The complexity analysis of the fixed window algorithm and the optimal length of window are also discussed.

最后给出了固定窗口算法的复杂性分析，并讨论了窗口宽度的最佳选取。

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Additionally the algorithm has the optimal time and space complexity.

此外，这种算法具有最优的时间和空间复杂性。

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Therefore, there is no algorithm with polynomial computational complexity that guarantees optimal motion vectors.

因此，没有一个多项式(计算的复杂性)算法可以保证最优运动向量。

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