cycle interval. When the detection range 4 of the thermopile sensor 2 is subdivided according to the number of thermopile elements, the control device 10 acquires information such as the presence / absence of a human body detected for each subdivided divided region. . As described with reference to FIG. 10 and the like, the information such as the presence / absence of the human body detected for each divided region is the flag value (present (1)) associated with the position of each bit constituting the word data. / Absent (0)).

For example, regarding the region C7 in which the human body detection is disabled, the presence of the human body detected in the divided regions U1 of the region C6, the divided regions U13 and U14 of the region B7, and the divided regions U5 and U13 of the region C8 (flag value “ 1 ") is acquired. The control device 10 stores the information such as the presence / absence of the human body for each adjacent area acquired at a predetermined cycle interval in association with, for example, the identification number of the divided area and the time information when the information is acquired. The data is stored in a predetermined area such as the device 12. Similar processing is performed for the regions C1 to C5.

  For example, the control device 10 repeats the above process every time the human detection information is acquired, and accumulates information such as the presence / absence of the human body for each adjacent region sampled at a predetermined cycle interval in the main storage device 12 or the like. And the control apparatus 10 estimates entrance / exit of the human body etc. to each invalidated area | region based on the said information accumulate | stored in the main memory device 12 grade | etc.,.

  For example, the control device 10 compares information on the presence / absence of a human body or the like that moves back and forth on a time series for each adjacent region, and identifies a change in the detected state of the human body from “present” to “absent”. The change in the detection state of the human body or the like is specified for each divided region. For example, as shown in FIG. 7, among the regions adjacent to the invalidated region C7, the divided regions U13 and U14 of the region B7 and the divided regions U5 and U13 of the region C8 are at the boundary with the region C7. It touches.

  For example, when the detection state of the human body or the like in the divided region U13 of the region C8, which changes around the time series sampled at a predetermined cycle interval, changes from “present” to “absent”, the control device 10 It is estimated that the human body or the like detected in the state has moved to the invalidated region C7 across the boundary. Since the control device 10 can estimate the person's entry and exit into the invalidated area in units of divided areas, it can improve the estimation accuracy.

  Here, the control device 10 invalidates the decrease in the number of people in the detection range 4 when the detection state of the human body or the like in the divided region U13 of the region C8 changes from “present” to “absent”. It may be added to the estimation condition for movement to C7. When the presence / absence of a human body or the like is detected for each divided area, the control device 10, for example, indicates a flag value “1” indicating the “present” state in the word data from the thermopile sensor 2 # 16 corresponding to the area C8. The number of people in the detection range 4 can be specified by counting the quantity of “”. Alternatively, the control device 10 may acquire the number of persons information in the detection range 4 from the thermopile sensor 2 # 16 corresponding to the area C8 together with the human body detection information for each divided area in the detection range 4.

  Further, the control device 10 detects the detection range 4 of each thermopile sensor 2 arranged indoors from the above information stored in the main storage device 12 and the like, and the divided areas in which the human body is detected in each detection range 4 It is also possible to generate map information in which From the map information, the detection position of a human body or the like within the detection range 4 can be specified.

  Then, the control device 10 manages the number of persons detected in each detection range 4 in association with the map information for each thermopile sensor 2 arranged in the room. The detection position of the human body or the like is specified.

  The control device 10 estimates the change in the number of people in the detection range 4 for each thermopile sensor 2 and the change in the detection position of the human body, etc., specified by the map information, when estimating the movement to the invalidated area. It may be added to.

  Similarly, the control device 10 compares the presence / absence information of the human body and the like on the time series for each adjacent region, and based on the change in the detection state of the human body from “absent” to “present”. Thus, the movement of the human body or the like from the invalidated area can be estimated.

For example, when the detection state of the human body or the like in the divided region U13 of the region C8 that changes around the time series sampled at a predetermined cycle interval changes from “absent” to “present”, the control device 10 It is estimated that the human body or the like detected in the state has moved from the invalidated area C7 to the area C8 across the boundary.

  In the above estimation, it may be conditioned that the movement to the invalidated region C7 is estimated at least within a predetermined period from the estimation time point. The estimation of the movement from the invalidated area C7 may be limited to a change from “absent” to “present” of the detection state of the human body or the like in the divided area in contact with the boundary of the area C7.

  For example, the divided areas in contact with the boundary of the area C7 in FIG. 7 are divided areas U16 of the area B6, divided areas U13 to U16 of the area B7, divided areas U13 of the area B8, divided areas U4, U8, U12, U16 of the area C6. The divided areas U1, U5, U9, U13 of the area C8 are exemplified. Such indoor arrangement relationship may be set in advance according to the size of the detection range 4 of the thermopile sensor 2, the moving speed of the detection target, the sampling cycle, and the like.

  Changes such as the presence / absence of a human body or the like for each divided region accumulated in the main storage device 12 or the like of the control device 10 can be represented as a time-series trajectory within the detection range 4. . For example, in FIG. 7, when the human body detected in the divided region U7 of the region B5 moves from the divided region U7 to U15 via U11 over time, the human body detection state in the detection range 4 is divided. Expressed as a trajectory on the region.

  For example, the control device 10 specifies a trajectory on the divided region in the detection range 4 based on a change in the presence / absence of the human body or the like for each divided region accumulated in the main storage device 12 or the like at predetermined cycle intervals. . Then, the control device 10 changes from the “presence” to the “absence” of the detection state that moves back and forth in the time series of the transition direction of the specified trajectory and the divided region in contact with the boundary with the invalidated region. The movement of the human body or the like to the invalidated area may be estimated based on the change.

  For example, it is assumed that the “present” state indicating the detection of a human body or the like in the region B5 in FIG. 7 transitions from the divided regions U7 → U11 → U15 with the passage of time. The control device 10 specifies the transition direction (for example, the downward direction from the divided region U7) from the locus in the detection range 4 of the “present” state with time. Then, when the detection state of the divided area U15 that is in contact with the boundary with the invalidated area C5 changes from “present” to “absent”, the control device 10 enters the invalidated area C5. Estimate the movement of the human body. In the control device 10, the entry / exit to the invalidated area is estimated from the dynamic change on the time axis of the human detection information detected by the thermopile sensor 2 provided in the adjacent area adjacent to the invalidated area. it can.

  In addition, the above estimation process can apply the area | region where the thermopile sensor 2 is not arrange | positioned indoors as an object area | region. The control device 10 may hold at least map information indicating the arrangement position of the thermopile sensor 2 in the room in the auxiliary storage device 13 in advance. Based on the map information, the position where the thermopile sensor 2 is disposed, and the detection range 4 of the thermopile sensor 2, the control device 10 can identify an area where the thermopile sensor 2 is not disposed.

  Further, the control device 10 sets a region in the room where the thermopile sensor 2 is not disposed based on the map information or the like as a target region, for example, a region of the detection range 4 adjacent to the target region and a boundary between the target region Can be specified. For example, the control device 10 can estimate the entry / exit of the human body and the like into the target region from the change in the detection state of the human body and the like with the passage of time in the divided region in contact with the boundary with the specified target region. .

For the target area in which the human body or the like has been estimated by the control device 10, for example, a flag value indicating an estimated value for the “present” / “absent” information indicating the detection state of the human body etc. Assigned to manage the detection status. For example, when the control device 10 outputs information indicating the detection state of the human body or the like in the target area to the control system combined with the human detection system 1, the control device 10 indicates “present” / “not present” indicating the estimated detection state. And a flag value (for example, “1”) indicating an estimated value. Based on the flag information, the control system can identify that the output human body detection information is in the estimated state.

(Case 3)
The control device 10 groups the divided areas that do not detect the human body or the like for a certain period within the detection range 4 based on the above information stored at the predetermined periodic intervals accumulated in the main storage device 12 and the like, and identifies them as non-detection areas can do. The control device 10 specifies the non-detection region for each detection range 4 of each thermopile sensor 2 and holds the specified non-detection region in the auxiliary storage device 13 or the like as management information.

  The control device 10 reflects the above-mentioned non-detection region when the human body detection invalidation region described in (Case 2) or the estimation of the entrance / exit of the human body to the target region such as the non-installation region of the thermopile sensor 2 is performed. By doing so, it becomes possible to reduce the processing load. For example, the control device 10 refers to the non-detection region held as management information in the auxiliary storage device 13 or the like, and excludes the non-detection region from the detection range 4 of each thermopile sensor 2 adjacent to the target region. In the detection range 4 from which the non-detection area is excluded, the divided areas for monitoring the change in the detection state of the human body and the like with the passage of time are limited. For this reason, in the control apparatus 10, the reduction of the processing load at the time of estimating the entrance / exit of the human body etc. with respect to a target area | region can be anticipated.

<4. Flow of processing>
Next, detection processing according to the present embodiment will be described with reference to FIGS. 12 and 13. FIG. 12 is a flowchart illustrating an example of a human body detection valid / invalid setting process of the thermopile sensor 2 by solar radiation. For example, the control device 10 according to the present embodiment provides the processing illustrated in FIGS. 12 and 13 by the CPU 11 and the like reading and executing various programs and various data stored in the auxiliary storage device 13.

  In the flowchart of FIG. 12, the start of the process is exemplified when the illuminance data is requested to one or more thermopile sensors 2 after the completion of activation arranged on the indoor ceiling or the like. The control device 10 designates an ID address assigned to each thermopile sensor 2 connected to the communication bus after activation and transmits a command for requesting illuminance data detected by the illuminance sensor 2b. To do. As described with reference to FIGS. 7 to 11, the control device 10 receives a response corresponding to the command from each thermopile sensor 2 connected on the communication bus and is detected by the illuminance sensor 2b included in each response. Illuminance data corresponding to the detected range 4 is acquired (S1).

  The illuminance data corresponding to the detection range 4 of each thermopile sensor 2 may be acquired from, for example, an illuminance sensor included in a control system combined with the human detection system 1. The control device 10 temporarily stores the acquired illuminance data in a predetermined area of the main storage device 12 in association with the ID address of the thermopile sensor 2.

  The control device 10 invalidates the detection range 4 for each thermopile sensor 2 for which the illuminance data acquired in the process of S1 exceeds a predetermined threshold, and for each thermopile sensor 2 for which the illuminance data exceeds a predetermined threshold. Then, the detection range 4 is set to be invalid (S2). The valid / invalid setting of the detection range 4 is performed, for example, by transmitting a command for invalidating the human body detection of the MEMS non-contact temperature sensor 2a specifying the ID address to each thermopile sensor 2 connected on the communication bus. Done.

The control device 10 stores the ID address of each thermopile sensor 2 in which the detection range 4 is set to invalid in the process of S2 and the ID address of each thermopile sensor 2 in which the detection range 4 is set to be valid together with the time information. Is temporarily stored in the area (S3). In addition, the information memorize | stored by the process of S3 is updated based on the illumination intensity data corresponding to the detection range 4 of each thermopile sensor 2 acquired by the predetermined | prescribed period interval. The control device 10 ends the process of FIG. 12 after the process of S3.

  With the above processing, in the control device 10 according to the present embodiment, one or more thermopile sensors 2 connected on the communication bus are provided on condition that a predetermined threshold value of illuminance data corresponding to the detection range 4 is exceeded. It is possible to invalidate detection of human bodies and the like. The human detection system 1 including the control device 10 according to the present embodiment has a human body by the thermopile sensor 2 according to the illuminance change of the illuminance data detected through the illuminance sensor 2b even if there is a range in which the solar radiation shines. You can enable / disable detection. In the human detection system 1 according to the present embodiment, it is possible to detect a human body via the thermopile sensor 2 under conditions where the solar radiation does not shine into the room such as rainy weather, cloudy weather, and nighttime.

  FIG. 13 is a flowchart illustrating an example of a human body estimation process for an area where human body detection is disabled. In the flowchart of FIG. 13, the start of the process is exemplified when the human body detection is set to be valid / invalid for each of the one or more thermopile sensors 2 arranged on the ceiling or the like in the room.

  The control device 10 specifies an effective detection range that enables human body detection adjacent to the detection range 4 of each disabled thermopile sensor 2 (S11). As described with reference to FIG. 7 and the like, for example, the controller 10 invalidates the human body detection based on the correspondence between the arrangement position of each thermopile sensor 2 arranged indoors and the ID address of each thermopile sensor 2. An adjacent area adjacent to each target area is identified. The correspondence relationship between the arrangement position of each thermopile sensor 2 arranged in the room and the ID address of each thermopile sensor 2 is stored in advance in the auxiliary storage device 13, for example.

  The control device 10 acquires the human detection information detected at a predetermined cycle interval for the effective detection range specified in the process of S1, and the identification number of the divided area where the time information and the human body are detected in the acquired human detection information Are stored in a predetermined area of the main storage device 12 (S12). The human detection information includes “present” / “absent” such as a human body for each divided region, the number of persons in the activated detection range 4, and the like. Further, the position of a human body or the like in the detection range 4 is specified by the positional relationship between each divided region and the detection range 4. The change in the number of people in the detection range 4 accumulated at a predetermined cycle interval becomes a time-series transition.

  When the human detection information on the time series of the adjacent effective detection ranges accumulated in the process of S12 satisfies the predetermined estimation condition, the control device 10 estimates the movement to the invalidated detection range (S13). The entry / exit of the human body etc. with respect to the invalidated detection range has been described with reference to FIG.

  The control device 10 gives information (for example, a flag value) for distinguishing the movement target estimated in the process of S13, and outputs human body detection information in the invalidated detection range (S14). For the control system combined with the human detection system 1, it indicates an estimated value together with “present” / “absent” information for each divided region indicating the estimated detection state in the invalidated detection range. A flag value (for example, “1”) is output. The control device 10 ends the process of FIG. 13 after the process of S14.

In addition, the control apparatus 10 can apply the process illustrated in FIG. 13 to an indoor area where the thermopile sensor 2 is not disposed as a target area. The control device 10 stores at least map information indicating the arrangement position of the thermopile sensor 2 in the room in advance in the auxiliary storage device 13.
You just hold it. Based on the map information, the arrangement position of the thermopile sensor 2, and the detection range 4 of the thermopile sensor 2, the control device 10 can identify a target region where the indoor thermopile sensor 2 is not arranged. Moreover, the control apparatus 10 can specify the area | region of the detection range 4 adjacent to an object area | region, and the division area | region which touches the boundary between object areas based on map information etc. For example, the control device 10 can estimate the entry / exit of the human body and the like into the target region from the change in the detection state of the human body and the like with the passage of time in the divided region in contact with the boundary with the specified target region.

  Through the above processing, in the control device 10 according to the present embodiment, human body detection detected within the detection range 4 that has been invalidated or the detection range of another thermopile sensor 2 adjacent to the non-installation region of the thermopile sensor 2. Based on the information, it is possible to estimate the entry / exit of a human body or the like to the invalidated detection range 4 or the non-installation region of the thermopile sensor 2. In the human detection system 1 according to the present embodiment, the human detection accuracy based on the human body detection information detected within the detection range of another adjacent thermopile sensor 2 is present even when there is a range in which solar radiation shines in the room. Improvement is possible.

Note that the control device 10 specifies, from the accumulated data, a detection range 4 in which a human body or the like is not detected continuously for a predetermined period, or a divided area in the detection range 4 when estimating the entry or exit of a human body or the like. , May be excluded. The human detection system 1 according to the present embodiment excludes a detection range 4 in which a human body or the like is not detected continuously for a predetermined period, or a detection range that has been invalidated by excluding divided areas within the detection range 4, or In addition, it is possible to improve the estimation accuracy of the human body and the like entering and leaving the non-installation area of the thermopile sensor 2 and reduce the processing load related to the estimation.
Further, the control device 10 stores, for example, architectural space information of a factory, a school, or a company office to which the human detection system 1 is applied in the auxiliary storage device 13, and specifies a non-detection area based on the architectural space information. It is good. The architectural space information includes, for example, arrangement positions of furniture such as walls, passages, doors, desks and racks. The control apparatus 10 can improve the estimation accuracy of the entrance and exit of the human body and the like by using the architectural space information.
Furthermore, the control device 10 learns the transition of the non-detection area held in the auxiliary storage device 13 or the like, and sets the non-detection area where the human body or the like is not detected continuously for a predetermined period (for example, one month) as a wall. It may be estimated in the arrangement area of equipment such as a pole, a desk, a rack, and the like. And the control apparatus 10 may produce | generate building space information, such as a factory, a school, a company office, etc. to which the human detection system 1 is applied from the estimated arrangement | positioning area | region. Even when architectural space information such as factories, schools, and offices to which the human detection system 1 is applied cannot be obtained in advance, by using the generated architectural space information, the estimated accuracy of entering and exiting the human body, etc. Can be expected to be further enhanced. According to the present embodiment, a technique that can improve the accuracy of a human detection system using a thermopile sensor is provided.

  It should be noted that the above-described embodiment can be implemented with appropriate modifications within a range not departing from the gist of the present disclosure. The human detection system 1 according to the present embodiment constitutes a part of a control system that controls a living environment according to the presence / absence of a human body or the like in a room such as a factory, a school, a company office, or a house, and a position distribution. Also good. Examples of the control system that controls such a living environment include an air conditioning control system and a lighting control system. Also, a part of a service system that provides various services such as monitoring and monitoring of a human body occupying an elderly facility, etc., using information such as the presence / absence of the human body and the position distribution detected by the human detection system 1 May be configured.

1 Person detection system 2 Thermopile sensor 2a MEMS non-contact temperature sensor 2b Illuminance sensor 2c, 2d Display LED
2e MCU
2f Power IF
2g Communication IF
2h I / O IF
2i Mounting spring 3 Ceiling 4 Detection range 5 Floor 10 Controller 11 CPU
12 Main storage device 13 Auxiliary storage device 14 Communication IF
15 I / O IF
16 Connection bus

Claims (8)

One or more infrared sensors that detect the amount of infrared rays emitted from the object in the detection region using the thermoelectric effect;
An illuminance sensor for detecting the illuminance in the detection area;
A control device connected to the one or more infrared sensors and the illuminance sensor,
The control device includes:
The illuminance in the detection area of the one or more infrared sensors is acquired, and the target by the infrared sensor associated with the detection area in which the acquired illuminance exceeds a predetermined threshold among the one or more infrared sensors Disabling means for disabling body detection,
A human detection system comprising: The control device includes:
Among the one or more infrared sensors, from a detection area of the infrared sensor in which the detection of the object is effective, a specifying unit that specifies a first adjacent detection area adjacent to the invalidated detection area;
The detection information including at least one of the number of the objects detected in the first adjacent detection area and the distribution of the objects in the first adjacent detection area is acquired at a predetermined period, and the first Storage means for storing the detection information acquired from one adjacent detection region in association with time information;
Estimating means for estimating the entry / exit of the object with respect to the invalidated detection area from the accumulated time series of the detection information;
The human detection system according to claim 1, further comprising: The detection information includes the presence / absence of the object for each of a plurality of divided areas obtained by equally dividing the detection area,
The specifying unit specifies a divided region in contact with a boundary between the invalidated detection region in the first adjacent detection region,
The estimation means estimates the entry / exit of the object with respect to the invalidated detection area from a change in the presence / absence of the object in the identified divided area in the time series of the detection information. The human detection system according to claim 2, wherein   The estimation means specifies a non-detection region in which the target object is not detected for a certain period in the first adjacent detection region from the time series of the stored detection information, and the stored detection information From the change in the presence or absence of the target object in the first adjacent detection area excluding the specified non-detection area in the time series of, to estimate the entry and exit of the target object with respect to the invalidated detection area, The human detection system according to claim 2.   The said estimation means specifies the said non-detection area | region based on the architectural space information containing the position information of the wall in the said detection area | region, a door, furniture, a passage, and equipment. The described human detection system. The specifying means is adjacent to the non-installation area from the detection area of the one or more infrared sensors based on map information including an installation position of the one or more infrared sensors and a non-installation area of the one or more infrared sensors. Identify the second adjacent detection area to be
The estimation means estimates the entry / exit of the object with respect to the non-installation area from a change in presence / absence of the object in the identified second adjacent detection area in the time series of the accumulated detection information, The human detection system according to claim 2. The control device includes:
When the estimation means estimates the entry / exit of the object with respect to the invalidated detection area, information indicating that the object within the invalidated detection area is estimated is added. The human detection system according to any one of claims 2 to 5, further comprising output means for outputting. One or more infrared sensors for detecting the amount of infrared rays emitted from the object in the detection area using a thermoelectric effect; an illuminance sensor for detecting illuminance in the detection area; the one or more infrared sensors and the illuminance sensor; In a human detection system having a control device to be connected,
The control device is
The illuminance in the detection area of the one or more infrared sensors is acquired, and the target by the infrared sensor associated with the detection area in which the acquired illuminance exceeds a predetermined threshold among the one or more infrared sensors An invalidation step for disabling body detection,
The person detection method characterized by performing.

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