PERCLOS is an effective cue for driver fatigue detection.

PERCLOS是有效地检测驾驶员瞌睡的特征。

This method is the foundation method of obtaining Perclos, blinking frequency and yawning frequency.

该方法是获得眼睛闭合程度、眨眼频率、打哈欠频率的基础算法。

This paper selects a variety of visual features as the fatigue characteristics, including Perclos, blinking frequency, yawning frequency and nodding frequency.

本文选取了多种视觉特征作为疲劳估计特征，包括眼睛闭合程度、眨眼频率、打哈欠频率和点头频率。