A method of field calibration technique for wheelset profile non-contact measurement was proposed by using second-orderpolynomial 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。
2
In this case, a method based on two -dimension second - orderpolynomial 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。
3
The method presented in this paper is not to approximate directly with Newton iterate the roots of a polynomial but to approximate its secondorder factors.