POLAR TRANSFORM FOR SEGMENTATION OF OPTIC DISK IN FUNDUS IMAGES
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Abstract
A method to detect and segment optic disk (OD) in fundus eye images using polar transform present is presented in this paper. Optic disk is the small blind spot on the surface of the retina which generally appears elliptical in shape. Blood vessels present in the retina converge towards the optic disk and may lead to segmentation errors because the pixels representing the blood vessels may be misinterpreted as the pixels belonging to the optic disk. As the OD region is highly pronounced in the red channel image, it is alone considered in this work for segmenting the OD. As an additional step the morphological operations are applied to suppress the blood vessels further. Since the optic disk has big similarities with the spiral coordinate system, in this paper adaptive polar transform is proposed to detect the optic disk pixels and the subsequently the OD region is approximated by fitting an eclipse. The proposed algorithm comprises of three steps. (1) Pre-processing, (2) Forward and inverse polar transformation, (3) Optic Disk detection. The proposed methodology is tested on two different publicly available datasets namely DRIVE and STARE datasets.
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