GAC模型是基于边缘的图像分割方法，当图像中的对象和背景的边界处灰度值存在较大差异，那么对象的边缘就将形成明显的轮廓。-GAC model is based on the edge of the image segmentation method, when the boundary of the object and background in the image gray value differences greatly, so the edge of the object will fo