基于曲率特性的牙齿三维模型匹配方法研究
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摘要
为提高无标志点情况下牙齿锥形束CT与蓝光扫描三维模型匹配精度,提出了依据曲率特性选取对应点集的匹配方法。取基准模型中三点为基准点,以各基准点的曲率值为特征评价标准,提取出待匹配模型中与基准点曲率值相近似的点作为特征点;通过约束条件,从特征点中进一步选取出与基准点对应的匹配点;利用三点平移变换法计算旋转矩阵R及平移矢量t,从而实现基准模型与匹配模型的初匹配。通过实例仿真验证了所提算法的准确性和有效性。
In order to improve the matching accuracy of teeth cone beam CT and blue light scan three-dimensional model without index point,a match method based on curvature characteristics selected corresponding point is put forward.First,3 points from reference model are taken as datum points,and the curvature value of each datum points is set as characteristic evaluation standard,points on the match model as feature points whose curvature value is similar to that of the datum points.Furthermore,corresponding matching points are selected to feature points under constraints followed by using three points translational and transformation method calculations rotation matrix R and translation vector t to match reference model and match model.The results of the simulation experiment verify the proposed algorithm accuracy and effectiveness.
In order to improve the matching accuracy of teeth cone beam CT and blue light scan three-dimensional model without index point,a match method based on curvature characteristics selected corresponding point is put forward.First,3 points from reference model are taken as datum points,and the curvature value of each datum points is set as characteristic evaluation standard,points on the match model as feature points whose curvature value is similar to that of the datum points.Furthermore,corresponding matching points are selected to feature points under constraints followed by using three points translational and transformation method calculations rotation matrix R and translation vector t to match reference model and match model.The results of the simulation experiment verify the proposed algorithm accuracy and effectiveness.
引文
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[3]TANG Min,GUO Hongming.The precision research of thethree-dimensional model of integration teeth and jaw[J].Bei-jing Oral Medicine,2011,19(3):128-130(in Chinese).[唐敏,郭宏銘.三维整合牙颌模型的精度研究[J].北京口腔医学,2011,19(3):128-130.]
[4]LIU Yunfeng,XU Junhua,DONG Xingtao,et al.To achieveprecise kind of tooth of modern design and manufacturing tech-nology[J].Journal of Mechanical Engineering,2010,46(5):150-157(in Chinese).[刘云峰,徐俊华,董星涛,等.实现精确种牙的现代设计与制造技术[J].机械工程学报,2010,46(5):150-157.]
[5]Swennen G R J,Mommaerts M Y,Lamoral J P.A cone-beamCT based technique to augment the 3Dvirtual skull model with adetailed dental surface[J].Int J Oral Maxillofac Surg,2009,38(1):45-57.
[6]Bong Chul Kim,Chae Eun Lee,Wonse Park.Integration accu-racy of digital dental models and 3-dimensional computerizedtomography images by sequential point and surface based mark-erless registration[J].Oral Surg Med Oral Pathol Oral RadiolEndod,2010,110(3):370-378.
[7]TANG Zongjun,WANG Xinlei,WANG Yuning,et al.STLfile topology reconstruction method research[J].ComputerApplication Technology,2009,36(4):53-55(in Chinese).[唐宗军,王新雷,王宇宁,等.STL格式文件的拓扑重建方法研究[J].计算机应用技术,2009,36(4):53-55.]
[8]YANG Guang,LIU Weijun,WANG Wei,et al.STL file topo-logy reconstruction and rapid slicing algorithms research[J].Modern Manufacturing Engineering,2009(10):32-35(inChinese).[杨光,刘伟军,王维,等.STL格式文件拓扑重建及快速切片算法研究[J].现代制造工程,2009(10):32-35.]
[9]LI Jian,YAN Bin,WANG Lin.Digital 3D model of teeth andjaw teeth boundary automatic extraction[J].Oral Medicine,2008,28(7):347-349(in Chinese).[李剑,严斌,王林.数字化三维牙颌模型中牙齿边界的自动提取[J].口腔医学,2008,28(7):347-349.]
[10]LI Hong.Based on the three datum point cloud splicing align-ment method[J].Tool Technology,2011,45(9):55-58(in Chinese).[李宏,基于三个基准点的点云拼接对齐方法[J].工具技术,2011,45(9):55-58.]
[11]ZHANG Shusen,LI Wei,CHEN Junting.Based on the re-verse engineering of three dimensional measuring point clouddata and CAD model registration algorithms research[J].Manufacturing Technology and Machine Tool,2008(3):114-117(in Chinese).[张树森,李玮,陈俊廷.基于逆向工程的三维测量点云数据与CAD数模配准算法研究[J].制造技术与机床,2008(3):114-117.]
[12]YIN Sufeng,HUANG Jianghang,ZENG Yuepeng,et al.Re-verse engineering based on double triangulation more apparentsplicing[J].Mechanical Engineering and Automation,2008(6):37-39(in Chinese).[殷素峰,黄江航,曾月鹏,等.反求工程中基于双三角测量的多视拼接[J].机械工程与自动化,2008(6):37-39.]