型值点反算控制点要解线性方程，画样条曲线，常用三次多项式参数曲线构造，保持一阶或二阶导数连续。-Data points Inverse control point to solving linear equations, draw splines, commonly cubic polynomial parametric curves constructed, maintained a first or second derivative continuous.

采用二次型多项式模拟出噪声，在采用RLS算法对图像噪声进行校正(The quadratic polynomial is used to simulate the noise, and the RLS algorithm is used to correct the image noise.)