1. A method for classifying a selected feature in an original image, comprising: a) detecting at least one edge of said selected feature to make an initial determination of at least one portion of a boundary of said selected feature; b) providing a deformable contour in relation to said selected feature, the deformable contour being different from the detected at least one edge; c) overlapping the detected at least one edge with the deformable contour by deforming the deformable contour in relation to the detected at least one edge, to obtain a deformed contour approximating the boundary of said selected feature; d) determining a quality of matching in relation to a degree of overlap, resulting from step c), between the deformed deformable contour and the detected at least one edge; and e) classifying said selected feature into at least one category based on the quality of matching determined in step d).