特征提取：重点是几何特征（环，交叉点，端点）和变换,例子就是这些几何特征的提取。-Feature Extraction : focus on the geometric characteristics (Central, a crossover point, endpoint) and the transformation of these examples is the geometric features are extracted.

特征提取：重点是几何特征（环，交叉点，端点）和变换-Feature Extraction : focus on the geometric characteristics (Central, crossover point, endpoint) and the Transform