Fig. 5
From: A mobile app for Glaucoma diagnosis and its possible clinical applications
Key steps for OD localization. a Input retinal image. b Bottom-hat transformation result. c Top-hat transformation result. d Enhanced retinal image by bottom-top-hat transformation. e Brightest region of retinal image. f Extracted blood vessels in green channel. i Fusion image which combined enhanced retinal image with the blood vessels. j Our OD localization result