Non-contact measurement of electrophysiological signals is of great interest in healthcare settings, with the potential of reducing disposable costs, speeding up or simplifying measurement techniques. Monitoring long-term medical conditions within the home or observing pilots, drivers, soldiers, and others in safety critical situations is now possible without needing skin contact. Monitoring vehicle drivers for health and alertness by detecting heart rate and respiration, or determining car occupancy to adjust the ride, handling and air bag deployment with the varying size and location of occupants, is a vast potential market.