US Patent No: 5,786,765
Number of patents in Portfolio can not be more than 2000
Apparatus for estimating the drowsiness level of a vehicle driver
Stats
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Jul 28, 1998
Issued date -
Apr 11, 1997
filing date -
08/840,132
serial no -
Expired
status
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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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First Claim
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International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
|---|---|---|---|
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| 4,725,824 Doze prevention system | 43 | 1986 | |
| 5,573,006 Bodily state detection apparatus | 19 | 1994 | |
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| 4,397,531 Eye closure discrimination system | 17 | 1981 | |
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| 5,311,877 Waking degree maintaining apparatus | 24 | 1992 | |
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| 4,953,111 Doze detector | 32 | 1988 | |
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| 5,570,698 System for monitoring eyes for detecting sleep behavior | 44 | 1995 | |
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| 5,689,241 Sleep detection and driver alert apparatus | 119 | 1996 | |