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Frédéric Champagnat

2 accepted papers

2025

Evaluating the Posterior Sampling Ability of Plug&Play Diffusion Methods in Sparse-View CT

ICASSP 2025accepted

Plug&Play (PnP) diffusion models are state-of-the-art methods in computed tomography (CT) reconstruction. Such methods usually consider applications where the sinogram contains a sufficient amount of information for the posterior distribution to be concentrated around a single mode, and consequently…

Cited by 0SourceScholar
2019

Atom Selection in Continuous Dictionaries: Reconciling Polar and SVD Approximations

ICASSP 2019accepted

This paper deals with efficient atom selection procedure in a continuous dictionary, as required for instance in a Frank-Wolfe approach within a BLASSO problem for the one-dimensional deconvolution problem. We show that efficient maximization of a correlation between any given vector and an atom swe…

Cited by 0SourceScholar