Some of the most popular function point estimation methods include ESTIMACS and SPQR/20.

最流行的功能点评估方法有 ESTIMACS 和 SPQR/20。

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Other preprocessing methods such as discrete curvature estimation and feature point extraction are also studied, and a section-feature recognition algorithm, based on curve fitting, is proposed.

研究了用圆弧曲率估算截面数据离散曲率的方法和特征点提取方法，提出了基于曲线拟合的截面特征识别方法。

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For the lack of point target and line detection in the above mentioned methods, a new parameter estimation method is then introduced.

由于以上方法无法检测点、线目标，本文提出了一种新的参数估计方法。

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