基于工程图三维重建中的预处理与信息提取技术研究*

提出了基于边界表示B-rep方法的工程图三维重建中对于二维工程图纸进行预处理和信息提取的一系列实用算法,涉及到工程图读入、实体过滤、视图分离、视图坐标规格化以及视图数据处理等流程.不但可以快速准确地获得二维工程视图中完备的几何信息和拓扑信息,而且处理对象并不局限于标准的工程三视图,对于工程一视图、二视图同样可以处理.这些算法已经应用于一个CAD原型系统并取得了较好的效果,为后续的三维重建工作提供了良好的基础.

Research on Pre processing and Information Extracting for 3D Reconstruction from Engineering Drawings

A series of practicable algorithms of preprocessing and information extracting from 2D engineering drawings was presented within 3D reconstruction based on B-rep method.These algorithms involved the whole course of preprocessing,including engineering drawings import,entity filter,views separation,coordinate standardization and views data process.By using these algorithms,it can not only obtain complete geometrical and topological information of the views,but also can deal withnon-orthographic views.It had been experimented in one CAD prototype system and shown to embody higher efficiency and practicability.