Inventive Non-contact Driver Drowsiness Detection System for Vital Signal Monitoring

This paper describes an in-vehicle non-intrusive biopotential measurement system for driver health monitoring and fatigue detection. Previous research has found that the physiological signals including eye features, Electrocardiography (ECG), and their secondary parameters such as HR and HRV are good indicators of health state as well as driver fatigue. A conventional bio-potential measurement system requires the electrodes to be in contact with human body. This not only interferes with the driver operation, but also is not feasible for long-term monitoring purpose. The driver assistance system in this paper can remotely detect the bio-potential signals with no physical contact with human skin. With delicate sensor and electronic design, ECG, and eye blinking can be measured. Experiments were conducted on a high fidelity driving simulator to validate the system performance. The system was found to be able to detect the ECG signals through cloth or hair with no contact with skin. Eye blinking activities can also be detected at a distance of 10 cm. Digital signal processing algorithms were developed to decimate the signal noise and extract the physiological features. The extracted features from the vital signals were further analyzed to assess the potential criterion for alertness and drowsiness determination.