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分析了徒手画曲线的性质，提出了徒手画曲线的主曲线概念，并提供了一种搜索该主曲线的折线逼近算法，自适应地得到主曲线；
This paper analyzed the character of sketch curve and developed the concept of principal curve of sketch curve, and provided an adaptive algorithm by polygonal line for approximating principal curve.
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