Colas Schretter

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Contact
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News

July 5, 2015: I added to the list of publications (see below) the manuscripts of my two papers for the IEEE summer conferences: EMBC in Milano, August and ICIP in Quebec, Canada, September.

Bio

Timeline

I completed the M.Sc. degree in computer science with great honors in 2004 and received an additional Master of advanced studies (DEA) in 2006 from the Université libre de Bruxelles, Belgium. In February 2007, I moved to Germany for a scientist position with Philips Research, Aachen. Meanwhile, I earned a Marie Curie EST fellowship for my doctoral thesis, awarded with magna cum laude in April 2010, at the Otto-von-Guericke University. Thereafter, I won a Marie Curie ERG grant for my postdoctoral project with the RWTH Aachen University and was visiting researcher at the Politecnico di Milano, Italy. I was selected for a M+Vision 2012 fellowship at the MIT in Cambridge, USA. I am now back in Belgium since October 2013, as a iMinds research scientist at the Department of Electronics and Informatics of the Vrije Universiteit Brussel.

Projects

Results

I am developing sparse models and online statistical algorithms for image reconstruction.

Brussels Interest Group on Sparsity (BIGS)

Effective Thinking in C++

Colas' Demomaking

OligoFaktory SE

Click on the images to open linked websites.

Publications

An exhaustive list of publications spans below, with my fellow co-authors: Adrian Munteanu, Vrije Universiteit Brussel, Belgium. — Alfonso A. Isola, Erasmus Medical Center, Rotterdam, The Netherlands. — Ann Dooms, Vrije Universiteit Brussel, Belgium. — Beatrice Pesquet-Popescu, TELECOM ParisTech, France. — Carsten Meyer, Philips Research, Germany. — Catarina de Brito Carvalho, Katholieke Universiteit Leuven, Belgium. — Christoph Neukirchen, Philips Research, The Netherlands. — Fabian Pilatus, RWTH Aachen University, Germany. — Fr├ęderic Dufaux, TELECOM ParisTech, France. — Georg Rose, Otto von Guericke University, Magdeburg, Germany. — Gianluca Bontempi, Université libre de Bruxelles, Belgium. — Harald Niederreiter, RICAM, Austrian Academy of Sciences, Austria. — Ignace Loris, Université libre de Bruxelles, Belgium. — Jan D'hooge, Katholieke Universiteit Leuven, Belgium. — Jason N. Hill, Massachusetts Institute of Technology, MA, USA. — Jeffrey A. Fessler, The University of Michigan, US. — Jianyong Sun, University of Greenwich, UK. — Laurent Gatto, University of Cambridge, UK. — Leif Kobbelt, RWTH Aachen University, Germany. — Martha L. Gray, Massachusetts Institute of Technology, MA, USA. — Mathieu Gerber, Université de Lausanne, Switzerland. — Matthias Bertram, Philips Research, The Netherlands. — Michael Grass, Hamburg University of Technology, Philips Research, Hamburg, Germany. — Michel C. Milinkovitch, Université de Genève, Switzerland. — Nicolas Chopin, ENSAE ParisTech, France. — Patrick E. Meyer, Université de Liège, Belgium. — Paul-Olivier Dehaye, University of Zurich, Switzerland. — Peter Schelkens, Vrije Universiteit Brussel, Belgium. — Pieter Slagmolen, Katholieke Universiteit Leuven, Belgium. — Ralph Brinks, German Diabetes Center, Germany. — Se Young Chun, Ulsan National Institute of Science and Technology, Korea. — Stijn Bettens, Vrije Universiteit Brussel, Belgium. — Shaun Bundervoet, Vrije Universiteit Brussel, Belgium. — Til Aach, RWTH Aachen University, Germany. — Tim Bruylants, Vrije Universiteit Brussel, Belgium. — Wiro J. Niessen, Erasmus Medical Center, Rotterdam, The Netherlands. — Yafei Xing, TELECOM ParisTech, France. — Yan Hao, Shanghai Jiao Tong University, China. — Zhijian He, Tsinghua University, China.

Journal papers

Colas Schretter and Harald Niederreiter, A Direct Inversion Method for Non-Uniform Quasi-Random Point Sequences, Monte Carlo Methods and Applications, vol. 19, no. 1, pp. 1–9, 2013. Link

Colas Schretter, Leif Kobbelt and Paul-Olivier Dehaye, Golden Ratio Sequences for Low-Discrepancy Sampling, Journal of Graphics Tools, vol. 16, no. 2, pp. 95–104, 2012. Link

Colas Schretter, Georg Rose and Matthias Bertram, Image-Based Iterative Compensation of Motion Artifacts in Computed Tomography, Medical Physics, vol. 36, no. 11, pp. 5323–5330, 2009. Link

Laurent Gatto and Colas Schretter, Designing Primer Pairs and Oligos with OligoFaktorySE, EMBnet news, vol. 15, no. 3, pp. 22–24, 2009. Link

Colas Schretter, Event-by-Event Image Reconstruction From List-Mode PET Data, IEEE Transactions on Image Processing, vol. 8, no. 1, pp. 117–124, 2009. Link

Patrick E. Meyer, Colas Schretter and Gianluca Bontempi, Information-Theoretic Feature Selection in Microarray Data Using Variable Complementarity, IEEE Journal of Selected Topics in Signal Processing, vol. 2, no. 3, pp. 261–274, 2008. Link

Colas Schretter, A Fast Tube of Response Ray-Tracer, Medical Physics, vol. 33, no. 12, pp. 4744–4748, 2006. Link

Colas Schretter and Michel C. Milinkovitch, OligoFaktory: A Visual Tool for Interactive Oligonucleotide Design, Bioinformatics, vol. 22, no. 1, pp. 115–116, 2006. Paper

Colas Schretter, A Brush Tool for Interactive Texture Synthesis, ICGST International Journal on Graphics, Vision and Image Processing, vol. 6, no. 5, pp. 55–60, 2005. Link

Colas Schretter, Discover OligoFaktory Standalone Edition, EMBnet news, vol. 11, no. 4, pp. 24–25, 2005. Link

Invited lectures

Colas Schretter, Constructing Quasi-Random Points with the Golden Ratio Sequence and the Hilbert Space Filling Curve, Conference on Monte Carlo and Quasi-Monte Carlo Methods in Scientific Computing, Leuven, Belgium, April 6-11, 2014. (Joint work with Harald Niederreiter.)

Colas Schretter, Séquences et ensembles quasi-aléatoires, Brussels Summer School of Mathematics (BSSM), Brussels, Belgium, August 1-7, 2013.

Colas Schretter, Jason N. Hill and Martha L. Gray, Wake-Up to Bruxism: Sleep Monitoring and Personalized Audio Feedback on your Smartphone, MIT Future of Health and Wellness Conference, Cambridge, February 6-7, 2013. MIT Sloan BioInnovations Conference, Cambridge, February 22, 2013. Poster

Colas Schretter, Hierarchical B-Spline Mixture Models for TOF-PET Image Reconstruction, M+Vision Open-House, Madrid, Spain, July 19-20, 2012.

Colas Schretter and Leif Kobbelt, Golden Ratio Sequences for Low-Discrepancy Sampling, HiGraphics, Hirschegg, Austria, March 27-31, 2011.

Alfonso A. Isola, Colas Schretter, Michael Grass, Matthias Bertram, Georg Rose and Wiro J. Niessen, Compensation of Periodic Cardiac Motion and Non-Periodic Abdominal Motion in Cone-Beam CT, Marie Curie Monitoring Mission, Alexander von Humboldt Foundation, Bonn, Germany, January 29-30, 2009. Poster

Colas Schretter, Improving Image Quality in Computed Tomography by Motion Estimation and Compensation, 8th IEEE EMBS International Summer School on Biomedical Imaging, Berder, France, June 20-28, 2008.

Technical reports

Colas Schretter, Computing Random Points on Sphere, Boost C++ Ticket 1059, June, 2007. Link

Colas Schretter and Laurent Gatto, A Tiny Queuing System for Blast Servers, December, 2005. Link

Colas Schretter and Michel C. Milinkovitch, Automated Long Oligo Design on Consensus Regions of Similar Genomes, Technical Report UEG, IBMM, ULB, 2005.

Colas Schretter and Michel C. Milinkovitch, Oligonucleotide Design by Multilevel Optimization, Technical Report UEG, IBMM, ULB, 2005. Link

Dissertations

Colas Schretter, Correction of Non-Periodic Motion in Computed Tomography, Doctoral thesis, Otto-von-Guericke University, Magdeburg, Germany, April, 2010. Link

Colas Schretter, New Algorithms for Image Reconstruction From Emission Tomography List-Mode Data, DEA thesis, Université libre de Bruxelles, Brussels, Belgium, September, 2006.

Colas Schretter, Efficient N-Body Algorithms for Astrophysical Simulations, Master thesis, Université libre de Bruxelles, Brussels, Belgium, June, 2003.

Patents

Colas Schretter, Matthias Bertram and Christoph Neukirchen, Method and Apparatus For Large Field of View Imaging and Detection and Compensation of Motion Artifacts, US 30961/04024, January, 2009. Link

Peter Forthmann, Thomas Koehler, Udo Van Stevendaal, Matthias Bertram, Steffen Hohmann and Colas Schretter, Method and Apparatus to Improve CT Image Acquisition Using Displaced Geometry, US 30961/04021, September, 2008. Link

Conference Papers

Colas Schretter, Ignace Loris, Ann Dooms and Peter Schelkens, Efficient scalable compression of sparsely sampled images, IEEE International Conference on Image Processing 2015, Quebec City, Canada, September 27-30 2015. Paper

Colas Schretter, Jianyong Sun, Shaun Bundervoet, Ann Dooms, Peter Schelkens, Catarina de Brito Carvalho, Pieter Slagmolen and Jan D'hooge Continuous Ultrasound Speckle Tracking with Gaussian Mixtures, IEEE Engineering in Medicine and Biology Conference 2015, Milano, Italy, August 25-29 2015. Paper

Ayyoub Ahar, David Blinder, Tim Bruylants, Colas Schretter, Adrian Munteanu, Peter Schelkens, Evaluation inter- and intra-channel correlations of representations for the compression of holograms, Applications of Digital Image Processing XXXVIII, vol. 9599, SPIE Optics and Photonics 2015.

David Blinder, Ayyoub Ahar, Athanasia Symeonidou, Yafei Xing, Tim Bruylants, Colas Schretter, Beatrice Pesquet-Popescu, Fr├ęderic Dufaux, Adrian Munteanu and Peter Schelkens Open Access Database for Experimental Validations of Holographic Compression Engines, Seventh International Workshop on Quality of Multimedia Experience (QoMEX 2015), Costa Navarino, Greece, May 26-29 2015.

Stijn Bettens, Hao Yan, Shaun Bundervoet, Colas Schretter, Ann Dooms, and Peter Schelkens Reconstruction Resilience to Subsampling in Compressive Fresnel Holography, OSA Digital Holography & 3-D Imaging Meeting, paper DT1A.3, Shanghai, China, May 24-28 2015.

Colas Schretter, Ignace Loris, Ann Dooms and Peter Schelkens, Total Variation Reconstruction From Quasi-Random Samples, iTWIST'14, international - Traveling Workshop on Interactions between Sparse models and Technology, Namur, Belgium, August 27-29 2014. Paper, Poster

Shaun Bundervoet, Colas Schretter, Ann Dooms and Peter Schelkens, Bayesian Estimation of Sparse Smooth Speckle Shape Models for Motion Tracking in Medical Ultrasound, iTWIST'14, international - Traveling Workshop on Interactions between Sparse models and Technology, Namur, Belgium, August 27-29 2014. Paper, Poster

Colas Schretter, Jianyong Sun and Leif Kobbelt, Online Estimation of B-Spline Mixture Models From TOF-PET List-Mode Data, Proc. of the 11th International Meeting on Fully Three-Dimensional Image Reconstruction in Radiology and Nuclear Medicine, Potsdam, Germany, July 11-15, pp. 274–277, 2011. Paper

Se Young Chun, Colas Schretter and Jeffrey A. Fessler, Sufficient Condition for Local Invertibility of Spatio-Temporal 4D B-Spline Deformations, Proc. of the 7th IEEE International Symposium on Biomedical Imaging, Rotterdam, The Netherlands, April 14-17, pp. 1221–1224, 2010. Link, Poster

Colas Schretter, Fabian Pilatus, Georg Rose, Til Aach and Matthias Bertram, Optical Flow Motion Estimation for Approximate Motion Compensation in Cone-Beam CT, Proc. of the 10th International Meeting on Fully Three-Dimensional Image Reconstruction in Radiology and Nuclear Medicine, Beijing, China, September 5-10, pp. 327–330, 2009. Paper

Colas Schretter, Christoph Neukirchen, Georg Rose and Matthias Bertram, Optimal Pre-Filtering for Linear Interpolation in Computed Tomography, Proc. of the 2nd Workshop on High-Performance Image Reconstruction, Beijing, China, September 6, pp. 29–32, 2009. Paper

Colas Schretter, Online PET Reconstruction From List-Mode Data, Proc. of the 10th International Meeting on Fully Three-Dimensional Image Reconstruction in Radiology and Nuclear Medicine, Beijing, China, September 5-10, pp. 195–198, 2009. Paper, Poster

Colas Schretter, Christoph Neukirchen, Georg Rose and Matthias Bertram, Image-Based Iterative Compensation of Motion Artifacts in Computed Tomography, SPIE Medical Imaging, Lake Buena Vista, USA, February 7-12, vol. 7258, pp. 1W–8, 2009. Link

Colas Schretter, Christoph Neukirchen, Georg Rose and Matthias Bertram, Local Correction of Non-Periodic Motion in Computed Tomography, SPIE Medical Imaging, Lake Buena Vista, USA, February 7-12, vol. 7258, pp. 2M–12, 2009. Link, Poster

Colas Schretter, Christoph Neukirchen, Matthias Bertram and Georg Rose, Correction of Some Time-Dependent Deformations in Parallel-Beam Computed Tomography, Proc. of the 5th IEEE International Symposium on Biomedical Imaging, Paris, France, May 14-17, pp. 764–767, 2008. Link

Ralph Brinks, Colas Schretter and Carsten Meyer, Comparison of Maximum-Likelihood List-Mode Reconstruction Algorithms in PET, Proc. of the IEEE Nuclear Science Symposium and Medical Imaging Conference, San Diego, USA, October 29 - November 4, vol. M11-389, pp. 2801–2803, 2006. Link

Colas Schretter, Laurent Gatto and Michel C. Milinkovitch, OligoFaktory: A Web Portal for Interactive Oligonucleotide Design, First BENELUX Bioinformatics Conference, Ghent, Belgium, April 14-15, 2005. Poster