基于ICP和CPD的颅骨自动配准算法  

Algorithm for Automated Skull Registration Based on ICP and CPD

作　　者：白茹意[1] 周明全[1] 邓擎琼[1] 

机构地区：[1]北京师范大学信息科学与技术学院,北京100875

出　　处：《计算机技术与发展》2011年第2期120-122,126,共4页Computer Technology and Development

基　　金：国家自然科学基金重点项目(60736008);国家"863"高技术研究发展计划项目基金(2008AA01Z301);北京市自然科学基金重点项目(4081002)

摘　　要：颅骨配准是计算机辅助的三维颅面复原技术的重要研究内容之一。颅骨配准的准确与否会直接影响到将来颅面复原的准确性。为此,提出一种新的3D颅骨自动配准算法。该算法考虑到颅骨模型的特殊结构与实现的简便性,首先自动提取颅骨不光滑区域的脊线(Crest lines)以及光滑区域的顶点作为特征点,然后利用迭代最近点(ICP)算法进行粗配准,在此基础上,再采用CPD(Coherent Point Drift)算法对颅骨进行精确配准。实验结果表明,该算法能有效提高颅骨配准的准确性并对缺损颅骨具有一定的鲁棒性。Skull registration is important in computer-aided three-dimensional craniofacial reconstruction.The accuracy of the skull registration will directly affect the validity of the reconstruction.In the paper,an automatic method for 3D skull registration is proposed.It consists of three steps.First,some points on the crest lines and the smooth surfaces of the skulls are defined as landmarks in consideration of the special structure of skulls.Then,ICP algorithm is applied to roughly align the two skulls.Finally,a fine registration based on the CPD algorithm is implemented.Experimental results demonstrate that the algorithm can effectively improve the accuracy of the skull registration and is robust in the presence of the partial skull.

关 键 词：配准 特征点 CREST LINES CPD 

分 类 号：TP301.6[自动化与计算机技术—计算机系统结构]