面向颅骨损伤修补的缺损重建算法  

Missing Entity Hole Repairing Algorithm of 3D Closed Triangle Mesh

作　　者：姚远[1] 杨红飞[1] 胡庆夕[1] 

机构地区：[1]上海大学快速制造工程中心,上海200444

出　　处：《湖南工业大学学报》2008年第1期41-46,共6页Journal of Hunan University of Technology

基　　金：国家自然科学基金资助项目(60703029);上海市优秀青年科研专项基金资助项目(B.37-0109-07-011)

摘　　要：提出一种针对颅骨缺损重建模型的孔洞修复算法,根据孔洞特征自动提取缺损边缘。通过双环采样,投影构建代理曲面;通过合并环间区域及引入边缘约束的平滑,得到缺失实体孔洞的上下缝合面。在此基础上,搜索出上下边界环之间的三角网格区域,利用几何约束条件重建缺失实体。算法能最大限度的减少人工交互步骤,符合需要的修补结果。A hole repair algorithm for skull defect repair is put forward. From the input of a set of guide points, the upper boundary ring for the hole is searched according to edge features and the position of the objective point. The expanded ring is obtained by the expansion of the upper ring along the gradient direction. And the boundaries of objective regions are recognized, while the region between this two rings is obtained. Based on two samples rings, the lower boundary ring is constructed by the inward expansion of the upper ring, and the region between the upper and lower rings is identified. Then the lower patching surface is constructed by using geometric constraints. The repair entity is constructed by stitching the upper patching surface, lower patching surface, and the region between the upper ring and lower ring. The algorithm can minimize the manual interaction steps and produce a satisfied repair result.

关 键 词：颅骨补缺 孔洞修复 轮廓环扩展 映射平滑 缝合面 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术] R683[自动化与计算机技术—计算机科学与技术]