MOTION INTERPRETATION BY ANALYZING DIFFERENCE IMAGES

We are concerned with extracting motion information from difference im ages. A difference image, formed by comparing gray-levels of two conti guous frames, contains moving areas. These moving areas are due to eit her COVering or UNCOVering a background by a moving object. We first d escribe how to label a moving area either COV or UNCOV. Especially, it will show how to subdivide a moving area formed by multiple moving ob jects, into COVs and UNCOVs of each object. We next extract motion cha racteristics of each COV and UNCOV region by examining distributions o f intensities and topological structures. Experimental results show th at the suggested method is very robust and accurate for natural as wel l as lab-generated images.