JP2018197910A - Biometric measurement device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a biological measuring device which can easily detect a pulse wave or the like of a subject and does not interfere with the movement of the subject when detecting the pulse wave or the like. SOLUTION: A subject's face is irradiated with near-infrared light from a light emitting element, a subject's pulse wave is acquired from an image of the subject's face taken by a camera at this time, and the state of the subject is obtained based on the pulse wave. To judge. In addition, the pulse wave analysis location is identified from the image of the subject's face taken by the camera with the near-infrared light emitted by the light emitting element, and another light emitting element having a higher luminosity than this light emitting element is assigned to the pulse wave analysis location at different timings. By irradiating with near-infrared light, the pulse wave of the subject is acquired from the image of the pulse wave analysis location, and the state of the subject is determined based on this pulse wave. [Selection diagram] Fig. 1

Description

  The present invention relates to a biometric apparatus that measures the state of a human being (subjective state, excitement state, etc.) as a subject.

As a conventional biometric device, there is a driving support device disclosed in Patent Document 1. That is, the vehicle 1 is equipped with a driver camera for photographing the driver's face. Images taken by the driver camera are input to the control device. When taking an image of the driver's face, light having a wavelength in the near infrared region is mainly used.
Furthermore, the driver wears an electrocardiographic sensor and a blood pressure sensor, and data such as the heart rate and blood pressure of the driver are input to the control device wirelessly or by wire.

  The control device detects the state of the driver based on data such as the driver's face image data, heart rate, and blood pressure. As a result, for example, when it is determined that the driver is in an ambiguous state, various sounds and sound effects are output from the speaker. Alternatively, the driver is alerted by driving a seat vibration device built in the seat of the driver's seat.

Japanese Patent Laying-Open No. 2015-153048

In the above-mentioned Patent Document 1, a sensor or the like is attached to a subject, and the attached sensor or the like detects the subject's pulse wave or the like. Therefore, since it is necessary to attach a sensor or the like to the subject, it takes time and effort to attach the sensor or the like, and there is a possibility that the operation of the subject is limited. For example, during driving of a car, the subject (driver) may not be able to operate a sudden handle or the like by attaching a sensor or the like to the subject (driver).
As described above, in the conventional device, for example, detecting a pulse wave of a subject (driver) while driving a vehicle has a problem that a safe driving of the vehicle is hindered.

  The present invention has been made in order to solve the above-described problems, and provides a biometric device that can easily detect a subject's pulse wave and the like and that does not interfere with the operation of the subject when detecting the pulse wave or the like. The purpose is to provide.

  In order to achieve the above object, in the present invention, a camera that captures a face of a subject, a light emitting element that irradiates near infrared light on the face of the subject when the camera captures the face of the subject, There is provided a biometric apparatus including an arithmetic device that acquires a pulse wave of the subject from an image of the face of the subject photographed by a camera and determines the state of the subject based on the pulse wave.

  In order to achieve the above object, according to the present invention, a camera that shoots the face of the subject and a first infrared light that irradiates the subject's face with near infrared light when the camera shoots the face of the subject. Photographed with the camera by a light emitting element, a second light emitting element that irradiates the face of the subject with near infrared light having a higher luminous intensity than the first light emitting element, and near infrared light by the first light emitting element. By identifying the pulse wave analysis location from the face image of the subject and irradiating the pulse wave analysis location with the near infrared light of the second light emitting element at a timing different from the first light emitting element, There is provided a biometric device comprising: an arithmetic device that acquires the pulse wave of the subject from the image of the pulse wave analysis location photographed by the camera and determines the state of the subject based on the pulse wave. .

  According to the present invention, the subject's face is irradiated with near-infrared light from the light emitting element, and the subject's pulse wave is acquired from the image of the subject's face taken by the camera at this time, and the subject is based on the pulse wave. Therefore, it is possible to easily detect a pulse wave of a driver or the like without disturbing the operation of the subject.

It is a block diagram which shows the structure of Embodiment 1 of the biometric apparatus by Embodiment 1 of this invention. It is a perspective view which shows the external appearance structure of the biometric apparatus shown in FIG. It is a flowchart which shows schematic operation | movement of the biometric apparatus shown in FIG. It is the flowchart which showed the acquisition method of the pulse wave data in the flowchart of FIG. It is a block diagram which shows the structure of the biometric apparatus by Embodiment 2 of this invention. It is a perspective view which shows the external appearance structure of the biometric apparatus shown in FIG. It is a flowchart which shows schematic operation | movement of the biometric apparatus shown in FIG. It is a timing chart which shows the relationship between the image pick-up element in the biometric apparatus shown in FIG. 5, and operation | movement of near infrared LED. It is the flowchart which showed the flowchart of FIG. 7 in detail.

  Hereinafter, various embodiments of a biometric apparatus according to the present invention will be described with reference to the accompanying drawings. In addition, this biometric apparatus shall be mounted in vehicles, such as a mobile body, for example, a motor vehicle. Accordingly, the subject is, for example, a vehicle driver.

Embodiment 1 FIG.
In FIG. 1, a biometric apparatus 8 shown as the first embodiment includes a camera 1 that captures a face photograph of a driver who is a subject, a near-infrared LED 4 that irradiates the subject's face with near-infrared light, and a subject. The external interface unit (I / F) 7 for inputting the state measurement result and external information and the arithmetic unit 10 are configured.

  The arithmetic device 10 further includes a camera control unit 2 that controls the shutter time and timing of the camera 1, and extracts a pulse wave based on the imaging data, and measures the state of the subject by analyzing the waveform to measure the state of the subject. Unit 3, LED control unit 5 that controls the emission time and timing of near-infrared LED 4, and external storage device 6 that accumulates acquired pulse wave data for pulse wave analysis.

  The camera 1 includes a lens and an image sensor such as a charge coupled device (CCD) or a complementary MOS (CMOS). In addition, in order to obtain an image in which near-infrared light is reflected, a filter (not shown) that removes a frequency of 700 nm or less that is a visible light region is provided in front of the imaging element.

Near-infrared LED4 is installed so that it may irradiate a cheek part of a test subject, and the near-infrared LED4 uses the near-infrared LED4 having a wavelength in the vicinity of 700 nm to 900 nm due to the infrared absorption characteristics of hemoglobin.
Therefore, the camera 1 is installed so as to photograph the subject's cheek area, and obtains a pulse wave by a change in luminance of the image. This change in brightness occurs due to the near-infrared absorption characteristics of hemoglobin in the blood reflected by the near-infrared LED 4 irradiated to the subject.

Since near-infrared LED4 irradiates a test subject for a long time, what meets safety standards, such as class I in JISC6802, is used, for example.
As shown in FIG. 1, the subject state measurement unit 3 controls the camera control unit 2 and the LED control unit 5 so that the timing at which the camera 1 takes an image and the timing at which the near-infrared LED 4 is turned on are the same. To do. The subject state measuring unit 3 executes a program for extracting a pulse wave from an image acquired from the camera 1 and measuring the state of the subject by pulse wave analysis. In order to execute this program, the subject state measurement unit 3 is equipped with a central processing unit (CPU), a microprocessor, or an FPGA.

The external storage device 6 includes, for example, a volatile memory or a nonvolatile memory, and has a data storage capacity for a minimum time for analyzing a pulse wave.
The external interface unit 7 has a function of performing wired or wireless communication with an external terminal as means for sending a pulse wave analysis result of the subject to the outside and receiving an operation command of the biometric device 8.

  The appearance of the biometric device 8 of FIG. 1 is shown in FIG. The biometric device 8 is mounted on one substrate, and includes a camera 1, a camera control unit 2 (not shown), a subject state measurement unit 3, a near infrared LED 4, an LED control unit 5, and an external storage device. 6 and the external interface unit 7 (not shown) perform input / output of information shown in FIG. 1 by electrical connection. Each position is adjusted in advance so that the irradiation direction of the near-infrared LED 4 and the imaging direction of the camera 1 coincide.

An outline of the operation of the biometric apparatus 8 will be described with reference to the flowchart of FIG.
First, in order to acquire an image, the test subject state measurement unit 3 emits the near-infrared LED 4 toward the test subject (step S001). Next, the face of the subject, particularly the cheek part, is imaged by the camera 1 (step S002). The captured image is input to the subject state measurement unit 3 to acquire pulse wave data (step S003). The acquired pulse wave is accumulated in the external storage device 6, and the state of the subject is measured by the state measuring unit 3 of the subject (step S004). Based on the command received from the external interface unit 7, it is determined whether to end the operation or to continue the measurement (step S005). Hereinafter, the pulse wave data may be simply referred to as a pulse wave.

  Next, the pulse wave data acquisition step S0003 in the flowchart of FIG. 3 will be described in detail with reference to the flowchart of FIG.

In FIG. 4, it is necessary to acquire images at equal time intervals in order to acquire a pulse wave. Therefore, the count of the counter (timer) 30 built in the state measurement unit 3 of the subject is first started (step S019).
Next, the subject's face is imaged by the camera 1 (step S020), and the subject's state measuring unit 3 accumulates as image data when the count is t (step S021). When there is an image one count before (count t-1) (Yes in step S022), the subject state measurement unit 3 calculates the luminance difference between the image data of both count t-1 and count t (step S023). .

  The calculated luminance difference is stored as image data in the external storage device 6 (step S024). Then, the image data of the count t is transferred to the image data storage area of the count t−1 of the subject state measurement unit 3 (step S025), and when the operation is continued (No in step S026), the counter 30 counts by one. (S027) After 1 count, the subject's face is imaged again to obtain pulse wave data.

  When there is no image data at the time of count t-1 (No in step S022), the image data of count t is transferred to the image data storage area of count t-1 of the subject state measurement unit 3 (step S025), 1 Waiting for counting (step S027), image data at the time of count t is captured and acquired as pulse wave data (steps S020 to S024).

  As shown in FIG. 4, the time for executing image acquisition, luminance difference calculation, and pulse wave data acquisition (steps S020 to S026) is within one count. Therefore, the upper limit of the shutter time of the camera 1 and the irradiation time of the near-infrared LED 4 is adjusted in advance in consideration of these.

  The state measuring unit 3 of the subject may perform waveform shaping processing after acquiring the pulse wave. For example, in order to remove disturbance noise from the acquired pulse wave, low-pass filter processing that passes only a frequency of 0.45 Hz or less is performed.

  A method for measuring the condition of a subject by analyzing a pulse wave is a known technique. As a method, the fluctuation of the pulse wave is measured. Specifically, the pulse wave is second-order differentiated, the peak interval of the pulse wave is measured, and frequency analysis or the like by fast Fourier transform or maximum entropy method is performed. The state of the subject is measured by analyzing the change in the ratio of the spectral height between the low frequency range (0.04 Hz to 0.15 Hz) and the high frequency range (0.15 to 0.45 Hz) of this frequency characteristic.

  In addition, when there is a method for measuring the state of a subject by pulse wave analysis that has already been known, these may be utilized. Furthermore, as long as the waveform processing method extracts a desired frequency, other methods may be used.

Embodiment 2. FIG.
The biometric apparatus 14 according to Embodiment 2 of the present invention shown in FIG. 5 includes a camera 1 that captures a driver's face photo, near-infrared LEDs 10a and 10b that irradiate the driver's face with near-infrared light, It comprises an external interface unit 7 for inputting a driver's state measurement result and external information, an alerting device 12 for notifying the driver when the driver's state is determined to hinder driving, and an arithmetic unit 20 Is done. In the following description, a driver will be described as an example of a subject. Therefore, the biometric device 14 in this case is also a driving support device.

  The computing device 20 further detects a camera by detecting a face, a camera control unit 2 that controls the shutter time and timing of the camera 1, an external storage device 6 that accumulates acquired pulse wave data for pulse wave analysis, and a face. Extracting pulse wave based on the data and analyzing the waveform of the subject to measure the state of the subject 9, LED output control unit to control the emission intensity, emission time and timing of the near infrared LED 4 11 and an alerting control unit 13 that controls the alerting device 12.

As in the first embodiment, the camera 1 includes a lens and an image sensor such as a charge coupled device (CCD) or a complementary MOS (CMOS).
In addition, in order to obtain an image in which near-infrared light is reflected, a filter that removes a frequency of 700 nm or less that is a visible light region is provided in front of the imaging device.

  In addition, the near-infrared LEDs 10 a and 10 b capture the driver's face with the camera 1, detect the face from the captured image, and detect near-infrared light near the cheek from the detected face. The LED output control unit 11 is controlled to irradiate. The wavelengths of near-infrared LEDs 10a and 10b are in the vicinity of 700 nm to 900 nm due to the infrared absorption characteristics of hemoglobin.

  When measuring the pulse wave, the camera 1 captures the periphery of the cheek of the driver and obtains the pulse wave by changing the luminance of the image. This change in luminance occurs due to the near-infrared absorption characteristics of hemoglobin in the blood reflected by the near-infrared LEDs 10a and 10b irradiated to the driver. For photographing around the cheek, the driver's face image is detected, and the target region (ROI) where the reflected light of the cheek is incident is set by the image sensor. Moreover, in order to irradiate towards a test subject near infrared LED10a and 10b, what satisfy | fills safety standards, such as class I in JISC6802, is used, for example.

The subject state measurement unit 9 controls the camera control unit 2 and the LED output control unit 11 so that the timing at which the camera 1 captures the image and the timing at which the near-infrared LEDs 10a and 10b are turned on simultaneously.
The external storage device 6 includes, for example, a volatile memory or a nonvolatile memory, and has a capacity for storing a result of detecting a state abnormality and a minimum time for analyzing a pulse wave.

As illustrated in FIG. 5, the subject state measurement unit 9 executes a driver state measurement program based on an image acquired from the camera 1 by detecting a face, extracting a pulse wave, and analyzing a pulse wave. In order to execute these programs, the subject state measurement unit 9 is equipped with a central processing unit (CPU), a microprocessor, or an FPGA.
In addition, as shown in FIG. 5, the subject state measurement unit 9 commands the operation of the camera control unit 2, the LED output control unit 11, and the alerting control unit 13.

  The external interface unit 7 has a function of performing wired or wireless communication with an external terminal as means for sending a pulse wave analysis result of the driver to the outside and receiving an operation command of the biometric device 8.

  The appearance of the biometric device 14 is shown in FIG. 6. The biometric device 14 is mounted on a single substrate 17, and includes a camera 1, a camera control unit 2, a subject state measurement unit 9, and a near red color. The external LEDs 10a and 10b, the LED output control unit 11, the alerting device 12 (not shown), the alerting control unit 13 (not shown), the external storage device 6, and the external interface unit 7 (not shown) Input / output of the information shown in 5 is performed by electrical connection. Further, the respective positions are adjusted in advance so that the irradiation directions of the near-infrared LEDs 10a and 10b and the imaging direction of the camera 1 coincide.

  Each of the near-infrared LEDs 10a and 10b may be provided with a plurality of LEDs in order to emit strong light when acquiring a pulse wave. When a plurality of LEDs are arranged, the near-infrared LED 10a is arranged to irradiate the entire face, and the near-infrared LED 10b is arranged to irradiate the lower half of the face. Further, although a plurality of near infrared LEDs 10b are assumed, the near infrared LEDs 10a and 10b may be used alone if the radiation intensity can be output alone.

  Next, operation | movement of the biometric apparatus 14 of this Embodiment 2 is demonstrated roughly with reference to the flowchart shown in FIG.

  First, in order to acquire an image, near infrared LED10a is light-emitted toward a driver | operator (step S006). Next, the driver's face is imaged (step S007), the imaging is stopped at the set time (step S008), and the light emission of the near infrared LED 10a is stopped after the imaging of the camera 1 is stopped (step S009). The face of the driver's captured image is detected by the subject state measurement unit 9 (step S010), and the ROI is estimated (step S011).

  Next, the near-infrared LED 10b is caused to emit light (step S012), and the driver's cheek portion is imaged by the camera 1 (step S013). The cheek image is stopped at the set time (step S014), and after the imaging is stopped, the light emission of the near infrared LED 10b is also stopped (step S015). The pulse wave data is accumulated in the external storage device 6, and the state of the driver is measured by the subject state measurement unit 9 (step S016). If necessary, the state measuring unit 9 notifies the driver of the danger by the alerting control unit 13 (step S017). Finally, it is determined whether to end the operation or continue the measurement (step S018), and the process ends.

Here, the operation of the biometric apparatus 14 shown in FIG. 7 will be described in more detail with reference to the timing chart of FIG.
FIG. 8 shows the ON / OFF timing of the near-infrared LEDs 10a and 10b and the ON / OFF timing of the image sensor of the camera 1. As shown in the figure, the timing of the imaging of the camera 1 and the near-infrared LED 10a And 10b are controlled so as to be synchronized with the light emission timing.

  Further, the acquisition of pulse wave data is performed between frames (indicated by a one-dot chain line A) in which the driver's face is imaged by the near-infrared LED 10a. Since the pulse wave is measured from the reflected light of an artery existing on the cheek, for example, an infraorbital artery or zygomatic orbital artery, the intensity of light is increased from that at the time of imaging so as to pass through the epidermis.

  Note that, as indicated by the dotted line B in FIG. 8, the pulse wave is measured by irradiating strong light from the near-infrared LED 10b, so that the camera control unit 2 reduces the sensitivity so as not to exceed the measurement upper limit of the camera 1. Control may be performed.

  Here, the pulse wave acquisition step S1013 of the biometric device 14 shown in FIG. 7 can be executed in the same manner as the flowchart of FIG. 4 described with respect to step S0003 in the above-described first embodiment. Is omitted.

  Next, the operation of the biometric device 14 will be described in detail with reference to the flowchart of FIG.

  First, the time (period) for face detection and pulse wave acquisition needs to be performed at an arbitrary equal time (period). Therefore, the counter 30 and the counter 31 incorporated in the state measurement unit 9 of the subject are started (step S028).

  When the driver's pulse wave comparison data exists in the external storage device 6 (Yes in step S029), the driver's face is detected by the camera 1 and the near-infrared LED 10a (step S030), and the driver's face is detected. If it can be detected (Yes in step S031), the driver's pulse wave is acquired by the camera 1 and the near-infrared LED 10b (step S032).

  If there is no pulse wave comparison data (No in step S029), comparison data is created before measuring the state of the driver using the pulse wave. Therefore, the driver's face is detected by the camera 1 and the near-infrared LED 10a (step S042). If the driver's face is detected (Yes in step S043), the driver's face is detected by the camera 1 and the near-infrared LED 10b. A pulse wave is acquired (step S044). It should be noted that, in the case of obtaining the pulse wave in this case, when obtaining the luminance difference as in step S023 of FIG. 4, a default value may be prepared in advance as an object to be compared.

  When the driver's face cannot be detected regardless of the presence / absence of pulse wave comparison data, the counter t2 of the counter 31 is incremented by “1” (step S050, step S051), and continuously for 3 seconds (count t2 = 90) or more. If the face cannot be detected (Yes in step S052), the risk point R is incremented by “5” (step S053).

  The pulse wave comparison data is stored in the external storage device 6 (step S045). Here, in order to equalize the time for face detection and pulse wave acquisition, the system waits for one count (step S046). After waiting, the count t1 of the counter 30 is incremented by “1”, and the count t2 of the counter 31 is reset (step S047).

  A certain amount of time is required to obtain the pulse wave comparison data, and this time, the pulse wave is acquired until the count t1 reaches 3 minutes (t1 = 5400) or more (No in step S048). When the count t1 becomes 3 minutes or more (Yes in step S048), the image comparison data is acquired, so the counter 30 is reset (step S049), and the process proceeds to step S031 and shifts to the driver state measurement. To do.

  After the transition, pulse wave data is accumulated in the external storage device 6 in order to measure the driver's condition (step S033). Here, in order to equalize the time for face detection and pulse wave acquisition, up to 1 count. Wait (step S034). After waiting, the count t1 of the counter 30 is incremented by “1”, and the counter 31 is reset (step S035).

  A certain amount of time is required to obtain the pulse wave comparison data. This time, the pulse wave is acquired until the count t1 reaches 10 seconds (t1 = 300) or more (No in step S036). When the count t1 is 10 seconds or longer (Yes in step S036), the subject's state measurement unit 9 analyzes the pulse wave (step S036).

  The presence or absence of a state risk is determined from the frequency spectrum of the pulse wave peak interval obtained from the analysis of the pulse wave (step S038). If there is a state risk (Yes in step S038), the risk is high The point R is incremented by “2” (step S039), and the risk point R is incremented by “3” (step S040) when the state is drowsiness such as sleepiness. When there is no state risk (No in step S038), the risk point R is decremented by “1” (step S041).

  If the risk point R is below “5” (Yes in step S054), the current risk point R and the pulse wave used for the analysis are stored in the external storage device 6 without warning the driver. The old data stored in the external storage device 6 is deleted from the oldest data for the stored pulse wave data (step S055).

When the risk point R is “5” or more (No in step S054), the driver is alerted by the alerting device 12 and the alerting control unit 13 (step S056).
Finally, it is determined whether to end the operation or to continue the measurement (step S057). When the operation is continued (No in step S057), the counters 30 and 31 are reset (step S058).

In the driving support flow shown in FIG. 9, the pulse wave comparison data is either to call the stored data in the external storage device 6 or to create a new one, but the pulse wave comparison data is input from the external interface unit 7. You may do it.
Further, since the pulse wave has a large individual difference, the driver's personal recognition may be performed and the individual pulse wave data specified from the external storage device 6 may be called.

  As shown in FIG. 9, a 10-second pulse wave is acquired for detecting the driver's state (step S036). This is because the period of the pulse wave on the low frequency side is about 10 seconds in the α-index method which is a state detection method. Therefore, when using another state detection method, the pulse wave acquisition time may be arbitrarily changed.

  As shown in FIG. 9, the risk point R gives a fixed arbitrary value for each risk. However, the risk point R is set in view of the risk priority of the current traffic environment. It can be changed to.

  INDUSTRIAL APPLICABILITY The present invention is suitable for a biometric device that measures the state of a subject and a driving assistance device that uses the biometric device.

  1: camera, 2: camera control unit, 3: subject state measurement unit, 4: near infrared LED, 5: LED control unit, 6: external storage device, 7: external interface unit (I / F), 8: Biometric apparatus, 9: test subject state measurement unit, 10a, 10b: near infrared LED, 11: LED output control unit, 12: alerting device, 13: alerting control unit.

In order to achieve the above object, according to the present invention, a camera that shoots the face of the subject and a first infrared light that irradiates the subject's face with near infrared light when the camera shoots the face of the subject. a light emitting element, the first and the second light-emitting element intensity from the light-emitting element irradiates the high near-infrared light to the face of the subject, the first of said light-emitting element to emit light first light emitting element the near red infrared light captured facial of the subject by the camera while illuminating, identifies cheeks of the subject from the photographed the subject facial image, the light emission of the first light emitting element After stopping, the second light emitting element is caused to emit light, and while the second light emitting element is irradiating the near-infrared light, the cheek of the specified subject is photographed with the camera and photographed. by obtaining the pulse wave of the subject from the subject's cheek in the image, the And determining arithmetic unit the status of the subject based on the wave, the biometric device equipped with is provided.

Claims (10)

A camera that captures the subject's face;
When the camera captures the face of the subject, a light emitting element that irradiates the subject's face with near infrared light; and
A biometric apparatus comprising: an arithmetic device that acquires a pulse wave of the subject from an image of the face of the subject photographed by the camera and determines the state of the subject based on the pulse wave. A camera that captures the subject's face;
A first light-emitting element that irradiates the subject's face with near-infrared light when the camera images the subject's face;
A second light emitting element that irradiates the subject's face with near infrared light having a higher luminous intensity than the first light emitting element;
The second light emitting element is identified at a timing different from that of the first light emitting element by identifying a pulse wave analysis location from an image of the face of the subject taken by the camera with near infrared light from the first light emitting element. The pulse wave of the subject is obtained from the image of the pulse wave analysis location photographed by the camera by irradiating the pulse wave analysis location with the near infrared light of the subject, and the state of the subject based on the pulse wave A biological measuring device comprising: The camera photographs the cheek of the subject's face,
The biometric apparatus according to claim 1, wherein the arithmetic device acquires the pulse wave of the subject from an image of a cheek of the face of the subject photographed by the camera. The light emitting element is a near infrared light emitting diode,
The biometric apparatus according to claim 1, wherein the camera includes a filter for obtaining a reflected image of the near-infrared light. The biometric apparatus according to claim 1 or 2, wherein the arithmetic device obtains a luminance difference between an image of the subject photographed by the camera and an image to be compared to obtain the pulse wave. The arithmetic device acquires the pulse wave of the subject within a set time when there is no pulse wave to be compared with the image of the subject photographed by the camera, and the pulse to be compared with the pulse wave. The biometric apparatus according to claim 2, wherein the biometric apparatus is used for acquiring the pulse wave thereafter. The biometric apparatus according to claim 6, wherein the arithmetic device raises a risk point used for an alarm to the subject when the pulse wave of the subject cannot be acquired within the set time. When there is a pulse wave to be compared with the image of the subject photographed by the camera, the arithmetic device uses the pulse wave to be compared to the pulse wave of the subject acquired at a set time. The biometric apparatus according to claim 6, wherein the pulse wave is analyzed based on and the risk points are adjusted according to the risk of the state. The biometric apparatus according to claim 8, wherein the arithmetic device gives an alarm to the subject when the risk point exceeds a threshold value. The biometric apparatus according to claim 1, wherein the subject is a vehicle driver.

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