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Bienvenue - Laboratoire Jacques-Louis Lions

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Stages (3eme / seconde)
Stages de découverte (classe de 3eme, 2nde) Voir https://www.math.univ-paris-diderot.fr/diffusion/index

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189 personnes travaillent au LJLL

90 permanents

82 chercheurs et enseignants-chercheurs permanents

8 ingénieurs, techniciens et personnels administratifs

99 personnels non permanents

73 doctorants

14 post-doc et ATER

12 émérites et collaborateurs bénévoles

 

Chiffres mars 2019

 

Séminaire du LJLL - 07 12 2018 14h00 : G. Papanicolaou

George Papanicolaou (Université de Stanford)
Imaging sparse reflectivities from noisy data

Résumé
Algorithms for obtaining high-resolution images often use thresholding, which removes noise and other imperfections in the image efficiently provided that the support of the image is sparse and noise contamination is not too big. However, such imaging methods tend to be unstable since, above a certain level, the noise destroys the image. How can these imaging methods be stabilized ? I will review these issues and then present a method that in some cases can produce clean images even with a lot of noise. Numerical simulations illustrate the effectiveness of this approach.