Second,a run length encode(RLE)is computed for the classified image,and a tree-based region find is employed to compute region feature.

• 在区域特征提取阶段,对象素分类所形成的二值图象实现行程编码,产生行程编码映射图,在此基础上,采用一种基于树的区域搜索算法计算出区域特征量。