Locating the Optic Disc in Retinal Images Using Morphological Techniques
نویسندگان
چکیده
A methodology for locating the optic disc (OD) in digital retinal images is presented in this paper. Input images are intensity images (I channel of the HSI color space), resized to have a retinal diameter of 300 pixels. A shade-correction method for homogenizing the background, as well as, a set of morphological opening and closing operations for enhancing bright structures, are applied to find a pixel within OD. The methodology was evaluated on 1200 fundus images from the publicly-available MESSIDOR database, 229 of which present signs of macular edema. In 1190 of these images the distance between the methodology-provided pixel and actual OD center position remained below one standard optic disc radius. These results outperform the reviewed methodologies available in literature that were tested on this same database.
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