断层测量反求工程中的封闭轮廓集分割技术

针对由序列断层测量轮廓的三维重建，提出了基于物体结构特征的封闭轮廓集分割算法。算法中首先采用多边形的包含判定、封闭轮廓截面属性（如面积、形心位置、内外属性等）的比较对轮廓进行粗略分割，若不能分割出唯一轮廓时，进而通过轮廓串比较的方法作出筛选。为了解决复杂结构的轮廓集分割，算法同时采用了分段重构与拼合的分割策略，结果表明，文中的算法不仅分割速度快，分割轮廓准确，而且适用于具有复杂形状和结构的零件。

Closed Contour Segmentation for Layered Measuring Based Reverse Engineering

A new algorithm, which can extract closed contour set according to the structure of a part from series of measured layers, was presented. It contains three procedures: inclusion test of two polygons, loop properties (such as area, center of form, outer or inner loop classification) computing and curvature based comparison. In order to make the algorithm fit for the parts with complex structures, the strategy of piecewise segmentation was used. The experiments show that the algorithm extracts contours rapidly and precisely, and can handle very complex parts.