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工程图的识别一直是ＣＡＤ研究领域的难点和热点问题。传统的基于细化的算法本质上是一种局部算法，在细化得到骨架的同时，在分叉点产生变形，并且得不到工程图的整体信息，因此难以满足人们的需要。本文在充分利用工程图整体算法优越性的基础上，提出用最大优先度原则及三个辅助原则来提取剖面线和剖面区域，以减少对后续步骤的干扰，并获得剖面区域的整体信息。本文提出的算法已经实现，在浙江大学ＣＡＤ＆ＣＧ国家重点实验室开发的工程图纸扫描识别系统中得到检验。
Engineering drawing recognition has always been a difficult and hot topic in CAD research. The traditional thinning-based algorithm is essentially a local algorithm, which can not satisfy the needs of the people when the skeleton is refined and at the bifurcation point, and the overall information of the drawing is not obtained. On the basis of making full use of the superiority of the overall algorithm in engineering drawings, this paper proposes to use the principle of maximum priority and three auxiliary principles to extract the section line and section area to reduce the interference to the subsequent steps and get the overall information of section area. The algorithm proposed in this paper has been implemented and verified in engineering drawing scanning recognition system developed by CAD & CG State Key Laboratory of Zhejiang University.