Abstract
Human visual perception is able to complete contours of objects even if they are disrupted or occluded in images. A possible mathematical imitation of this property is to represent object contours in the higher-dimensional space of positions and directions, the so-called roto-translation space, and to use this representation to promote contours with small curvature and separate overlapping objects. Interpreting image level lines as contours then leads to curvature-penalizing regularization functionals for image processing, which become convex through the additional dimension. We present the basic concept, some of its properties, as well as numerical discretization approaches for those functionals.
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Acknowledgements
This work has been supported by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation), Cells-in-Motion Cluster of Excellence (EXC 1003—CiM), University of Münster, Germany, by Germany’s Excellence Strategy—EXC 2044—, Mathematics Münster: Dynamics—Geometry—Structure, and by the Alfried Krupp Prize for Young University Teachers awarded by the Alfried Krupp von Bohlen und Halbach-Stiftung.
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Böttcher, U., Wirth, B. (2020). Convex Lifting-Type Methods for Curvature Regularization. In: Grohs, P., Holler, M., Weinmann, A. (eds) Handbook of Variational Methods for Nonlinear Geometric Data. Springer, Cham. https://doi.org/10.1007/978-3-030-31351-7_7
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