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- W2108516079 abstract "To overcome the weakness of a total variation based model for image restoration, various high order (typically second order) regularization models have been proposed and studied recently. In this paper we analyze and test a fractional-order derivative based total $alpha$-order variation model, which can outperform the currently popular high order regularization models. There exist several previous works using total $alpha$-order variations for image restoration; however first no analysis is done yet and second all tested formulations, differing from each other, utilize the zero Dirichlet boundary conditions which are not realistic (while non-zero boundary conditions violate definitions of fractional-order derivatives). This paper first reviews some results of fractional-order derivatives and then analyzes the theoretical properties of the proposed total $alpha$-order variational model rigorously. It then develops four algorithms for solving the variational problem, one based on the variational Split-Bregman idea and three based on direct solution of the discretise-optimization problem. Numerical experiments show that, in terms of restoration quality and solution efficiency, the proposed model can produce highly competitive results, for smooth images, to two established high order models: the mean curvature and the total generalized variation." @default.
- W2108516079 created "2016-06-24" @default.
- W2108516079 creator A5045773186 @default.
- W2108516079 creator A5084188467 @default.
- W2108516079 date "2015-09-06" @default.
- W2108516079 modified "2023-09-25" @default.
- W2108516079 title "A Total Fractional-Order Variation Model for Image Restoration with Non-homogeneous Boundary Conditions and its Numerical Solution" @default.
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- W2108516079 doi "https://doi.org/10.48550/arxiv.1509.04237" @default.
- W2108516079 hasPublicationYear "2015" @default.
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