本文提出将给定函数或离散坐标点定义的曲线，分段用二次曲线拟合的计算方法。
A new calculation is presented, in which the given functions or curves defined by dispersed coordinate points are approximated by quadratic curve in several parts.
然后利用二次多项式模型拟合文本行的中心线，并建立径向失真校正的目标函数。
Then, it used second order polynomial to fit the Central Line of text line, and constructed the object function of lens distortion.
但二次多项式只能拟合x坐标与Y坐标之间成函数关系的点序列，无法拟合闭合曲线。
But the quadratic curve can be used only in condition when each X-coordinate of the points sequence mapping to only one Y-coordinate, so it can't be used in fitting closing curve.
但二次多项式只能拟合x坐标与Y坐标之间成函数关系的点序列，无法拟合闭合曲线。
But the quadratic curve can be used only in condition when each X-coordinate of the points sequence mapping to only one Y-coordinate, so it can't be used in fitting closing curve.
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