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• W2760988117 abstract "This paper addresses the morphing of manifold-valued images based on the time discrete geodesic paths model of Berkels, Effland and Rumpf 2015. Although for our manifold-valued setting such an interpretation of the energy functional is not available so far, the model is interesting on its own. We prove the existence of a minimizing sequence within the set of $L^2(Omega,mathcal{H})$ images having values in a finite dimensional Hadamard manifold $mathcal{H}$ together with a minimizing sequence of admissible diffeomorphisms. To this end, we show that the continuous manifold-valued functions are dense in $L^2(Omega,mathcal{H})$. We propose a space discrete model based on a finite difference approach on staggered grids, where we focus on the linearized elastic potential in the regularizing term. The numerical minimization alternates between i) the computation of a deformation sequence between given images via the parallel solution of certain registration problems for manifold-valued images, and ii) the computation of an image sequence with fixed first (template) and last (reference) frame based on a given sequence of deformations via the solution of a system of equations arising from the corresponding Euler-Lagrange equation. Numerical examples give a proof of the concept of our ideas." @default.
• W2760988117 created "2017-10-20" @default.
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• W2760988117 date "2017-10-06" @default.
• W2760988117 modified "2023-09-27" @default.
• W2760988117 title "Morphing of Manifold-Valued Images inspired by Discrete Geodesics in Image Spaces" @default.
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