Comparative Study of Retinal Vessel Segmentation Based on Global Thresholding Techniques

Figure 5

Shows different segmentation results obtained through CLAHE with different filters using Otsu thresholding technique. Images (d1), (e1), and (f1) are DRIVE database gold standards. Images (d2), (e2), and (f2) are images segmented using Otsu threshold with Gaussian filter. Images (d3), (e3), and (f3) are images segmented using Otsu threshold with average filter. Images (d4), (e4), and (f4) are images segmented using Otsu threshold with adaptive filter. Images (d5), (e5), and (f5) are images segmented using Otsu threshold with combination of average and Gaussian filters.