1. A method for interpolating an intermediate polygon from two polygons P 1 and P 2 , the method comprising: defining a similarity measure based on a geometrical reference object, the geometrical reference object being associated with the two polygons; based on the similarity measure, determining an initial pair of corresponding points; iteratively generating from the initial pair of corresponding points a sequence of pairs of corresponding points, any pair of corresponding points being related to an immediate predecessor pair of corresponding points by way of the geometrical reference object; and interpolating the intermediate polygon either from the initial pair of corresponding points or from one pair of corresponding points from the generated sequence of pairs of corresponding points.