WO2018216362A1 - Système d'aide aux soins - Google Patents

Système d'aide aux soins Download PDF

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Publication number
WO2018216362A1
WO2018216362A1 PCT/JP2018/014461 JP2018014461W WO2018216362A1 WO 2018216362 A1 WO2018216362 A1 WO 2018216362A1 JP 2018014461 W JP2018014461 W JP 2018014461W WO 2018216362 A1 WO2018216362 A1 WO 2018216362A1
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Prior art keywords
unit
sensor unit
sensor
radiation frequency
image
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PCT/JP2018/014461
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English (en)
Japanese (ja)
Inventor
和田　滋
楠田　将之
木戸　稔人
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コニカミノルタ株式会社
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Priority to JP2019519501A priority Critical patent/JPWO2018216362A1/ja
Publication of WO2018216362A1 publication Critical patent/WO2018216362A1/fr

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/103—Detecting, measuring or recording devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
    • A61B5/11—Measuring movement of the entire body or parts thereof, e.g. head or hand tremor, mobility of a limb
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/103—Detecting, measuring or recording devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
    • A61B5/11—Measuring movement of the entire body or parts thereof, e.g. head or hand tremor, mobility of a limb
    • A61B5/113—Measuring movement of the entire body or parts thereof, e.g. head or hand tremor, mobility of a limb occurring during breathing

Definitions

  • the present invention provides a care support system in which a sensor unit disposed in a casing of a moving object detection unit installed in a subject's living room detects biological information (for example, a respiratory state) of the subject by radiating and receiving radio waves. It is about.
  • JP 2006-3289 A (refer to claim 1, paragraphs [0022], [0023], etc.)
  • Patent Document 1 The method described in Patent Document 1 is effective only when the signal to be observed (the reflected wave from the object) is larger than the clutter signal.
  • the signal to be observed is smaller than the clutter signal, the signal to be observed is buried in the clutter signal. Therefore, when the subtraction process is performed, the signal to be observed cannot be detected.
  • a signal for example, a respiratory signal
  • the signal (breathing signal) to be observed is often smaller than the clutter signal. Therefore, in the care support system, a method of removing the clutter signal by subtraction processing cannot be adopted.
  • the sensor unit Doppler sensor
  • the sensor unit is covered with a casing, and is installed on the ceiling of a living room, for example.
  • the direction of a sensor part is normally adjusted so that it may face the direction of the bed and the futon in a living room (in order to detect the respiratory state in bedtime).
  • the relative positional relationship for example, the relative distance
  • the present invention has been made in order to solve the above-described problems.
  • the object of the present invention is to reduce detection accuracy in a sensor unit (Doppler sensor) by reducing clutter as noise without performing subtraction processing of the clutter signal.
  • An object of the present invention is to provide a care support system that can suppress variation in detection performance due to the orientation of a sensor unit.
  • a care support system is disposed in a casing of a moving object detection unit installed in a subject's room, and detects a biological information of the subject by emitting and receiving radio waves,
  • the noise level detected by the sensor unit for each different direction of the radiation control unit that controls the radiation frequency of the radio wave and the sensor unit in the housing is higher than a predetermined level at which the biological information can be detected.
  • a storage unit that stores a table that defines a specific radiation frequency that decreases, and the radiation control unit determines a radiation frequency of the radio wave radiated from the sensor unit according to a setting of an orientation of the sensor unit. The specific radiation frequency corresponding to the direction of the sensor unit obtained based on the table is switched.
  • the clutter signal subtraction process is not performed in post-processing, and noise clutter can be reduced to increase detection accuracy at the sensor unit, and variations in detection performance due to the orientation of the sensor unit can be suppressed. .
  • FIG. 1 is an explanatory diagram showing a schematic configuration of a care support system 1 of the present embodiment.
  • the care support system 1 is a system for supporting the daily life of a cared person living in a nursing facility or a general house, or a patient admitted to a hospital (nurse), and is also called a monitoring system. It is.
  • the cared person and the cared person are objects to be supported by the care support system 1, that is, a target person (subject) managed by recognition or detection in the image recognition system 20 or the radio wave detection unit 30 described later. .
  • a target person subject
  • the care support system 1 is constructed in a care facility will be described.
  • the staff station 100 is a so-called stuffing station for caregivers who support the lives of the care recipients who spend at the care facilities.
  • the staff station 100 is provided with a management server 100a and a display unit 100b.
  • the management server 100a is a terminal device that is communicably connected to a later-described moving object detection unit 10 installed in the living room 101 via the communication line 200, and includes a central processing unit (CPU; Central Processing Unit). Composed.
  • the communication line 200 is configured by, for example, a wired LAN (Local Area Network), but may be a wireless LAN.
  • the management server 100a receives and manages various types of information transmitted (output) from the moving body detection unit 10 (for example, a captured image in the living room 101 and biological information of the care recipient) via the communication line 200, The received information is displayed on the display unit 100b. Thereby, the caregiver of the care facility can grasp the state in the living room 101 and the biological information of the care recipient by looking at the information displayed on the display unit 100b.
  • the display unit 100b can be configured by a display of a personal computer, for example.
  • the management server 100a moves the moving object detection unit.
  • At least one living room 101 is provided in a care facility, and FIG. 1 shows a case where two living rooms 101 are provided as an example.
  • each living room 101 one bed 102 used by a care recipient is installed.
  • a plurality of beds 102 corresponding to each of the care recipients are installed.
  • FIG. 2 is an explanatory diagram schematically showing the inside of the living room 101 in which the moving object detection unit 10 is installed.
  • the moving body detection unit 10 is installed on the ceiling portion 101 a of each living room 101 and is communicably connected to a communication line 200.
  • the living room 101 is a multi-bed room in which a plurality of beds 102 are installed
  • the moving object detection unit 10 is installed on the ceiling 101 a of the living room 101 corresponding to each bed 102.
  • the care support system 1 described above includes a moving body detection unit 10 (at least one moving body detection unit 10) installed in at least one living room 101 and a management server 100a provided in the staff station 100 via a communication line 200. Are connected to communicate with each other.
  • FIG. 3 is a block diagram showing a schematic configuration of the moving object detection unit 10.
  • the moving body detection unit 10 is a unit that detects information on a cared person in the living room 101, and includes an image recognition system 20, a radio wave detection unit 30, and a unit control unit 40 in a housing 11 (see FIG. 6). Yes. Since the moving body detection unit 10 includes various sensors such as the above-described radio wave detection unit 30 and an optical detection unit 23 described later, it is also called a sensor box.
  • the image recognition system 20 includes an illumination unit 21, an illumination control unit 22, and an optical detection unit 23.
  • the illumination unit 21 includes an LED (LightLEDEmitting Diode) that emits infrared light (for example, near-infrared light) to enable photographing in the dark, and is provided at the center of the ceiling 101a of the living room 101. Located to illuminate the interior of the living room 101.
  • the illumination unit 21 has a plurality of LEDs and illuminates a floor surface 101b (see FIG. 2) in the living room 101 and a wall connecting the ceiling portion 101a and the floor surface 101b.
  • the illumination control part 22 is comprised, for example with CPU, and controls the illumination (infrared light emission) by the illumination part 21.
  • the optical detection unit 23 is an imaging unit that captures an image of the interior of the living room 101 under the illumination of the illumination unit 21 and is configured by a camera, for example.
  • FIG. 4 is a block diagram illustrating a detailed configuration of the optical detection unit 23, and FIG. 5 schematically illustrates an example of an image acquired by photographing with the optical detection unit 23.
  • the optical detection unit 23 is disposed adjacent to the illumination unit 21 in the center of the ceiling 101a (see FIG. 2) of the living room 101, and acquires an image of a viewpoint directly above that has a viewing direction immediately below by photographing.
  • the optical detection unit 23 includes a lens 51, an image sensor 52, an AD conversion unit 53, an image processing unit 54, and a control calculation unit 55.
  • the lens 51 is, for example, a fixed focus lens, and is configured by a general super wide angle lens or fisheye lens.
  • a lens having a diagonal angle of view of 150 ° or more can be used.
  • the entire living room 101 can be photographed from the ceiling 101a, and the care recipient in the room and the entire room can be photographed without blind spots.
  • the imaging element 52 is configured by an image sensor such as a CCD (Charge Coupled Device) or CMOS (Complementary Metal Metal Oxide Semiconductor).
  • the image sensor 52 is configured by removing the IR cut filter so that the state of the cared person can be detected as an image even in a dark environment.
  • An output signal from the image sensor 52 is input to the AD conversion unit 53.
  • the AD conversion unit 53 receives an analog image signal of an image captured by the image sensor 52 and converts the analog image signal into a digital image signal.
  • the digital image signal output from the AD conversion unit 53 is input to the image processing unit 54.
  • the image processing unit 54 receives the digital image signal output from the AD conversion unit 53 and executes image processing such as black correction, noise correction, color interpolation, and white balance on the digital image signal. .
  • image processing such as black correction, noise correction, color interpolation, and white balance on the digital image signal.
  • the image-processed signal output from the image processing unit 54 is input to the image recognition unit 25 described later.
  • the control calculation unit 55 executes calculations such as AE (Automatic Exposure) related to the control of the image sensor 52 and controls the image sensor 52 such as exposure time and gain. Moreover, the control calculating part 55 performs control while performing calculations, such as a suitable light quantity setting and light distribution setting, with respect to the illumination part 21, as needed.
  • the control calculation unit 55 may have the function of the illumination control unit 22 described above.
  • the image processing unit 54 and the control calculation unit 55 are configured by separate CPUs, for example. However, the image processing unit 54 and the control calculation unit 55 may be configured by a single CPU or by dedicated circuits that perform image processing and calculation processing. May be.
  • the image recognition system 20 described above further includes a storage unit 24 and an image recognition unit 25.
  • the storage unit 24 is a memory that stores a control program executed by the unit control unit 40 and various types of information, and includes, for example, a RAM (Random Access Memory), a ROM (Read Only Memory), a nonvolatile memory, and the like.
  • the image recognition unit 25 performs image recognition processing on the image data of the image acquired by the optical detection unit 23. More specifically, the image recognition unit 25 receives a signal after the image processing unit 54 of the optical detection unit 23 performs image processing, extracts the contour of the object, for example, and shapes it by a method such as pattern matching. An image recognition process for recognizing the image is executed. Thereby, the image recognition part 25 can recognize the state of the cared person in the living room 101.
  • the state of the cared person in the living room 101 is assumed to be rising, getting out of bed, entering the floor, falling over, and the like.
  • Waking up refers to the state from when the cared person wakes up to wake up on the bed.
  • Getting out of bed refers to the state from when the cared person wakes up on the bed until it gets off the floor and leaves the bed.
  • Entering the floor refers to the movement of the care recipient from the floor to the bed and lying down. Falling refers to an action in which the care recipient falls on the floor.
  • the above-mentioned getting-up, getting-off, getting-in, falling-over is accompanied by the movement of the cared person's body (body movement), and the minute movement detected by the radio wave detection unit 30 (the minute movement of the body by breathing etc.) ).
  • the image recognition part 25 can also recognize the shape and position of the bed 102 or the futon in the living room 101 by image recognition.
  • the radio wave detection unit 30 is a block that detects a moving object in the living room 101 by emitting and receiving radio waves.
  • the radio wave detection unit 30 radiates, for example, a 24 GHz band microwave from a radiating unit (not shown) toward the bed of each living room.
  • the reflected wave reflected by Doppler and shifted by Doppler is received by a receiving unit (not shown).
  • the radio wave detection unit 30 can detect biological information (information such as a respiratory state, a sleep state, and a heart rate) of the cared person from the received reflected wave.
  • the radio wave detection unit 30 functions as a microscopic motion detection unit that detects microscopic motion of a care recipient (subject).
  • the unit control unit 40 controls the operations of the image recognition system 20 and the radio wave detection unit 30, and performs image processing and signal processing on information obtained from the image recognition system 20 and the radio wave detection unit 30, and results obtained Is a control board that outputs to the management server 100a as information on the status of the care recipient.
  • the unit control unit 40 includes a main control unit 41, an information processing unit 42, and an interface unit 43, and further includes the storage unit 24 and the image recognition unit 25 described above. Note that the storage unit 24 and the image recognition unit 25 may be provided independently of the unit control unit 40.
  • the main control unit 41 is composed of a CPU that controls the operation of each unit in the moving object detection unit 10.
  • the information processing unit 42 and the image recognition unit 25 may be configured by the above-described CPU (may be integrated with the main control unit 41), or may be another arithmetic unit or a circuit that performs a specific process. It may be configured.
  • the information processing unit 42 uses a predetermined algorithm for information (for example, image data) output from the optical detection unit 23 of the image recognition system 20 and information (for example, data related to a respiratory state) output from the radio wave detection unit 30. Based on the signal processing. Information obtained by the signal processing is used for image recognition in the image recognition system 20 (particularly, the image recognition unit 25).
  • information for example, image data
  • information for example, data related to a respiratory state
  • the network cable (not shown) of the communication line 200 is electrically connected to the interface unit 43.
  • Information relating to the status of the cared person detected by the moving object detection unit 10 based on images and microwaves is transmitted to the management server 100a via the interface unit 43 and the communication line 200.
  • FIG. 6 is a cross-sectional view of the moving object detection unit 10 and the radio wave detection unit 30 in an attached state and a detached state of the front cover 11a with respect to a main body 11b described later of the housing 11.
  • the radio wave detection unit 30 includes a sensor unit 31 and a radome lens 32.
  • the sensor unit 31 is a chip composed of a microwave Doppler sensor for individually detecting biological information of a cared person by emitting and receiving radio waves, and is mounted on a substrate 33.
  • the sensor unit 31 includes an RFLSI (high frequency integrated circuit element), and a transmission antenna and a reception antenna for transmitting and receiving radio waves.
  • the radome lens 32 is a radio wave lens that protects the sensor unit 31 and controls (for example, narrows) the directivity of radio waves radiated from the sensor unit 31, and is located in front of the sensor unit 31 (on the radio wave emission side). It is provided integrally with the sensor unit 31 via the holding unit 34 so as to be positioned.
  • the surface 32a on the sensor unit 31 side is a flat surface
  • the surface 32b on the opposite side to the sensor unit 31 is formed of a plano-convex lens having a convex shape on the radio wave radiation side. It is held by the holding part 34 so as to pass through the center. Therefore, the direction of the sensor unit 31 coincides with the direction of the main axis of the radome lens 32.
  • the main axis of the radome lens 32 is an axis that passes through the center of curvature of the surface 32b of the radome lens 32 and is perpendicular to the surface 32a, and is synonymous with the optical axis or rotational symmetry axis.
  • the angle that defines the “direction of the sensor unit 31” described above is such that the sensor unit 31 has a rotation axis in a direction perpendicular to a horizontal plane (here, the ceiling 101a of the living room 101 where the moving object detection unit 10 is installed).
  • the pitch angle that is a rotation angle when rotating around one rotation axis for example, the left-right direction
  • the yaw angle that is the rotation angle when rotating around the rotation axis for example, the front-rear direction
  • both are treated as a pitch angle in a unified manner.
  • the casing 11 of the moving object detection unit 10 described above includes a front cover 11a located in front of the radome lens 32 (on the side opposite to the sensor unit 31) and the remaining main body 11b.
  • the front cover 11a is detachably installed on the main body 11b.
  • the substrate 33 on which the sensor unit 31 is mounted is fixed to a fixing member 38.
  • the fixing member 38 is rotatably supported by the support body 39 fixed to the main body 11b of the housing
  • a signal (data) detected by the sensor unit 31 constituted by a Doppler sensor is obtained as time-series (continuous) amplitude data.
  • signal analysis in the frequency domain becomes possible.
  • the Fourier transform spectrum of the signal detected by the sensor unit 31 is obtained as a waveform as shown in FIG.
  • the power level on the vertical axis in FIG. 7 is indicated in an arbitrary unit corresponding to the intensity (dB) of the radio wave detected by the sensor unit 31.
  • the noise level refers to the spectrum shown in FIG. 7, that is, the magnitude (power level) of a signal detected by the sensor unit 31 when the care receiver who is the detection target is not in the living room 101.
  • the sensor unit 31 detects the respiratory state of the care recipient sleeping on the bed 102 in the living room 101
  • the Fourier transform spectrum of the detection signal has a waveform as shown in FIG.
  • the spectrum is such that the respiration signal is added.
  • the ratio of the signal level at the breathing frequency (about 0.2 Hz (around 12 times / minute)) and the noise level becomes the S / N (signal to noise) ratio, and the larger this S / N ratio, The detection accuracy of the breathing state is increased.
  • the S / N ratio is large, not only the respiratory frequency but also its harmonic components can be detected.
  • the noise level be as small as possible than the level of the detection signal (respiration signal) of the biological information of the care recipient. That is, in order to increase the detection accuracy of the sensor unit 31, it is necessary to reduce the noise level detected by the sensor unit 31 as much as possible.
  • the clutter signal is a received wave that has not been Doppler shifted, that is, a received wave having the same frequency as the radiated radio wave (transmitted wave).
  • a Doppler sensor is a sensor that detects a reflected wave that is reflected back by a moving object, but the transmitted wave is also a radio wave, so it is directly reflected by a stationary object that is not moving and received by the sensor. There are also reflected waves.
  • the directly reflected wave is called a clutter signal.
  • a clutter cancel circuit is built in the Doppler sensor and has a function of canceling the clutter signal by electrical processing using a filter or the like.
  • a clutter signal exceeding the capacity that can be canceled by the clutter cancellation circuit is generated.
  • FIG. 9 schematically shows several generation paths of clutter signals generated inside the moving object detection unit 10 shown in FIG.
  • (1) A path A in which a radio wave transmitted from the transmission antenna of the sensor unit 31 directly enters (leaks) into the reception antenna.
  • (2) The radio wave transmitted from the transmission antenna of the sensor unit 31 is reflected by the surface 32a on the sensor unit 31 side of the radome lens 32, which is a stationary object located in the very vicinity of the transmission antenna, and directly enters the sensor unit 31.
  • Path B (3)
  • a path C in which the radio wave transmitted from the transmission antenna of the sensor unit 31 is reflected by the inner surface of the front cover 11a of the housing 11 that is a stationary object located in the vicinity of the transmission antenna and directly enters the sensor unit 31.
  • the influence of the clutter signal generated in the path C has the greatest influence on the noise compared to the clutter signal generated in the other paths. This is suppressed to some extent by the clutter signal generated in the route A and the route B by the design of the sensor unit 31 and the design of the radio wave detection unit 30 (including the setting of the positional relationship between the sensor unit 31 and the radome lens 32). Although the relative positional relationship between the sensor unit 31 and the front cover 11a is not fixed for the clutter signal generated in the path C (the direction of the sensor unit 31 varies depending on the position of the bed 102 in the living room 101). To control) by design.
  • FIG. 10 schematically shows the relationship between the magnitude of the respiratory signal detected by the sensor unit 31 and the noise level.
  • the upper diagram shows a case where the noise level is relatively low, and the lower diagram shows noise.
  • the case where the level is relatively large is shown.
  • the “magnitude of the respiratory signal” on the horizontal axis represents a respiratory detection spectrum (for example, a respiratory frequency (near 0.2 Hz) in the Fourier transform spectrum of the detection signal shown in FIG. This corresponds to the integrated value (area) in the respiration frequency band of 0.5 Hz, and the person with a small respiration signal (for example, an elderly person) is to the left of the center of the horizontal axis (the person with a normal respiration signal magnitude).
  • a person with a large respiratory signal (for example, a young person) is distributed on the right side with respect to the center of the horizontal axis.
  • the “frequency” on the vertical axis corresponds to the total number (frequency) of people indicating the magnitude of a certain respiratory signal.
  • the noise level shown in FIG. 10 is equivalent to the integral value in the said respiration detection area of the signal detected by the sensor part 31 when it is unattended.
  • the respiratory signal can be detected even if the respiratory signal is small (the respiratory signal is not reported). .
  • the respiratory signal below the noise level is buried in the noise level, so that the respiratory signal cannot be detected (the respiratory signal is lost). ). Therefore, in order to increase the detection accuracy of the respiratory signal, it is necessary to suppress an increase in noise level due to the clutter signal.
  • FIG. 11 is a Fourier transform spectrum of a signal detected by the sensor unit 31 when there is no cared person in the living room 101, and shows a case where the clutter signal is large and a case where the clutter signal is small. Since noise generated by the clutter signal is white noise generated at all frequencies, when the clutter signal is large, the spectrum is such that the entire power level is offset upward compared to when the clutter signal is small.
  • FIG. 12 shows a Fourier transform spectrum of the detection signal when the respiratory signal of the care recipient is acquired, and shows a case where the clutter signal is larger than the power level of the respiratory signal to be detected. As shown in the figure, when the level of the respiratory signal to be detected is lower than the noise level raised by the clutter signal, the respiratory signal to be detected is buried in the noise, so that the respiratory signal cannot be detected.
  • the above clutter signal is considered to be a composite wave of a transmission wave and a reflected wave, similarly to the wave interference phenomenon.
  • the synthesized wave becomes stronger or weaker depending on the position of the fixed end.
  • the fixed end corresponds to the radome lens 32 (surface 32a) or the front cover 11a of the housing 11 shown in FIG. Therefore, the clutter signal is strengthened or weakened depending on the positional relationship between the radome lens 32 and the front cover 11a and the sensor unit 31 (particularly the transmission antenna). That is, as shown in the upper diagram of FIG.
  • FIG. 14 schematically shows the orientation of the sensor unit 31 that changes in accordance with the positions of the plurality of beds 102 in the living room 101.
  • the vertical direction perpendicular to the ceiling 101a (horizontal plane) is defined as a reference (0 °)
  • the pitch angle ⁇ of the sensor unit 31 from the vertical direction here, the angle of the main axis of the radome lens 32 (the radome angle)).
  • the care support system 1 in order to detect the respiratory state of the cared person P lying on the bed 102 by the sensor unit 31 while the cared person P is sleeping, the inside of the moving object detection unit 10 installed in the ceiling part 101a The sensor unit 31 is operated in the direction of the bed 102.
  • the relative positional relationship (relative distance) between the sensor unit 31 (especially the transmission antenna) and the radome lens 32 changes.
  • the relative positional relationship (relative distance) between the sensor unit 31 and the front cover 11a changes. This depends on the position of the bed 102 installed in the living room 101 (depending on the distance between the moving object detection unit 10 and the bed 102 and the direction of the bed 102 as viewed from the moving object detection unit 10), and the sensor unit 31 and the front cover 11a. This means that the relative distance between and changes.
  • FIG. 15 shows an example of the relationship between the radome angle and the noise level.
  • the radiation frequency (transmission wave frequency) of the radio wave from the sensor unit 31 is constant at A (Hz).
  • the noise level on the vertical axis indicates the integral value of the breath detection interval in the Fourier transform spectrum of the signal detected by the sensor unit 31 when unattended. Since each of the radome angles ⁇ 1 to ⁇ 4 has a different relative distance between the sensor unit 31 and the front cover 11a, it can be seen that the noise level changes according to the radome angle as shown in FIG. In other words, the noise level depends on the radome angle.
  • the detected noise level varies (varies) depending on the positional relationship between the moving body detection unit 10 and the bed 102 (the direction of the set sensor unit 31), and the micro body movement detection is performed depending on the direction of the sensor unit 31. There will be a difference in ability.
  • the amplitude of the synthesized wave is 30 to 40% smaller than that of the transmission wave (or reflected wave) than when the radiation frequency is A. This is because the phase of the transmission wave at the fixed end position is changed by changing the radiation frequency.
  • FIG. 17 shows the radome angle dependence of the noise level at different radiation frequencies A and B.
  • the noise level increases as the radome angle increases.
  • the noise level decreases as the radome angle increases. ing.
  • the noise level is minimum at the radiation frequency A, and when the radome angle is ⁇ 3 and ⁇ 4, the noise level is minimum at the radiation frequency B.
  • a table defining the radiation frequency (specific radiation frequency) that minimizes the noise level for each radome angle is stored in the memory, and the specific radiation frequency corresponding to the set radome angle is obtained from the table.
  • the radiation frequency of the radio wave from the sensor unit 31 is controlled based on such a concept.
  • the characteristic configuration of the care support system 1 of the present embodiment will be described as specific examples 1 to 3.
  • FIG. 18 is a block diagram illustrating a configuration of the care support system 1 of the first specific example.
  • the radio wave detection unit 30 described above further includes a storage unit 35, a radiation control unit 36, and an interface unit 37 in addition to the sensor unit 31, the radome lens 32, and the like.
  • the interface unit 37 is an interface for inputting / outputting information or control signals to / from the unit control unit 40, and includes an input / output port (terminal).
  • the storage unit 35 can detect biological information based on the noise level detected by the sensor unit 31 by the emission of radio waves for each different direction (here, radome angle) of the sensor unit 31 in the housing of the moving object detection unit 10.
  • This is a memory for storing a table defining a specific radiation frequency that is smaller than a predetermined level (for example, the noise level is minimized).
  • the storage unit 35 is composed of, for example, a RAM, a ROM, a nonvolatile memory, and the like.
  • FIG. 19 shows an example of a table stored in the storage unit 35.
  • FIG. 20 shows an example of the specific radiation frequency obtained based on the radome angle dependence of the noise level shown in FIG.
  • the radome angles ⁇ 1 and ⁇ 2 have the minimum noise level at the radiation frequency A
  • the radome angles ⁇ 3 and ⁇ 4 have the minimum noise level at the radiation frequency B. It has become. Therefore, in the specific example 1, as shown in FIGS. 19 and 20, the radiation frequency A is set as the specific radiation frequency for the radome angles ⁇ 1 and ⁇ 2, and the radiation frequency B is specified for the radome angles ⁇ 3 and ⁇ 4.
  • the frequency is set.
  • the storage unit 35 stores a table (radiation frequency setting table) indicating the correspondence between the radome angle and the specific radiation frequency.
  • the radiation control unit 36 is a control unit that controls the radiation frequency of the radio wave in the sensor unit 31, and is configured by a CPU, for example.
  • the radiation control unit 36 can obtain the radiation frequency of the radio wave radiated from the sensor unit 31 based on the table stored in the storage unit 35 according to the setting of the direction of the sensor unit 31. Switch to a specific radiation frequency corresponding to the direction (radome angle).
  • the radiation control unit 36 refers to the above table and specifies the specific radiation frequency (corresponding to the radome angle ⁇ 3).
  • the radiation frequency B) is grasped, and the radiation frequency is switched from the specific radiation frequency (radiation frequency A) corresponding to the radome angle ⁇ 2 to the specific radiation frequency (radiation frequency B) corresponding to the radome angle ⁇ 3.
  • the sensor part 31 radiates
  • whether or not the radome angle has been changed can be determined by the radiation control unit 36 by using image recognition of the captured image. That is, in the configuration in which the moving body detection unit 10 includes the optical detection unit 23 and the image recognition unit 25, image recognition (the shape of the bed 102) by the image recognition unit 25 is obtained from an image acquired by the optical detection unit 23 by photographing the inside of the living room 101. Recognition) allows the shape and position of the bed 102 to be recognized, whereby the sleeping place of the care recipient can be identified in the image. If the sleeping place can be specified in the image, the angle of view corresponding to the sleeping place, that is, the angle of view in the vertical direction and the horizontal direction of the sleeping place (position of the bed 102) in the image can be known.
  • the sensor unit 31 is installed in the ceiling 101a of the living room 101 as the moving body detection unit 10 together with the optical detection unit 23, and the direction of the sensor unit 31 is directed toward the bed 102, so that it corresponds to a sleeping place in the image.
  • the angle of view may be considered to indicate the direction of the bed 102 as viewed from the moving object detection unit 10, that is, the direction of the sensor unit 31. Therefore, the radiation control unit 36 can determine the presence / absence of a change in the orientation of the sensor unit 31 (a change in the radome angle) using image recognition of the captured image.
  • the radiation frequency of the radio wave radiated from the sensor unit 31 is based on the table and the specific radiation corresponding to the direction of the sensor unit 31. Switch to frequency.
  • the noise level detected by the sensor unit 31 is minimized. Therefore, even when the biological information signal (breathing signal) to be detected is small, the signal can be reliably detected in a state where noise including clutter is reduced from the beginning. Therefore, the noise can be reduced and the detection accuracy in the sensor unit 31 can be increased without performing post-processing for subtracting the clutter signal as in the prior art.
  • the detected noise level is minimized in any direction of the sensor unit 31, it is possible to suppress variation in detection performance depending on the direction of the sensor unit 31.
  • the clutter signal that is the main factor of the noise level includes radio waves that directly enter the sensor unit 31 through other paths (for example, radio waves that satisfy resonance conditions). It is. However, in the specific example 1, since the specific radiation frequency that minimizes the entire noise level is set including the noise caused by such a direct incident wave, the switching to the specific radiation frequency causes all routes to be changed. The generated clutter signals can be collectively reduced to reduce the overall noise, thereby reliably increasing the detection accuracy of the sensor unit 31.
  • the moving object detection unit 10 includes the storage unit 35 and the radiation control unit 36 described above, the moving object detection unit 10 alone (without depending on an instruction from the management server 100a) can perform internal processing of the moving object detection unit 10. Thus, switching to the specific radiation frequency according to the setting of the orientation of the sensor unit 31 can be performed.
  • the radiation control unit 36 is based on the angle of view corresponding to the sleeping place (the position of the bed 102) in the captured image.
  • the orientation of the sensor unit 31 can be grasped.
  • the radiation control unit 36 can automatically switch the radiation frequency of the radio wave radiated from the sensor unit 31 to the specific radiation frequency corresponding to the direction of the sensor unit 31 with reference to the table. That is, it becomes possible for the moving body detection unit 10 (the radio wave detection unit 30) itself to switch the radiation frequency of the sensor unit 31 to the specific radiation frequency using the change or setting of the direction of the sensor unit 31 as a trigger.
  • the radome lens 32 of the radio wave detection unit 30 is integrally provided via the sensor unit 31 and the holding unit 34, the direction of the sensor unit 31 together with the radome lens 32 depends on the position of the bed 102. Even if it changes, the detection accuracy in the sensor unit 31 can be increased by switching to the specific radiation frequency while appropriately controlling the directivity of the radio wave by the radome lens 32, and the orientation of the sensor unit 31 Variations in detection performance due to can be reduced.
  • the table stored in the storage unit 35 defines a specific radiation frequency that minimizes the noise level for each different direction (radome angle) of the sensor unit 31 in the housing 11 (see FIG. 19).
  • the radiation control unit 36 refers to the above table and switches the radiation frequency to a specific radiation frequency corresponding to the direction of the sensor unit 31, thereby minimizing the noise level detected by the sensor unit 31 due to radio wave radiation. .
  • a signal for example, a respiratory signal
  • the specific radiation frequency stored in the table is not limited to the radiation frequency that minimizes the noise level.
  • the specific radiation frequency may be a radiation frequency such that the noise level detected by the sensor unit 31 is smaller than a predetermined level at which biological information can be detected.
  • FIG. 21 shows another example of the specific radiation frequency set for each radome angle.
  • the noise level (Fourier) detected by the sensor unit 31 even at the radiation frequency P (Hz) between the radiation frequency A and the radiation frequency B at the radome angles ⁇ 1 and ⁇ 2. If the integral value of the respiration detection section in the converted spectrum is smaller than a predetermined level Nth at which biological information can be detected, such a radiation frequency P may be set as the specific radiation frequency.
  • the noise level detected by the sensor unit 31 is higher than the predetermined level Nth. If it becomes smaller, such a radiation frequency Q may be set as the specific radiation frequency.
  • the noise level increases at radome angles ⁇ 1 and ⁇ 2 compared to the radiation frequency A, and at the radiation frequency Q, the noise level increases at radome angles ⁇ 3 and ⁇ 4 compared to the radiation frequency B.
  • these noise levels are both lower than the predetermined level Nth at which the biological information can be detected and lower than the level of the respiratory signal to be detected, the noise level is lower than the level of the respiratory signal as shown in FIG. Largely, the detection accuracy of the respiration signal can be improved as compared with the case where the respiration signal is buried in the noise level.
  • the bed 102 in the living room 101 is assumed as a sleeping place of the care recipient, but the care receiver who does not install the bed 102 in the living room 101 and sleeps with a futon on the floor,
  • the futon may be considered as a sleeping place.
  • the radiation control unit 36 grasps the orientation of the sensor unit 31 based on the angle of view corresponding to the sleeping place in the image. can do.
  • the storage unit 35 and the radiation control unit 36 of the radio wave detection unit 30 may be provided in the unit control unit 40, and the storage unit 24 and the main control unit 41 of the unit control unit 40 are the storage units described above. 35 and the function of the radiation control unit 36 may also be used.
  • FIG. 22 is a block diagram illustrating a configuration of the care support system 1 of the second specific example.
  • the table described in the first specific example is stored in the management server 100a of the care support system 1, and a request for switching to the specific radiation frequency grasped from the above table is sent from the management server 100a to the moving object detection unit 10 side.
  • the radiation frequency of the sensor unit 31 is switched based on this switching request. More details are as follows.
  • the radio wave detection unit 30 of the care support system 1 has the same configuration as that of the specific example 1 except that the storage unit 35 is omitted from the radio wave detection unit 30 of the specific example 1 illustrated in FIG.
  • a radiation control unit 36 and an interface unit 37 are provided.
  • the radiation control unit 36 controls the radiation of the radio wave in the sensor unit 31, but differs from the first specific example in that the radio wave radiation is controlled based on a control signal from a management control unit 111 (to be described later) of the management server 100 a. ing.
  • the management server 100a includes a management control unit 111, a storage unit 112, an input unit 113, and an interface unit 114.
  • the interface unit 114 is an interface for inputting / outputting information or control signals to / from the unit control unit 40 via the communication line 200, and includes an input / output port (terminal).
  • the management control unit 111 includes a CPU that controls the operation of each unit of the management server 100a.
  • storage part 112 is a memory which memorize
  • the input unit 113 includes, for example, a keyboard, a mouse, a touch panel, and the like, and is provided for inputting information regarding the orientation of the sensor unit 31.
  • a system user owns (mobile) an external terminal 300 that can wirelessly communicate with the management server 100a via the communication line 200. Accordingly, the user can provide various information to the management server 100a via the external terminal 300.
  • the external terminal 300 for example, a terminal having at least an input unit such as a multifunctional portable terminal such as a tablet or a smartphone or a notebook personal computer can be assumed.
  • the system user when the radome angle is changed in accordance with the change of the position of the bed 102 in the living room 101, the system user can input the changed radome angle by the input unit 113 of the management server 100a.
  • the external terminal 300 inputs the changed radome angle and transmits the information to the management server 100a.
  • the management control unit 111 refers to the table stored in the storage unit 112, obtains the specific radiation frequency corresponding to the input radome angle, and requests a control signal (setting command) for switching to the obtained specific radiation frequency. ) Is transmitted to the moving object detection unit 10.
  • the moving body detection unit 10 receives the control signal, and the radiation control unit 36 switches the radiation frequency of the radio wave radiated from the sensor unit 31 to the specific radiation frequency based on the control signal. Thereby, the sensor part 31 radiates
  • the management control unit 111 transmits a control signal for requesting switching to a specific radiation frequency obtained based on the table to the moving object detection unit 10, and in response to this, the radiation control unit 36 of the moving object detection unit 10
  • the radiation frequency of the sensor unit 31 is switched to the specific radiation frequency. Therefore, in the configuration in which the management server 100 manages the radiation frequency of the sensor unit 31, the detection accuracy at the sensor unit 31 can be increased, and variation in detection performance due to the orientation of the sensor unit 31 can be reduced. The effect of can be obtained.
  • the management control unit 111 uses the sensor in the storage unit 112 based on the table. A specific radiation frequency corresponding to the direction of the unit 31 is obtained, and a control signal for requesting switching to the specific radiation frequency is transmitted to the moving object detection unit 10.
  • the management control unit 111 can grasp the direction of the sensor unit 31 based on the information input from the input unit 113 or the information received from the external terminal 300, thereby obtaining the specific radiation frequency corresponding to the direction of the sensor unit 31. It can be determined based on a table. Therefore, the management control unit 111 can request the moving object detection unit 10 to switch to an appropriate specific radiation frequency (transmission of a control signal).
  • the management server 100a may grasp the direction of the sensor unit 31. That is, the information acquired by the optical detection unit 23 and the image recognition unit 25 (the captured image and the sleeping place information specified in the image) is transmitted to the management server 100a, and the management control unit 111 is based on the information.
  • the angle of view corresponding to the sleeping place in the image and the orientation of the sensor unit 31 may be grasped.
  • the management control part 111 calculates
  • the management server 100 a (management control unit 111) does not receive any information regarding the orientation of the sensor unit 31 from the input unit 113 or the external terminal 300.
  • the direction of the unit 31 is grasped, and the specific radiation frequency corresponding to the direction of the sensor unit 31 can be obtained based on the table.
  • the management control unit 111 can make a request for switching to an appropriate specific radiation frequency (transmission of a control signal) to the moving object detection unit 10.
  • the care support system 1 of the specific example 3 is the care support system 1 of the specific example 1 or 2 except that the table stored in the storage unit (the storage unit 35 of the radio wave detection unit 30 or the storage unit 112 of the management server 100a) is different. It is the same.
  • FIG. 23 illustrates an example of a table stored in the storage unit of the care support system 1 according to the third specific example.
  • the angle defining the direction of the sensor unit 31 is only the radome angle, but strictly speaking, it is necessary to consider the radome rotation angle.
  • the radome rotation angle corresponds to the yaw angle when the sensor unit 31 rotates with the direction perpendicular to the horizontal plane (ceiling 101a) as the rotation axis.
  • the radome angle described above corresponds to a pitch angle when the sensor unit 31 rotates with a direction parallel to the horizontal plane as a rotation axis.
  • the radome rotation angle changes, depending on the shape of the front cover 11a of the housing 11, the relative positional relationship (relative distance) between the sensor unit 31 and the front cover 11a changes, and as a result, depending on the radome rotation angle.
  • the noise level changes.
  • both the radome rotation angle and the radome angle are considered as the angles that define the direction of the sensor unit 31, and noise is detected for each direction of the sensor unit 31 defined by both the radome rotation angle and the radome angle.
  • a specific radiation frequency that minimizes the level is set in advance, and the correspondence relationship is stored as a table in the storage unit (storage unit 35 or storage unit 112).
  • the specific radiation frequency corresponding to the set direction of the sensor unit 31 is obtained from the table, and the sensor unit 31 is driven at the obtained specific radiation frequency (the radiation frequency is switched) as in the first or second example.
  • the sensor unit Improvement of detection accuracy in the sensor unit 31 by realizing switching to an appropriate specific radiation frequency according to the direction of the sensor unit 31 regardless of the direction in the room 101 in which the direction of the 31 is a three-dimensional space
  • the radio wave detection part 30 has the radome lens 32
  • the radome lens 32 should just be provided as needed, and installation of the radome lens 32 is also omissible.
  • the direction of the sensor unit 31 may be a direction perpendicular to the substrate 33 on which the sensor unit 31 is mounted.
  • the above-described “radome angle” may be read as “the pitch angle of the sensor unit 31”
  • “radome rotation angle” may be read as “the yaw angle of the sensor unit 31”.
  • the orientation of the sensor unit 31 after the change is grasped by image recognition (refer to specific example 1) or manual input (refer to specific example 2), but after the change using a pitch angle sensor or the like.
  • the direction (angle) of the sensor unit 31 may be read, and thereby the specific radiation frequency corresponding to the direction of the sensor unit 31 may be obtained based on a table.
  • the care support system described in the present embodiment is disposed in a casing of a moving body detection unit installed in a subject's room, and detects a biological information of the subject by emitting and receiving radio waves, A noise level detected by the sensor unit for each of different directions of the radiation control unit for controlling the radiation frequency of the radio wave and the sensor unit in the housing is smaller than a predetermined level at which the biological information can be detected.
  • a storage unit that stores a table that defines a specific radiation frequency such that the radiation control unit determines the radiation frequency of the radio wave radiated from the sensor unit according to the setting of the orientation of the sensor unit, The specific radiation frequency corresponding to the direction of the sensor unit obtained based on the table is switched.
  • the radiation control unit switches the radiation frequency of the radio wave radiated from the sensor unit to the specific radiation frequency obtained based on the table according to the setting of the direction of the sensor unit.
  • the moving object detection unit may include the radiation control unit and the storage unit. In this case, even if there is no instruction from the outside (for example, the management server), switching to a specific radiation frequency corresponding to the direction of the sensor unit is performed by internal processing of the motion detection unit (by itself). Can do.
  • the moving body detection unit captures an image of a living room and acquires an image, and identifies a sleeping place by recognizing the position of a bed or a futon in the living room by image recognition from the image acquired by the imaging unit.
  • An image recognizing unit configured to recognize the orientation of the sensor unit based on an angle of view corresponding to the sleeping place in the image acquired by the imaging unit, and the sensor
  • the radiation frequency of the radio wave radiated from the unit may be switched to the specific radiation frequency corresponding to the direction of the sensor unit obtained based on the table.
  • the position (sleeping place) of the bed or the like can be specified by image recognition from the image acquired by photographing the living room, and thereby the bedtime in the image You can see the vertical and horizontal (shooting) angle of view of the place.
  • the sensor unit is provided in the moving body detection unit together with the imaging unit, and is usually installed in the unit in the direction of the sleeping place for the purpose of detecting a breathing state while the subject is sleeping. It may be considered that the angle of view corresponding to the sleeping place indicates the direction of the sensor unit.
  • the radiation control unit grasps the direction of the sensor unit from the angle of view every time the sensor unit is set (adjusted), even if no information on the direction of the sensor unit is input from the outside. It is possible to automatically switch to a specific radiation frequency corresponding to the direction.
  • the system further includes a management server that manages information output from the moving object detection unit, the moving object detection unit includes the radiation control unit, and the management server stores the storage unit and the storage unit.
  • a management control unit that transmits a control signal that requests switching to the specific radiation frequency obtained based on the table to the moving object detection unit, and the radiation control unit of the moving object detection unit includes the management control Based on the control signal transmitted from the unit, the radiation frequency of the radio wave radiated from the sensor unit may be switched to the specific radiation frequency.
  • the management server Since the management server has a storage unit that stores the table, it is not necessary to provide a large-capacity memory in the motion detection unit, and the manufacturing cost and size of the motion detection unit can be reduced. Further, the management control unit of the management server transmits a control signal requesting switching to the specific radiation frequency obtained based on the table to the moving object detection unit, and the radiation control unit of the moving object detection unit is based on the control signal. The radiation frequency of the sensor unit is switched to the specific radiation frequency. Therefore, in the configuration in which the management server (particularly, the management control unit) manages the radiation frequency of the sensor unit, the above-described effects can be obtained, for example, the detection accuracy at the sensor unit can be increased without performing a subtraction process.
  • the management server includes an input unit for inputting information related to the orientation of the sensor unit, and the management control unit is configured to input the sensor unit based on the table when the information is input by the input unit.
  • the specific radiant frequency corresponding to the direction may be obtained, and the control signal may be transmitted to the moving object detection unit.
  • the management control unit can grasp the direction of the sensor unit from the information input by the input unit, and can obtain the specific radiation frequency corresponding to the direction of the sensor unit based on the table. As a result, the management control unit can make a request for switching to an appropriate specific radiation frequency (transmission of a control signal) to the moving object detection unit.
  • the management control unit obtains the specific radiation frequency corresponding to the direction of the sensor unit based on the table when receiving information on the direction of the sensor unit from an external terminal capable of communicating with the management server.
  • the control signal may be transmitted to the moving object detection unit.
  • the management control unit grasps the direction of the sensor unit from the information received from the external terminal (for example, a multi-function mobile terminal), and obtains the specific radiation frequency corresponding to the direction of the sensor unit based on the table. it can. As a result, the management control unit can make a request for switching to an appropriate specific radiation frequency (transmission of a control signal) to the moving object detection unit.
  • the moving body detection unit captures an image of a living room and acquires an image, and identifies a sleeping place by recognizing the position of a bed or a futon in the living room by image recognition from the image acquired by the imaging unit.
  • An image recognizing unit that further includes an angle of view corresponding to the sleeping place in the image based on the image and the sleeping place information output from the moving body detection unit.
  • the direction of the sensor unit may be grasped, the specific radiation frequency corresponding to the direction of the sensor unit may be obtained based on the table, and the control signal may be transmitted to the moving object detection unit.
  • the position (sleeping place) of the bed or the like can be specified by image recognition from the image acquired by photographing the living room, and thereby the bedtime in the image You can see the vertical and horizontal (shooting) angle of view of the place.
  • the sensor unit is provided in the moving body detection unit together with the imaging unit, and is usually installed in the unit in the direction of the sleeping place for the purpose of detecting a breathing state while the subject is sleeping. It may be considered that the angle of view corresponding to the sleeping place indicates the direction of the sensor unit.
  • the management server (management control unit) is based on information (captured image and sleeping place information) output from the motion detection unit even if no information on the orientation of the sensor unit is input from the input unit or the external terminal.
  • information captured image and sleeping place information
  • the management control unit can make a request for switching to an appropriate specific radiation frequency (transmission of a control signal) to the moving object detection unit.
  • the angle that defines the orientation of the sensor unit is a yaw angle when the sensor unit rotates with a direction perpendicular to the horizontal plane as a rotation axis, and when the sensor unit rotates with a direction parallel to the horizontal plane as a rotation axis.
  • the pitch angle may be included.
  • the direction of the sensor unit is three-dimensionally defined using the yaw angle and the pitch angle, the direction of the sensor unit is the same regardless of the direction of the sensor unit in the room that is a three-dimensional space.
  • the system may further include a radome lens that is provided integrally via the sensor unit and the holding unit and controls the directivity of the radio wave radiated from the sensor unit.
  • a radome lens that is provided integrally via the sensor unit and the holding unit and controls the directivity of the radio wave radiated from the sensor unit.
  • the table may define the specific radiation frequency that minimizes the noise level for each different direction of the sensor unit in the housing. Switching to a specific radiation frequency corresponding to the direction of the sensor unit minimizes the noise level detected by the sensor unit due to radio wave radiation. Therefore, a signal to be detected by the sensor unit (a detection signal of biological information to be observed) ) Can be acquired reliably.
  • the present invention can be used for a care support system that supports the daily life of a subject such as a care recipient in a living room.

Abstract

Ce système d'aide aux soins comprend un ensemble capteur, une unité de commande d'émission et une unité de stockage. L'ensemble capteur est disposé dans un boîtier d'une unité de détection de corps mobile installée dans une pièce d'un sujet, et détecte des informations biologiques relatives au sujet par émission et réception d'ondes radio. L'unité de stockage stocke un tableau précisant, pour chacune d'une pluralité d'orientations différentes de l'ensemble capteur dans le boîtier, une fréquence d'émission spécifique à laquelle un niveau de bruit détecté par l'ensemble capteur est inférieur à un niveau prédéterminé auquel les informations biologiques peuvent être détectées. L'unité de commande d'émission commute la fréquence d'émission des ondes radio émises par l'ensemble capteur sur la fréquence d'émission spécifique qui correspond à l'orientation de l'ensemble capteur, et qui est obtenue sur la base du tableau, conformément au réglage de l'orientation de l'ensemble capteur.
PCT/JP2018/014461 2017-05-25 2018-04-04 Système d'aide aux soins WO2018216362A1 (fr)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62189803A (ja) * 1986-02-14 1987-08-19 Matsushita Electric Works Ltd アンテナド−ム
WO2016140186A1 (fr) * 2015-03-05 2016-09-09 コニカミノルタ株式会社 Système de surveillance
JP2016209327A (ja) * 2015-05-11 2016-12-15 沖電気工業株式会社 睡眠深度推定装置、睡眠深度推定方法、およびプログラム

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62189803A (ja) * 1986-02-14 1987-08-19 Matsushita Electric Works Ltd アンテナド−ム
WO2016140186A1 (fr) * 2015-03-05 2016-09-09 コニカミノルタ株式会社 Système de surveillance
JP2016209327A (ja) * 2015-05-11 2016-12-15 沖電気工業株式会社 睡眠深度推定装置、睡眠深度推定方法、およびプログラム

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