本文采用新的弹性约束项，得到的优化方程不但容易计算而且有明确的物理意义，本文讨论了用有限差分法解这个方程的方法，对于复杂形状的轮廓匹配可以用多尺度法来解决。

The solution method is based on a finite difference approach, for which we present convergence characteristics. A multi-smoothing scheme is proposed to improve the convergence of the matching process.

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