and split. Although this topological constraint may be reasonable in the segmentation of the liver, it would certainly be undesirable when segmenting blood vessels in an MR image. An algorithm to overcome these diculties was rst introduced by

两个简单的遍历，供MATLAB基础人员使用，主要是两种遍历方法，Z曲线和Hilbert曲线-Two simple traversal, for the use of MATLAB foundation staff, mainly two kinds of traversal methods, Z curve and Hilbert curve