最小旋转标架下的虚拟内窥镜自动漫游方法  

Virtual Endoscopy Automatic Navigation Method Based on Rotation Minimizing Frames

作　　者：潘晓[1] 周元峰[1] 高珊珊[2] 徐铭泽[1] 

机构地区：[1]山东大学计算机科学与技术学院,济南250101 [2]山东财经大学计算机科学与技术学院,济南250101

出　　处：《计算机辅助设计与图形学学报》2015年第8期1548-1554,共7页Journal of Computer-Aided Design & Computer Graphics

基　　金：国家自然科学基金(61202148;61373078;61402261);山东省优秀中青年科学家奖励基金(BS2013DX041;BS2013DX048)

摘　　要：为了准确地提取虚拟内窥镜的漫游路径,消除漫游过程中视觉上的画面旋转的现象,提出一种结合骨架提取与路径优化的虚拟内窥镜自动漫游方法.首先采用一种基于体素密度值加权的最短路径生成算法,在细化后的三维医学影像数据初始骨架上提取简单漫游路径;然后采用三次B样条曲线拟合方法得到最终的漫游路径;在沿此路径漫游时,通过计算最小旋转标架来优化虚拟摄像机的向上矢量,并设定向上矢量角度旋转阈值对漫游路径进行动态重采样,优化虚拟摄像机的位置参数.实验结果证明,该方法能提取准确的虚拟内窥镜漫游路径,并能获得较好的漫游视觉效果.In order to accurately extract the navigating path of virtual endoscopy and eliminate the rotation of visual images in the navigating process, a method for virtual endoscopy automatic navigation that combines skeleton extraction and path optimization is presented in this paper. Firstly, a shortest path generation algorithm based on weighted voxel density is adopted to calculate the simple navigating path from the skeleton of the 3D medical imaging data. Then, the final navigation path is generated by fitting cubic B-Spline curve. In the navigating process, the up vector of the virtual camera is optimized by calculating the minimal rotation frames for navigating path curve. In order to limit rotation angle variation of the up vector, we re-sample the view points on the navigating path by a given threshold dynamically. Experimental results show that the new method can extract accurate navigating path, and give good navigating visual effect.

关 键 词：虚拟内窥镜 漫游路径 动态采样 最小旋转标架 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]