用于2维、3维的血管图像增强，根据的理论为Frangi提出的Vessel enhancement diffusion。-2D and 3D vessel enhancement filter acording to Vessel enhancement diffusion proposed by Frangi 2001

利用itk写的一个通用模板类，用于做3维血管的增强，根据的理论为Frangi提出的Vessel enhancement diffusion。-3D Vessel enhancement filter programmed by c++ and itk lib, acroding to Vessel enhancement diffusion proposed by Frangi 2001.