中文说明：对TM灰度图像进行基于梯度幅度的分水岭变换分割，并标记分割区域边界，matlab源代码，直接拷贝至matlab中运行。
English Description：
TM gray image is segmented by watershed transform based on gradient amplitude, and the boundary of segmentation area is marked. Matlab source code is directly copied to matlab to run.