Optical Motion Detection Using Image Partitioning

摘要

An optical system for surveillance or intrusion detection, based upon image partitioning, is proposed. The scene of interest is imaged onto a checkerboard pattern of transmissive and reflective areas and the transmitted and reflected light components are measured by detectors. Changes in the scene disturb the light balance and can cause an alarm indica¬tion. Several system configurations are proposed. Measurements and computer simu¬lations are used to determine the operating characteristics of the several configurations. Depth of focus problems at the patterned reflector are the primary concern. Noise con¬siderations determine the theoretical limitation of system performance and are analyzed in some detail. Indications are that, under good scene radiance conditions, a change in the scene of approximately one part in 103 is detectable with a signal-to-noise ratio suf¬ficient for a false alarm rate of one every few months.