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Inverse Scale Spaces for Nonlinear Regularization

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Abstract

Error minimization of global functionals provides a natural setting for analyzing image processing and regularization. This approach leads to scale spaces, which in the continuous formulation are the solution of nonlinear partial differential equations. In this work we derive properties for a class of inverse scale space methods. The main contribution of this paper is the development of a proof that the methods considered are convergent for convex regularization operators. The proof is based on energy methods and the Bregman distance. Further, estimates for convergence toward a clean image with noisy forcing data is provided in terms of both the L 2 norm and Bregman distances. This leads to natural estimates of optimal stopping scale for the inverse scale space method. These analytical results are discussed in the context of a numerical example.

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Correspondence to Johan Lie.

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Johan Lie received his Cand. Scient. (M.S.) degree from the University of Bergen in 2003. He is currently pursuing his PhD degree in applied mathematics within the topic of Diffusion Tensor Imaging of the human brain. His main research interest is image processing using partial differential equations and transform based methods.

Jan M. Nordbotten received his Cand. Scient. (M.S.) and Dr. Scient. (Ph.D.) degrees from the University of Bergen in 2002 and 2004, respectively. For his work in his doctorate degree, he was awarded the Lauritz Meltzer award for young scientists. In 2004 and 2005 Nordbotten spent time as a Post. Doc. at Princeton University and the University of Bergen before taking an Associate Professor position in the Department of Mathematics at the University of Bergen in 2006. His main research focus lies in the analysis of partial differential equations arising in the environmental sciences, in particular multi-phase flow in porous media and eco-hydrology.

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Lie, J., Nordbotten, J.M. Inverse Scale Spaces for Nonlinear Regularization. J Math Imaging Vis 27, 41–50 (2007). https://doi.org/10.1007/s10851-006-9694-9

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