Search Results for author: Alexander Bigalke

Found 8 papers, 8 papers with code

DG-TTA: Out-of-domain medical image segmentation through Domain Generalization and Test-Time Adaptation

1 code implementation11 Dec 2023 Christian Weihsbach, Christian N. Kruse, Alexander Bigalke, Mattias P. Heinrich

In this study, we propose to combine domain generalization and test-time adaptation to create a highly effective approach for reusing pre-trained models in unseen target domains.

Domain Generalization Image Registration +6

Shape Matters: Detecting Vertebral Fractures Using Differentiable Point-Based Shape Decoding

1 code implementation8 Dec 2023 Hellena Hempe, Alexander Bigalke, Mattias P. Heinrich

In this study, we specifically explore the use of shape auto-encoders for vertebrae, taking advantage of advancements in automated multi-label segmentation and the availability of large datasets for unsupervised learning.

Decoder Segmentation

Unsupervised 3D registration through optimization-guided cyclical self-training

1 code implementation29 Jun 2023 Alexander Bigalke, Lasse Hansen, Tony C. W. Mok, Mattias P. Heinrich

State-of-the-art deep learning-based registration methods employ three different learning strategies: supervised learning, which requires costly manual annotations, unsupervised learning, which heavily relies on hand-crafted similarity metrics designed by domain experts, or learning from synthetic data, which introduces a domain shift.

Self-Supervised Learning

A denoised Mean Teacher for domain adaptive point cloud registration

1 code implementation26 Jun 2023 Alexander Bigalke, Mattias P. Heinrich

Self-training with the Mean Teacher is an established approach to this problem but is impaired by the inherent noise of the pseudo labels from the teacher.

Computational Efficiency Denoising +2

Chasing Clouds: Differentiable Volumetric Rasterisation of Point Clouds as a Highly Efficient and Accurate Loss for Large-Scale Deformable 3D Registration

1 code implementation ICCV 2023 Mattias P. Heinrich, Alexander Bigalke, Christoph Großbröhmer, Lasse Hansen

Learning-based registration for large-scale 3D point clouds has been shown to improve robustness and accuracy compared to classical methods and can be trained without supervision for locally rigid problems.

Self-Supervised Learning

Anatomy-guided domain adaptation for 3D in-bed human pose estimation

1 code implementation22 Nov 2022 Alexander Bigalke, Lasse Hansen, Jasper Diesel, Carlotta Hennigs, Philipp Rostalski, Mattias P. Heinrich

As a remedy, we present a novel domain adaptation method, adapting a model from a labeled source to a shifted unlabeled target domain.

3D Human Pose Estimation Anatomy +1

Adapting the Mean Teacher for keypoint-based lung registration under geometric domain shifts

1 code implementation1 Jul 2022 Alexander Bigalke, Lasse Hansen, Mattias P. Heinrich

We build on a keypoint-based registration model, combining graph convolutions for geometric feature learning with loopy belief optimization, and propose to reduce the domain shift through self-ensembling.

Domain Adaptation Image Registration +1

Fusing Posture and Position Representations for Point Cloud-Based Hand Gesture Recognition

1 code implementation 3DV 2022 Alexander Bigalke, Mattias P Heinrich

To induce the global and local stream to capture complementary position and posture features, we propose the use of different 3D learning architectures in both streams.

Hand Gesture Recognition Hand-Gesture Recognition +1

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