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

数字减影增强处理血管造影图像，可以处理眼底视网膜DSA图像-Digital subtraction angiography image enhancement processing, can handle the retinal image DSA