Detection of pan positions in video surveillance camera

摘要

A method for detecting a plurality of pan positions in a stepper motor driven panable video surveillance camera of the type having a home sensor and detector to detect a home pan position and setting a pan motor step count to a known value at the home position, comprising: placing a plurality of position sensors and a home sensor in a spaced relation on a slip ring assembly of the panable video surveillance camera; detecting each of said position sensors and said home sensor by a detector positioned in a preselected location during panning of the video surveillance camera, each of said position sensors and said home sensor having an associated desired pan motor step count when detected; resetting the pan motor step count to the desired motor step count at each of said position sensor locations and said home sensor location when detected, wherein during panning of the video surveillance camera where the camera is not panned through a full pan range of motion to detect the home sensor, at least one of said position sensors is detected and used to reset the pan motor step count to the desired pan motor step count.