DISTINGUISHING A MOVING OBJECT FROM A NOISY BACKGROUND

摘要

Three image frames containing the object of interest and background clutter are taken at successive time intervals and stored in memory. The background of images A, B and C are registered preferably using an area correlator (12). A median filter (16) is used to select a median value from the registered image frames. Then, subtractor (18) serves to subtract the median pixel values from one of the image frames. This difference output is then thresholded to provide a binary signal whose pixel values exceeding the threshold levels are generally associated with the position of the moving object.