颜色分类处理使用特征函数，可以减少颜色坐标转换运算，提高颜色分类速度。
Characteristic function is used for color classification, which can reduce the operation of color coordinate conversion and improve the speed of color classification.
在实时图像分割的过程中，利用特征函数实现图像坐标集合划分简便快捷。
In the process of the real-time image partition, using the eigenfunction to realize the partition of image coordinate set is very convenient and easy.
提出了一种利用图像特征空间信息的核函数——层次对数极坐标匹配核，用于遥感图像建筑物目标的分类。
This paper proposes a kernel function - hierarchical log-polar matching kernel which making use of the feature spatial information for building classification in remote sensing images.
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