Apparatus for estimating the drowsiness level of a vehicle driver
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United States of America Patent
Stats
-
Jul 28, 1998
Grant Date -
N/A
app pub date -
Apr 11, 1997
filing date -
Apr 12, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An apparatus for estimating a drowsiness level of a vehicle driver first prepares a frequency distribution of blink durations of the driver for a first predetermined period after the start of a driving operation, and sets a threshold value for a discrimination of slow blinks by the frequency distribution. Thereafter, the apparatus calculates, every second predetermined period, a ratio of the number of slow blinks to the total number of blinks of the driver's eyes during the second period, and discriminates a rise in the drowsiness level of the driver in accordance with the calculated ratio.
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