Lastly, the characteristic points can be extracted by the geometry definition of them and the position and curvature of each point on the contours.
根据特征点的几何定义，利用轮廓线的位置信息、曲率等属性来提取特征点。
Characteristic points can be extracted by considering the geometry definition, the position and curvature of each point on the contours.
然后根据特征点的几何定义，利用轮廓线的位置、曲率等信息自动提取特征点。
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