JP7017687B2 - Human detection system and human detection method - Google Patents

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 radiated from an object such as a human body has been known. Examples of such an infrared sensor include a pyroelectric type infrared sensor and a thermopile (thermopile) type infrared sensor (hereinafter, also referred to as “thermopile sensor”). The former is a sensor that detects changes in the amount of infrared rays radiated from an object using, for example, the pyroelectric effect that occurs in a pyroelectric body (pyroelectric element) made of a ferroelectric substance or ceramic. be. The latter is a sensor that detects the amount of infrared rays radiated from an object by using the Seebeck effect, which generates thermoelectromotive force according to the 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, it can detect the entry and exit of a human body or the like into the detection target area. On the other hand, when the human body or the like is stationary in the detection target area, the detected infrared ray amount does not change from a constant state, which makes it difficult to detect the human body or the like. However, since the thermopile sensor can directly detect the amount of infrared rays radiated from the human body or the like as electrical energy (thermoelectromotive force), it is possible to 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 is possible to measure the temperature of the object existing in the detection target area, and to grasp the presence / absence and bias (distribution) of the object. For example, by combining one or more thermopile sensors to form a human detection system and combining the human detection system with air conditioning equipment and lighting equipment, the presence / absence of a human body and the indoor position in a room such as an office or a house can be obtained. , Air conditioning control and lighting control according to the position distribution become possible. In addition, by grasping the temporal position change (dynamic transition) of the object detected by one or more thermopile sensors, for example, it becomes possible to monitor and monitor the human body in an area where privacy protection is required. ..

The following patent documents exist as prior art documents that describe the techniques related to the techniques described in the present specification.

Japanese Unexamined Patent Publication No. 2013-93103

As described above, the thermopile type infrared sensor detects the amount of infrared rays radiated from the object as electric energy. Therefore, for example, when the temperature of an object (for example, a floor surface, a wall surface, a desk, etc.) in the detection target area of the thermopile type infrared sensor provided in a room such as an office or a house rises due to sunlight or the like, the temperature rises. There is a possibility that the raised object will be falsely detected as a human body.

When configuring a human detection system, in order to prevent the above false detection, for example, the range where the solar radiation shines on the window side in the room 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, it does not improve the detection accuracy of the human detection system that detects the human body or the like existing in the room. In order to improve the detection accuracy of the human detection system, it is preferable that the thermopile sensor can be used to detect the human body even if there is a range of sunlight in the room.

The present invention has been made in consideration of the above problems, and an object of the present invention is to provide a technique capable of improving 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 emitted by the object in the detection area by using the thermoelectric effect, an illuminance sensor that detects the illuminance in the detection area, and the one or more. It has an infrared sensor and a control device connected to the illuminance sensor, and the control device acquires the illuminance in the detection region of the one or more infrared sensors, and among the one or more infrared sensors, the said. It is characterized by comprising an invalidation 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 this configuration, even if there is a range where sunlight shines in the room, it is possible to enable / disable human body detection in the detection area by the infrared sensor according to the illuminance change of the illuminance data detected through the illuminance sensor. Can be set. Even if there is a range of sunlight in the room, it is possible to detect the human body using an infrared sensor.

Further, in the present invention, in the one or more infrared sensors, the control device is first adjacent to the invalidated detection area from the detection area of the infrared sensor for which the detection of the object is effective. Detection information including at least one of a specific means for specifying a detection region, the number of the target bodies detected in the first adjacent detection region, and the distribution of the target body in the first adjacent detection region is predetermined. The storage means for accumulating the detection information acquired from the first adjacent detection area in association with the time information, and the invalidated detection area from the time series of the accumulated detection information. It may be further provided with an estimation means for estimating the entry / exit of the object with respect to the object.

According to such a configuration, it is possible to estimate the entry and exit of the human body or the like into 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 if there is a range of sunlight shining in the room, it is possible to improve the human detection accuracy based on the human body detection information detected in the detection area of another adjacent infrared sensor.

Further, in the present invention, the detection information includes the presence / absence of the target body for each of a plurality of divided regions in which the detection region is evenly divided, and the specific means is invalidated in the first adjacent detection region. The divided region tangent to the boundary between the detected region and the detected region is specified, and the estimation means invalidates the object from the change in the presence or absence of the object in the specified divided region in the time series of the detection information. The entry and exit of the object to the detected detection area may be estimated. According to such a configuration, it is possible to improve the human detection accuracy based on the human body detection information detected in the divided region tangent to the boundary with the invalidated detection region.

Further, in the present invention, the estimation means identifies a non-detection region in which the target body is not detected for a certain period of time within the first adjacent detection region from the time series of the accumulated detection information, and also specifies the non-detection region. From the change in the presence or absence of the target body in the first adjacent detection region excluding the specified non-detection region in the time series of the accumulated detection information, the target with respect to the invalidated detection region. You may try to estimate the comings and goings of the body. According to such a configuration, it is possible to improve the estimation accuracy of the entry and exit of the human body or the like into the invalidated detection area and reduce the processing load related to the estimation.

Further, in the present invention, the estimation means identifies the non-detection area based on the building space information including the position information of at least one of the wall, the door, the furniture, the passage, and the equipment in the detection area. May be good. According to such a configuration, the estimated degree of purification of the entry and exit of the human body or the like into the invalidated detection region can be further increased, and the processing load can be reduced.

Further, in the present invention, the specific means has the detection area of the one or more infrared sensors based on the map information including the installation position of the one or more infrared sensors and the non-installation area of the one or more infrared sensors. The second adjacent detection area adjacent to the non-installed area is specified from the above, and the estimation means has the presence or absence of the object in the specified second adjacent detection area in the time series of the accumulated detection information. The entrance and exit of the object to the non-installed area may be estimated from the change of. According to such a configuration, it is possible to estimate the entry and exit of the human body or the like into the non-installed area based on the human body detection information detected in the detection area of another infrared sensor adjacent to the non-installed area.

Further, in the present invention, in the control device, when the entry / exit of the object to the invalidated detection area is estimated by the estimation means, the object in the invalidated detection area is estimated. It may be further provided with an output means for adding and outputting information indicating that the invention is used. According to such a configuration, it is possible to identify that the human body detection information in the invalidated detection area or the non-installed area of the infrared sensor is in the estimated state.

Further, the present invention includes one or more infrared sensors that detect the amount of infrared rays emitted by an object in the detection region by using a thermoelectric effect, an illuminance sensor that detects the illuminance in 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 region of the one or more infrared sensors is acquired, and the acquired illuminance is obtained in the one or more infrared sensors. The person detection method may be characterized in that an invalidation step for invalidating the detection of the object by the infrared sensor associated with the detection region exceeding a predetermined threshold is executed.

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 carried out as long as there is no technical contradiction.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a technique capable of improving the accuracy of a human detection system using a thermopile sensor.

It is a figure which shows an example of the block composition of the thermopile sensor which concerns on embodiment. It is a perspective view which looked at the form housed in the cylindrical housing of the thermopile sensor which concerns on embodiment from the floor surface side. It is a figure explaining the detection range of the human body and the like 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 subdivided division area of a detection range. It is a figure which shows an example of the structure of the person detection system which concerns on embodiment. It is a figure explaining the human body detection process in the room where there is a range that sunlight shines. It is a figure which shows an example of the multi-drop configuration 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 the thermopile sensor at the time of 16 divisions. It is a figure explaining the form of permitting / disallowing the detection of a human body etc. for each division area. 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, the person detection system according to the embodiment will be described with reference to the drawings. The configuration of the following embodiment is an example, and the identity detection system is not limited to the configuration of the embodiment.

<1. Thermopile sensor ＞
First, a thermopile sensor constituting the human detection system according to the present embodiment will be described.
(Block configuration)
FIG. 1 is a diagram showing 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 area. 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. Further, 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 the like.
Includes indicator LEDs (2c, 2d).

The MEMS non-contact temperature sensor 2a is an infrared array sensor in which a plurality of thermopile elements (thermocouple rows), which are MEMS devices, are arranged. The 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 the contacts of two kinds of metals (for example, bismuth and antimony).

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 the collected infrared rays are collected as a thermal contact of the thermopile element (a thermopile element). The hot junction) is concentrated and absorbed by the contacted heat-sensitive part. The MEMS non-contact temperature sensor 2a is targeted via a thermoelectromotive force according to the temperature difference between the cold junction of the thermopile element and the hot junction in contact with a portion inside the sensor where the temperature is unlikely to fluctuate. Measure the temperature of an object. The temperature measured by the MEMS non-contact temperature sensor 2a is output to the MCU 2e.

The illuminance sensor 2b is a photodetector device such as a photodiode or a phototransistor. The illuminance sensor 2b detects the illuminance in the detection target region 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 the thermopile sensor 2 is energized and communication is possible with other devices via the communication IF 2g. The display LED 2c is always lit when the thermopile sensor 2 satisfies the above state. Further, the display LED 2d is turned on (for example, lit in yellow) when a human body or the like is detected in the detection target area of the thermopile sensor 2, and is turned off when the 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 MCU2e controls peripheral devices by reading and executing programs and various data stored in a ROM or the like, and provides a function of a thermopile sensor 2 that meets a predetermined purpose.

The power supply IF2f is a power supply interface for driving the thermopile sensor 2. The power supply IF2f generates, for example, DC power for various devices constituting the thermopile sensor 2 from DC power supplied through a connection terminal (not shown), and supplies the generated DC power to various devices.

The communication IF 2g is a communication interface with another device (including another thermopile sensor 2) connected to the thermopile sensor 2. As a communication standard that can be used by the thermopile sensor 2, serial communication of RS-485 standard is exemplified. The input / output IF2h is an input / output interface with a setting switch, an output terminal, or the like of the thermopile sensor 2.

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

As shown in FIG. 2, an opening hole for a MEMS non-contact temperature sensor 2a, an illuminance sensor 2b, and display LEDs 2c and 2d is provided on a housing surface facing the floor surface of the thermopile sensor 2. The opening hole for the MEMS non-contact temperature sensor 2a is provided in the coarse center portion of the housing surface. Further, the opening holes of the illuminance sensor 2b and the display LEDs 2c and 2d are provided so as to be linearly aligned at positions relatively distant from the coarse center portion of the housing surface.

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

A pair of mounting springs 2i are provided on the side surface of the cylindrical housing of the thermopile sensor 2 in the radial direction. The housing of the thermopile sensor 2 is installed, for example, by embedding the housing surface provided with the opening holes in the mounting holes provided in the ceiling panel or the like constituting the ceiling so as to face the floor surface. The mounting spring 2i provided in the radial direction urges the wall surface of the mounting hole in which the cylindrical housing is embedded, and fixes the housing of the thermopile sensor 2 mounted on the ceiling panel or the like.

(Detection target area)
FIG. 3 is a diagram illustrating a detection target area such as a human body of the thermopile sensor 2. The detection target area (detection range) shown in FIG. 3 is an example of the detection range when the thermopile sensor 2 is installed on the ceiling of a room such as an office or a house. In FIG. 3, the 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 where the thermopile sensor 2 is installed is 2.7 m to 3 m, the rectangular detection range 4 is the housing surface provided with an opening hole such as the MEMS non-contact temperature sensor 2a. It is defined at a height of about 2 m from. The rectangular detection range 4 of the thermopile sensor 2 has an area range of about 3.6 m × 3.6 m centered directly under the opening hole of the MEMS non-contact temperature sensor 2a, for example.

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 present in the detection range 4, for example, on the condition that the temperature of the human body to be detected is within the range of 16 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 moving at a speed of 0.3 m / s to 1 m / s within the detection range 4.

Further, the thermopile sensor 2 measures the temperature of the object based on the infrared rays radiated from the object such as the human body existing in the rectangular detection range 4. FIG. 4 shows an example of the detected temperature characteristics of the thermopile sensor 2.

In FIG. 4, the vertical axis represents the temperature inside the sensor (reference temperature (° C.)) to which the cold contact of the thermopile element constituting the MEMS non-contact temperature sensor 2a is contacted, and the horizontal axis represents the temperature of the object to be measured (reference temperature (° C.)). Indicates the object temperature (° C)). Further, 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 range 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 the 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 directly under the sensor to which the thermopile sensor 2 is attached. The illuminance sensor 2b detects, for example, the illuminance of the floor surface 5 directly under the sensor within a detection range of 10 lux to 2000 lux (detection accuracy: ± 5% FS). Further, the illuminance detected by the illuminance sensor 2b may be an average value within the detection range 4.

As described above, the MEMS non-contact temperature sensor 2a of the thermopile sensor 2 is composed of one or more thermopile elements (thermocouple trains). 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 a person as described above.

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 the human body and the presence / absence of a person in the divided region within the subdivided detection range 4 corresponding to each.

5 (1) and 5 (2) are diagrams for explaining the subdivided divided regions of the detection range 4. FIG. 5 (1) is an explanatory diagram of a divided region in a “2 × 2” element form in which thermopile elements are arranged in two elements in the vertical direction and two elements in the horizontal direction. Further, FIG. 5 (2) is an explanatory diagram of a divided region in a “4 × 4” element form in which thermopile elements are arranged in four elements in the vertical direction and four elements in the horizontal direction. The form shown in FIGS. 5 (1) and 5 (2) is an example of a form in which the temperature of the human body and the presence / absence of a person are detected for each divided region.

As shown in FIG. 5 (1), in the “2 × 2” element form, the detection range 4 shown in FIG. 3 is evenly divided into four according to the number of thermopile elements. Each of the divided regions of the detection range 4 divided into four has a rectangular area range of about 1.8 m × 1.8 m.

In the "2x2" element form, the thermopile element arranged in the upper left detects the human body or the like corresponding to the upper left divided region assigned the number "1", and the thermopile element arranged in the upper right is the number "1". The human body or the like is detected corresponding to the upper right divided area to which "2" is given. Similarly, the thermopile elements arranged in the lower left detect the human body and the like corresponding to the divided region in the lower left assigned the number "3", and the thermopile elements arranged in the lower right are assigned the number "4". The human body or the like is detected corresponding to the divided area at the lower right.

In the “2 × 2” element form shown in FIG. 5 (1), the temperature of the human body and the presence / absence of a person are detected for each divided region of the detection range 4 evenly divided. Therefore, in the “2 × 2” element form shown in FIG. 5 (1), the thermopile sensor 2 can detect the number of people up to 4 people based on the presence / absence of people in each divided region, and the detection range 4 It becomes possible to identify the distribution of people existing in the area.

The "4x4" element form in which the thermopile elements are arranged in four elements in the vertical direction and four elements in the horizontal direction is also the same as the "2x2" form. That is, as shown in FIG. 5 (2), the detection range 4 shown in FIG. 3 is divided into 16 according to the number of thermopile elements. Each of the 16 divided areas of the detection range 4 has a rectangular area of about 0.9 m × 0.9 m.

Further, in the "4x4" element form, the thermopile element arranged in the upper left detects the human body or the like corresponding to the upper left divided region assigned the number "1", and the thermopile arranged in the upper right. In the element, the human body or the like is detected corresponding to the upper right divided region to which the number “4” is assigned. Similarly, in the thermopile element arranged in the lower left, the human body or the like is detected corresponding to the divided region in the lower left assigned the number "13", and in the thermopile element arranged in the lower right, the number "14" is assigned. The human body or the like is detected corresponding to the assigned divided area at the lower right.

In the "4 x 4" element form shown in FIG. 5 (2), the thermopile sensor 2 detects the number of people up to 16 based on the presence / absence of people in each divided area of about 0.9 m × 0.9 m. At the same time, it becomes possible to identify the distribution of people existing in the detection range 4. In the "4x4" element form, the distribution of people existing in the detection range 4 of about 3.6m x 3.6m can be specified with the accuracy of the area range of about 0.9m x 0.9m.

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

The person 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 detects an area range of about 3.6 m × 3.6 m centered on the position directly below the MEMS non-contact temperature sensor 2a. It has a range of 4. The human detection system 1 is provided with one or more thermopile sensors 2 to enable detection of the presence / absence of a human body, position distribution, and temporal position change (dynamic transition) in a wide range of rooms such as offices. ..

In FIG. 6, the control device 10 has 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 connected to each other by 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 meets a predetermined purpose by executably deploying the program stored in the auxiliary storage device 13 by the CPU 11 in the work area of the main storage device 12 and controlling peripheral devices through the execution of the program. 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. Further, 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 expands 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 for storing a program executed by the CPU 11 and operation setting information. 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. In addition, the above-mentioned components may be provided in a plurality of each, or some components may not be provided.

In the control device 10, the presence / absence of a human body or the like within the detection range 4 detected by the thermopile sensor 2, the number of people, the temperature of the human body or the like is acquired via the communication IF 14. Further, the illuminance of the floor surface 5 directly under the sensor detected via the illuminance sensor 2b of the thermopile sensor 2 is acquired via the communication IF 14. Similarly, operation input via an input device such as a remote controller, a pointing device, or a keyboard is accepted via the input / output IF15. Further, display data and information to a display device such as an LCD (Liquid Crystal Display) are output via the input / output IF15.

Of the processes executed by the control device 10, at least a part of the processes 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 dedicated LSI (large scale integration) such as a numerical arithmetic processor, a vector processor, or another digital circuit. Further, at least a part of the processing may include an analog circuit.

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

As a result, the human detection system 1 according to the present embodiment uses the thermopile sensor 2 when the illuminance data detected via the illuminance sensor 2b is equal to or less than a predetermined threshold value even if there is a range in which sunlight shines in the room. Human body detection can be enabled. For example, in a situation where sunlight does not shine into the room such as in rainy weather, cloudy weather, or at night, the human body can be detected via the thermopile sensor 2.

Here, a predetermined threshold value for the illuminance data can be experimentally obtained in advance. For example, the installer or manager of the control system provided with the person detection system 1 acquires the illuminance data in the indoor range where the sunlight or the like shines through the thermopile sensor 2 installed on the ceiling or the like. The manager or the like acquires, for example, the illuminance data of the indoor range in which the solar radiation or the like that changes on a weekly basis, a monthly basis, a seasonal unit, or the like shines. Then, the manager or the like may determine the predetermined threshold value 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 value for the illuminance data may be changed according to the daily history, the monthly history, the season, etc., reflecting the solar radiation or the like that changes in the weekly, monthly, or seasonal units.

The illuminance data may be acquired from, for example, an illuminance sensor included in a control system (for example, a lighting control system) combined with the person detection system 1. At least, it suffices if the illuminance data in the range in which the indoor radiation shines, including the detection range 4 of the thermopile sensor 2 and a part of the detection range 4, can be acquired. The control device 10 may acquire the illuminance data detected by the illuminance sensor of the control system or the like via the communication IF 14, for example. In the following, the illuminance data will be described as illuminance data detected by the illuminance sensor 2b of the thermopile sensor 2.

Further, when the human body detection of the detection range 4 based on the illuminance data is invalidated, the human detection system 1 according to the present embodiment is within the detection range of another thermopile sensor 2 adjacent to the disabled detection range 4. Based on the human body detection information detected in, it is estimated that the human body and the like enter and exit the invalidated detection range 4.

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 a human body or the like within the detection range 4, the number of people, the temperature of the human body or the like. The presence / absence of the human body or the like within the detection range 4 is detected for each divided region 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 or the like detected in each divided region and the temporal change of the number of people counted within the detection range 4. It becomes possible to estimate the entry and exit of the human body and the like between adjacent detection ranges.

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

At the time of the above estimation, the human detection system 1 may exclude the detection range 4 in which the human body or the like is not continuously detected for a predetermined period, or the divided region within the detection range 4. The human detection system 1 according to the present embodiment can move to the invalidated detection range by excluding the detection range 4 in which the human body or the like is not continuously detected for a predetermined period or the divided area within the detection range 4. It is possible to improve the estimation accuracy of entry and exit and reduce the processing load related to estimation.

According to the human detection system 1 according to the present embodiment, it is possible to improve the accuracy of the human detection system using the thermopile sensor 2.

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

For example, the area B1 corresponds to the detection range 4 of the thermopile sensor 2 # 1, and the area B8 corresponds to the detection range 4 of the thermopile sensor 2 # 8. Further, the area C1 corresponds to the detection range 4 of the thermopile sensor 2 # 9, and the area C8 corresponds to the detection range 4 of the thermopile sensor 2 # 16. The hatched areas C1, C2, C3, C4, C5, and C7 in FIG. 7 represent indoor areas where sunlight is shined through a window or the like.

Further, 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 one or more thermopile elements constituting the MEMS non-contact temperature sensor 2a. .. In the explanatory 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 divided into a detection area associated with each thermopile element, that is, a 16-divided divided area. It is subdivided. In each subdivided region, the distribution of people existing in the detection range 4 can be specified in the area range of the subdivision region.

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

In FIG. 7, the hatched divided regions, for example, the divided regions U6 and U10 of the region B2 represent regions in which the presence of a human body or the like is detected via the thermopile sensor 2. Division of region B3, division region U16 of region B4, division region U13 of region B5, division region U13 and U14 of region B7, division regions U6 and U10 of region B8, division region U1 of region C6, division of region 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 are connected to the thermopile sensor 2 # 16 by using the connection form shown in FIG. FIG. 8 is an example of a multi-drop configuration by daisy chain connection. In the connection form of FIG. 8, the thick solid line represents a communication connection such as RS-485, and the solid line represents a power supply connection. In the connection mode of FIG. 8, power is supplied from the control device 10 to each thermopile sensor 2, but for example, power may be supplied from the control system side 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 within the detection range 4 for each thermopile sensor 2 based on the acquired illuminance data. Disable. Further, in the human detection system 1, another thermopile sensor 2 adjacent to the disabled thermopile sensor 2 is specified, and based on the human detection information within the detection range 4 of the specified other thermopile sensor 2. , It is estimated that people, etc. enter and leave the invalidated detection range.

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

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

FIG. 9 is a diagram illustrating a communication procedure in the human detection system 1. FIG. 9 shows master-slave communication in which the control device 10 is used as a master device and each thermopile sensor 2 (2 # 1, 2 # 2) connected in a daisy chain is used as a slave device to specify an ID address for communication. This is an example of the procedure. As such a communication procedure, for example, a communication procedure based on the RTU mode of Modbus (registered trademark) Protocol of Modicon is exemplified. In the above communication procedure, in addition to the communication for specifying the ID address, it is possible to broadcast data communication to one or more thermopile sensors 2 to which the master device is connected on the same bus all at once.

As shown in FIG. 9, in the human detection system 1, when the activation of each slave device connected on the bus is completed (for example, the communicable state after the energized state) is triggered between the master device and each slave device. Communication becomes possible. For example, the control device 10 which is a master device receives a notification of power supply to each slave device or power supply from the control system side combined with the human detection system 1, and after a predetermined period (“start wait t1”) elapses. , Communication to the slave device may be started. In the thermopile sensor 2, which is a slave device after the startup is completed, for example, the display LED 2c is lit in green.

In the human detection system 1, for example, serial communication compliant with the RTU mode of Modbus (registered trademark) Protocol of Modicon Co., Ltd. is performed between each slave device connected on the bus and the master device. The control device 10 of the master device specifies the ID address of the slave device to be communicated and transmits various commands (t2, t4, t6). Each slave device monitors the communication data on the bus, and if the communication data includes the ID address of the own slave device, it responds (t3, t5, t7) with a response corresponding to the command. As shown in FIG. 9, 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 after receiving the communication data including various commands. The human detection system 1 may detect a temperature state change of a predetermined size of each slave device connected on the bus as an event, and may adopt data communication between the master / slave triggered by the detection. .. The human detection system 1 can reduce the communication load and capture the state change detected by each slave device.

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

For example, the control device 10 specifies 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). The thermopile sensor 2 # 1 transmits a response including the illuminance data detected by the illuminance sensor 2b together with its own ID address to the control device 10 (t3). The control device 10 specifies the ID address of the thermopile sensor 2 # 2 on the bus after the waiting period elapses after the response reception of the thermopile sensor 2 # 1 is completed, and requests the illuminance data detected by the illuminance sensor 2b. Is transmitted (t4). From the thermopile sensor 2 # 2, a response including the ID address of the thermopile sensor 2 # 2 and the detected illuminance data is transmitted on the bus (t5).

Further, in the serial communication, the continuous command transmission interval to the same slave device is required to be an interval period of about 300 msec or more 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 designates the ID address of the thermopile sensor 2 # 1 after the elapse of the interval period, and the MEMS non-contact temperature sensor 2a. A command for disabling human body detection is transmitted (t6). The thermopile sensor 2 # 1 invalidates the detection range 4 related to the human body detection of the MEMS non-contact temperature sensor 2a, and responds with a response including information (for example, flag information) indicating the invalid state of the human body detection (t7). ).

Further, for example, when the illuminance data of the thermopile sensor 2 # 1 is equal to or less than a predetermined threshold value, the control device 10 is within the detection range 4 detected via the MEMS non-contact temperature sensor 2a after the lapse of the interval period. A command requesting human detection information is transmitted (t6). The above 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 the 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 a human body detected for each subdivided region (FIG. 7, divided regions U1 to U16) of the detection range 4 divided into 16. The presence / absence information such as the above 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 the presence (1) / absence (0) of the human body or the like in the divided region.

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) corresponds to FIG. 7. Corresponds to the divided region U1 shown in. In the table Tb2 of FIG. 10, a human body or the like is detected in the divided regions U5, U6, U9, and U10 in the 16-divided detection range 4. As shown in the hatched portion, the thermopile sensor 2 assigns a flag value “1” to the bit position of the “output” line corresponding to each divided region in which the human body or the like is detected, and responds to the control device 10.

When the thermopile sensor 2 has one or more thermopile elements, it is possible to allow / disallow detection of the human body or the like for each of the divided regions of the subdivided detection range 4. be. The control device 10 transmits, for example, a command for permitting / disallowing the detection of a human body or the like for each subdivided divided region to the thermopile sensor 2 in association with the position of each bit constituting the word data.

FIG. 11 is a diagram illustrating a mode in which detection of a human body or the like is permitted / disallowed for each divided region. FIG. 11 (1) is an example of a command for setting permission / non-permission for each division area, which is transmitted from the control device 10 at the time of 16 division to the thermopile sensor 2. FIG. 11 (2) shows the thermopile sensor 2 when permission / non-permission is set for each divided area for detection of a human body or the like.
It is an example of the response response at the time of 16 divisions.

As shown in the table Tb3 of FIG. 11 (1), the control device 10 configures word data together with a predetermined command to permit / disallow the detection of the human body or the like for each divided area of the detection range 4 divided into 16. It 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 structure of the word data, and the "area" row represents the divided area associated with the bit position. The "bit" row and "area" row of table Tb3 are the same as those of table Tb2. Similarly, the "output" row of the table Tb3 represents the flag values of permission (0) / non-permission (1) for the detection of the human body or the like in the divided area.

In the table Tb3 of FIG. 11 (1), the permission for detecting the human body or the like is set for the divided areas U5 and U6 in the 16-divided detection range 4. The thermopile sensor 2 holds word data transmitted from the control device 10 for which permission / non-permission for detection of a human body or the like for each divided area is specified in a predetermined area. Then, when a command requesting human detection information within the detection range 4 is transmitted from the control device 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 described with reference to FIG. However, the thermopile sensor 2 forcibly sets the bit value to "Bit value" for the divided areas U5 and U6 in which the detection of the human body or the like is not permitted (the flag value "1" in the output line of FIG. 11 (1)) is set. Respond with the response 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 regions U5, U6, U9, and U10 in the 16-divided detection range 4. The thermopile sensor 2 inserts "0" into the bit value corresponding to the divided areas U5 and U6 for which disapproval is specified, and the divided areas U9 and U10 that are in the permitted state for the detection of the human body or the like are shown in the figure. As shown in the hatched portion of 11 (2), the bit value “1” is inserted to respond to the response.

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

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

However, in the thermopile sensor 2, it is possible to acquire illuminance data even when the human body detection of the MEMS non-contact temperature sensor 2a is disabled. The control device 10 of the human detection system 1 periodically acquires illuminance data from each thermopile sensor 2 for which human body detection is disabled. It becomes possible to set enable / disable. In the human detection system 1, it becomes possible to enable the human body detection again in the area of the detection range 4 in which the human body detection is once disabled according to the change in the illuminance of the indoor area where the sunlight shines.

Further, the control device 10 may invalidate the 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 shown in FIG. 5 (1) via a plurality of illuminance sensors. If the control device 10 designates the divided areas U1 to U16 existing in the four divided areas and sets each human body detection to allow / disallow, on condition that the acquired illuminance data exceeds a predetermined threshold value. good.

In FIG. 7, the illuminance data corresponding to the divided regions U9, U10, U13, U14 of the region C1 exceeds a predetermined threshold value, and the illuminance data corresponding to the divided regions U11, U12, U15, U16 of the region C1 is predetermined. It is assumed that the threshold value is exceeded. For example, the control device 10 can specify the divided areas U1 to U8 of the area C1 to allow the human body detection, and can specify the divided areas U9 to U16 of the area C1 to disallow the human body detection. By setting the permission / non-permission of the human body detection for each divided area, the control device 10 can improve the setting accuracy of the valid / invalid of the human body detection based on the illuminance data.

(Case 2)
When the control device 10 is set to invalidate the human body detection in the target area based on the illuminance data, the control device 10 disables it based on the time-series information of the human body detection position detected in the adjacent area adjacent to the target area. Estimate the entry and exit of the human body, etc. into the target area.

In the human detection system 1 of FIG. 7, the control device 10 invalidates the human body detection in the regions C1, C2, C3, C4, C5, and C7 based on the illuminance data for each thermopile sensor 2 detected by the illuminance sensor 2b. It is assumed that it was done. The control device 10 obtains, for example, an adjacent area adjacent to each area in which the human body detection is disabled, based on the correspondence 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, a thermopile sensor 2 # 1 having a region B1 as a 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 area adjacent to each of the invalidated areas at predetermined cycle intervals. 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 the human body detected for each subdivided divided region. .. Information such as the presence / absence of the human body detected for each divided region is a flag value associated with the position of each bit constituting the word data (existence (1)) as described with reference to FIG. / Acquired as absent (0)).

For example, in the region C7 in which human body detection is disabled, the presence of a human body or the like 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 mainly stores the information such as the presence / absence of the human body for each adjacent area acquired at predetermined cycle intervals in association with, for example, the identification number of the divided region and the time information obtained from the above information. Store in a predetermined area such as the device 12. The same 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 stores information such as the presence / absence of the human body or the like in each adjacent region sampled at predetermined cycle intervals in the main storage device 12 or the like. Then, the control device 10 estimates the entry / exit of the human body or the like into each invalidated area based on the above information stored in the main storage device 12 or the like.

For example, the control device 10 compares the information on the presence / absence of the human body or the like before and after in the time series for each adjacent region, and specifies the change in the detection state of the human body or the like from “presence” to “absence”. 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. I'm in contact.

The control device 10 is, for example, "present" when the detection state of the human body or the like in the divided region U13 of the region C8, which is back and forth in a time series sampled at predetermined cycle intervals, changes from "present" to "absent". It is presumed that the human body or the like detected in the state has moved beyond the boundary to the invalidated area C7. Since the control device 10 can estimate the entry and exit of a person into the invalidated area in the divided area unit, the estimation accuracy can be improved.

Here, the control device 10 disables 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 “presence” to “absence”. It may be added to the estimation condition of the movement to C7. When the presence / absence of a human body or the like is detected for each divided region, the control device 10 has, for example, a flag value “1” indicating the “presence” state in the word data from the thermopile sensor 2 # 16 corresponding to the region C8. By counting the quantity of "", the number of people within the detection range 4 can be specified. Alternatively, the control device 10 may acquire the human body detection information for each divided region in the detection range 4 as well as the number of people information in the detection range 4 from the thermopile sensor 2 # 16 corresponding to the region C8.

Further, the control device 10 has a detection range 4 of each thermopile sensor 2 arranged in the room and a divided area in which a human body or the like is detected within each detection range 4 from the above information stored in the main storage device 12 or the like. The map information associated with may be generated. From the map information, the detection position of the human body or the like within the detection range 4 can be specified.

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

The control device 10 determines the estimation conditions for estimating the movement to the invalidated region of 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 or the like specified by the map information. May be added to.

Similarly, the control device 10 compares the information on the presence / absence of the human body or the like before and after in the time series for each adjacent region, and is based on the change in the detection state of the human body or the like from "absence" to "presence". Therefore, it is possible to estimate the movement of the human body or the like from the invalidated area.

The control device 10 is, for example, "present" when the detection state of the human body or the like in the divided region U13 of the region C8, which is back and forth in a time series sampled at predetermined cycle intervals, changes from "absent" to "present". It is presumed 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 estimation of the movement to the invalidated region C7 is performed within at least a predetermined period from the estimation time. Further, the estimation of the movement from the invalidated region C7 may be limited to the change from "absence" to "presence" of the detection state of the human body or the like in the divided region tangent to the boundary of the region C7.

For example, the divided regions tangent to the boundary of the region C7 in FIG. 7 are the divided regions U16 of the region B6, the divided regions U13 to U16 of the region B7, the divided regions U13 of the region B8, and the divided regions U4, U8, U12, U16 of the region C6. , U1, U5, U9, U13 of the divided regions of the region C8 are exemplified. Such an 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 in the presence / absence of the human body or the like in each divided region accumulated in the main storage device 12 or the like of the control device 10 at predetermined cycle intervals can be represented as a time-series locus within the detection range 4. .. For example, in FIG. 7, when the human body or the like detected in the divided region U7 of the region B5 moves from the divided region U7 to the U15 via the divided region U11 over time, the human body detection state within the detection range 4 is divided. Represented as a locus on the region.

The control device 10 specifies a locus on the divided region within the detection range 4, for example, based on changes 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 the detection state from "presence" to "absence" in the time-series back and forth in the transition direction of the specified locus and the divided region tangent to the boundary between the invalidated region. It may be possible to estimate the movement of the human body or the like to the invalidated area based on the change.

For example, it is assumed that the “existing” state indicating the detection of the human body or the like in the region B5 of FIG. 7 has changed to the divided region U7 → U11 → U15 with the passage of time. The control device 10 identifies the transition direction (for example, downward from the divided region U7) from the locus in the detection range 4 of the “presence” state with the passage of time. Then, when the detection state of the divided region U15 tangent to the boundary with the invalidated region C5 changes from "presence" to "absence", the control device 10 moves into the invalidated region C5. Estimate the movement of the human body, etc. In the control device 10, the entry / exit to / from 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. can.

The above estimation process can be applied to a region in which the thermopile sensor 2 is not arranged in the room as a target region. The control device 10 may hold at least map information or the like indicating the arrangement position of the thermopile sensor 2 in the room in the auxiliary storage device 13 in advance. The control device 10 can specify an area in which the thermopile sensor 2 is not arranged in the room based on the map information, the arrangement position of the thermopile sensor 2, and the detection range 4 of the thermopile sensor 2.

Further, the control device 10 sets the area in the room where the thermopile sensor 2 is not arranged as the target area based on the map information or the like, for example, the area of the detection range 4 adjacent to the target area and the boundary between the target areas. It is possible to specify the divided area in contact with. The control device 10 can estimate, for example, the entry / exit of the human body or the like into or out of the target area from the change in the detection state of the human body or the like with the passage of time in the divided region tangent to the boundary with the specified target area. ..

Regarding the target area where the entry / exit of the human body or the like is estimated by the control device 10, for example, the flag value indicating that the information is the estimated value for the "presence" / "absence" information indicating the detection state of the human body or the like is set. It is given and the detection status is managed. 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 "presence" / "absence" indicating the estimated detection state. Along with the information of "", a flag value (for example, "1") indicating that it is an estimated value is output. The control system can identify that the output human body detection information is in the estimated state based on the flag information.

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

The control device 10 reflects the non-detection area when estimating the entry / exit of the human body or the like into the invalidation area of the human body detection described in (Case 2) or the target area such as the non-installed area of the thermopile sensor 2. By doing so, it becomes possible to reduce the processing load. The control device 10 refers to, for example, the non-detection area held as management information in the auxiliary storage device 13 or the like, and excludes the non-detection area from the detection range 4 of each thermopile sensor 2 adjacent to the target area. In the detection range 4 in which the non-detection region is excluded, the divided region for monitoring the change in the detection state of the human body or the like with the passage of time is limited. Therefore, in the control device 10, it can be expected that the processing load when estimating the entry and exit of the human body or the like to the target area can be reduced.

<4. Processing flow>
Next, the detection process according to the present embodiment will be described with reference to FIGS. 12 and 13. FIG. 12 is a flowchart showing an example of valid / invalid setting processing of human body detection of the thermopile sensor 2 by solar radiation. The control device 10 according to the present embodiment provides the processes shown in FIGS. 12 and 13 by, for example, the CPU 11 or 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 activation is completed, which is arranged on the ceiling or the like in the room. The control device 10 specifies an ID address assigned to each thermopile sensor 2 after completion of activation connected to the communication bus, and transmits a command requesting illuminance data detected by the illuminance sensor 2b. do. As described with reference to FIGS. 7 to 11, the control device 10 receives a response according to the above command from each thermopile sensor 2 connected on the communication bus, and is detected by the illuminance sensor 2b included in each response. The illuminance data corresponding to the detection 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 of a control system or the like 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 whose illuminance data acquired in the process of S1 exceeds a predetermined threshold value, and for each thermopile sensor 2 whose illuminance data exceeds a predetermined threshold value. The detection range 4 is set to invalid (S2). The valid setting and invalid setting of the detection range 4 are, for example, via transmission of a command for disabling 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. Will be done.

The control device 10 sets the ID address of each thermopile sensor 2 in which the detection range 4 is disabled in the processing of S2 and the ID address of each thermopile sensor 2 in which the detection range 4 is enabled, together with the time information, to the predetermined value of the main storage device 12. Temporarily store in the area of (S3). The information stored in the process of S3 is updated based on the illuminance data corresponding to the detection range 4 of each thermopile sensor 2 acquired at a predetermined cycle interval. The control device 10 ends the process of FIG. 12 after the process of S3.

By 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 subjected to the condition that the predetermined threshold value of the illuminance data corresponding to the detection range 4 is exceeded. It is possible to invalidate the detection of the human body and the like. The human detection system 1 including the control device 10 according to the present embodiment is 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 sunlight shines in the room. You can enable / disable detection. In the human detection system 1 according to the present embodiment, the human body can be detected via the thermopile sensor 2 in a situation where the sunlight does not shine into the room such as in rainy weather, cloudy weather, and nighttime.

FIG. 13 is a flowchart showing an example of estimation processing of a human body or the like for a region in which human body detection is disabled. In the flowchart of FIG. 13, the start of the process is exemplified when the human body detection is enabled / disabled 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 for enabling human body detection, which is adjacent to the detection range 4 of each disabled thermopile sensor 2 (S11). As described with reference to FIG. 7, in the control device 10, for example, the human body detection is disabled due to the correspondence between the arrangement position of each thermopile sensor 2 arranged in the room and the ID address of each thermopile sensor 2. Identify adjacent areas adjacent to each target area. The correspondence between the arrangement position of each thermopile sensor 2 arranged in the room and the ID address of each thermopile sensor 2 is held in the auxiliary storage device 13 in advance, for example.

The control device 10 acquires the person detection information detected at a predetermined cycle interval for the effective detection range specified by the process of S1, and the time information and the identification number of the divided region in which the human body or the like is detected in the acquired person detection information. Is stored in a predetermined area of the main storage device 12 in association with the above (S12). The person detection information includes the "presence" / "absence" of the human body or the like for each divided area, the number of people within the activated detection range 4, and the like. Further, the position of the human body or the like within 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 transition in time series.

When the human detection information on the time series of the adjacent effective detection range accumulated in the process of S12 satisfies a predetermined estimation condition, the control device 10 estimates the movement to the invalidated detection range (S13). The entry and exit of the human body and the like with respect to the invalidated detection range has been described with reference to FIG. 7 and the like.

The control device 10 adds information (for example, a flag value) for distinguishing the movement target estimated in the process of S13, and outputs the human body detection information in the invalidated detection range (S14). For the control system combined with the human detection system 1, it is shown that it is an estimated value together with the "presence" / "absence" information for each divided area indicating the estimated detection state in the invalidated detection range. The 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 device 10 can apply the process exemplified in FIG. 13 to the area in the room where the thermopile sensor 2 is not arranged as a target area. The control device 10 previously stores map information or the like indicating the arrangement position of the thermopile sensor 2 in the room as the auxiliary storage device 13.
It should be held in. The control device 10 can specify a target area in which the thermopile sensor 2 is not arranged in the room based on the map information, the arrangement position of the thermopile sensor 2, and the detection range 4 of the thermopile sensor 2. Further, the control device 10 can specify the area of the detection range 4 adjacent to the target area and the divided area in contact with the boundary between the target area and the target area based on the map information and the like. The control device 10 can estimate, for example, the entry / exit of the human body or the like into or out of the target area from the change in the detection state of the human body or the like with the passage of time in the divided region in contact with the boundary with the specified target area.

By the above processing, in the control device 10 according to the present embodiment, the disabled detection range 4 or the human body detection detected within the detection range of the other thermopile sensor 2 adjacent to the non-installed area of the thermopile sensor 2. Based on the information, it is possible to estimate the entry and exit of the human body or the like into the invalidated detection range 4 or the non-installed area of the thermopile sensor 2. In the human detection system 1 according to the present embodiment, even if there is a range in which sunlight shines in the room, the human detection accuracy based on the human body detection information detected within the detection range of another adjacent thermopile sensor 2 is achieved. Improvement is possible.

In the control device 10, when estimating the entry and exit of the human body or the like, the detection range 4 in which the human body or the like is not continuously detected for a predetermined period or the divided region within the detection range 4 is specified from the accumulated data. , May be excluded. The human detection system 1 according to the present embodiment has a detection range 4 in which a human body or the like is not continuously detected for a predetermined period, or a detection range invalidated by excluding a divided area within the detection range 4. , It is possible to improve the estimation accuracy of the entry and exit of the human body and the like into the non-installed area of the thermopile sensor 2 and reduce the processing load related to the estimation.
Further, the control device 10 stores, for example, the building space information of the office of a factory, school, or company to which the person detection system 1 is applied in the auxiliary storage device 13, and specifies the non-detection area based on the building space information. May be. The architectural space information includes, for example, the arrangement position of furniture such as walls, passages, doors, desks and racks. By using the building space information, the control device 10 can improve the estimation accuracy of the entry and exit of the human body and the like.
Further, the control device 10 learns the transition of the non-detection region held in the auxiliary storage device 13 or the like, and continuously covers the non-detection region in which the entry and exit of the human body or the like is not detected for a predetermined period (for example, one month). It may be estimated to be the layout area of equipment such as pillars, desks and racks. Then, the control device 10 may generate building space information of a factory, a school, a company office, or the like to which the person detection system 1 is applied from the estimated arrangement area. Even if the building space information of factories, schools, corporate offices, etc. to which the human detection system 1 is applied cannot be obtained in advance, by using the generated building space information, the estimation accuracy of the entry and exit of the human body, etc. Can be expected to further increase. According to the present embodiment, there is provided a technique capable of improving the accuracy of a human detection system using a thermopile sensor.

The above-described embodiment may be appropriately modified and implemented without departing from the gist of the present disclosure. The person 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 and position distribution of a human body or the like in a room such as a factory, a school, a company office, or a house. May be good. Examples of the control system for controlling such a living environment include an air conditioning control system and a lighting control system. In addition, a part of the service system that provides various services such as monitoring and monitoring of the human body occupying the elderly facility, etc., using the information such as the presence / absence and position distribution of the human body, etc. 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 supply IF
2g communication IF
2h I / O IF
2i Mounting spring 3 Ceiling 4 Detection range 5 Floor surface 10 Control device 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 by the object in the detection area using the thermoelectric effect,
An illuminance sensor that detects the illuminance in the detection area and
It has one or more infrared sensors and a control device connected to the illuminance sensor.
The control device is
The target by the infrared sensor associated with the detection area where the acquired illuminance exceeds a predetermined threshold among the one or more infrared sensors while acquiring the illuminance in the detection area of the one or more infrared sensors. Invalidation means to disable body detection,
A human detection system characterized by being equipped with. The control device is
Among the one or more infrared sensors, a specific means for specifying a first adjacent detection area adjacent to the invalidated detection area from the detection area of the infrared sensor for which detection of the object is effective, and
Detection information including at least one of the quantity of the target body detected in the first adjacent detection region and the distribution of the target body in the first adjacent detection region is acquired at a predetermined cycle, and the first. (1) A storage means for accumulating the detection information acquired from the adjacent detection area in association with the time information, and
An estimation means for estimating the entry / exit of the object to the invalidated detection region from the time series of the accumulated detection information, and
The person detection system according to claim 1, further comprising. The detection information includes the presence / absence of the target body for each of a plurality of divided regions in which the detection region is evenly divided.
The specifying means identifies a divided region in the first adjacent detection region that touches the boundary between the invalidated detection region and the disabled detection region.
The estimation means estimates the entry / exit of the target body to the invalidated detection region from the change in the presence / absence of the target body in the specified divided region in the time series of the detection information. The person detection system according to claim 2, which is characterized. The estimation means identifies a non-detection region in which the target body is not detected for a certain period of time in the first adjacent detection region from the time series of the accumulated detection information, and the accumulated detection information. From the change in the presence / absence of the target body in the first adjacent detection area excluding the specified non-detection area in the time series of the above, the entry / exit of the target body to the invalidated detection area is estimated. The person detection system according to claim 2, wherein the person detection system is characterized in that. 4. The estimation means is characterized in that the non-detection area is specified based on the building space information including the position information of at least one of the wall, the door, the furniture, the passage, and the equipment in the detection area. The person detection system described. The specific means is adjacent to the non-installed area from the detection area of the one or more infrared sensors based on the map information including the installed position of the one or more infrared sensors and the non-installed 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 target body to the non-installed area from the change in the presence / absence of the target body in the specified second adjacent detection region in the time series of the accumulated detection information. The person detection system according to claim 2, wherein the person detection system is characterized in that. The control device is
When the entry and exit of the object to the invalidated detection area is estimated by the estimation means, information indicating that the object in the invalidated detection area is estimated is added. The person detection system according to any one of claims 2 to 5, further comprising an output means for outputting. One or more infrared sensors that detect the amount of infrared rays emitted by an object in the detection area using a thermoelectric effect, an illuminance sensor that detects the illuminance in the detection area, the one or more infrared sensors, and the illuminance sensor. In a person detection system with a control device to connect
The control device
The target by the infrared sensor associated with the detection area where the acquired illuminance exceeds a predetermined threshold among the one or more infrared sensors while acquiring the illuminance in the detection area of the one or more infrared sensors. Disable step to disable body detection,
A person detection method characterized by performing.

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