Patent ID: 9286515
Filing Date: 2016-03-15
CPC Classification: A61B,B60K,G06K,G08B

Claim Text:
1. A doze detection method comprising: measuring an open eye time and a closed eye time of a human eye, the open eye time being a state in which the eye is open among states between an eye closure to an eye opening thereof, and the closed eye time being a state other than the state in which the eye is open; setting a first threshold time, the first threshold time being shorter than an average open eye time of a healthy adult in an alert state; setting a second threshold time, the second threshold time being longer than an average closed eye time of a healthy adult in an alert state; making a first doze state determination in which existence of a doze state is immediately determined when (i) the measured open eye time is determined to be equal to or shorter than the first threshold time and (ii) the measured closed eye time of a blink occurring immediately after the measured open eye time determined to be equal to or shorter than the first threshold time reaches the second threshold time or more; setting a third threshold time, the third threshold time being a closed eye time that is longer than the second threshold time; and making a second doze state determination to again determine the existence of the doze state when a closed eye time of a blink reaches the third threshold time or more, the blink occurring after an open eye time equal to or shorter than the first threshold time.