本文提供了一些简单有效的方法，反求曲线上该点的参数和内权因子，避免了数值计算的不稳定性。

This paper provides some simple and efficient methods for inversely solving the parameter of the point and the inner weight, which avoid the instability in numerical calculation.

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但是短程线主动轮廓模型的能量函数及其解法存在很多局限性，如数值计算的不稳定性和控制点存在不收敛的可能性等等。

Nonetheless, the energy function of the GACM and its solving algorithm has many restrictions, such as instability of numerical computation, probability of divergence of control points.

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