Title:
DRIVER'S DROWSINESS ESTIMATION METHOD
Document Type and Number:
Japanese Patent JP2022182563
Kind Code:
A
Abstract:
To provide a driver's drowsiness estimation method which can accurately detect a sleepy or shallow sleepy state before a driver realizes.SOLUTION: A driver's drowsiness estimation method for estimating drowsiness of a driver of a vehicle comprises: a preparation step (S1) of preparing an in-vehicle camera 2 which detects a head behavior of the driver and a steering angle sensor 3 which detects a steering angle by a steering operation of the driver; a head roll angle calculation step (S3) of calculating a head roll angle based on the head behavior detected by the in-vehicle camera 2; a coherence calculation step (S4) of calculating a coherence value of the steering angle and the head roll angle detected by the steering angle sensor 3; and a drowsiness level determination step (S5, S6, S8, S9) of determining a preset drowsiness level 2 when the coherence value is 0.7 or more and less than 0.9 and determining the drowsiness level 3 at which the drowsiness is stronger than the drowsiness level 2 when the coherence value is less than 0.7.SELECTED DRAWING: Figure 7
Inventors:
YOSHIDA MAKOTO
IKUHISA KEN
IKUHISA KEN
Application Number:
JP2021090180A
Publication Date:
December 08, 2022
Filing Date:
May 28, 2021
Export Citation:
Assignee:
MAZDA MOTOR
International Classes:
A61B5/16; A61B5/18
Attorney, Agent or Firm:
Toshio Okamura
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