Title: Auto detection of optic nerve head using improved directional optimal filter

Authors: V. Krishna Sree; P. Sudhakar Rao

Addresses: VNR Vignana Jyothi Institute of Engineering and Technology, Bachupally, Hyderabad-500090, India. ' VNR Vignana Jyothi Institute of Engineering and Technology, Bachupally, Hyderabad-500090, India

Abstract: This paper proposes an automatic detection method of optic nerve head (also called optic disk) using two dimensional improved directional matched filter with improved pre-processing and post-processing techniques. The blood vasculature is removed using optimised Gaussian filter after normalising retinal fundus images using an adaptive histogram equalisation technique. The blood vessel segmentation is improved by adopting a thresholding technique based on blood vessel properties. Then optic disk is extracted from the retinal fundus image and its area is calculated. Classification of normal and abnormal images is carried out based on the optic disk properties.

Keywords: retinal fundus images; optic disks; matched filters; blood vessels; optic nerves; optic nerve heads; automatic detection; image segmentation; thresholding; image classification; diabetic mellitus; diabetes; eyes; diabetic retinopathy; glaucoma.

DOI: 10.1504/IJMEI.2012.046979

International Journal of Medical Engineering and Informatics, 2012 Vol.4 No.2, pp.157 - 164

Published online: 11 Aug 2014 *

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