中文说明：本程序是关于水平集的图像分割，对目标背景单一的图像效果较好。对于医学图像的水平集分割能够体现出这种方法的显著优势，因为大部分的医学图像的背景部分比较单一，只是在灰度上有差别，水平集方法利用了能量演变的方法进行分割，分割的结果图像中边缘的角度是零，而边缘内外的角度是正负分明的，这样为背景的进一步处理提供了方便。
English Description：
This procedure is about the level set of image segmentation, the target background of a single image effect is better. Level set segmentation for medical images can reflect the significant advantages of this method, because most of the medical image background part is relatively single, only in the gray level difference, level set method uses the energy evolution method for segmentation, the segmentation result of the image edge angle is zero, and the angle inside and outside the edge is positive and negative, so as to improve the background Step processing provides convenience.