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If you cannot find anything more, look for something else (Bridget Fountain)
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news and general information

Conference special session

ICIP 2014: Special session on Image Processing for Materials Characterization with an introductory overview paper on Image Processing for Materials Characterization: Issues, Challenges and Opportunities

Internship

Postdoc (2014): Compression-based Very large data management in Geosciences (gestion des très gros volumes de données en géosciences par compression)

Talks

[Upcoming: INRIA 2014]

Talk: Suppression de réflexions multiples (échos) par filtrage adaptatif dans des trames d'ondelettes : du basique à l'évolué [abstract+slides+paper 1+paper 2], 18 septembre 2014, séminaire Signal Images, université de Bordeaux

Talk: Suppression adaptative de réflexions multiples par filtres de Wiener unaires en trame d'ondelettes complexes [abstract+slides+paper 1+paper 2], 25 mars 2014, SIERRA 2014 (presenter's slides), Signal et Images en Région Rhône-Alpes, Saint-Étienne

Talk: Filtrage adaptatif dans des trames d'ondelettes, application à la suppression d'échos en sismique [abstract+slides+paper 1+paper 2], 18 mars 2014, Université Paris-Nord, journée du pôle Math-STIC, journée images et signaux

Talk: Petite histoire en images des transformées multi-échelle et en ondelettes en deux-dimensions [abstract+slides+paper], Thursday 09 January, 2014, GIPSA-Lab, Grenoble séminaire du département Images et Signal, France

Papers, preprints, events, conferences, special sessions

Euclid in a Taxicab: Sparse Blind Deconvolution with Smoothed l_1/l_2 Regularization (or SOOT, for Smoothed One-Over-Two norm ratio), Audrey Repetti, Mai Quyen-Pham, Laurent Duval, Émilie Chouzenoux, Jean-Christophe Pesquet [page+arxiv+hal+blog+Nuit Blanche]

Conference paper: A constrained-based optimization approach for seismic data recovery problems, Mai Quyen Pham, Caroline Chaux, Laurent Duval, Jean-Christophe Pesquet, Special session on "SS5 - Seismic Signal Processing", International Conference on Acoustics, Speech and Signal Processing (ICASSP), 2014, Florence, Italy [blog+arxiv+paper+slides]

Conference paper [link]: Context-based polynomial extrapolation and slackened synchronization for fast multi-core simulation using FMI, Abir Ben Khaled, Laurent Duval, Mongi Ben Gaïd, Daniel Simon, Modelica 2014, Lund, Sweden

Paper: Experimental hydrodynamic study of valve trays, Rim Brahem and A. Royon-Lebeaud and D. Legendre and Maxime Moreaud and Laurent Duval, Chemical Engineering Science, Volume 100, 30 August 2013, Pages 23–32

Paper: A Primal-Dual Proximal Algorithm for Sparse Template-Based Adaptive Filtering: Application to Seismic Multiple Removal, Mai-Quyen Pham, Laurent Duval, Caroline Chaux, Jean-Christophe Pesquet, IEEE Transactions on Signal Processing, 2014 [page+arxiv+hal+doi+blog+pdf]

Final call for papers: Special issue on Advances in signal processing and image analysis for physicochemical, analytical chemistry and chemical sensing (pdf)

Conference (special session): Signal processing for chemical sensing (@ ICASSP 2013), with Christian Jutten and Leonardo Tomazelli Duarte

Paper: Adaptive multiple subtraction with wavelet-based complex unary Wiener filters, Geophysics, Nov.-Dec. 2012 [local PDF][arxiv (color version)][html][Geophysics PDF][Geophysics PDF plus][GeoScienceWorld]

Paper: Unary adaptive subtraction of joint multiple models with complex wavelet frames, Proc. SEG 2012, Las Vegas [html]

Lectures (continuing education)

Lecture: Nouvelles méthodes de traitement des signaux MTS015 Ondelettes, temps-fréquence : théorie, pratique et applications (EUROSAE, décembre 2014)

Lecture: Traitement numérique des images ML11 (Supélec, 6-10 octobre 2014) [filtrage, attributs, contours, et segmentation d'images, compression, ondelettes]

Goto Blog: A fortunate hive snapshot below

Newest News

Paper: A Convex Variational Approach for Multiple Removal in Seismic Data (EUSIPCO 2012)

Special issue: Advances in Multirate Filter Bank Structures and Multiscale Representations: Signal Processing, Volume 91, Issue 12, Dec. 2011

Training/Formation: EUROSAE Nouvelles méthodes de traitement des signaux, Ondelettes, temps-fréquence : théorie, pratique et applications ((pdf))
  • Rappels de filtrage et d'analyse de Fourier
  • Analyses temps-fréquence, temps-échelle
  • Bases d'ondelettes discrètes
  • Ondelettes multidimensionnelles
  • Extensions des décompositions en ondelettes
  • Méthodes pour l’estimation statistique
  • Pratique
  • Applications
10 au 13 décembre 2012
Paper: Adaptive multiple subtraction with wavelet-based complex unary Wiener filters, Sergi Ventosa, Sylvain Le Roy, Irene Huard, Antonio Pica, Hérald Rabeson, Patrice Ricarte, Laurent Duval, Geophysics, volume 77, number 6 (more information)
Adaptive subtraction is a key element in predictive multiple-suppression methods. It minimizes misalignments and amplitude differences between modeled and actual multiples, and thus reduces multiple contamination in the dataset after subtraction. Due to the high cross-correlation between their waveform, the main challenge resides in attenuating multiples without distorting primaries. As they overlap on a wide frequency range, we split this wide-band problem into a set of more tractable narrow-band filter designs, using a 1D complex wavelet frame. This decomposition enables a single-pass adaptive subtraction via complex, single-sample (unary) Wiener filters, consistently estimated on overlapping windows in a complex wavelet transformed domain. Each unary filter compensates amplitude differences within its frequency support, and can correct small and large misalignment errors through phase and integer delay corrections. This approach greatly simplifies the matching filter estimation and, despite its simplicity, narrows the gap between 1D and standard adaptive 2D methods on field data.
Jun. 2012
Talk: Club EEA, Ecole Analyse multirésolution pour l'image 2012 (Hommage à Joseph Fourier), Auxerre 20-22 juin 2012
Talk: ENS Lyon, Laboratoire de Physique 12 avril 2012

Contact / Contact informations

Laurent Duval as avatars on the internet (Google profile). But not this ufo-guy, nor this muscle-guy
E-mail: "lcd [ad] ieee [dod] org", or "laurent [dod] duval [ad] gmail [dod] com" (note for the human reader: "siva [ad] conference [dod] con" would read siva@conference.con).

Google Profile : a collection of different avatars
.tel profile : a collection of different addresses
Blog: La vertu d'un la - the virtue of an A, a fortunate hive (bits of science, signal and image processing, and anagrams)
Blog: Information CLADe, regroupement phylogénétique autour de l'intelligence économique et des signaux faibles
Twitter: laurentduval account for scientific stuff
Twitter: Info_CLADe account for competitive intelligence relative stuff
Paper collections and research activities:
ResearchGate - PublicationsList - ResearcherID - Academia.edu - Arxiv (rss) - Mendeley - DBLP - ACM - Google Scolar
Mathematics Genealogy Project (from T. Q. Nguyen to Klein, Lipschitz, Dirichlet, Poisson and Fourier)
Google profile (Google plus) - Linked In - Quora - Viadeo - Blog - Twitter

Oldest News

Paper: Unary adaptive subtraction of joint multiple models with complex wavelet frames, Sergi Ventosa, Sylvain Le Roy, Irene Huard, Antonio Pica, Hérald Rabeson, Laurent Duval, submitted to SEG Annual Meeting
Multiple attenuation is one of the greatest challenges in seismic processing. Due to the high cross-correlation between primaries and multiples, attenuating the latter without distorting the former is a complicated problem. We propose here a joint multiple model-based adaptive subtraction, using single-sample unary filters’ estimation in a complex wavelet transformed domain. The method offers more robustness to incoherent noise through redundant decomposition. It is first tested on synthetic data, then applied on real-field data, with a single-model adaptation and a combination of several multiple models.
Apr. 2012
Link: Signal and image processing SIVA conferences agenda and workshops time-table linked by AFRIF (Association Française pour la Reconnaissance et l'Interprétation des Formes) AFRIF : Annuaire des conférences et revues en lien avec la Reconnaissance de Formes Décembre 2011
Position (FILLED): PhD position/scholarship, 2011-2014: Sparse representations for seismic wave fields restoration and quantitative analysis; Sujet de thèse, 2011-2014: Représentations parcimonieuses pour la restauration et l'analyse quantitative de champs d'ondes en sismique --- Annoucements at Wavelet Digest, GdR ISIS and Nuit Blanche (former version) Aug. 2011
Paper: Coherent Noise Removal In Seismic Data With Redundant Multiscale Directional Filters, Sergi Ventosa, Hérald Rabeson, Laurent Duval, EUSIPCO 2011 (full resolution figures) Aug. 2011
Journal: Access to all accepted papers for Special issue on Advances in Multirate Filter Bank Structures and Multiscale Representations (also at Signal Processing, Volume 91, Issue 12, December 2011, or blog entry Sparse is compact and in press (special issue)) May 2011
Paper: Updated version of a two-dimensional wavelet tutorial/review paper A panorama on Multiscale Geometric Representations and bibtex and html reference made available: (see Addendum to: A panorama on Multiscale Geometric Representations for more details, [arxiv] or [HAL]), Laurent Jacques, Laurent Duval, Caroline Chaux, Gabriel Peyré, Signal Processing December 2011
Talk: Talking about Wiener filters (with complex wavelets) in Wien, about adaptive multiple filtering: Complex wavelet adaptive multiple subtraction with unary filters (preprint), Sergi Ventosa, Hérald Rabeson, Patrice Ricarte, Laurent Duval, EAGE 2011 May 2011
Talk: Représentations bidimensionnelles, géométriques et multi-échelles : panorama, Laurent Jacques, Laurent Duval, Caroline Chaux, Gabriel Peyré, GdR ISIS, Transformées multirésolution géométriques. PDF slides and other presentations in directory http://www-syscom.univ-mlv.fr/~chaux/gdr_ISIS/. See also: A panorama on Multiscale Geometric Representations, intertwining spatial, directional and frequency selectivity April 2011
Paper: Complex wavelet adaptive multiple subtraction with unary filters, Sergi Ventosa, Hérald Rabeson, Patrice Ricarte, Laurent Duval, EAGE 2011 May 2011
Paper: A 2-D wavelet tutorial/review paper: A panorama on Multiscale Geometric Representations, intertwining spatial, directional and frequency selectivity (see Addendum to: A panorama on Multiscale Geometric Representations, intertwining spatial, directional and frequency selectivity for more details, [arxiv]), Laurent Jacques, Laurent Duval, Caroline Chaux, Gabriel Peyré, Signal Processing, special issue on multirate and multiscale, December 2011, published March 2011
Internship:Séparation de mélanges de signaux sous contraintes de positivité et d'additivité (pdf) Sept. 2010
Paper: Short-term spectral analysis and synthesis improvements with oversampled inverse filter banks (related to inverse STFT or iSTFT, see inverse oversampled filter banks optimization codes for more details)
Jérome Gauthier, Laurent Duval, SPIE Optics and Photonics – Wavelets XII, San Diego, 26-29 August 2007. (Wavelets XII)
Jul. 2010
Lecture: EUROSAE Formation continue ; NOUVELLES METHODES DE TRAITEMENT DES SIGNAUX : Ondelettes, temps-fréquence : théorie, pratique et applications (MTS 015, ex ELS 043); Paris, France13-16 Dec. 2010
Lecture: Supélec Formation continue ; Traitement numérique des images (LM11); Metz, France11-15 Oct. 2010
Chapter: Wavelet transform for the denoising of multivariate images (download) in Multivariate Image ProcessingJan. 2010
Matlab code: Multivariate M-band Dual Tree Wavelet Denoising (based on Stein's principle)Dec 2009
Post-doc: Post-doctoral position: Multiscale/Multirate Image Processing with Applications in the Geosciences. Featured and detailed at Wavelet Digest, GdR ISIS and Nuit Blanche
Paper: Optimization of Synthesis Oversampled Complex Filter Banks (download), DOI:10.1109/TSP.2009.2023947, October 2009, IEEE Transactions on Signal Processing, with Matlab codes for inverse overlapped complex filter banks optimization and coefficient or sample-domain SURE (Stein-Unbiased Risk Extimation) denoising. Also available at HAL or Scientificcommons (bibtex). Jul 2009
Conference: SPIE Wavelet Applications in Industrial Processing VII
DL: 22/06/2009 San Diego, California, USA
17-21 January 2010
Lecture: Ecole superieure d'electricite (Supelec), formation continue Traitement numérique des images (LG11)
Gif-sur-Yvette, France
5-9 octobre 2009
Matlab code: M-band dual tree wavelet Matlab toolbox, news on Wavelet DigestFeb 2009
Paper: Directional image processing using wavelet pairs, SPIE Newsroom, Electronic Imaging & Signal ProcessingOct. 2008
Paper: A Nonlinear Stein Based Estimator for Multichannel Image Denoising (download), IEEE Trans. Signal Processing, Aug. 2008
PhD Thesis: J. Gauthier, Analyse de signaux et d’images par bancs de filtres. Applications aux géosciences (on oversampled filter banks with geoscience applications)June 2008

Contenu / Contents

This site contains:

Ce site contient :

Centres d'intérêts / Research interests

Traitement du signal et de l'image / Signal and Image processing
Ondelettes, transformées étendues, bancs de filtres / Wavelets, lapped transforms (GenLOT, GBLT) and multirate filter banks
Ondelettes et bancs de filtres suréchantillonnés, directionnels, en arbre dual / Directional, dual-tree and oversampled filter banks and wavelets
Compression de signaux et d'images / Signal and image compression
Filtrage, débruitage, détection / Filtering, denoising, detection
Applications en chimie / Applications to chemistry
Applications en géosciences (géophysique, géologie) / Applications to geosciences (geophysics, geology)
Applications à l'analyse de combustion des moteurs à fin de contrôle et diagnostics / Applications to engine combustion analysis for control and diagnosis
Traitement du signal temps-réel et robuste / Real-time and robust signal processing

Position (since 2000)

Ingénieur de recherche - Traitement du signal et des images / Research engineer - Signal and Image processing
Chef de projet en traitement de signal et d'images / Project leader in Signal and Image Processing

Activités de formation, enseignement, cours / Lectures, courses, training

Formation / Education

2000 Thèse de doctorat en traitement du signal
PhD degree in Electrical and Computer Engineering (ECE)
Compression de données sismiques : bancs de filtres et transformées étendues, synthèse et adaptation
Seismic data compression: filter banks and lapped transforms, synthesis and adaptation
Algorithmes de compression à base d'ondelettes et de bancs de filtres, ou transformées à recouvrement
Progressive compression algorithms with wavelets and lapped transforms
Université Paris-Sud, Orsay
1998 Assistant de recherche / Research assistant, Boston University, ECE Department, MA, USA (4 mois/4 months)
1996 Diplôme d'ingénieur, option traitement du signal / Master's degree in Electrical and Computer Engineering, 1996, Supélec
1996 DEA de mathématiques pures et appliquées / Pre-doctoral studies in pure and applied Mathematics, Université de Metz
Analyse spectrale, équations aux dérivées partielles, approximations diophantiennes
Spectral analysis, partial differential equations, diophantine approximations

Activités diverses / Miscellaneous activities

Membre / Member Institute of Electrical and Electronics Engineers (IEEE)
Membre / Member European Association of Geophysicists and Engineers (EAGE)

Chairman:
2005 SIAM Conference on Mathematical and Computational Issues in the Geosciences: mini-symposium on wavelets in geosciences, Thursday, June 9, 2005, Avignon, France (full program)
2006 “Wavelet Applications in Industrial Processing IV”, on SPIE Symposium Optics East

Program committee:
2008 Eusipco 2008

Program committee:
International Conference on Computer Vision Theory and Applications (VISAPP 2006 and VISAPP 2007)

Occasional reviewer for / Relecteur pour

Projets parallèles / Side projects

All of the above is related to my present employer (IFP New Energy). Parts of my other life-time activities are more akin to its homonym IFP.org (Independent Feature Project). Isn't it funny? And now for something completely different: a section on short films information (in french). Collaborative outcomes with Oslo Films (script writing).

And now for something completely different: La vertu d'un la, light blog about numbers and letters

Ce qui précède a trait à mon employeur actuel (IFP Energies nouvelles). Une autre part de mes activités a plus à voir avec l'organisme homonyme appelé IFP.org (Independent Feature Project). Étonnant, non ? Une première bribe : une section portant sur l'actualité du court-métrage. Collabore à Oslo Films (écriture de scénarios).

http://www.laurent-duval.eu