Abstract
An 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 mimic 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 animation, it is shown that the large or the faster objects can be detected at a higher probability than smaller or slower ones.Tracking a moving object is demonstrated with a 2×2 photo-transistor array and a selective circuit including an exclusive gate circuit.
