
{"publication_number": "US-5406501-A", "abstract": "a method and device for use in detecting moving targets in a scene represented by a sequence of mutually registered images r over time wherein differential images d are derived from succeeding images r , and spatially low pass filtered to obtain a sequence of filtered differential images f . for each pixel of a plurality of pixels and for each of a plurality of directions , a sum of intensities is formed from a number of successive frames of the sequence of filtered differential images f n - m at pixel locations located , as the image is further back in time , along the direction progressively outwards from the pixel . for each pixel of the plurality of pixels , an intensities is determined which represents for the maximum size among the sums among the plurality of directions , the intensity for each pixel collectively forming an image g n .", "application_number": "US-22644294-A", "description": "according to the invention , instead of an extraction of 2 images supplying a differential image , as is known from the prior art , a more complete extraction is proposed which involves at least 4 registered consecutive images of a sequence of registered images r , namely : from these registered images r , at least 3 consecutive differential images of a sequence of differential images d are produced in the manner indicated in the following table i : table i______________________________________r . sub . n r . sub . n + 1 r . sub . n + 2 r . sub . n + 3 