Table 2.

Performance of DRIVE Database—morphological based and local normalized illumination correction

Image	Morphological based illumination correction (%)			Local normalized illumination correction (%)
	Sensitivity	Specificity	Accuracy	Sensitivity	Specificity	Accuracy
1	85.06	97.47	96.42	80.71	96.78	95.60
2	89.00	97.75	96.73	83.88	96.15	95.17
3	88.82	94.63	94.16	81.80	94.85	94.03
4	84.48	97.53	96.23	85.44	95.87	95.22
5	92.10	96.74	96.36	85.40	95.62	94.99
6	91.05	96.51	96.05	85.00	95.09	94.48
7	89.70	97.19	96.55	82.58	95.93	95.07
8	87.84	96.68	96.01	83.71	95.46	94.86
9	89.55	96.79	96.34	83.38	96.17	95.48
10	87.04	98.00	97.11	81.21	96.61	95.65
11	85.48	97.73	96.68	78.31	96.02	94.83
12	85.70	95.93	95.25	82.07	96.13	95.27
13	89.06	97.62	96.78	83.49	95.95	95.05
14	80.90	98.21	96.69	77.49	96.21	95.12
15	82.10	97.67	96.67	74.80	97.30	95.91
16	86.15	97.37	96.40	83.40	96.48	95.58
17	84.70	96.84	95.92	81.70	96.44	95.52
18	83.08	97.86	96.68	79.54	97.04	95.90
19	86.03	98.54	97.47	82.32	97.41	96.33
20	82.72	98.02	96.93	78.15	97.22	96.07
Average	86.53	97.25	96.37	81.72	96.24	95.31