activity
20182020
collaborators

7 papers

math.NA2020

Multi-Channel Potts-Based Reconstruction for Multi-Spectral Computed Tomography

Lukas Kiefer, Stefania Petra, Martin Storath +1

We consider reconstructing multi-channel images from measurements performed by photon-counting and energy-discriminating detectors in the setting of multi-spectral X-ray computed t…

math.NA2020

Clothoid Fitting and Geometric Hermite Subdivision

Ulrich Reif, Andreas Weinmann

We consider geometric Hermite subdivision for planar curves, i.e., iteratively refining an input polygon with additional tangent or normal vector information sitting in the vertice…

math.NA2019

Non-smooth variational regularization for processing manifold-valued data

Martin Holler, Andreas Weinmann

Many methods for processing scalar and vector valued images, volumes and other data in the context of inverse problems are based on variational formulations. Such formulations requ…

math.NA2018

Iterative Potts minimization for the recovery of signals with discontinuities from indirect measurements -- the multivariate case

Lukas Kiefer, Martin Storath, Andreas Weinmann

Signals and images with discontinuities appear in many problems in such diverse areas as biology, medicine, mechanics, and electrical engineering. The concrete data are often discr…

math.NA2018

Wavelet Sparse Regularization for Manifold-Valued Data

Martin Storath, Andreas Weinmann

In this paper, we consider the sparse regularization of manifold-valued data with respect to an interpolatory wavelet/multiscale transform. We propose and study variational models…

math.NA2018

Smoothing for signals with discontinuities using higher order Mumford-Shah models

Martin Storath, Lukas Kiefer, Andreas Weinmann

Minimizing the Mumford-Shah functional is frequently used for smoothing signals or time series with discontinuities. A significant limitation of the standard Mumford-Shah model is…