US 12,136,279 B2
Drowsiness detection device
Kenichi Nagahashi, Susono (JP); and Jungang Guan, Susono (JP)
Assigned to YAZAKI CORPORATION, Tokyo (JP)
Filed by YAZAKI CORPORATION, Tokyo (JP)
Filed on Nov. 6, 2023, as Appl. No. 18/503,024.
Claims priority of application No. 2022-197907 (JP), filed on Dec. 12, 2022.
Prior Publication US 2024/0193967 A1, Jun. 13, 2024
Int. Cl. G06V 20/59 (2022.01); G06V 40/16 (2022.01); G06V 40/19 (2022.01)
CPC G06V 20/597 (2022.01) [G06V 40/166 (2022.01); G06V 40/19 (2022.01)] 5 Claims
OG exemplary drawing
 
1. A drowsiness detection device comprising:
an imaging unit configured to image a face of a detection target person;
a first calculation unit configured to calculate, based on an image imaged by the imaging unit, a drowsiness index value that is a time period during which the detection target person closes an eye within a first predetermined time period or a value according to the time period;
a drowsiness detection unit configured to detect drowsiness of the detection target person in a case that the drowsiness index value is equal to or larger than a threshold value;
a threshold value setting unit configured to set the threshold value based on an initial drowsiness index value calculated first after a predetermined trigger; and
a second calculation unit configured to calculate, based on an image imaged by the imaging unit, the number of times of blinking of the detection target person within a second predetermined time period, wherein
the threshold value setting unit is configured to set the threshold value based on the initial drowsiness index value and an initial number of times of blinking calculated first after the predetermined trigger.