Based on polygon convex hull method, the chord line is extracted.

采用了基于多边形凸包的方法提取弦线。

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To solve the problems, the minimum internal convex hull algorithm is proposed in this paper. The method holds both low-computational costs and faster calculation speed .

最后，介绍了目前流行的两种投票法，并针对现有投票法的问题和缺点，提出一种最小内凸包的算法。

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