A NEW METHOD FOR EXTRACTING AND REPRESENTING OBJECT CONTOURS IN REAL IMAGES

This paper introduces a new operator for the calculation of the bright ness gradient (derived from the Compass gradient) and a new methodolog y based on a fuzzy algorithm for extraction of the contour points of o bjects in a real image. A bidimensional geometrical representation of the contours thus extracted is then given in the form of arcs and segm ents in order to exploit this simplified description as an index for a search in a database of 3-D primitives. The procedure described gives good results, even in the presence of juxtaposed surfaces of the same nature and color, or with contours which do not contrast very well.