Effective recognition approach to assembly drawings
Yong-Qing Cheng, Jingyu Yang · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 1990
Automatic recognition of mechanical assembly drawings is very difficult problem in drawing recognition. So far many problems have not been solved. In this paper graphic algebra expressions are presented to describe part symbols and a new recognition method: serial numberleader linepart symbol correspondence is described to recognize assembly drawings. This recognition process is summarized as follows: First the assembly drawing is read by a scanner and translated into gray image data. Next serial numbers are separated from the image data. Recognized serial numbers are used to determine starting points of leader lines. A topologybased tracking algorithm is proposed to recognize a variety of leader lines find the corresponding part symbols. Finally the topological trackingmatching algorithm is built to track and recognize assembly drawings in terms of a generotortesting process of primitives. Because algebra expression of the part symbol covers lots of semantic features about the part symbol the tracking process is simultaneous with the recognition process. The above recognition method is implemented in our automatic recognition system . The experimental results show that our method is effective and isn''t affected by complex degree of assembly drawings.