The paper proposes an optic disc localisation method in color retinal images. It is a first step of a retinal image analysis project which will be completed later with other tasks as fovea detection and measurement of retinal vessels. The final goal is to detect in early stages signs of ophthalmic pathologies as diabetic retinopathy or glaucoma, by successive analysis of ophthalmoscopy images. The proposed method first detects in the green component of RGB image the optic disc area and then on the segmented area extracts the optic disc edges and obtains a circular optic disc boundary approximation by a Hough transform.
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