New cubic rational basis with tension shape parameters

New cubic rational basis with tension shape parameters
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具有张力形状参数的新三次有理基

DOI:
10.1007/s11766-015-3232-8
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发表时间:
2015-09
影响因子:
1
通讯作者:
Han Xu-li
Han Xu-li
中科院分区:
数学4区
文献类型:
--
作者:
Zhu Yuan-peng;Han Xu-li

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利用开花方法构造了四个新的具有两个形状参数的三次有理类Bernstein基函数,构成了一个归一化的b基,其中三次Bernstein基和三次Said-Ball基作为特例。在此基础上,我们提出了一类具有两个局部形状参数的c2连续三次有理b样条基函数,其中三次非均匀b样条基是一个特例。证明了它们的全正性质。此外,我们将三次有理类bernstein基推广到具有三个形状参数的三角形域,并将三次三角形bernstein - bsamizier基和三次三角形Said-Ball基作为特例。推导了两个补丁连接的g1连续条件。基底中的形状参数作为张力参数,对曲线和贴片的生成具有可预见的调节作用。
By using the blossom approach, we construct four new cubic rational Bernsteinlike basis functions with two shape parameters, which form a normalized B-basis and include the cubic Bernstein basis and the cubic Said-Ball basis as special cases. Based on the new basis, we propose a class ofC2continuous cubic rational B-spline-like basis functions with two local shape parameters, which includes the cubic non-uniform B-spline basis as a special case. Their totally positive property is proved. In addition, we extend the cubic rational Bernsteinlike basis to a triangular domain which has three shape parameters and includes the cubic triangular Bernstein-Bézier basis and the cubic triangular Said-Ball basis as special cases. TheG1continuous conditions are deduced for the joining of two patches. The shape parameters in the bases serve as tension parameters and play a foreseeable adjusting role on generating curves and patches.
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