An Automatic Cognitive Graph-Based Segmentation for Detection of Blood Vessels in Retinal Images

Figure 2

Inhomogeneity correction results on selected images. (a) shows green channel of randomly chosen images from the DRIVE training, DRIVE testing, ARIA, and STARE datasets, respectively. (b) shows CLAHE results [3, 4]. (c) shows results of Retinex theory on green channel [5]. (d) presents difference between green channel and median blurring of green channel [6]. (e) presents results of our correction method.

(a)

(b)

(c)

(d)

(e)