Figure 21

Vessel segmentation results for the non-pathological fundus image. The PBLS method[24] after 51 iterations (a), the DRLSE method[25] based on TV approach after 201 iterations (b), the DRLSE method[25] based on oriented Laplacian flow approach after 201 iterations (c), the proposed method based on modified TV approach after 501 iterations (d), and the proposed method based on modified oriented Laplacian flow approach after 501 iterations (e).