Blood Vessel Extraction in Color Retinal Fundus Images with Enhancement Filtering and Unsupervised Classification

Figure 5

Different orientations of Gabor and Gauss kernels used in vessel enhancement.

(a) Gabor kernel with −45°

(b) Gabor kernel with 0°

(c) Gabor kernel with 45°

(d) Gaussian kernel with −45°

(e) Gaussian kernel with 0°

(f) Gaussian kernel with 45°