Figure 11

Preprocessing step and segmentation of non-pathological retinal fundus image obtained from DRIVE dataset. The smoothed image using the scalar approach[19, 38](a), the image generated by subtracting the original green channel image from the smoothed one (b), the sharpened image (c), the estimated intensity inhomogeneity image obtained by using the median filter (d), the corrected image (e), and segmented image using the proposed structure-based level set segmentation method after 61 iterations (f).