A method of field calibration technique for wheelset profile non-contact measurement was proposed by using second-order polynomial warping technique.
本文利用二元二次多项式变形技术，提出了一种轮对外形尺寸非接触测量的现场标定方法。
In this case, a method based on two -dimension second - order polynomial is proposed to fit and remove the brightness value of background.
针对这种情况，提出了基于二维二阶多项式拟合并去除不均匀背景的方法。
The method presented in this paper is not to approximate directly with Newton iterate the roots of a polynomial but to approximate its second order factors.
本文提出的这种方法，它的特点在于：我们不是用牛顿迭代法去直接逼近方程的根，而是用牛顿迭代法去逼近方程的二次因子。
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