Perception-Free Calibration of Eye Opening and Closing Threshold for Driver Fatigue Monitoring

Analyzing the opening and closing states of eyes and mouths by detecting the driver’s face feature points is an effective method for judging driver fatigue. However, in practical engineering applications, with the expansion of user groups, the false identification problem caused by the differentiation of individual facial features of drivers is prominent, especially for people with small eyes. To solve this problem, this paper uses the Mediapipe Facemesh module to detect face feature points and designs a perception-free calibration method for setting personalized eye opening and closing threshold combined with head postures. Compared with the traditional method of setting a fixed threshold, the precision of eye state recognition is improved by 36.4%. Finally, the model deployment and post-processing compilation are completed on the Xavier vehicle chip, achieving a running speed of 34 frames per second at most, and the subjective evaluation experience of the fatigue monitoring system is significantly improved.