WO2007111223A1 - 運転者の精神状態検出装置および精神状態検出方法 - Google Patents
運転者の精神状態検出装置および精神状態検出方法 Download PDFInfo
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- WO2007111223A1 WO2007111223A1 PCT/JP2007/055908 JP2007055908W WO2007111223A1 WO 2007111223 A1 WO2007111223 A1 WO 2007111223A1 JP 2007055908 W JP2007055908 W JP 2007055908W WO 2007111223 A1 WO2007111223 A1 WO 2007111223A1
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- driver
- mental state
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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
- A61B5/16—Devices for psychotechnics; Testing reaction times ; Devices for evaluating the psychological state
- A61B5/18—Devices for psychotechnics; Testing reaction times ; Devices for evaluating the psychological state for vehicle drivers or machine operators
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/16—Devices for psychotechnics; Testing reaction times ; Devices for evaluating the psychological state
- A61B5/165—Evaluating the state of mind, e.g. depression, anxiety
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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
- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
- A61B5/0205—Simultaneously evaluating both cardiovascular conditions and different types of body conditions, e.g. heart and respiratory condition
Definitions
- the present invention relates to a driver's mental state detection device and a mental state detection method for detecting a mental state of a driver who operates a steering wheel of a vehicle or a ship.
- the driver's mental state is determined based on the driver's heartbeat information while the vehicle is running, and for example, when the user is in a drowsiness state, a message that prompts the user to wake up is displayed in an image or voice.
- Patent Document 2 For example, see Patent Document 2.
- the potential difference electrocardiogram between the driver's hands is measured, and the heart rate is measured from this waveform. Then, it can be determined from the measurement data whether the mental state is drowsiness or tension, and the determination result can be messaged with an image or a voice through a display or a speaker to prompt the appropriate countermeasure.
- the driver's distraction state (hazy state) is determined from the If the information is generated, it will be a mistake.
- Patent Document 1 Japanese Patent No. 3727803
- Patent Document 2 Japanese Patent Laid-Open No. 2004-344269
- Patent Document 3 Japanese Patent No. 3027786
- Patent Document 1 when one feels drowsy or in a nervous state, it is difficult to think about the situation of one-handed driving as viewed from the driving behavior of a normal driver. Such drowsiness and tension occur. On the other hand, the situation where one-handed driving is continuously performed occurs when the driver is relaxed or distracted.
- the driver's gaze movement force attention distraction can be detected, but if the gaze is not powered, it can also occur during highway or tunnel travel, and as a method of detecting distraction, It ’s hard to say that it ’s optimal.
- a problem to be solved by the present invention is to improve the reliability of detecting the mental state of the driver in a traveling vehicle.
- the mental state detection device includes a plurality of detection means for detecting the state of the driver, and a state determination unit that determines the state of the driver based on the detection result from the detection unit.
- a mental state determination unit that determines a driver's mental state based on the detection result of the detection unit force, and an output from the detection unit to the mental state determination unit based on the determination result of the state determination unit.
- switching means for switching.
- the mental state detection method includes a detection step of detecting the state of the driver by a plurality of detection means, and a driver based on a detection result from the detection means.
- a state determination step for determining the state of the vehicle a mental state determination step for determining the mental state of the driver by the mental state determination unit based on the detection result from the detection unit, and a determination result of the state determination step.
- FIG. 1 is a block diagram showing a driver's mental state detection device according to an embodiment of the present invention.
- FIG. 2 is a flowchart showing a basic mental state detection method according to an embodiment of the present invention.
- FIG. 3 is a flowchart showing a specific mental state detection method according to an embodiment of the present invention.
- FIG. 4 is a flowchart showing another mental state detection method according to an embodiment of the present invention.
- FIG. 5 is a diagram for explaining the configuration of a mental state detection device for detecting a large number (N) of mental states.
- FIG. 6 is an explanatory diagram showing a relationship between a driver's state and a driver's mental state and a sensor for detecting these states and states.
- Appearance discrimination unit (appearance discrimination means)
- the embodiment of the present invention includes a plurality of detection means for detecting the state of the driver, a state determination means for determining the state of the driver based on the detection result from the detection means, and a detection means. Based on the detection result! / And mental state determination means for determining the mental state of the driver. Based on the determination result of the state determination means, output from the detection means to the mental state determination means And a switching means for switching between the driver's mental state detecting device.
- the detection results of the plurality of detection means are switched according to the state of the driver, and the reliability of the mental state detection can be improved as compared with the case where the mental state is detected individually. it can.
- the driver's mental state is a state of tension, drowsiness, agitation, fatigue, blurring (distraction), etc., and also has a state power that requires special attention when driving a vehicle or the like.
- an electrode for detecting a heartbeat provided on a handle operated by a driver is used as the mental state detection means.
- the driver's heart rate is measured by touching this electrode. If a normal heart rate cannot be obtained for a certain period of time, it can be determined that the handle is one-handed.
- the state of the driver changes depending on the mental state of the driver, and includes “relaxed driving posture”, “tired driving posture”, “other driving postures” and the like.
- “Relaxed driving posture” refers to a posture in which the driver puts his elbow on the window frame and operates the handle with one hand. These are the posture of the person and the warping posture.
- the switching unit switches the output from the detection unit to the mental state determination unit and switches the mental state determination process executed by the mental state determination unit. Therefore, the determination process of the driver's mental state can be performed separately by switching the mental state determination algorithm.
- the mental state determination means includes a first determination process for determining the driver's tension or drowsiness state, and a second determination process for determining the driver's distraction state. It is said. As a result, the determination of tension or drowsiness and the determination of distracted state can be performed separately by the first determination process and the second determination process switched by the switching means.
- the detection means includes heart rate measurement means for measuring the driver's heart rate with an electrode provided on a handle portion of a vehicle, and imaging means for imaging the driver. With this configuration, the driver's mental condition that matches both the driver's current heart rate and dynamics can be determined.
- the first determination process determines the driver's tension or drowsiness based on heartbeat information from the heartbeat measuring means, and the second determination process is performed in the passenger compartment.
- the configuration is such that the driver's gaze direction distribution is examined from the driver's imaging information provided by the imaging means, and the driver's distraction state is determined based on the distribution information.
- the driver's tension or drowsiness can be determined from the heartbeat information, and the driver's distraction can be accurately determined from the imaging information.
- the state determination unit when the state determination unit has input normal heartbeat information longer than a predetermined time from the heartbeat measurement unit, the driver holds the handle portion with both hands.
- the normal heart rate information is not input for longer than a predetermined time, it is determined that the driver holds the handle portion with one hand. This makes it possible to estimate the driver's tension or drowsiness while holding both hands on the steering wheel, and to estimate the driver's distraction state while holding the one hand on the steering wheel. Become.
- the switching means switches to output heart rate information from the heart rate measuring means to the mental state determining means when it is determined that the state determining means holds both hands, and the state determining means is When it is determined that the hand is held by one hand, the image pickup information from the image pickup unit is switched to be output to the mental state determination unit.
- the mental state determination means includes a third determination process in which the driver determines a stoop or warping posture. With this configuration, it is possible to analyze the mental state such as fatigue or frustration of the driver by the third discrimination process from the pressure distribution on the back and bottom of the driver's seat.
- the third determination process examines the driver's body pressure distribution based on the output of the pressure sensor provided in the driver's seat, and determines the driver's fatigue or irritation based on this distribution information. It is the structure which discriminate
- the mental state determination means includes a fourth determination process for determining the frequency of deep breathing performed by the driver.
- the fourth discrimination process can analyze the mental state of driver's agitation, fatigue, or tension.
- the frequency of occurrence of deep breathing is examined from the imaging information of the driver by the imaging means provided in the passenger compartment, and the driver's fatigue or agitation based on the occurrence frequency, Or the state of tension is discriminated. Accordingly, by processing the imaging information, it is possible to accurately determine the driver's fatigue, frustration, or tension state.
- the mental state determination means includes a fifth determination process for determining a head vibration of the driver. Therefore, the driver's sleepiness and distraction can be estimated from the arousal level obtained by the fifth discrimination process.
- the vibration state of the driver's head is examined from the image information of the driver by the imaging means provided in the passenger compartment, and the driving is performed based on the number or level of the vibrations. The degree of awakening is determined. Based on this, based on the determined arousal level, The driver's sleepiness and distraction can be estimated.
- a detection step of detecting the state of the driver by a plurality of detection means, and a state determination step of determining the state of the driver based on the detection result of the detection means force A mental state determination step for determining a mental state of the driver by the mental state determination unit based on a detection result from the detection unit; and a mental state determination from the detection unit based on the determination result of the state determination step.
- the imaging unit 11 captures the driver's face and line of sight with a camera or the like installed in the passenger compartment.
- the heart rate sensor 12 is provided on a handle that is held and operated by the driver, and measures the heart rate of the driver when the driver touches the handle with both hands.
- the state determination unit (state determination unit) 13 determines the state of the driver according to the heart rate information from the heart rate sensor 12.
- the switching unit (switching means) 14 captures images according to the state of the driver determined by the state determination unit 13. The function of switching the output from the unit 11 or the heart rate sensor 12 to the mental state determination unit 15 and switching the mental state determination process executed by the spirit state determination unit 15.
- This mental state discriminating unit (mental state discriminating means) 15 functions to execute a mental state discriminating process corresponding to the information switched by the switching unit 14.
- the state of the driver is detected by a plurality of detection means (in this case, the imaging unit 11 and the heart rate sensor 12) (step S1), and on the other hand, based on the detection result from the detection means (heart rate sensor 12)! / Then, it is determined whether or not the driver is holding the steering wheel as a state of the driver to determine whether or not the force is strong (step S2). According to this state discrimination result, the output from the detection means (imaging unit 11, heart rate sensor 12) to the mental state discrimination unit 15 is switched (step S3), and the detection result from the detection unit (imaging unit 11, heart rate sensor 12) Based on the above, the mental state of the driver is discriminated by the mental state discriminating unit 15 (step S4).
- the detection means in this case, the imaging unit 11 and the heart rate sensor 12
- step S11 it starts detecting the driver's mental state. Until this mental state detection is completed (step S11), it is determined as a driver's state whether or not the steering wheel is held by both hands (step S12). This determination is based on the heart rate data from the heart rate sensor 12.
- the state determination unit 13 determines that the one-hand holding is performed, and the imaging unit 11
- the mental state determination unit 15 determines that the driver's mental state is a distracted state (step S14).
- the mental state is switched according to the output of the state determination unit 13, that is, the heart rate change information is switched. It is determined (estimated) that the person's mental state is tension or sleepiness (step S13). In this way, by switching and detecting the mental state according to the driver's state by the switching unit 14, it is possible to improve the reliability of the mental state detection as compared with the case where the mental state is detected alone. It is done.
- the steering wheel holding condition when the driver is in a distracted state is learned so that the handle holding condition when detecting the distracted state is variable for each individual. Can do. In this case, as shown in FIG. 4, a distraction state may be detected while holding both hands. In addition, the time may be limited except for the time when sleepiness or tension is detected.
- step S12 when it is determined that both hands are held based on the output information of the heart rate sensor 12 (step S12), a heart rate measurement is performed by the heart rate sensor 12 (step S15), and the heart rate power is also as described above. Detects excessive tension or drowsiness (step S13). Therefore, it is checked whether the tension or drowsiness is detected (step S16). If tension or drowsiness is still not detected, switch to imaging by the imaging unit 11 (step S17). A diffuse state is detected (step S18).
- step S12 determines whether the handle is held by one hand.
- switching to imaging by the imaging unit 11 is performed to detect the driver's distraction state (step S17).
- step S18 it is determined whether the captured image force is also a distracted state force (step S18).
- FIG. 5 is a diagram for explaining a configuration of a mental state detection device for detecting a large number (N) of mental states.
- each mental state of driver D state 1 to state N
- each mental state such as drowsiness, tension, distraction, agitation and fatigue is detected by each sensor S1 to SN. is doing.
- the state of the driver D driving posture, etc.
- the sensor Sd for discriminating the state
- the mental state obtained from the deviation of the sensors S1 to SN switched by the switch means SW according to the discrimination result is shown. analyse.
- FIG. 6 is an explanatory diagram showing the relationship between the driver's state and the driver's mental state and sensors for detecting these states and states.
- the driver's determination of holding both hands is detected by the heart rate sensor 12 provided on the steering wheel, and the fatigued driving posture is determined by the pressure provided on the seat. Detect by sensor.
- the agitation can be estimated not only by heart rate information from the heart rate sensor 12, but also by changes in vehicle speed, vehicle speed, traffic congestion information, and the like.
- the above tension or drowsiness is the gaze distribution information obtained from the heart rate sensor 12 and the imaging unit 11.
- the distraction state can also be estimated from the gaze distribution information obtained from the imaging unit 11.
- Fatigue can be estimated from the pressure information obtained from the heart rate sensor 12 and the pressure sensor force of the seat.
- the mental state detection means provided in the seat portion uses a thin sheet-like pressure sensor (body pressure distribution sensor) installed on the seat.
- This pressure sensor is used to determine the fatigue posture by examining the pressure distribution in the driver's back and bottom area, or by determining whether the driver is in a stooped or curled posture.
- analysis is performed on mental states such as fatigue and frustration.
- a method of observing the temporal change in the load center position with changes in posture is used.
- the driver has body movement.
- This body movement is accompanied by, for example, deep breathing and head movement while driving.
- the frequency of these body movements is more than a certain level, agitation, fatigue, and tension can be estimated.
- Body movement caused by breathing with a large amplitude such as deep breathing or sighing is a force that is considered to be caused by the mental state such as agitation, fatigue, or tension.
- the vehicle speed and the vehicle speed change are estimated in association with the heart rate change.
- the situation of intermittent driving at low speed is regarded as a traffic jam situation, and if the heart rate increases at this time, it is assumed that the traffic jam is frustrating.
- traffic information that provides car navigation capabilities.
- head vibration synchronized with vehicle vibration may be examined.
- Figure 7 shows the flow for estimating fatigue, agitation, tension and sleepiness, and distraction. It is.
- step S20 first, until the mental state detection is completed (step S20), based on the pressure data distribution obtained from the pressure sensor car installed in the seat (driver's seat), the driver's posture It is checked whether or not the dog is stooped or warped, that is, whether the posture is fatigued (step S21). If the driver's driving posture is stooped or warped (YES), the driver's fatigue state is detected (step S22).
- Step S23 If the frequency of deep breathing is greater than or equal to a certain number of times (YES), this is detected as a frustrated state or a tension state (Step S24).
- step S25 it is checked whether the vibration of the driver's head is more than a certain amount.
- step S25 If the result of step S25 is that the head vibration is greater than or equal to a certain amount (YES), the same procedure as in the flow (steps S12 to S18) shown in FIG. 4 is executed.
- step S2 6 when it is determined that both hands are held based on the output information of the heart rate sensor 12 (step S2 6), the heart rate measurement is further performed by the heart rate sensor 12 (step S27), and this heart rate force also detects drowsiness as described above. (Step S28). Therefore, it is checked whether or not this drowsiness is detected (step S29) . If drowsiness is still not detected, switch to imaging by the imaging unit 11 (step S30) and detect a distracted state (step S31). .
- step S25 If the head vibration is less than a certain amount in step S25 (NO), a normal mental state is assumed. In this way, the detection target of the driver's mental state is changed according to the body movement that is the state of the driver.
- a warning sound is generated to promote arousal, comfortable music is played, or the vehicle speed is changed, thereby improving the operational stability of the vehicle. Can be secured.
- the driver's mental state detection device 10 includes the imaging unit 11, the heart rate sensor 12, and the heart rate sensor, which are a plurality of detection means for detecting the state of the driver.
- a state discriminating unit 13 for discriminating the state of the driver based on the detection result from the sensor 12, and the detection hand
- a mental state determination unit 15 for determining the driver's mental state based on the detection result from the stage, and based on the determination result of the state determination unit 13, the switching unit 14 is connected to the imaging unit 11 and the heart rate sensor 12 Switches the output to the mental state determination unit 15.
- the detection results from multiple detection means can be switched and output according to the driver's condition, so that the mental state and the driver's condition can be detected independently.
- the reliability of mental state detection can be improved. Therefore, it is possible to increase the reliability of detection of the mental state of the driver in the traveling vehicle without impairing the operability of driving the vehicle.
- the driver's mental state detection method includes a detection step of detecting a driver's state by a plurality of detection means (imaging unit 11, heart rate sensor 12), and detection means (imaging unit 11).
- the state discrimination step for discriminating the state of the driver by the state discrimination unit 13 and driving based on the detection result from the detection means (imaging unit 11, heart rate sensor 12)
- a switching step for switching for switching.
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JP2008507458A JP4739407B2 (ja) | 2006-03-24 | 2007-03-22 | 運転者の精神状態検出装置 |
US12/294,194 US20090209829A1 (en) | 2006-03-24 | 2007-03-22 | Apparatus for detecting driver's mental state and method for detecting mental state |
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JP2006-083161 | 2006-03-24 | ||
JP2006083161 | 2006-03-24 |
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US20090209829A1 (en) | 2009-08-20 |
JPWO2007111223A1 (ja) | 2009-08-13 |
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