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01-02-2009 | Original Paper

Automatic Tracing of Optic Disc and Exudates from Color Fundus Images Using Fixed and Variable Thresholds

Authors: Ahmed Wasif Reza, C. Eswaran, Subhas Hati

Published in: Journal of Medical Systems | Issue 1/2009

Abstract

The detection of bright objects such as optic disc (OD) and exudates in color fundus images is an important step in the diagnosis of eye diseases such as diabetic retinopathy and glaucoma. In this paper, a novel approach to automatically segment the OD and exudates is proposed. The proposed algorithm makes use of the green component of the image and preprocessing steps such as average filtering, contrast adjustment, and thresholding. The other processing techniques used are morphological opening, extended maxima operator, minima imposition, and watershed transformation. The proposed algorithm is evaluated using the test images of STARE and DRIVE databases with fixed and variable thresholds. The images drawn by human expert are taken as the reference images. The proposed method yields sensitivity values as high as 96.7%, which are better than the results reported in the literature.

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Title: Automatic Tracing of Optic Disc and Exudates from Color Fundus Images Using Fixed and Variable Thresholds
Authors: Ahmed Wasif Reza
C. Eswaran
Subhas Hati
Publication date: 01-02-2009
Publisher: Springer US
Published in: Journal of Medical Systems / Issue 1/2009
Print ISSN: 0148-5598
Electronic ISSN: 1573-689X
DOI: https://doi.org/10.1007/s10916-008-9166-4

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Automatic Tracing of Optic Disc and Exudates from Color Fundus Images Using Fixed and Variable Thresholds

Abstract

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