According to the feature of contacting measurement, the dissertation first puts forward the twice-sampling planning method for free-form surface in order to improve measuring efficiency.

根据接触测量的特点，为提高测量效率，本文提出了一种两次采样的曲面数字化规划方法。

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Lastly, feature recognition is implemented automatically according to the sequence of regular surfaces, swept surfaces and free-form surfaces.

最后按照规则曲面、扫掠曲面、自由曲面的顺序进行特征的自动识别。

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Based on the feature domain of Data Clouds obtained in the former chapter, this chapter gets its feature points. Finally free-form curves interpolated through these feature points are produced.

在第二章得到特征点云带的基础之上，本章进而得到点云的特征点，并根据这些特征点生成自由曲线，这些自由曲线插值于特征点。

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