Patent ID: 7522746
Filing Date: 2009-04-21
Classification: G06T

Abstract:
1. A motion-sensing device used to track motion of an object, comprising: a first optical correlator having a first imager, the first optical correlator providing a first feedback signal that indicates motion of the object exclusively in first and second directions based on detected movement of a first image of the object from a first location within the first imager to a second location within the first imager, the first and second directions being perpendicular to each other; a first motor system that can move the first imager; a second optical correlator having a second imager, the second optical correlator providing a second feedback signal that indicates motion of the object exclusively in a third direction based on detected movement of a second image of the object from a first location within the second imager to a second location within the second imager, the third direction being perpendicular to the first and second directions; a second motor system that can move the second imager; and a controller that receives the first feedback signal from the first optical correlator and uses the feedback signal to calculate motion of the object and to control the first motor system to move the first imager so that the image of the object is returned to the first location within the imager, wherein the controller receives the second feedback signal from the second optical correlator and uses the second feedback signal to calculate motion of the object in the third direction and to control the second motor system to move the second imager.