Apparatus and method for automatically orienting a camera at a target

Abstract

Current indoor tracking methods are inadequate to accurately and reliably point a pointer or camera at an object or a person doing an activity. An apparatus and method are provided for cooperative tracking that is operable both indoors and outdoors. The system works using ranging technology without the need for placing radiation sources and/or sensors in set locations around the location where tracking takes place. The apparatus and method may be used for automatic filming, allowing free movement of both the subject of the filming and that of the camera with a compact design, and providing easy setup at any location.

What is claimed: 
     
         1 . A method of automatically tracking an object by a pointer, said method comprising the steps of
 associating a tag with the object and using the tag to periodically emit and to receive radio signals;   providing a positioner configured to turn the pointer;   providing an array of sensors structurally connected to the pointer and comprising at least three spatially separated sensors in a triangular arrangement;   detecting radio signals emitted by said tag with the array of sensors;   determining tag-to-sensor distances between the tag and each sensor;   calculating tag-to-sensor distance differences; and   turning the pointer in a direction determined based on the tag-to-sensor distance differences.