Drowsy driver detection system
First Claim
1. A method of detecting impairment of a driver of a vehicle, comprising:
- sensing, using a sensor, a position of the driver'"'"'s head at a plurality of time points;
determining, using a microprocessor, changes in the position of the driver'"'"'s head between the plurality of time points;
evaluating, using a microprocessor, whether the changes in the position of the driver'"'"'s head between the plurality of time points exhibit at least one of a periodic and a quasi-periodic pattern, wherein the step of evaluating comprises performing an autocorrelation function on the changes in the position of the driver'"'"'s head between the plurality of time points, normalizing the results of the autocorrelation function, and performing peak detection on the normalized results to identify a center peak having a center peak amplitude and at least one off-center peak having an off-center peak amplitude;
determining whether the driver is impaired when the at least one off-center peak amplitude is greater than a percentage of the center peak amplitude; and
if the driver is impaired, alerting the driver using an alarm.
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Accused Products
Abstract
A method of detecting impairment of a driver of a vehicle. The method includes sensing, using a sensor, a position of the driver'"'"'s head at a plurality of time points; determining, using a microprocessor, changes in the position of the driver'"'"'s head between the plurality of time points; evaluating, using a microprocessor, whether the changes in the position of the driver'"'"'s head between the plurality of time points exhibit at least one of a periodic and a quasi-periodic pattern; determining whether the driver is impaired based on the pattern of the changes in the position of the driver'"'"'s head; and if the driver is impaired, alerting the driver using an alarm.
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Citations
14 Claims
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1. A method of detecting impairment of a driver of a vehicle, comprising:
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sensing, using a sensor, a position of the driver'"'"'s head at a plurality of time points; determining, using a microprocessor, changes in the position of the driver'"'"'s head between the plurality of time points; evaluating, using a microprocessor, whether the changes in the position of the driver'"'"'s head between the plurality of time points exhibit at least one of a periodic and a quasi-periodic pattern, wherein the step of evaluating comprises performing an autocorrelation function on the changes in the position of the driver'"'"'s head between the plurality of time points, normalizing the results of the autocorrelation function, and performing peak detection on the normalized results to identify a center peak having a center peak amplitude and at least one off-center peak having an off-center peak amplitude; determining whether the driver is impaired when the at least one off-center peak amplitude is greater than a percentage of the center peak amplitude; and if the driver is impaired, alerting the driver using an alarm. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system for detecting impairment of a driver of a vehicle, comprising:
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a sensor for sensing a position of the driver'"'"'s head at a plurality of time points, an alarm for alerting the driver; and a microprocessor, wherein the microprocessor is configured to determine changes in the position of the driver'"'"'s head between the plurality of time points; evaluate whether the changes in the position of the driver'"'"'s head between the plurality of time points exhibit at least one of a periodic and a quasi-periodic pattern, wherein, in order to evaluate, the microprocessor is further configured to perform an autocorrelation function on the changes in the position of the driver'"'"'s head between the plurality of time points, normalize the results of the autocorrelation function, and perform peak detection on the normalized results to identify a center peak having a center peak amplitude and at least one off-center peak having an off-center peak amplitude; determine whether the driver is impaired when the at least one off-center peak amplitude is greater than a percentage of the center peak amplitude; and if the driver is impaired, alert the driver using the alarm. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification