Applied Mathematics and Signal Processing Postdoctoral Researcher F.R.S.-FNRS Scientific Research Worker Institute of Information and Communication Technologies, Electronics and Applied Mathematics (ICTEAM), ELEN Department Former researcher at the LTS2 Laboratory, EPFL, (2007-2009) Funded by the Belgian National Science Foundation - FRS-FNRS Formerly funded by the Belgian Science Policy (Return Grant, BELSPO) <myfirstname>.<mylastname>@uclouvain.be +32 10 47 81 24 (fax: +32 10 47 20 89) Office A.133 (1st floor) UCL/SST/ICTM/ELEN, Stévin, Place du Levant 2, PO box L5.04.04 B1348 Louvain-la-Neuve

Well, here is "yet another" scientific homepage ;-)
I collect in these pages data and recent news about my research, my interests, ...
These are also the result of collaborative works with other researchers in Europe, USA, ...
Feel free to discover these topics by browsing the menu here on the left, or on on Google Scholar.

Main fields of interest:

• Compressed Sensing: theory, quantization, robustness and sensors.
• Inverse problems solving by promoting a sparse signal models.
• Applied mathematics for Optics (Deflectometry), Astronomy (Radio-Interferometry) and biomedical applications (X-Ray Imaging).
• Random projections (seen as dimensionality reduction tool) and cryptographic applications.
• Theoretical questions linked to new design of sensors (e.g., cameras, optical sensors, tomography).
• Representation of data on "non-conventional" spaces (e.g., sphere, manifolds, or graphs).

PhD-Students and Postdoc (in link with these fields)

(advisor, coadvisor or collaborator on a day-to-day basis)

• Adriana Gonzalez Gonzalez (PhD-student)
• Jérome Plumat (PhD-student)
• Maxime Taquet (PhD-student)
• Saloomeh Shariati (PhD-student)
• Alexandre Saint (DETROIT project)
• Prasad Sudhakar (Postdoc, DETROIT project)

News

• May 10th, 2012: Presentation at iTWIST2012 on "Compressed Sensing and Quantization: a Compander Approach". Joint work with D. Hammond (U. Oregon, USA) and J. Fadili (GREYC, Caen, France).
• May 9th, 2012: Presentation of Adriana Gonzalez (ELEN/ICTEAM, UCL) at iTWIST2012 on "TV−L2 Refractive Index Map Reconstruction from Polar Domain Deflectometry". Joint work with myself, C. De Vleeschouwer (ELEN/ICTEAM, UCL) and P. Antoine (NAPS/IMCN, UCL).
• May 9-11, 2012: Co-organizing the 1st iTWIST Workshop on "international - Traveling Workshop for Interacting Sparse models and Technology" in CIRM, Marseilles, France. (program available here).
• March 28-30, 2012: Inviting Prof. Jalal Fadili (ENSICaen, France) for a doctoral lecture on "Exploring inverse problems with non-smooth optimization and sparse representations" in the MUSICS doctoral school program.
• March 22, 2012: Invited by P. Chainais and P. Bas to give a talk on "What can we learn from the Compressed Sensing theory?" in LAGIS, Ecole Centrale de Lille, France.
• February 6-8, 2012: Invited as Master Project expert at EPFL by Pr P. Frossard for two works on "Geometric group sparsity in image analysis" by A. Fawzi and "Efficient Depth Based Image Rendering for Virtual Views Synthesis" by G. Chevtchenko. New presentation of "Robust 1-Bit Compressive Sensing: How the Sign of Random Projections Distinguishes Sparse Vectors".
• January 31, 2012: the paper "The PANOPTIC Camera: A Plenoptic Sensor with Real-Time Omnidirectional Capability" by H. Afshari, L. Jacques, L. Bagnato, A. Schmid, P. Vandergheynst and Y. Leblebici, has been accepted in the Journal of Signal Processing Systems.
• January 16-18, 2012: Attending the MIA'12 - Mathematics and Image Analysis 2012.
• December 21, 2011: New presentation of "Robust 1-Bit Compressive Sensing: How the Sign of Random Projections Distinguishes Sparse Vectors" (Joint work with J. Laska, P. Boufounos, R. Baraniuk), at the FNRS Contact Group "Wavelet and applications" at ULB (Brussels, Belgium).
• November 27, 2011: Creation of a "1-bit Compressed Sensing Resource Page" at Rice (by my collaborators J. Laska, P. Boufounos and R. Baraniuk).
• November 16, 2011: Invited presentation on "Robust 1-Bit Compressive Sensing: How the Sign of Random Projections Distinguishes Sparse Vectors" (Joint work with J. Laska, P. Boufounos, R. Baraniuk), at the Signal processing - machine learning seminars organized by the LATP and the Qarma team at LIF.
• November 15-18, 2011: Visiting the Université Aix-Marseille 2 (ESIL/France) and the Signal and Image Processing Group at LATP (Université de Provence, France). Collaboration on Polychromatic CBCT with Y. Boursier (ESIL), P. Vandergheynst (EPFL), Y. Wiaux (EPFL) and P. Frossard (EPFL).
• October 18, 2011: Invited presentation on "Robust 1-Bit Compressive Sensing: How the Sign of Random Projections Distinguishes Sparse Vectors", at the Cesame Seminars in Systems and Control, UCL. Joint work with J. Laska, P. Boufounos, R. Baraniuk.
• September 11-14: Being Plenary Chair with Ann Dooms (VUB/ETRO) at IEEE ICIP11 (invited plenaries). One talk on "Weighted Fidelity in Non-Uniformly Quantized Compressed Sensing" (with D. Hammond, J. Fadili), participation to another "Compact Rotation Invariant Image Descriptors By Spectral Trimming" by M. Taquet (with B. Macq and S. Jaume).
• August 20-26: Attending "Wavelets and Sparsity XIV" (SPIE Optical Engineering and Applications, 21-25 August 2011, San Diego, CA, USA) with one presentation on "Refractive Index Map Reconstruction in Optical Deflectometry Using Total-Variation Regularization" (collaborative work with A. Gonzalez, E. Foumouo and P. Antoine).
• June 27-30, 2011: Attending "Workshop : Signal Processing with Adaptive Sparse Structured Representations" (SPARS11) (Edinburgh, UK) with one talk and one poster (with A. Gonzalez, D. Hammond, J. Fadili, see below).
• May 31, 2011: Participation at the 1st ICTEAM Young Researchers' Day. 10' presentation on "The sparsity paradigm in high dimensional signal representation".
• May 18th, 2011: Invitation of Prof. Y. Boursier (Université Aix-Marseille 2 / ESIL) in the group, Signal Processing Seminar on "Imaging techniques for LOW-DOSE and COLOR tomography: new challenges for Cone-Beam CT and PET with hybrid pixels".
• May 6th, 2011: 2 preprints added to publication list: "Weighted Fidelity in Non-Uniformly Quantized Compressed Sensing" by L. Jacques, D. Hammond, J. Fadili (preprint, ICIP11), and "Compact Rotation Invariant Image Descriptors By Spectral Trimming" by M. Taquet, L. Jacques, B. Macq and S. Jaume (preprint, ICIP11).
• April 22, 2011: paper "A Panorama on Multiscale Geometric Representations, Intertwining Spatial, Directional and Frequency Selectivity" (arxiv preprint) co-written with L. Duval, C. Chaux and G. Peyré, Accepted in Elsevier Signal Processing, Special issue on Advances in Multirate Filter Bank Structures and Multiscale Representations.
• April 22, 2011: Small Matlab demo for the Binary Iterative Hard Thresholding (BIHT), available here and here.
• April 20, 2011: two extended abstracts accepted in SPARS11 (June 27-30 2011, Edinburgh, Scotland, UK):
  • "Primal-Dual TV Reconstruction in Refractive Deflectometry", by A. Gonzalez, L. Jacques, E. Foumouo and P. Antoine (pdf)
  • "Weighted Lp Constraints in Noisy Compressed Sensing", L. Jacques, D. K. Hammond, J. Fadili (pdf)
• April 19, 2011: conference paper "Refractive index map reconstruction in optical deflectometry using total-variation regularization" by L. Jacques, A. Gonzalez, E. Foumouo and P. Antoine, accepted in "Wavelets and Sparsity XIV", SPIE Optical Engineering and Applications, 21-25 August 2011, San Diego, CA, USA.
• April 18, 2011: two conference papers accepted in IEEE ICIP 2011 (11-14 Sept. 2011, Brussels, Belgium; preprints available soon...):
  • "Weighted Fidelity in Non-Uniformly Quantized Compressed Sensing" cowritten with D. Hammond and J. Fadili;
  • "Compact Rotation Invariant Image Descriptors By Spectral Trimming" by M. Taquet, L. Jacques, B. Macq and S. Jaume.
• April 15, 2011: paper "Robust 1-Bit Compressive Sensing via Binary Stable Embeddings of Sparse Vectors" co-written with J. N. Laska, P. T. Boufounos, R. G. Baraniuk submitted (abstract and preprint).
• March 21, 2011: Organization of a MUSICS doctoral school in UCL.
  Invitation of Prof. Gabriel Peyré (Cérémade, Univ. Paris-Dauphine, Paris) for two courses on:
  "Adaptive Geometric Representations" and "Adaptive Patch-based Representations".
• February 28th, 2011: Conference paper accepted in 3DTV (Antalya, Turkey, 2011) (see here).
• February 2011: (deadline extended) for the two new positions opened (1 PhD & 1 Postdoc) funded by the Project DETROIT (Région Wallonne), about inverse problems in 3-D deflectometry using sparse models. In collaboration with Prof. Philippe Antoine (IMCN/NAPS).
• January 21st, 2011: 3 papers submitted to IEEE ICIP2011, Brussels, Belgium (see here).
• December 17th, 2010: Project "New Technologies for Compressive Imaging in X-Ray Computed Tomography", previously submitted to the "Tournesol 2011" call in collaboration with Yannick Boursier (CPPM, Université Aix-Marseille 2 / ESIL, France), accepted by the WBI!
• December 1st, 2010: Pierre Vandergheynst and his team (LTS2, EPFL, Switzerland) have realized this very nice video (and here for a text description) about the Panoptic camera (project in which I'm involved).
• November 23, 2010: Presentation at the Image Processing and Interpretation Group (TELIN, Universiteit Gent, Ghent, Belgium), invited by Prof. Aleksandra Pizurica and Dr Hiêp Quang Luon, about "Compressed Sensing: A Short Introduction and Some Quantization Aspects".
• November 10-12, 2010: Attending CTIC2010.
• October 13th, 2010: Paper "Invariant Spectral Hashing of Image Saliency Graph" accepted in CTIC2010 (see below or here).
• October, 2010: Two new positions opened (1 PhD & 1 Postdoc) funded by the Project DETROIT (Région Wallonne), about inverse problems in 3-D deflectometry using sparse models. In collaboration with Prof. Philippe Antoine (IMCN/NAPS).
• September 26-29, 2010: IEEE ICIP 2010, Hong Kong. Presentation of research on "Randomly Driven Fuzzy Key Extraction of Unclonable Images" (see below)
• September 15th, 2010: Submission of a work on "Invariant Spectral Hashing of Image Saliency Graph" co-written with Maxime Taquet, Christophe De Vleeschouwer and Benoît Macq, to the the 3rd International Workshop on Computational Topology in Image Context (CTIC2010)
• August 16-19, 2010: Visiting the LTS2 Lab in EPFL.
• May 26, 2010: Paper "Dequantizing Compressed Sensing: When Oversampling and Non-Gaussian Constraints Combine" co-written with David Hammond, and Jalal Fadili, accepted for publication in IEEE Trans. Inf. Th.
• May 26, 2010: Paper "Randomly Driven Fuzzy Key Extraction of Unclonable Images" by Saloomeh Shariati, Laurent Jacques, Francois-Xavier Standaert, Benoit Macq, Mohamed Amin Salhi and Philippe Antoine, accepted in IEEE ICIP 2010, Hong Kong.
• May 11, 2010: Presentation at the Cesame Seminars (UCL) on "Dequantizing Compressed Sensing: When Oversampling and Non-Gaussian Constraints Combine".
• May 6-7, 2010: Organization of a MUSICS doctoral school on "Sparse Representation of Signals: Theory, Algorithms and Applications", with the invitation of Prof. Pierre Vandergheynst (EPFL, Switzerland). More information here. I gave also a talk on "Sparsity Driven Computer Vision: Plenoptic and Compressed Imaging" on that occasion.
• April, 2010: Three student projects proposed (in French) with C. De Vleeschouwer for 2010-2011. Main topics: Affine Invariant Image Hashing Methods, Numerical Reconstruction in Optics, Image Deconvolution for Confocal Microscopy.
• April 23, 2010: Paper "A Short Note on Compressed Sensing with Partially Known Signal Support" accepted for publication in Signal Processing - Elsevier.
• April 23, 2010: Invited presentation on Compressed Sensing given at ISBA, UCL.
• April 8, 2010: Presentation entitled "Dequantizing Non-Uniformly Quantized Compressed Sensing: Weight and See!" given at the "Sparsity and Modern Mathematical Methods for High Dimensional Data", VUB, Brussels, April 6-10, 2010. Joint work with David Hammond and Jalal Fadili.
• March 15, 2010: Invitation of Prof. Ingrid Daubechies (Princeton/USA) in UCL. On the occasion of her Intl' Francqui Chair, she gave us a very interesting talk on "Independent component analysis and functional Magnetic Resonance Imaging" (abstract and video available here).
• February 5, 2010: New paper submitted to ICIP 2010, Hong Kong: "Randomly Driven Fuzzy Key Extraction of Unclonable Images", by Saloomeh Shariati, Laurent Jacques, Francois-Xavier Standaert, Benoit Macq, Mohamed Amin Salhi and Philippe Antoine.
• January 6, 2010: New paper submitted to IEEE Transactions on Medical Imaging: "Registration of Images with Variable Contrast Enhancement using Diffeomorphic Morphons", by G. Janssens, L. Jacques, J. Orban de Xivry, X. Geets and B. Macq.
• December 14-16, 2009: Attending the MIA Conference at IHP, Paris, France.
• December 7, 2009: Paper "Dequantizing Compressed Sensing: When Oversampling and Non-Gaussian Constraints Combine." by L. Jacques, D. K. Hammond, and M. J. Fadili, submitted to IEEE Transactions on Information Theory.
• December 3, 2009: Invited at the conference "Ondelettes et Sciences du Vivant" organized by C. Charles, and the Belgian NSF (FNRS) Wavelet Contact Group. Lecture about "Image Denoising using Non-Local Wavelet Bases".
• November 27,2009: Invited at SequeL, INRIA Lille-Nord Europe, in Rémi Munos Machine Learning group, for a presentation at the SequeL Group Meeting about "A Compressed Introduction to Compressed Sensing: Combining Sparsity and Sampling" (pdf).
• November 17,2009: Presentation at Machine Learning Group (MLG/UCL) about "A Compressed Introduction to Compressed Sensing: Combining Sparsity and Sampling" (pdf).
• November 9, 2009: Presentation on "Dequantizing Compressed Sensing with Non-Gaussian Constraints", in collaboration with D. K. Hammond and M. J. Fadili, made at ICIP'09, Cairo, Egypt (presentation in pdf).
• October 20, 2009: In collaboration with Vahid Majidzadeh, Hossein Afshari, Alexandre Schmid, Yusuf Leblebici (from LSM/EPFL) and Pierre Vandergheynst (from LTS2/EPFL), two papers have just been submitted to ISCAS 2010. One paper is about the CMOS Compressive Imager, and the other about the Panoptic camera. (more ...)
• September 14, 2009: Short presentation of Compressed Sensing at the Mondays of Signal Processing in the TELE laboratory.
• September 1st, 2009: The ICDSC Challenge Prize is awarded to "Sport Players Detection and Tracking With a Mixed Network of Planar and Omnidirectional Cameras" by A. Alahi, Y. Boursier, L. Jacques and P. Vandergheynst.
• August 5, 2009: Submission of a tiny technical report on arXiv: "A Short Note on Compressed Sensing with Partially Known Signal Support". If there are errors, I will be happy to get your feedback.
• August 3, 2009: Back to work in TELE/UCL!
• July 29, 2009: Paper "Dequantizing Compressed Sensing with Non-Gaussian Constraints", co-written with D. K. Hammond and M. J. Fadili, (slightly) updated in function of ICIP'09 reviewers comments. Thank you to them.
• July 8, 2009: Official release of the Basis Pursuit De Quantization (BPDQ) toolbox by D. Hammond, M.J. Fadili and I.
• June 30, 2009: Two papers accepted to ICIP'09:
  • "Dequantizing Compressed Sensing with Non-Gaussian Constraints" by L. Jacques, D. K. Hammond, and M. J. Fadili (pdf);
  • "TV-Regularized Generation of Planar Images from Omnicams" by Y. Boursier, L. Jacques, D. Raboud, P. Frossard, M.J. Fadili, P. Vandergheynst (pdf);
• June 9, 2009: M. J. Fadili has presented our common work with D. K. Hammond on Compressed Sensing and Dequantization, at the "Approximation and Optimization in Image Restoration and Reconstruction" workshop in Porquerolles, France.
• April 23, 2009: Poster (pdf) presentation at ICASSP'09 of the work about CMOS Compressed Imaging by Random Convolution, by L. Jacques, P. Vandergheynst, A. Bibet, V. Majidzadeh, A. Schmid, and Y. Leblebici.
• April 2009: Paper "A Sparsity Constrained Inverse Problem to Locate People in a Network of Cameras" by A. Alahi, Y. Boursier, L. Jacques, P. Vandergheynst accepted to DSP 2009.
• February 2009: Paper "Compressed sensing imaging techniques for radio interferometry" by Y. Wiaux et al. accepted for publication in Monthly Notices of the Royal Astronomical Society
• February 14, 2009: Paper "TV-Regularized Generation of Planar Images from Omnicams", by Y. Boursier, L. Jacques, D. Raboud, P. Frossard, M.J. Fadili, P. Vandergheynst. (preprint)
• February 13, 2009: Paper "Dequantizing Compressed Sensing with Non-Gaussian Constraints" (preprint) by L. Jacques, D. K. Hammond, and M. J. Fadili, submitted to ICIP'09 Cairo, Egypt. See also the companion Technical Report: "Dequantizing Compressed Sensing: When Oversampling and Non-Gaussian Constraints Combine." by L. Jacques, D. K. Hammond, and M. J. Fadili. (more on Publications).
• December 31, 2008: Paper "Compressed sensing imaging techniques for radio interferometry" by Y. Wiaux et al. submitted to Monthly Notices of the Royal Astronomical Society. A poster (PDF) on the same subject has been presented at "Workshop on Sparsity and its application to large inverse problems" (Cambridge University, Cambridge UK).
• December 15, 2008: The two ICASSP'09 papers listed below have been accepted.
• December 14-15, 2008: Attending the "Workshop on Sparsity and its application to large inverse problems" (Cambridge University, Cambridge UK). Joint poster on "Compressed sensing imaging techniques for aperture synthesis by radio interferometry" with Y. Wiaux and G. Puy.
• October 27, 2008: Simple Matlab codes to test the Geometrically optimized Matching Pursuit introduced in "A Geometrical Study of Matching Pursuit Parametrization" (see here).
• September 2008: 2 papers submitted to ICASSP'09 :
  • CMOS Compressed Imaging by Random Convolution, by L. Jacques, P. Vandergheynst, A. Bibet, V. Majidzadeh, A. Schmid, and Y. Leblebici. (more...)
  • Compressive Sampling of Pulse Trains : Spread the Spectrum !, by Farid M. Naini, Rémi Gribonval, Laurent Jacques and Pierre Vandergheynst. (more...)
• September 2008: I'm working in LTS2/EPFL for one more year until July 31th, 2009.
• June 2008: I have just opened my "yet another signal processing (and applied math) blog" on WordPress : "Le Petit Chercheur Illustré".
• 18/04/2008: Fast Noiselets Transform implemented and available in the Codes section (see also this news on Igor's NuitBlanche)
• 19/03/2008: LTS-MMM presentation about "Matching Pursuit : Parametrization Matters."
• February 2008: New paper on "Shape from Texture for Omnidirectional Images" by L. Jacques, E. de Vito, L. Bagnato and P. Vandergheynst, submitted to EUSIPCO08. (... more).
• 18/12/2007: Paper "A geometrical Study of Matching Pursuit Parametrization"
  L. Jacques and C. De Vleeschouwer, accepted to IEEE Trans. Sig. Process.
• 1/9/2007: Visiting Post-doc Researcher at LTS2/EPFL for one year.
• 21/8/2007: New paper on "A geometrical Study of Matching Pursuit Parametrization"
  L. Jacques and C. De Vleeschouwer, submitted to IEEE Trans. Sig. Process.
• 18/7/2007: Paper "Fast spin +-2 spherical harmonics transforms and application in cosmology", Y. Wiaux, L. Jacques, P. Vandergheynst, accepted for publication in Journal of Computational Physics.
• 28/6/2007: Seminar on "A short introduction on Compressed Sensing" in SIDC/ROB
• 1/6/2007: Seminar on "A short introduction on Compressed Sensing" in TELE.
• 30/5/2007: Seminar on the YAWTb matlab toolbox in FYMA.
• 2/1/2007 - 4/30/2007: Short post-doctoral stay in Richard Baraniuk's team, in the DSP Group of Rice University. Learning Compressed Sensing/Sampling of Signals, Images and Manifolds.
• 12/13/2006: Paper "Multiselective pyramidal decomposition of images: wavelets with adative angular selectivity" accepted for publication in IJWMIP (but will be published in September 2007 issue!). More...

"Toute connaissance accessible doit être atteinte par des voies scientifiques ;
ce que la science ne peut pas découvrir, l’humanité ne peut pas le savoir".
-- Bertrand Russell

"Science sans conscience n'est que ruine de l'âme." -- F. Rabelais
"Pseudo-Science n'est que ruine de l'âme." Lisez AFIS