Abstract
Glaucoma is the second largest cause of permanent blindness all over the world. Glaucoma is marked by change in shape and size of optic disc (OD) and optic cup (OC). Contrast enhancement is necessary to improve the visuality of OD and OC in images for early detection, screening and timely treatment planning of glaucoma. Morphological filters are adapted for the contrast enhancement of the retinal fundus images. Combination of morphological filters such as top-hat transform and bottom-hat transform are considered for enhancement of retinal fundus images. The quality of the improvement of the image can be determined by the use of measure of enhancement (EME). The resultant enhanced images have been obtained with the increased value of EME indicating that enhancement has been done.
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