Motion Detection with an Optical Novelty Filter

Abstract

Optical novelty filter based on the two-wave mixing in a photorefractive BaTiO3 crystal is applied to motion detection for the purpose of its application to the robot vision. A simple method is proposed to realize the reflex vision system that a human being possesses. Our method uses a photo-detector array to detect the output from the optical novelty filter and the detector element that obtains the highest signal is selected. By simulations using a simple animations, it is showed that the larger or the faster object can be detected in higher probability. Tracking a moving object is demonstrated with a 2 X 2 photo-transistor array and the selective circuit including the exclusive gate circuit. © 1998, The Japan Society of Mechanical Engineers. All rights reserved.