逆向工程中孔洞的分段填充方法研究

The research of a piecewise hole filling in Reverse engineering

由于物体曲面形状复杂和扫描设备的原因,扫描得到的点云中难免有孔洞出现。为产生封闭的实体曲面,需要对孔洞进行填充。国内外许多学者提出了许多关于孔洞填充的算法,不过这些算法主要针对曲率较小区域的孔洞。这里提出了一种新的改进算法,解决了高曲率区域的复杂孔洞填充问题。通过将复杂孔洞分割成许多简单子孔洞,再将各子孔洞分别填充,完成复杂孔洞填充。最后对孔洞填充区域进行光顺和细化处理,并更新其拓扑信息。

While scanning a part in reverse engineering, it is very hard to get all the point clouds of the object owing to the complex surfaces and the poor precision of the scanning equipment, so holes occur in the point clouds. Holes must be filled in order to acquire airtight surfaces. A lot of algorithms contributing to fill holes in the smooth areas have been advanced in recent years. A new algorithm is given in this paper to solve the holes filling in the areas of high curvature. It splits the complex holes into many simple sub - holes, and holes can be filled after all simple sub - holes being filled. At last, holes can be enhanced by the techniques of smoothing and subdividing, and the topology information can be update.