Apparatus for estimating the drowsiness level of a vehicle drive

Details Apparatus for estimating the drowsiness level of a vehicle drive Apparatus for estimating the drowsiness level of a vehicle drive

1997-04-11

1998-07-28

Hofsass, Jeffery A.

Communications: electrical

Condition responsive indicating system

Specific condition

340575, 600558, 351211, G08B 2300

Patent

active

057867658

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.

REFERENCES:
patent: 4397531 (1983-08-01), Lees
patent: 4725824 (1988-02-01), Yoshioka
patent: 4953111 (1990-08-01), Yamamoto et al.
patent: 5311877 (1994-05-01), Kishi
patent: 5570698 (1996-11-01), Liang et al.
patent: 5573006 (1996-11-01), Shimotani et al.
patent: 5689241 (1997-11-01), Clarke, Sr. et al.

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