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

Table 1

The effect of different cluster numbers to the performance results using hard and soft clustering after Gabor filter.

	TPR	SPE	ACC
STARE images
Gabor + FCM with 2 clusters	51.59	99.34	95.74
Gabor + FCM with 3 clusters	75.38	96.83	95.18
Gabor + FCM with 4 clusters	87.06	89.79	89.53
Gabor + K-means with 2 clusters	50.37	99.39	95.70
Gabor + K-means with 3 clusters	68.69	98.16	95.94
Gabor + K-means with 4 clusters	84.30	92.05	91.44
DRIVE images
Gabor + FCM with 2 clusters	54.60	99.01	93.34
Gabor + FCM with 3 clusters	67.76	98.59	95.87
Gabor + FCM with 4 clusters	54.50	99.02	93.34
Gabor + K-means with 2 clusters	54.51	99.01	93.33
Gabor + K-means with 3 clusters	61.02	99.05	95.71
Gabor + K-means with 4 clusters	54.44	99.02	93.33