Learning from small data sets: Patch‐based regularizers in inverse problems for image reconstruction

M Piening, F Altekrüger, J Hertrich… - GAMM …, 2024 - Wiley Online Library
The solution of inverse problems is of fundamental interest in medical and astronomical
imaging, geophysics as well as engineering and life sciences. Recent advances were made …

Posterior sampling based on gradient flows of the MMD with negative distance kernel

P Hagemann, J Hertrich, F Altekrüger, R Beinert… - arXiv preprint arXiv …, 2023 - arxiv.org
We propose conditional flows of the maximum mean discrepancy (MMD) with the negative
distance kernel for posterior sampling and conditional generative modeling. This MMD …

[图书][B] Generalized normalizing flows via Markov chains

PL Hagemann, J Hertrich, G Steidl - 2023 - cambridge.org
Normalizing flows, diffusion normalizing flows and variational autoencoders are powerful
generative models. This Element provides a unified framework to handle these approaches …

Importance corrected neural JKO sampling

J Hertrich, R Gruhlke - arXiv preprint arXiv:2407.20444, 2024 - arxiv.org
In order to sample from an unnormalized probability density function, we propose to
combine continuous normalizing flows (CNFs) with rejection-resampling steps based on …

Conditional generative models are provably robust: Pointwise guarantees for bayesian inverse problems

F Altekrüger, P Hagemann, G Steidl - arXiv preprint arXiv:2303.15845, 2023 - arxiv.org
Conditional generative models became a very powerful tool to sample from Bayesian
inverse problem posteriors. It is well-known in classical Bayesian literature that posterior …

Robustness and exploration of variational and machine learning approaches to inverse problems: An overview

A Auras, KV Gandikota, H Droege… - GAMM …, 2024 - Wiley Online Library
This paper provides an overview of current approaches for solving inverse problems in
imaging using variational methods and machine learning. A special focus lies on point …

PatchNR: learning from very few images by patch normalizing flow regularization

F Altekrüger, A Denker, P Hagemann, J Hertrich… - Inverse …, 2023 - iopscience.iop.org
Learning neural networks using only few available information is an important ongoing
research topic with tremendous potential for applications. In this paper, we introduce a …

Equivariant bootstrapping for uncertainty quantification in imaging inverse problems

J Tachella, M Pereyra - arXiv preprint arXiv:2310.11838, 2023 - arxiv.org
Scientific imaging problems are often severely ill-posed, and hence have significant intrinsic
uncertainty. Accurately quantifying the uncertainty in the solutions to such problems is …

Semi-unbalanced optimal transport for image restoration and synthesis

S Mignon, B Galerne, M Hidane, C Louchet, J Mille - 2024 - hal.science
In this paper, we build on optimal transport (OT) theory to present a novel asymmetrically
unbalanced variant, the semi-unbalanced optimal transport (SUOT), specifically designed …

Stochastic super-resolution for Gaussian textures

É Pierret, B Galerne - ICASSP 2023-2023 IEEE International …, 2023 - ieeexplore.ieee.org
Super-resolution (SR) is an ill-posed inverse problem which consists in proposing high-
resolution images consistent with a given low-resolution one. While most SR algorithms are …