“…Specifically, eight graphs are added to the twelve defined in [1] to cover the set theoretic operators: sum, prod, diff, compl, xor (denoting union, intersection, relative difference, complement, and symmetric difference) and the discrete topological operators int D , cl D , ext D , and bndry D (denoting the discrete interior, closure, exterior, and boundary). The method is generic and does not favour any one particular image segmentation method over another, and all that is assumed is that pairs of regions can be represented as instances of binary relations.…”