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In this paper,an algorithm is proposed to recognize polygons. As a characteristic invariant the affine invariant triangle areas ratio of the same hemline was used to describe the polygon,and the fuzzy theory was applied in its recognition. Firstly,a pair of edges of two polygons—a target polygon and a model polygon for matching beginning was identified by a reinforced local property. Then,the degrees of membership between each pair of edges of two polygons were calculated by a normal school membership function.Lastly, the final result was obtained based on threshold principle and maximum membership principle. The experiment results show that the algorithm is efficient,robust and not susceptible to noise.

A Fuzzy Recognizing Method of polyhedrons under Affine Transformation