Method and device for detecting drowsiness and preventing a driver of a motor vehicle from falling asleep
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United States of America Patent
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Oct 16, 2001
Grant Date -
N/A
app pub date -
Jul 14, 2000
filing date -
Jan 15, 1998
priority date (Note) -
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Abstract
The invention relates to a method and device using an optoelectronic sensor in combination with an electronic unit arranged inside a motor vehicle. The sensor is adjusted in line with the head of the driver sitting in said motor vehicle at the same time as the inner rear-view mirror, which comprises a one-way mirror behind which the sensor is positioned. After detecting the presence of a driver seated in the motor vehicle they frame first the whole face and then the eyes of the driver in the video signal raser emitted by the sensor aided by the electronic unit and then determine the successive durations of blinking episodes, which are compared with a limit value situated between one duration typical of an awake person and another duration typical of a drowsy person. A signal (transmitted by an alram unit) suitable for waking the driver is triggered when the duration of blinking exeeds the limit.
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