三次曲线法

自动边界数据采集系统是用梯度边缘追踪法自动获取左室内膜边界的曲线点，使用三次曲线插值法及最小二乘法拟合整条左室边界曲线。

The system of automatic boundary data acquisition can obtain the curve data of the endocardium boundary of left ventricle with the tracing algorithm of the gradient image edge . An entire left endocardium boundary is fitted with the cubic curve interpolation method and the least-square method respectively .

螺杆转子模具设计的三次样条曲线法；

The design of rotors ' model method by the cubic spline ;

三次曲线牛顿分类法的研究

The Coordinate Systems for Standard Equations of Cubic Curves Newton 's Classification

结论三次项曲线对MTS法细胞毒试验的细胞数OD关系有很高拟合度且优于线性曲线模型。

CONCLUSION For the relations of cell number-OD in MTS cytotoxicity assay , the fitness of cubic curves are better than the linear model .