Abstract: A drowsiness detection device includes, an imaging unit, 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 time period ratio during which a driver closes the 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 threshold value. When an initial PERCLOS first calculated from a start of driving is less than a %, the threshold value setting unit sets the threshold value to be smaller than in a case that the initial PERCLOS is equal to or larger than a %.

Abstract: A drowsiness detection device includes, an imaging unit, 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 time period ratio during which a driver closes the 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 threshold value. When an initial PERCLOS first calculated from a start of driving is less than a %, the threshold value setting unit sets the threshold value to be smaller than in a case that the initial PERCLOS is equal to or larger than a %.

Abstract: 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 threshold value. The threshold value setting unit sets the threshold value to be smaller than in a case that an initial ratio of deep blinking is equal to or larger than a % when an initial ratio of deep blinking first calculated from a start of driving is less than a %.