Measuring pedestrian trajectories using a pyroelectric differential infrared detector

Abstract

Low-cost, low-resolution infrared detectors have been used for measuring the trajectories of pedestrians. The detectors have been designed for counting the number of pedestrians crossing a line. The use of these detectors has been extended to provide complete trajectories across measurement areas approximately 3 Metres Square. This provides an effective way of rapidly measuring large numbers of pedestrian movements. Current work involves extending the effective area by combining trajectories from multiple detectors. Matching across detectors has been made difficult by the presence of edge effects. Progress is being made on the algorithms needed to track across fields of view.