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Author

Daniel Rueckert

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#machine learning Preprint Sep 2026

Sparse cubical complexes for efficient topology-preservation in image data

Persistent homology (PH) is a frequently used tool for extracting and preserving topological information from image data, particularly in image segmentation, where preservation of topological structures is important. However, despite its general applicability across dimensionality, domains, and target structures, the r...

Alexander H. Berger, Marco Fontana, Daniel Rueckert et al. · 0 citations
#artificial intelligence Preprint Sep 2026

What Makes a Good Medical Image Tokenizer? Rethinking Reconstruction and Generation in Medical Image Tokenization

Latent diffusion models now dominate medical image generation, and every such pipeline rests on a \emph{tokenizer} that compresses images into the latent codes for image generation to operate on. Thereby, the tokenizer choice bounds every downstream task from reconstruction fidelity and generation quality to the repres...

Niklas Bubeck, Yundi Zhang, Vasiliki Sideri-Lampretsa et al. · 0 citations
Aug 2026

It depends: Incorporating correlations for joint aleatoric and epistemic uncertainties of high-dimensional output spaces

This paper proposes a novel approach that approximates the resulting joint uncertainty using a low-rank plus diagonal covariance structure, capturing essential output correlations while avoiding the computational burdens of full covariance matrices.

Leonhard F. Feiner, M. Nickel, M. Menten et al. · 0 citations

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