关键词: 图形识别, 二维封闭图形, 图形处理

Abstract: The closed graph information plays an important role in processing graphics.The time effectiveness of recognition for large-scale closed graph in 2D influences the efficiency of the computer aided design.The paper studies the general process of recognition and provides the overall strategy,under which a counterclockwise and clockwise recognition method for single closed graph based on main point is put forward.With the number rules,scanning rules and bintree rules,the efficiency of recognizing large-scale closed graph in 2D in this method is increased.The effectiveness of the method has been proved by the practical application.

Key words: graphics recognition, closed graph in 2D, processing of graphics