From the results of experimentation, the method can make the mark image edge achieve good edge localization and improve the alignment precision.

从实验的结果来看，这种方法能够对对准标记达到很好的边缘定位，提高了对准精度。

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It USES edge localization and curve fitting to solve one dimension displacement field and calculate the error.

面形检测采用边缘定位的方法，并且结合了曲线拟合的方法求解一维位移场来计算误差。

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So in this method, Firstly, using accumulating frame difference, we obtain the exact moving object localization which makes up the incompletely of the edge gotten by the frame difference.

因此，本文算法首先利用累积帧差，弥补了两帧帧差所得边界的不完整性，得到准确的运动对象的定位；

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