Effects of preprocessing eye fundus images on appearance based glaucoma classification

Authors:
Jörg Meier;Rüdiger Bock;Georg Michelson;László G. Nyúl;Joachim Hornegger
Affiliations:
Institute of Pattern Recognition, University of Erlangen-Nuremberg, Erlangen;Institute of Pattern Recognition, University of Erlangen-Nuremberg, Erlangen;Department of Ophthalmology, University of Erlangen-Nuremberg, Erlangen;Institute of Pattern Recognition, University of Erlangen-Nuremberg, Erlangen;Institute of Pattern Recognition, University of Erlangen-Nuremberg, Erlangen
Venue:
CAIP'07 Proceedings of the 12th international conference on Computer analysis of images and patterns
Year:
2007

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Abstract

Early detection of glaucoma is essential for preventing one of the most common causes of blindness. Our research is focused on a novel automated classification system based on image features from fundus photographs which does not depend on structure segmentation or prior expert knowledge. Our new data driven approach that needs no manual assistance achieves an accuracy of detecting glaucomatous retina fundus images compareable to human experts. In this paper, we study image pre-processing methods to provide better input for more reliable automated glaucoma detection. We reduce disease independent variations without removing information that discriminates between images of healthy and glaucomatous eyes. In particular, nonuniform illumination is corrected, blood vessels are inpainted and the region of interest is normalized before feature extraction and subsequent classification. The effect of these steps was evaluated using principal component analysis for dimension reduction and support vector machine as classifier.