Search Results for author: Benedikt Wirth

Found 9 papers, 4 papers with code

Parametrizing Product Shape Manifolds by Composite Networks

1 code implementation28 Feb 2023 Josua Sassen, Klaus Hildebrandt, Martin Rumpf, Benedikt Wirth

Parametrizations of data manifolds in shape spaces can be computed using the rich toolbox of Riemannian geometry.

Efficient Neural Network

Convergent autoencoder approximation of low bending and low distortion manifold embeddings

1 code implementation22 Aug 2022 Juliane Braunsmann, Marko Rajković, Martin Rumpf, Benedikt Wirth

The encoder embeds the input data manifold into a lower-dimensional latent space, while the decoder represents the inverse map, providing a parametrization of the data manifold by the manifold in latent space.

Decoder Dimensionality Reduction

Learning low bending and low distortion manifold embeddings

no code implementations27 Apr 2021 Juliane Braunsmann, Marko Rajković, Martin Rumpf, Benedikt Wirth

The encoder provides an embedding from the input data manifold into a latent space which may then be used for further processing.

Quartic $L^p$-convergence of cubic Riemannian splines

no code implementations15 Dec 2020 Hanne Hardering, Benedikt Wirth

Still, concepts from the linear setting may be generalized to the Riemannian case, where we try to use intrinsic Riemannian formulations and avoid charts as much as possible.

Numerical Analysis Numerical Analysis 65D10, 65D05

Dynamic Cell Imaging in PET with Optimal Transport Regularization

no code implementations20 Feb 2019 Bernhard Schmitzer, Klaus P. Schäfers, Benedikt Wirth

In contrast to conventional PET reconstruction our method combines the information from all detected events not only to reconstruct the dynamic evolution of the radionuclide distribution, but also to improve the reconstruction at each single time point by enforcing temporal consistency.

Cell Tracking Image Reconstruction

A Sinkhorn-Newton method for entropic optimal transport

1 code implementation18 Oct 2017 Christoph Brauer, Christian Clason, Dirk Lorenz, Benedikt Wirth

We further investigate numerically the robustness of the proposed method with respect to parameters such as the mesh size of the discretization.

A Framework for Wasserstein-1-Type Metrics

no code implementations8 Jan 2017 Bernhard Schmitzer, Benedikt Wirth

We propose a unifying framework for generalising the Wasserstein-1 metric to a discrepancy measure between nonnegative measures of different mass.

Computational Efficiency Vocal Bursts Type Prediction

Vector-valued multibang control of differential equations

1 code implementation23 Nov 2016 Christian Clason, Carla Tameling, Benedikt Wirth

We consider a class of (ill-posed) optimal control problems in which a distributed vector-valued control is enforced to pointwise take values in a finite set $\mathcal{M}\subset\mathbb{R}^m$.

Optimization and Control

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