GVF snakes implementation

通过C语言实现梯度矢量流图像分割，比传统的分割效果好很多-Through the C language implementation GVF image segmentation, segmentation results than the traditional lot better

The C++/MEX implementation of Gradient Vector Flow (GVF) is much faster than the Matlab implementation. There is a demo.m file in this package, which shows how to run a simple demo. The package is used by: [1] Quan Wang, Kim L. Boyer, T