Research on Dynamic Component Image and Trajectory Recognition Method of CAD Electronic Drawing

Aiming at the vectorization problem of 2D project CAD graphics, vectorization algorithm is studied based on graphic description and topological relationship between graphics. A multi-class object instance partition algorithm is studied to realize the automatic recognition of the sub-object instance by using the ring partition feature in the image. The identification of topological relationship between target instances based on connection domain label is proposed. The object instance is identified and divided accurately, and then the connected region is marked to determine the connection line, and then the topological structure of the object graph is obtained. In this way, the geometric and topological information of the target graph can be extracted. Experimental results show that this method can realize the topology recognition of graph objects and graphs well. It has strong robustness to the phenomena such as broken lines and blurring that often appear in graphics. A method for 3D solid modeling is presented. This method will provide a new idea for 3D solid modeling of complex surfaces.