System and method for determining state of driver
First Claim
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1. A system for determining a state of a driver, the system comprising:
- a memory storing program instructions; and
a processor configured to execute the program instructions, the program instructions when executed configured to;
detect coordinates and a direction vector of a face at intervals of a sampling time from a face image of the driver,detect a valid behavior of a vehicle as an event, anddetermine an impaired state of the driver based on a reflex response time of the driver when the event is detected,wherein the program instructions when executed are further configured to;
differentiate direction vectors of the face detected in a first time interval before the event occurs,differentiate direction vectors of the face calculated in a second time interval after the event occurs,determine the impaired state of the driver based on a variance value of differential values of a direction vector in the second time interval and a variance value of differential values of a direction vector in the first time interval, anddetermine that the driver is in the impaired state when a sum of sampling times of differential values corresponding to a variance value which meets a threshold range of a reference variance value among variance values of the differential values of the direction vector in the second time interval is greater than a threshold value.
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Abstract
A system for determining a state of a driver includes a face tracking device configured to detect coordinates and a direction vector of a face at intervals of a sampling time from a face image of the driver, an event detecting device configured to detect valid behavior of a vehicle as an event, and a determination device configured to determine an impaired state of the driver based on a reflex response time of the driver when the event is detected by the event detecting device.
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Citations
13 Claims
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1. A system for determining a state of a driver, the system comprising:
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a memory storing program instructions; and a processor configured to execute the program instructions, the program instructions when executed configured to; detect coordinates and a direction vector of a face at intervals of a sampling time from a face image of the driver, detect a valid behavior of a vehicle as an event, and determine an impaired state of the driver based on a reflex response time of the driver when the event is detected, wherein the program instructions when executed are further configured to; differentiate direction vectors of the face detected in a first time interval before the event occurs, differentiate direction vectors of the face calculated in a second time interval after the event occurs, determine the impaired state of the driver based on a variance value of differential values of a direction vector in the second time interval and a variance value of differential values of a direction vector in the first time interval, and determine that the driver is in the impaired state when a sum of sampling times of differential values corresponding to a variance value which meets a threshold range of a reference variance value among variance values of the differential values of the direction vector in the second time interval is greater than a threshold value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for determining a state of a driver, the method comprising:
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detecting, by a face tracking device, coordinates and a direction vector of a face at intervals of a sampling time from a face image of the driver; detecting, by an event detecting device, a valid behavior of a vehicle as an event; and determining, by a determination device, an impaired state of the driver based on a reflex response time of the driver, when the event is detected, wherein the determining comprises; differentiating direction vectors of the face detected in a first time interval before the event occurs, differentiating direction vectors of the face calculated in a second time interval after the event occurs, setting a variance value of differential values of a direction vector in the first time interval to a reference variance value, sequentially calculating variance values of differential values of a direction vector in the second time interval; calculating a sum of sampling times of differential values corresponding to a variance value which meets a threshold range of the reference variance value among the calculated variance values, and determining that the driver is in the impaired state when the calculated sum of the sampling times is greater than a threshold value. - View Dependent Claims (10, 11, 12, 13)
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Specification