Table 2.

The r values from the contrast enhancement techniques performed on the DRIVER images

Image	Algorithm [22]	Algorithm [16]	Wiener filter + CLAHE on red channel	Wiener filter + CLAHE on blue channel	Proposed algorithm
1	0.62421	0.48095	0.78545	0.69862	0.33342
2	0.59165	0.45491	0.77342	0.67109	0.31368
3	0.63252	0.43843	0.83461	0.77519	0.30788
4	0.59941	0.39935	0.78342	0.73858	0.28008
5	0.59358	0.46099	0.76497	0.69451	0.31958
6	0.58881	0.47032	0.78863	0.67048	0.32474
7	0.61253	0.40088	0.83583	0.71944	0.28282
8	0.56518	0.42707	0.75623	0.70643	0.29528
9	0.63529	0.44092	0.84241	0.7332	0.3074
10	0.59614	0.42363	0.74483	0.71643	0.29948