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Proceedings Paper

Fast localization of optic disc and fovea in retinal images for eye disease screening
Author(s): H. Yu; S. Barriga; C. Agurto; S. Echegaray; M. Pattichis; G. Zamora; W. Bauman; P. Soliz
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Paper Abstract

Optic disc (OD) and fovea locations are two important anatomical landmarks in automated analysis of retinal disease in color fundus photographs. This paper presents a new, fast, fully automatic optic disc and fovea localization algorithm developed for diabetic retinopathy (DR) screening. The optic disc localization methodology comprises of two steps. First, the OD location is identified using template matching and directional matched filter. To reduce false positives due to bright areas of pathology, we exploit vessel characteristics inside the optic disc. The location of the fovea is estimated as the point of lowest matched filter response within a search area determined by the optic disc location. Second, optic disc segmentation is performed. Based on the detected optic disc location, a fast hybrid level-set algorithm which combines the region information and edge gradient to drive the curve evolution is used to segment the optic disc boundary. Extensive evaluation was performed on 1200 images (Messidor) composed of 540 images of healthy retinas, 431 images with DR but no risk of macular edema (ME), and 229 images with DR and risk of ME. The OD location methodology obtained 98.3% success rate, while fovea location achieved 95% success rate. The average mean absolute distance (MAD) between the OD segmentation algorithm and "gold standard" is 10.5% of estimated OD radius. Qualitatively, 97% of the images achieved Excellent to Fair performance for OD segmentation. The segmentation algorithm performs well even on blurred images.

Paper Details

Date Published: 4 March 2011
PDF: 12 pages
Proc. SPIE 7963, Medical Imaging 2011: Computer-Aided Diagnosis, 796317 (4 March 2011); doi: 10.1117/12.878145
Show Author Affiliations
H. Yu, VisionQuest Biomedical, LLC (United States)
The Univ. of New Mexico (United States)
S. Barriga, VisionQuest Biomedical, LLC (United States)
C. Agurto, VisionQuest Biomedical, LLC (United States)
The Univ. of New Mexico (United States)
S. Echegaray, VisionQuest Biomedical, LLC (United States)
M. Pattichis, The Univ. of New Mexico (United States)
G. Zamora, VisionQuest Biomedical, LLC (United States)
W. Bauman, Retina Institute of South Texas (United States)
P. Soliz, VisionQuest Biomedical, LLC (United States)

Published in SPIE Proceedings Vol. 7963:
Medical Imaging 2011: Computer-Aided Diagnosis
Ronald M. Summers; Bram van Ginneken, Editor(s)

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