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In the computer aided design of doors and windows, the computer only accurate positioning of fan region in the original frame position to further the design of the plastic window. Based on the design software of a door and window, the concept of convex hull in computational geometry is applied to identify the fan regions in the design of plastic steel doors and windows. The convex hull algorithm is used to analyze the frame coordinates to form a convex hull.Using Delaunay triangulation algorithm for convex hull analysis all triangle region The triangulation network is analyzed and merged, and all the fan regions are finally obtained. The convex hull algorithm can overcome the traditional plastic window cannot identify shaped window design software fan area faults, thus greatly expand the scope of design software.

Automatic recognition method of doors and windows fan area based on convex hull algorithm