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| [ Tutorial on 2D wavelets ] [ WITS: Where is the starlet? ] | |
If you cannot find anything more, look for something else (Bridget Fountain) |
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Goto Blog: A fortunate hive |
| Training/Formation: | EUROSAE NOUVELLES METHODES DE TRAITEMENT DES SIGNAUX Ondelettes, temps-fréquence : théorie, pratique et applications
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10 au 13 décembre 2012 | |
| Talk: | Ecole Analyse multirésolution pour l'image 2012 (Hommage à Joseph Fourier) | 20-22 juin 2012 | |
| Talk: | ENSIC, Nancy - Journée Scientifique et Professionnelle organisée par la Société des Experts Chimistes de France (SECF) et le Laboratoire Réactions et Génie des Procédés (LRGP) De la donnée à l’information : Comment accroître la productivité et mieux exploiter les résultats de mesure ?
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31 mai 2012 | |
| Talk: | ENS Lyon, Laboratoire de Physique | 12 avril 2012 | |
| 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 | |
| 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, submitted to Geophysics
(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. The challenge consists in attenuating multiples without distorting primaries, despite the high cross-correlation between their waveform. For this purpose, this complicated wide-band problem is decomposed into a set of more tractable narrow-band problems using a 1D complex wavelet frame. This decomposition enables a single-pass adaptive subtraction via single-sample (unary) complex Wiener filters, consistently estimated on overlapping windows in a complex wavelet transformed domain. Each unary filter compensates amplitude differences within its frequency support, and rectifies more robustly small and large misalignment errors through phase and integer delay corrections . This approach greatly simplifies the matching filter estimation and, despite its simplicity, compares promisingly with standard adaptive 2D methods , on both synthetic and field data. |
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 |
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).
This site contains:
Ce site contient :
| 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 Algorithmes de compression à base d'ondelettes et de bancs de filtres, ou transformées à recouvrementUniversité 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 |
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)
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