ALEXANDRIA, Va., Dec. 16 -- United States Patent no. 12,496,005, issued on Dec. 16, was assigned to YAZAKI Corp. (Tokyo).
"Drowsiness detection device" was invented by Kenichi Nagahashi (Susono, Japan) and Jungang Guan (Susono, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A drowsiness detection device includes a PERCLOS calculation unit, a drowsiness detection unit, and a threshold value setting unit. The PERCLOS calculation unit calculates, based on an image imaged by a camera, a PERCLOS that is a ratio of a time period during which a driver closes an eye within a certain time period. The drowsiness detection unit detects drowsiness of the driver when the PERCLOS is equal to or larger than a thresho...