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| Microaneurysms Detection in Fundus Image Based on Phase Congruency |
1 School of Electronics and Information Engineering,Tianjin Polytechnic University,Tianjin, 300387, China
2 Tianjin Medical University Eye Hospital, Tianjin, 300384, China
3 Tianjin Medical University Metabolic Disease Hospital, Tianjin, 300070, China |
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Abstract The presence of microaneurysms in the retina is the earliest clinical symptom of diabetic retinopathy(DR), thus their reliable detection is essential in the DR screening system. Based on phase congruency, this paper proposes a new microaneurysms detection method. The first step aimed at obtaining microaneurysms candidate regions achieved by using phase congruency. Then the irrelevant information, such as the vessel fragments, was removed by constructing directional crosssection profiles. Through testing on 50 fundus images provided by ROC website, the method achieved a sensitivity of 94%, specificity of 100%, and accuracy of 96% at the image level, respectively. This method can accurately get microaneurysms in color fundus images, and it is insensitive to image brightness and contrast.
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