Related papers: UNet-AF: An alias-free UNet for image restoration

UNet-AF: An alias-free UNet for image restoration

URL: http://arxiv.org/abs/2603.11323v1
Date: Wed, 11 Mar 2026 21:34:43 GMT
Title: UNet-AF: An alias-free UNet for image restoration
Abstract summary: UNet is often assumed to be equivariant to translations, yet they traditionally consist of layers that are known to be prone to aliasing.<n>We propose a new alias-free UNet designed from a careful selection of state-of-the-art translation-equivariant layers.
Score: 10.849837462612847
License: http://creativecommons.org/licenses/by/4.0/
Abstract: The simplicity and effectiveness of the UNet architecture makes it ubiquitous in image restoration, image segmentation, and diffusion models. They are often assumed to be equivariant to translations, yet they traditionally consist of layers that are known to be prone to aliasing, which hinders their equivariance in practice. To overcome this limitation, we propose a new alias-free UNet designed from a careful selection of state-of-the-art translation-equivariant layers. We evaluate the proposed equivariant architecture against non-equivariant baselines on image restoration tasks and observe competitive performance with a significant increase in measured equivariance. Through extensive ablation studies, we also demonstrate that each change is crucial for its empirical equivariance. Our implementation is available at https://github.com/jscanvic/UNet-AF

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