The research emphasizes on the feature selection in internal-nodes, and designs a new Distance Difference Function.

论文重点研究了决策树内部结点的特征选择方法，设计了一个新的距离差函数。

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Common kernel function RBF only has a local characteristic, with the measurement of the difference in brightness according to the Euclidean distance between pixels of two types.

常用的核函数rbf只具有局部性，根据像素间欧氏距离作为两个类别的亮度差异性测量。

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