JP2017205368A - Driver state detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect an abnormal state of a driver easily without using a biological information sensor.SOLUTION: A driver state detector comprises: an imaging unit which is provided in an interior of a vehicle and captures an image of a driver; a posture determination unit for determining a parietal angle, which is an inclination angle to a vertical direction of a linear line connecting a lumbar part and a parietal part of a driver, from the image of the driver captured by the imaging unit; a storage unit for storing a first threshold angle on a front inclination side and a second threshold angle on a rear inclination side which are predetermined; and a state determination unit for, when the parietal angle of the driver is outside a range from the first threshold angle on the front inclination side to the second threshold angle on the rear inclination side, determining that the driver is in an abnormal state.SELECTED DRAWING: Figure 1

Description

  The technology disclosed herein relates to a driver state detection device that detects an abnormal state of a driver.

  Conventionally, a technique for detecting biological information such as a driver's pulse and body temperature and estimating a driver's physical condition from the detected biological information is known (see Patent Document 1). In the technique described in Patent Literature 1, a sensor for detecting biological information is incorporated in an operation switch for operating an armrest portion of a vehicle seat or a device. This prevents the driver from feeling restrained when detecting biometric information.

JP 2009-247649 A

  However, in order to accurately detect the driver's biological information using the sensor, the sensor needs to be in close contact with the driver. For this reason, as long as a sensor for detecting biological information is used, it is inevitable to give the driver a sense of restraint. Therefore, it is desired to easily detect an abnormal state of the driver without using a sensor that detects biological information.

  The technology disclosed herein aims to easily detect an abnormal state of a driver without using a sensor that detects biological information.

  In order to solve the above-described problem, one aspect of the technology disclosed herein is an image capturing unit that is disposed in a vehicle interior and images a driver, and an image of the driver captured by the image capturing unit. A posture determining unit that determines a vertex angle that is an inclination angle with respect to a vertical direction of a straight line connecting the driver's waist and the top of the head; and a predetermined first threshold angle on the forward tilt side and a second threshold angle on the rear tilt side. When the storage unit to be stored and the vertex angle of the driver are outside the range from the first threshold angle on the forward tilt side to the second threshold angle on the rear tilt side, it is determined that the driver is in an abnormal state And a state determination unit.

  In this aspect, the posture determination unit determines a vertex angle that is an inclination angle with respect to the vertical direction of a straight line connecting the driver's waist and the crown from the driver's image captured by the imaging unit. When the determined vertex angle of the driver is outside the range from the first threshold angle on the forward tilt side to the second threshold angle on the rear tilt side, the state determination unit determines that the driver is in an abnormal state. . The fact that the driver's vertex angle is out of the range from the first threshold angle on the forward tilt side to the second threshold angle on the rear tilt side deviates from the normal driving posture, and it is considered that the driver is not in a normal state. Therefore, according to this aspect, it is possible to easily detect the abnormal state of the driver without using a sensor that detects biological information.

  In order to solve the above-described problem, another aspect of the technology disclosed herein includes an imaging unit that is disposed in a vehicle interior and images a driver, and an image of the driver that is captured by the imaging unit. A posture determination unit that determines a vertex angle that is an inclination angle with respect to a vertical direction of a straight line connecting the waist portion and the crown portion of the driver, and a torso angle that is an inclination angle with respect to the vertical direction of the driver's torso, When the storage unit stores the first threshold angle on the forward tilt side and the second threshold angle on the rear tilt side, and when the vertex angle of the driver is tilted forward from the first threshold angle on the forward tilt side, When it is determined that the driver is in an abnormal state and the top angle of the driver is tilted backward from the second threshold angle on the backward tilt side, the top angle of the driver and the driver's torso And the driver's vertex angle is the driver When inclined to the rear from the torso angle is provided with the, and the state determination unit determines that the driver is in an abnormal state.

  In this aspect, from the image of the driver imaged by the imaging unit, the vertex angle, which is the inclination angle with respect to the vertical direction of the straight line connecting the driver's waist and the crown portion, and the inclination angle with respect to the vertical direction of the driver's torso A certain torso angle is determined by the posture determination unit. When the driver's vertex angle is tilted forward from the first threshold angle on the forward tilt side, the driver has deviated from the normal driving posture and the driver is considered not to be in a normal state. If it is, it is determined by the state determination unit.

  When the top angle of the driver is tilted backward from the second threshold angle on the rearward tilt side, the top angle of the driver and the torso angle of the driver are compared. When the driver's vertex angle is tilted backwards from the driver's torso angle, the driver's neck is tilted behind the torso and deviates from the normal driving posture. Therefore, the state determination unit determines that the driver is in an abnormal state. Therefore, according to this aspect, it is possible to easily detect the abnormal state of the driver without using a sensor that detects biological information.

  In the above aspect, the vehicle speed sensor for detecting the speed of the vehicle, the vehicle speed detected by the vehicle speed sensor being equal to or lower than a predetermined speed, and the top threshold angle of the driver is the second threshold value on the backward tilt side And a time counting unit that counts the duration of the state in which the vertex angle of the driver is tilted backward from the second threshold angle on the backward tilt side when tilted backward from the angle. The state determination unit may determine that the driver is in an abnormal state when the duration time counted by the time measuring unit is equal to or longer than a predetermined time.

  In general, when the speed of the vehicle is a low speed equal to or lower than a predetermined speed, the driver may take a posture deviating from a normal driving posture such as bending a neck backward and leaning on a headrest. Therefore, in this aspect, when the vehicle speed detected by the vehicle speed sensor is equal to or lower than the predetermined speed and the driver's vertex angle is tilted backward from the second threshold angle on the backward tilt side, The time duration of the state in which the vertex angle is tilted backward from the second threshold angle on the backward tilt side is counted by the time measuring unit.

  And if the duration counted by the time measuring unit is equal to or longer than a predetermined time, it is considered that the state deviating from the normal driving posture is too long, so the state determining unit determines that the driver is in an abnormal state. . Therefore, according to this aspect, the abnormal state of the driver can be detected in consideration of the speed of the vehicle.

  According to this driver state detection device, when the driver's vertex angle is outside the range from the first threshold angle on the forward tilt side to the second threshold angle on the rear tilt side, it is determined that the driver is in an abnormal state. Therefore, it is possible to easily detect the abnormal state of the driver without using a sensor that detects biological information.

It is a block diagram which shows roughly the structure of the vehicle by which the driver state detection apparatus of this Embodiment is mounted. It is a figure explaining a vertex angle. It is a figure explaining a torso angle. It is a figure which shows an example of the measurement data of a vertex angle. It is a flowchart which shows an example of a driver state detection operation | movement. It is a flowchart which shows an example of a driver state detection operation | movement. It is a figure which shows roughly the driver | operator's driving posture immediately before the accident estimated from the example of autopsy.

(Focus point of one aspect according to the present disclosure)
First, an aspect of one aspect according to the present disclosure will be described. One of the causes of traffic accident deaths is a sudden change in the physical condition of the driver while driving. Factors that cause a sudden change in the physical condition of the driver include various diseases such as a cerebrovascular disease and a heart disease, and the state of the driver who cannot continue driving due to the sudden change in the physical condition is not constant.

  It is difficult to determine such poor physical condition of the driver from biological information such as a pulse or eye movement. In addition, as described above, it is desired to easily detect the state of the driver without using a sensor that detects biological information.

  FIG. 7 is a diagram schematically showing the driving posture of the driver immediately before the accident estimated from an autopsy example. As shown in FIG. 7, the driver 2 seated in the driver's seat 1 leans against the steering wheel 3 and has a forward leaning posture as compared with a normal driving posture. In many cases, the driver 2 whose physical condition has suddenly changed during driving cannot perform an action for avoiding an accident. Therefore, it is considered that the driver 2 has a reduced level of consciousness due to sudden changes in physical condition, and has lost consciousness in some cases. For this reason, as shown in FIG. 7, the driver 2 is considered to be in a forward leaning posture deviating from the normal driving posture. In view of the above considerations, one aspect of the present disclosure described below has been devised.

(Embodiment)
Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In each figure, the same numerals are given to the same element, and explanation is omitted suitably.

  FIG. 1 is a block diagram schematically showing the configuration of a vehicle on which the driver state detection device of the present embodiment is mounted. The vehicle 10 is a four-wheeled vehicle, for example. As shown in FIG. 1, the vehicle 10 includes an in-vehicle camera 101, a vehicle speed sensor 103, an operation switch 106, a brake pedal 107, a steering sensor 108, an alarm sound generator 201, a hazard flasher 202, a driving support device 203, and an electronic control unit. (ECU) 300 is provided.

  The in-vehicle camera 101 (an example of an imaging unit) is attached to, for example, a front pillar on the passenger seat side in the vehicle 10 so that the optical axis of the in-vehicle camera 101 faces the driver's seat of the vehicle 10. The in-vehicle camera 101 images the driver of the vehicle 10 from the lateral direction. The in-vehicle camera 101 outputs the captured image data to the ECU 300.

  Alternatively, the in-vehicle camera 101 may be attached to the lateral ceiling of the driver's seat in the vehicle 10 so that the optical axis of the in-vehicle camera 101 faces the driver's seat of the vehicle 10. Further alternatively, a plurality of cameras may be attached to the front pillar on the passenger seat side, the ceiling in the interior of the vehicle 10 or the like so that each optical axis faces the driver's seat of the vehicle 10.

  The vehicle speed sensor 103 (an example of an environment detection unit) detects the traveling speed of the vehicle 10. The vehicle speed sensor 103 outputs the detected traveling speed of the vehicle 10 to the ECU 300. The operation switch 106 is for stopping the operating alarm sound generator 201 and is operated by the driver. The brake pedal 107 is for operating a brake and is operated by a driver's foot. The steering sensor 108 is disposed on the steering wheel, and detects torque applied to the steering wheel by the driver.

  The alarm sound generator 201 includes, for example, a buzzer or a bell, and generates an alarm sound for the driver. The hazard flasher 202 blinks all the orange direction indicator lights (for example, four) simultaneously. The driving support device 203 supports driving of the vehicle 10 by the driver. The driving assistance device 203 may have a function of decelerating or stopping the vehicle 10 by automatically operating a brake. The driving assistance device 203 may have a function of causing the vehicle 10 to maintain a lane by controlling the steering wheel.

  ECU 300 controls the overall operation of vehicle 10. ECU 300 includes a central processing unit (CPU) 310, a memory 320, and other peripheral circuits. The memory 320 (an example of a storage unit) is configured by, for example, a semiconductor memory such as a flash memory, a hard disk, or another storage element. The memory 320 includes a memory that stores a program, a memory that temporarily stores data, and the like. The memory 320 stores a predetermined first threshold angle θt1 on the forward tilt side and a second threshold angle θt2 on the rear tilt side as a part of the program. The first threshold angle θt1 and the second threshold angle θt2 will be described in detail later. The memory 320 may be composed of a single memory having an area for storing a program and an area for temporarily storing data.

  The CPU 310 functions as an attitude determination unit 311, a state determination unit 312, a timer unit 314, and an operation control unit 315 by operating according to a program stored in the memory 320.

  The posture determination unit 311 extracts the driver from the image data captured by the in-vehicle camera 101 by, for example, template matching. The posture determination unit 311 determines the extracted vertex angle and torso angle of the driver.

  FIG. 2 is a diagram for explaining the vertex angle. FIG. 3 is a diagram illustrating the torso angle. FIGS. 2 and 3 show a state in which a driver 23 sitting on the driver's seat 21 and holding the steering wheel 22 and driving the vehicle is viewed from the side.

  The vertex angle θ1 is an inclination angle of a straight line 29 connecting the lower end 24 of the waist and the crown portion 28 with respect to the vertical line 27. The torso angle is an inclination angle with respect to the vertical direction of the trunk. Specifically, the torso angle θ2 is an inclination angle with respect to the vertical line 27 of the straight line 26 connecting the lower end 24 of the waist and the base 25 of the neck.

  The posture determination unit 311 detects the lower end 24 of the waist 23 and the top 28 of the driver 23 extracted by template matching or the like, and determines the top angle θ1. The posture determination unit 311 further detects the base 25 of the neck and determines the torso angle θ2.

  In this embodiment, as shown in FIG. 2 and FIG. 3, when the base 25 of the neck or the top of the head 28 is level with respect to the lower end 24 of the waist (−90 degrees), On the other hand, when the base 25 of the neck or the top 28 is horizontal rearward (+90 degrees). That is, in the present embodiment, when the driver 23 is in the forward leaning posture, the vertex angle θ1 and the torso angle θ2 are set to negative values, and when the driver 23 is in the backward leaning posture, the vertex angle θ1 and the torso angle θ2 are set to positive values. It is set. When the driver 23 is driving normally, the vertex angle θ1 and the torso angle θ2 are normally positive values as shown in FIGS.

  Returning to FIG. 1, the state determination unit 312 determines the driver's 23 vertex angle θ1 and torso angle θ2 determined by the posture determination unit 311, the first threshold angle θt1 on the forward tilt side stored in the memory 320, and the rear Whether or not the driver 23 is in an abnormal state is determined using the second threshold angle θt2 on the tilt side.

  FIG. 4 is a diagram illustrating an example of actually measured data of the vertex angle θ1. FIG. 4 shows the result of integrating the driver's parietal angle measured at regular intervals during driving. The horizontal axis in FIG. 4 represents the vertex angle θ1, and the vertical axis represents the measured frequency. The lower diagram of FIG. 4 is an enlarged view of the vertical axis of the upper diagram in order to clearly represent the frequency number of the low-frequency vertex angle θ1. As shown in the lower diagram of FIG. 4, the vertex angle θ1 is included in the range of θt1 ≦ θ1 ≦ θt2.

  Therefore, in the memory 320, θt1 is stored as a predetermined first threshold angle on the forward tilt side, and θt2 is stored as a second threshold angle on the rearward tilt side. As can be seen from FIG. 4, the first threshold angle θt1 on the forward tilt side is a negative value, and the second threshold angle θt2 on the rear tilt side is a positive value.

  Returning to FIG. 1, the state determination unit 312 determines whether or not the vertex angle θ1 of the driver 23 determined by the posture determination unit 311 is less than the first threshold angle θt1 on the forward tilt side stored in the memory 320. judge. The state determination unit 312 determines that the driver 23 is in an abnormal state if the vertex angle θ1 is less than the first threshold angle θt1.

  If the vertex angle θ1 is equal to or greater than the first threshold angle θt1, the state determination unit 312 determines whether the vertex angle θ1 exceeds the second threshold angle θt2 on the backward tilt side stored in the memory 320. If the vertex angle θ1 is equal to or smaller than the second threshold angle θt2, the state determination unit 312 determines that the driver 23 is not in an abnormal state.

  If the vertex angle θ1 exceeds the first threshold angle θt2, the state determination unit 312 determines whether the vertex angle θ1 is greater than the torso angle θ2. If the vertex angle θ1 is larger than the torso angle θ2, the state determination unit 312 determines that the speed of the vehicle 10 detected by the vehicle speed sensor 103 is equal to or less than a predetermined speed Vt (for example, Vt = 0 km / h in the present embodiment). It is determined whether or not the vehicle 10 is stopped).

  When the speed of the vehicle 10 is equal to or lower than the predetermined speed Vt, when the state in which the vertex angle θ1 is larger than the torso angle θ2 continues for a predetermined time Tt (for example, Tt = 30 seconds in this embodiment), the state determination unit 312 It is determined that the driver 23 is in an abnormal state. Therefore, the time measuring unit 314 counts the duration from the time when it is determined that the vertex angle θ1 is larger than the torso angle θ2.

  When the state determination unit 312 determines that the driver 23 is in an abnormal state, the driving control unit 315 activates the hazard flasher 202 and blinks all the direction indicators to call attention to other vehicles. . The driving control unit 315 supports the driving of the driver by controlling the driving support device 203. For example, the operation control unit 315 may decelerate or stop the vehicle 10 by operating a brake. The driving control unit 315 may maintain the lane in which the vehicle 10 is traveling by controlling the steering wheel 22.

  5 and 6 are flowcharts showing an example of the driver state detection operation. For example, when the engine of the vehicle 10 is started, the operations shown in FIGS. 5 and 6 are executed, for example, at regular time intervals.

  In step S <b> 501, the CPU 310 reads the detection value of the vehicle speed sensor 103 and stores it in the memory 320. In step S502, the posture determination unit 311 extracts the image of the driver 23 from the image data captured by the in-vehicle camera 101, for example, by template matching. The posture determination unit 311 determines the vertex angle θ1 of the driver 23 from the extracted image of the driver 23.

  In step S503, the state determination unit 312 determines whether the vertex angle θ1 determined by the posture determination unit 311 in step S502 is less than the first threshold angle θt1 on the forward tilt side. If the vertex angle θ1 is less than the first threshold angle θt1 on the forward tilt side (YES in step S503), the state determination unit 312 determines that the driver 23 is in an abnormal state, and the process proceeds to step S601 (FIG. Go to 6). On the other hand, if the vertex angle θ1 is equal to or greater than the first threshold angle θt1 on the forward tilt side (NO in step S503), the state determination unit 312 advances the process to step S504.

  In step S504, the state determination unit 312 determines whether or not the vertex angle θ1 exceeds the rearward second threshold angle θt2. If the vertex angle θ1 exceeds the rearward second threshold angle θt2 (YES in step S504), the state determination unit 312 advances the process to step S505. On the other hand, if the vertex angle θ1 is equal to or smaller than the second threshold angle θt2 on the backward tilt side (NO in step S504), the state determination unit 312 determines that the driver 23 is not in an abnormal state, and FIGS. End the indicated operation.

  In step S505, the posture determination unit 311 determines the torso angle θ2 of the driver 23 from the image of the driver 23 extracted in step S502. In step S506, the state determination unit 312 determines whether or not the vertex angle θ1 is greater than the torso angle θ2. If the vertex angle θ1 is larger than the torso angle θ2 (YES in step S506), the state determination unit 312 advances the process to step S507. On the other hand, if the vertex angle θ1 is equal to or smaller than the torso angle θ2 (NO in step S506), the state determination unit 312 determines that the driver 23 is not in an abnormal state, and ends the operations illustrated in FIGS. To do.

  In step S507, the state determination unit 312 determines whether or not the speed of the vehicle 10 detected by the vehicle speed sensor 103 is equal to or lower than a predetermined speed Vt. If the speed of vehicle 10 is equal to or lower than predetermined speed Vt (YES in step S507), state determination unit 312 advances the process to step S508. On the other hand, if the speed of vehicle 10 exceeds predetermined speed Vt (NO in step S507), state determination unit 312 determines that driver 23 is in an abnormal state, and the process proceeds to step S601 (FIG. 6). ).

  In step S508, the timer 314 counts the elapsed time. This elapsed time is the elapsed time from the time when it is determined that the speed of the vehicle 10 is equal to or lower than the predetermined speed Vt (YES in step S507). However, if the vertex angle θ1 is substantially larger than the torso angle θ2. It can be regarded as the elapsed time from the determined time (YES in step S506).

  In step S509, the time measuring unit 314 determines whether or not the elapsed time being counted has reached a predetermined time Tt. If the elapsed time has reached the predetermined time Tt (YES in step S509), the timer unit 314 advances the process to step S601 (FIG. 6). On the other hand, if the elapsed time has not reached the predetermined time Tt (NO in step S509), the time measuring unit 314 returns the process to step S506.

  In step S601 of FIG. 8, the state determination unit 312 determines that the driver is in an abnormal state, activates the alarm sound generator 201, and alerts the driver 23.

  In step S602, the state determination unit 312 determines whether or not there is a response from the driver 23 to the operation of the alarm sound generator 201 in step S601. For example, when the operation switch 106 is operated and the alarm sound generator 201 is turned off, the state determination unit 312 determines that there is a reaction from the driver 23. The state determination unit 312 may determine that there is a reaction from the driver 23 when the brake pedal 107 is operated. If the state determination unit 312 determines that the steering wheel 22 has been operated based on the detection value of the steering sensor 108, the state determination unit 312 may determine that there is a response from the driver 23.

  If it is determined that there is a reaction from the driver 23 (YES in step S602), the state determination unit 312 ends the operations illustrated in FIGS. On the other hand, if it is determined that there is no response from the driver 23 (NO in step S804), state determination unit 312 advances the process to step S603.

  In step S603, the operation control unit 315 activates the hazard flasher 202 to blink the hazard lamps (four orange direction indicators). In subsequent step S604, the driving control unit 315 operates the driving support device 203. Thereafter, the operations shown in FIGS. 5 and 6 are terminated.

  As described above, in the present embodiment, the vertex angle θ1 of the driver 23 is determined from the image of the driver 23 captured by the in-vehicle camera 101. If the determined vertex angle θ1 is less than the first threshold angle θt1 on the forward tilt side (YES in step S503), it is determined that the driver 23 is in an abnormal state, and the alarm sound generator 201 is activated. .

  In the present embodiment, if the determined vertex angle θ1 exceeds the second threshold angle θt2 on the backward tilt side (YES in step S504), the vertex angle θ1 and the torso angle θ2 are compared (step S506). If the vertex angle θ1 is equal to or smaller than the torso angle θ2 (NO in step S506), it is determined that the driver 23 is not in an abnormal state. On the other hand, if the vertex angle θ1 is larger than the torso angle θ2 (YES in step S506), it is determined whether or not the speed of the vehicle 10 is equal to or lower than a predetermined speed Vt (for example, Vt = 0 km / h) (step S507).

  In this case, since the vertex angle θ1 exceeds the second threshold angle θt2 on the backward tilt side, it is considered that the torso angle θ2 is also tilted backward. At this time, the torso angle θ2 tilting backward is regulated by the back surface portion of the driver's seat 21 (FIG. 2). Therefore, the fact that the vertex angle θ1 is larger than the torso angle θ2 indicates that the head of the driver 23 is tilted rearward from the back surface portion of the driver seat 21 (FIG. 2). In other words, it means that the driver 23 takes a posture deviating from the normal driving posture. However, when the vehicle 10 is stopped, the driver 23 may take such a posture for a break.

  Therefore, in this embodiment, if the speed of the vehicle 10 is equal to or lower than a predetermined speed Vt (in this embodiment, for example, Vt = 0 km / h) (YES in step S507), the elapsed time is counted. If the speed of the vehicle 10 exceeds the predetermined speed Vt during the elapsed time counting (NO in step S507), it is determined that the driver 23 is in an abnormal state, and the alarm sound generator 201 is activated.

  On the other hand, when a predetermined time Tt (in this embodiment, for example, Tt = 30 seconds) has elapsed (YES in step S509), it is determined that the driver 23 is in an abnormal state, and the alarm sound generator 201 is activated. The

  Therefore, according to this embodiment, it is possible to easily detect the abnormal state of the driver 23 without using a sensor that detects biological information.

(Modified embodiment)
(1) In FIGS. 5 and 6, if steps S505 to S509 are omitted and the vertex angle θ1 of the driver 23 exceeds the second threshold angle θt2 on the backward tilt side (YES in step S504), the process is performed in step S601. You may make it progress to. That is, if the vertex angle θ1 of the driver 23 is outside the range from the first threshold angle θt1 on the forward tilt side to the second threshold angle θt2 on the rear tilt side, the state determination unit 312 causes the driver 23 to be in an abnormal state. It may be determined that In this case, the posture determination unit 311 may not determine the torso angle θ2 of the driver 23. Also in this embodiment, the abnormal state of the driver 23 can be easily detected without using a sensor that detects biological information.

  (2) In FIGS. 5 and 6, steps S507 to S509 may be omitted, and if the vertex angle θ1 is larger than the torso angle θ2 (YES in step S506), the process may be advanced to step S601. Also in this embodiment, the driver 23 taking a posture deviating from the normal driving posture in which the head of the driver 23 is tilted rearward from the back surface portion of the driver seat 21 (FIG. 2) is in an abnormal state. It can be determined that

  (3) The posture determination unit 311 may store the determined vertex angle θ1 of the driver 23 in the memory 320. The state determination unit 312 may rewrite the first threshold angle θt1 on the forward tilt side to the lower limit value of the fluctuation range of the vertex angle θ1 accumulated in the memory 320. The state determination unit 312 may rewrite the rearward second threshold angle θt2 to the upper limit value of the fluctuation range of the vertex angle θ1 accumulated in the memory 320. Accordingly, the first threshold angle θt1 on the forward tilt side and the second threshold angle θt2 on the rear tilt side can be updated to values suitable for the driver 23 who uses the vehicle 10.

  (4) In the above embodiment, the predetermined speed Vt is set to Vt = 0 km / h, but is not limited thereto. For example, the predetermined speed Vt may be set to a low speed of 10 km / h or less.

101 In-Vehicle Camera 103 Vehicle Speed Sensor 311 Posture Determination Unit 312 State Determination Unit 314 Timekeeping Unit 320 Memory

Claims (3)

An imaging unit that is arranged in a vehicle interior and images a driver;
A posture determination unit that determines a vertex angle that is an inclination angle with respect to a vertical direction of a straight line connecting the waist and the top of the driver from the image of the driver imaged by the imaging unit;
A storage unit that stores a first threshold angle on a forward tilt side and a second threshold angle on a rear tilt side;
A state determination unit that determines that the driver is in an abnormal state when the vertex angle of the driver is outside a range from the first threshold angle on the forward tilt side to the second threshold angle on the rear tilt side;
A driver state detection device comprising: An imaging unit that is arranged in a vehicle interior and images a driver;
From the image of the driver imaged by the imaging unit, a vertex angle that is an inclination angle with respect to the vertical direction of a straight line connecting the waist portion and the crown portion of the driver, and an inclination angle with respect to the vertical direction of the driver's torso A posture determination unit for determining a certain torso angle;
A storage unit that stores a first threshold angle on a forward tilt side and a second threshold angle on a rear tilt side;
When the vertex angle of the driver is tilted forward from the first threshold angle on the forward tilt side, it is determined that the driver is in an abnormal state,
When the driver's vertex angle is tilted backward from the rearward second threshold angle, the driver's vertex angle and the driver's torso angle are compared,
A state determination unit that determines that the driver is in an abnormal state when the driver's vertex angle is tilted backward from the driver's torso angle;
A driver state detection device comprising: A vehicle speed sensor for detecting the speed of the vehicle;
When the vehicle speed detected by the vehicle speed sensor is equal to or lower than a predetermined speed and the driver's vertex angle is tilted rearward from the second threshold angle on the rearward tilt side, the driver's vertex A time counting unit for counting a duration of a state in which the angle is tilted backward from the second threshold angle on the backward tilt side;
Further comprising
The state determining unit determines that the driver is in an abnormal state when the duration counted by the time measuring unit is equal to or longer than a predetermined time.
The driver state detection device according to claim 1 or 2.

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