Table 2.

Experimental results on the normal group and the abnormal group from DIARETDB0, DIARETDB1, and MESSIDOR using the U-net model trained separately on the fundus images, vessel density maps, composite images and local disc patches.

Datasets	No. of images	Color fundus images				Vessel density maps
		IoU	DSC	Acc	Se	IoU	DSC	Acc	Se
Normal	571	0.875	0.927	0.959	0.920	0.740	0.845	0.936	0.876
Abnormal	845	0.896	0.942	0.970	0.940	0.725	0.834	0.935	0.873
Overall	1416	0.885	0.934	0.965	0.931	0.731	0.838	0.935	0.874
Datasets	No. of images	4-channel composite images				Local disc patches
		IoU	DSC	Acc	Se	IoU	DSC	Acc	Se
Normal	571	0.899	0.943	0.968	0.938	0.904	0.947	0.970	0.944
Abnormal	845	0.887	0.935	0.964	0.928	0.894	0.941	0.964	0.932
Overall	1416	0.892	0.939	0.966	0.932	0.898	0.944	0.967	0.937