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Visibility methods are often based on the existence of large convex occluders. We present an algorithm that for a given simple non-convex polygon P finds an approximate inner-cover by large convex polygons. The algorithm is based on an initial partitioning of P into a set C of disjoint convex polygons which are an exact tessellation of P. The algorithm then… (More)
A rare case of ultrasonic visualization of multiple pleural masses in non-Hodgkin's lymphoma is presented. We believe this to be the first case of its kind in the literature.