Fig. 1. Comparison of extracted results of green channel and other channels. (a) Color fundus image; (b) red channel; (c) green channel; (d) blue channel

Fig. 2. Flow chart of proposed method

Fig. 3. Images of pre-processing results. (a) Color fundus image; (b) green channel; (c) expansion of region of interest in Fig. 3(b); (d) image enhancement of Retinex in Fig. 3(c)

Fig. 4. Normalized results of Hessian matrix feature. (a) Color fundus image; (b) fundus image of green channel of Fig. 4(a); (c) maximal eigenvalue feature image of Hessian matrix of Fig. 4(b)

Fig. 5. Normalized results of Gabor wavelet transform features at different scales. (a) a=2; (b) a=3; (c) a=4; (d) a=5

Fig. 6. Segmentation results of proposed method on DRIVE database. (a) Color fundus image; (b) fundus image of green channel of Fig. 6(a); (c) expert manual segmentation image; (d) segmentation image of proposed method; (e) segmentation image of Gabor-SVM experiment

Fig. 7. Comparison of partial retinal segmentation images. (a) Complete segmentation image; (b)-(d) partial segmentation images of Fig. 7(a)