基于NURBS自由变形的腿部运动建模方法  

A LEG MOTION MODELING METHOD BASED ON NURBS FREE-FORM DEFORMATION

作　　者：黄海赟[1] 戚飞虎[1] 姚志洪[2] 

机构地区：[1]上海交通大学计算机科学与工程系,上海200030 [2]上海第二医科大学附属瑞金医院计算中心,上海200025

出　　处：《计算机研究与发展》2000年第6期697-702,共6页Journal of Computer Research and Development

基　　金：卫生部B类研究基金!98-2-315

摘　　要：如何建立人体各部分的数字模型是生物医学和计算机工程界较为关心的研究课题．利用基于NURBS的自由变形方法模拟膝关节弯曲和肌肉变形，并在二阶B样条基函数的基础上，依据关节的解剖结构，推导了符合膝关节运动特点和肌肉特性的计算公式．实验证明，采用适当的自由变形网格，利用推导的公式能够获得较好的膝关节弯曲和肌肉变形视觉效果．与采用曲面片插值的方法相比，该方法简单有效，可以方便地应用于人体其它关节的运动建模．Human body modeling is an important research work in the fields of biomedicine andcomputer engineering. On the basis of NURBS FFD (free-form deformation), a motion modelingmethod is discussed to simulate the bend of human leg and corresponding de formations of muscles. Generally, FFD uses a trivariate tensor product spline to transmit deformations, and it is feasible to choose only two-order B-spline basis function in this case. According to the anatomic structure of joints, the simulation formulas are presented, and they coincide with the motion characteristics of knee joint and muscles. In the final experiment, a proper selected lattice space and these formulas yield a good visual effect of simulation. Compared with the method of curved patches, this method is simple and efficient. The formulas can be easily applied to simulate the motion of other joints.

关 键 词：运动建模 自由变形 NURBS曲面 计算机动画 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]