关键词: 矢量化, 图形识别, 拓扑表示, 圆弧角

Abstract: The representation and recognition for graphical objects plays an important role in engineering drawings.The paper presents a method about representation and recognition for graphical objects based on the topological，which can obtain the vectors for all the graphical objects by vectorization.Then the topological relations between the graphical objects are defined by the zone of influence for vectors，which can provide some information for interpretation the engineering drawings.Finally an application，recognition for mini arcs，is also presented as case in point.The algorithm is also be evaluated by the experiments using benchmark data and real drawings.The experiments indicate that the algorithm is fast and effective.

Key words: vectorization, graphic recognition, topological representation, mini arc