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arXiv · 2508.06490

Multivariate Fields of Experts for Convergent Image Reconstruction

Stanislas Ducotterd·Michael Unser
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Abstract

We introduce the multivariate fields of experts, a new framework for the learning of image priors. Our model generalizes existing fields of experts methods by incorporating multivariate potential functions constructed via Moreau envelopes of the $\ell_\infty$-norm. We demonstrate the effectiveness of our proposal across a range of inverse problems that include image denoising, deblurring, compressed-sensing magnetic-resonance imaging, and computed tomography. The proposed approach outperforms comparable univariate models and achieves performance close to that of deep-learning-based regularizers while being significantly faster, requiring fewer parameters, and being trained on substantially fewer data. In addition, our model retains a high level of interpretability due to its structured design. It is supported by theoretical convergence guarantees which ensure reliability in sensitive reconstruction tasks.

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Stanislas Ducotterd, Michael Unser. 2025-08-08. Multivariate Fields of Experts for Convergent Image Reconstruction. https://arxiv.org/abs/2508.06490

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