Charles Deledalle's Résumé

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Charles Deledalle picture




Telecom ParisTech
Utrecht University


Telecom ParisTech



Recent publications

Some of the publications below have appeared in an IEEE journal, Springer journal, Elsevier journal or conference record. By allowing you to download them, I am required to post the following copyright reminder: "This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder."

Estimation of Kullback-Leibler losses for noisy recovery problems within the exponential family,
Charles-Alban Deledalle
Electronic Journal of Statistics, vol. 11, no. 2, pp. 3141-3164, 2017 (Project Euclid, HAL, ArXiv)
We address the question of estimating Kullback-Leibler losses rather than squared losses in recovery problems where the noise is distributed within the exponential family. We exhibit conditions under which these losses can be unbiasedly estimated or estimated with a controlled bias. Simulations on parameter selection problems in image denoising applications with Gamma and Poisson noises illustrate the interest of Kullback-Leibler losses and the proposed estimators.
MuLoG, or How to apply Gaussian denoisers to multi-channel SAR speckle reduction?,
Charles-Alban Deledalle, Loïc Denis, Sonia Tabti, Florence Tupin
IEEE Transactions on Image Processing, vol. 26, no. 9, pp. 4389-4403, 2017 (IEEE Xplore, recommended pdf, HAL)
Speckle reduction is a longstanding topic in synthetic aperture radar (SAR) imaging. Since most current and planned SAR imaging satellites operate in polarimetric, interferometric or tomographic modes, SAR images are multi-channel and speckle reduction techniques must jointly process all channels to recover polarimetric and interferometric information. The distinctive nature of SAR signal (complex-valued, corrupted by multiplicative fluctuations) calls for the development of specialized methods for speckle reduction. Image denoising is a very active topic in image processing with a wide variety of approaches and many denoising algorithms available, almost always designed for additive Gaussian noise suppression. This paper proposes a general scheme, called MuLoG (MUlti-channel LOgarithm with Gaussian denoising), to include such Gaussian denoisers within a multi-channel SAR speckle reduction technique. A new family of speckle reduction algorithms can thus be obtained, benefiting from the ongoing progress in Gaussian denoising, and offering several speckle reduction results often displaying method-specific artifacts that can be dismissed by comparison between results.
CLEAR: Covariant LEAst-square Re-fitting with applications to image restoration,
C-A. Deledalle, N. Papadakis, J. Salmon and S. Vaiter
SIAM Journal on Imaging Sciences, vol. 10, no. 1, pp. 243-284, 2017 (epubs SIAM, HAL, ArXiv)
In this paper, we propose a new framework to remove parts of the systematic errors affecting popular restoration algorithms, with a special focus for image processing tasks. Extending ideas that emerged for l1 regularization, we develop an approach that can help re-fitting the results of standard methods towards the input data. Total variation regularizations and non-local means are special cases of interest. We identify important covariant information that should be preserved by the re-fitting method, and emphasize the importance of preserving the Jacobian (w.r.t to the observed signal) of the original estimator. Then, we provide an approach that has a ``twicing'' flavor and allows re-fitting the restored signal by adding back a local affine transformation of the residual term. We illustrate the benefits of our method on numerical simulations for image restoration tasks.

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IEEE GRSS 2016 Transaction Prize Paper Award
for the paper "NL-SAR: a unified Non-Local framework for resolution-preserving (Pol)(In)SAR denoising",
Authors: Charles-Alban Deledalle, Loïc Denis, Florence Tupin, Andreas Reigber and Marc Jäger.
2013 CNRS Award for Scientific Excellence
for my works on "Inference and consideration of complex and varied natural image models for restoration purposes"
2011 PhD award in Signal, Image and Vision. Club EEA / GdR ISIS / GRETSI
for the thesis "Image denoising beyond additive Gaussian noise - Patch-based estimators and their application to SAR imagery"
Best student paper award IEEE ICIP 2010
for the paper "Poisson NL Means: Unsupervised Non Local Means for Poison Noise",
Authors: Charles-Alban Deledalle, Loïc Denis and Florence Tupin.

Seminars, invited speakers and workshops:

Aug. 2014Seminar SCIL, Université de Sherbrooke, CanadaHost: M. Descoteaux
July 2014Summerschool TUM/DLR, Ftan, SwitzerlandHost: R. Bamler
May 2014SIAM Conference on Imaging Science, Hong-KongHost: R. Willet & R. Giryes
April 2014Seminar Cluster CPU/LaBEX COTE, Bordeeaux, FranceHost: A.-L. Bué
March 2014Seminaires Patchs, Telecom ParisTech, FranceHost: A. Almansa
March 2014Journée SIERRA, Saint-Etienne, FranceHost: J. Debayle
Feb. 2014Salon Aquitec - Stand CNRS Parc des expositions de Bordeaux Lac
Jan. 2014Seminar CESBIO, Toulouse, FranceHost: Y. Kerr
Nov. 2013Journées Télédétection PEPS WAVE, Bordeaux, FranceHost: L. Bombrun
Oct. 2013Atelier ForM@ter MDIS, Autrans, FranceHost: M.-P. Doin
Sept. 2013Conférence GRETSI, Session Plénière, Brest, FranceHost: GRETSI
March 2013Groupe de Travail Image, Bordeaux, FranceHost: P. Coupé
Fév. 2013Salon Aquitec - Stand CNRS Parc des expositions de Bordeaux Lac
Fév. 2013Séminaire TSI Télécom ParisTech Hôte : I. Bloch
Déc. 2012GdR ISIS "Modèles de textures" Télécom ParisTech Hôtes : J-F. Aujol & Y. Gousseau
Oct. 2012Journée FRUMAM Univ Aix-Marseilles Hôte : F-X. Dupé & C. Melot
Juil. 2012Workshop ANR NatImages Nice Hôte : J. Bobin
Mars 2012Séminaire LATP Univ. Aix-Marseilles Hôte : F-X. Dupé
Mars 2012Séminaire I3S Univ. Nice Sofia-Antipolis Hôte : L. Blanc-Féraud
Fév. 2012Séminaire LAGIS École Centrale de Lille Hôte : P. Chainais
Fév. 2012Séminaire IMB/LaBRI/IMS Univ. Bordeaux 1 Hôte : C. Dossal
Juin 2011Séminaire GREYC ENSICAEN, Caen Hôte : L. Condat
Mai 2011Congrès SMAI Guidel, Bretagne Hôtes : J. Delon & C. Louchet
Sept. 2010Séminaire Observatoire de Lyon Univ. Lyon 1 Hôte : E. Thiébaut
Mai 2010Séminaire IETR Univ. Rennes 1 Hôte : E. Pottier

Peer reviews

Refereeing of the work of peers as an anonymous reviewer for:
Last modified: Mon Jan 9 22:50:33 Europe/Berlin 2017