曲面内腔类零件的反求有别于轮廓外形的反求，主要体现在数据采集的方法，点云的处理，特征点的提取以及曲线的拟合。
The reverse of lumen part is different from outline, such as collect data method, treat with point, pick up feature point and curve fitting.
利用后滤波的原理，对多邻接点时新边界点的选择和轮廓端点的对称合成等问题进行了分析，采用构造拟合曲线查找表进行曲线拟合的方法实现反走样。
By use of the theory of after filter, the problems of selecting new boundary point when several points border upon each other and symmetrical combination for outline points are analyzed.
文中根据曲线曲面型值点，分别用四种参数化方法构造节点矢量，利用NURBS方法反算控制点。
In this paper, the control points are calculated based on the curve or surface's data points and the knot vector which is calculated with four kinds of parameterization by the method of NURBS.
应用推荐