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• W2554946065 abstract "Accurate and reliable optic disc (OD) segmentation is important for retinal image analysis and retinal disease screening. This paper presents a novel method to automatically segment OD in fundus images based on variational model with multiple energies. Firstly, a sparse coding based technique is designed to localize the OD center, based on which an initial boundary curve is then estimated by a circular Hough transform. Next, OD segmentation is regarded as an energy minimization problem, and a variational model integrating three energy terms is proposed to evolve the curve to the OD boundary. In the proposed model, the first term, named phase-based boundary energy, is designed to attract the evolution curve to the OD boundary, even the one with low contrast; the second term, named PCA-based shape energy, constraints the evolution curve to a common OD shape, which can suppress the negative effect of bright interferences, e.g., the bright lesions and myelinated nerve fibers, in OD segmentation; the last one is the region energy, which drives the evolution curve to the boundary of the homogeneous regions and hence improve the robustness of the model to the noises boundary and the initial position of evolution curve. The proposed OD segmentation method is evaluated on three public available databases, i.e., the MESSIDOR, ONHSD and DRIONS databases, and the experimental results demonstrate that the proposed method outperforms the state-of-the art techniques. HighlightsA sparse coding based method is designed to localize the optic disc (OD) in fundus image.Variational model integrating three energy terms is proposed to segment OD boundary.Phase-based edge stop function is designed in the boundary energy.The proposed method is evaluated and analyzed on three public databases and outperforms the state-of-the-art approaches." @default.
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• W2554946065 date "2017-04-01" @default.
• W2554946065 modified "2023-10-16" @default.
• W2554946065 title "Optic disc segmentation based on variational model with multiple energies" @default.
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• W2554946065 doi "https://doi.org/10.1016/j.patcog.2016.11.017" @default.
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