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Cone Beam Computerized Tomography (CBCT) and Positron Emission Tomography (PET) Scans are medical imaging devices that require solving ill-posed inverse problems. The models considered come directly from the physics of the acquisition devices, and take into account the specificity of the (Poisson) noise. We propose various fast numerical schemes to compute(More)
Let (Xt, t ≥ 0) be an α-stable random walk with values in Z d. Let lt(x) = t 0 δx(Xs)ds be its local time. For p > 1, not necessarily integer, It = x l p t (x) is the so-called p-fold self-intersection local time of the random walk. When p(d − α) < d, we derive precise logarithmic asymptotics of the probability P [It ≥ rt] for all scales rt E [It]. Our(More)
Multifractal analysis has become a standard signal processing tool, for which a promising new formulation, the <inline-formula><tex-math notation="LaTeX">$\boldsymbol {p}$</tex-math></inline-formula>-leader multifractal formalism, has recently been proposed. It relies on novel multiscale quantities, the <inline-formula><tex-math notation="LaTeX">(More)
Bijan Afsari Young Joon Ahn Andrés Almansa Andreas Alpers L. Alvarez Eric Andres Michel Antunes Erchan Aptoula Pablo Arias Ery Arias-Castro Jean-Francois Aujol George Azzopardi Martin Bähr Lu Bai Peter Balazs Coloma Ballester Joao Barreto Thomas Batard Joost Batenburg Étienne Baudrier Amir Beck Alexander Beigl Martin Benning Ronny Bergmann Bejamin Berkels(More)
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