资料来源 : Free On-Line Dictionary of Computing

convex hull
     
         For a {set} S in space, the smallest
        {convex set} containing S.  In the plane, the convex hull can
        be visualized as the shape assumed by a rubber band that has
        been stretched around the set S and released to conform as
        closely as possible to S.
     
        (1997-08-03)