Patent ID: 6985172
Filing Date: 2006-01-10
Classification: G06K,G06T,G08B

Abstract:
1. A method of using video images to monitor incidents in a region of interest, comprising the steps of: computing a reference image from a set of images by removing moving objects from the set of images; storing a motion model representing anticipated motion in the region of interest; acquiring a image to be analyzed; computing a temporal difference image by comparing the image to be analyzed with the reference image; repeating the step of computing a temporal difference image to obtain a set of temporal difference images; calculating, from the set of temporal difference images, at least one temporal difference statistic for each pixel; detecting motion in a temporal difference image by separating motion pixels from background in the temporal difference image, using the temporal difference statistic; grouping motion pixels into motion objects; extracting features from the objects; comparing the features of motion objects to the motion model; wherein the motion model classifies objects as anticipated or not anticipated; and wherein the motion model further classifies anticipated objects as being of interest or not of interest.