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Pierre Kornprobst

Inria Researcher

Université Cote d'Azur
Inria Sophia Antipolis Méditerranée
Biovision team
France

Email: pierre.kornprobst@inria.fr
Phone: +33(0)4-9238-7979
Address: 2004 Route des Lucioles-BP 93
06902 Sophia Antipolis

General interest: Vision.

How to solve artificial vision task? How visual system works? How new computer vision methods could be developed from biological insights? How technology could help low-vision people?

  Learn more about my research trajectory

Responsibilities

NEWS

(10/2016: new paper) The relative contribution of noise and adaptation to competition during tri-stable motion perception, A. Meso, J. Rankin, O. Faugeras, P. Kornprobst G. Masson, Journal of Vision

(05/2016: new paper) The wave of first spikes: a retinal information coding strategy revealed by large-scale multielectrode array recordings, G. Portelli, J.M. Barrett, G. Hilgen, T. Masquelier, A. Maccione, S. Di Marco, L. Berdondini, P. Kornprobst, E. Sernagor, eNeuro

(04/2016: new preprint) Pan-retinal characterization of Light Responses from Ganglion Cells in the Developing Mouse Retina, by G. Hilgen, S. Pirmoradian, D. Pamplona, P. Kornprobst, B. Cessac, M. H Hennig, E. Sernagor. Available on BioRxiv

(04/2016: new paper) Bio-Inspired Computer Vision: Towards a Synergistic Approach of Artificial and Biological Vision, N.V.K. Medathati, H. Neumann, G.S. Masson and P. Kornprobst, Computer Vision and Image Understanding, 2016

(04/2016: new paper) Microsaccades enable efficient synchrony-based coding in the retina: a simulation study, T. Masquelier, G. Portelli and P. Kornprobst. Scientific Reports 6, Article number: 24086, 2016.

(04/2016: new conference) A new nonconvex variational approach for sensory neurons receptive field estimation, A. Drogoul, G. Aubert, B. Cessac and P. Kornprobst, 6th International Workshop on New Computational Methods for Inverse Problems (NCMIP).

(01/2016) Biovision team created!


BOOKS

Modeling in Computational Biology and Biomedicine: A Multidisciplinary Endeavor. Frederic Cazals and Pierre Kornprobst, Eds, Springer, 2013: Computational biology and biomedicine is a vast field where intensive research is currently being carried out, with outstanding perspectives both in terms of the complexity of the scientific problems to be addressed and technological developments to be made. Taking up these challenges requires developing an enhanced synergy between biology and biomedicine on the one hand, and applied mathematics and computer science on the other hand. In line with this observation, the motivation to write this book has been to show that researchers trained in more quantitative and exact sciences can make major contributions in this emerging discipline, and those with roots in biology and biomedicine can benefit from a true leveraging power tailored to their specific needs.

Mathematical problems in image processing: Partial Differential Equations and the Calculus of Variations G. Aubert and P. Kornprobst, Springer, Applied Mathematical Sciences, Vol 147, 2006 (second edition): Amongst the numerous approaches which have been suggested, we focus on Partial Differential Equations (PDE's), and Variational Approaches in this book. Traditionally applied in physics, these methods have been successfully and widely transferred in Computer Vision other the last decades. One of the main interests in using PDEs is that the theory behind the concept is well-established. Of course, PDEs are written in a continuous setting refering to analog images, and once the existence and the uniqueness have been proven, we need to discretize them in order to find a numerical solution. It is our conviction that reasoning within a continuous framework makes the understanding of physical realities easier and stimulates the intuition necessary to propose new models. We hope that this book will illustrate this idea effectively.

PAPERS

The wave of first spikes: a retinal information coding strategy revealed by large-scale multielectrode array recordings, G. Portelli, J.M. Barrett, G. Hilgen, T. Masquelier, A. Maccione, S. Di Marco, L. Berdondini, P. Kornprobst, E. Sernagor, eNeuro.

Bio-Inspired Computer Vision: Towards a Synergistic Approach of Artificial and Biological Vision, N.V.K. Medathati, H. Neumann, G.S. Masson and P. Kornprobst, Computer Vision and Image Understanding, 2016.

Microsaccades enable efficient synchrony-based coding in the retina: a simulation study, T. Masquelier, G. Portelli and P. Kornprobst. Scientific Reports 6, Article number: 24086, 2016.

What can we expect from a V1-MT feedforward architecture for optical flow estimation? F. Solari, M. Chessa, N.V.K. Medathati, and P. Kornprobst. Note: Our code is available on ModelDB.

Bifurcation Study of a Neural Fields Competition Model with an Application to Perceptual Switching in Motion Integration, J. Rankin, A. I. Meso, G. S. Masson, O. Faugeras, and P. Kornprobst. Journal of Computational Neuroscience, Vol. 36, No. 2, pp. 193--213, 2014.

Bifurcation analysis applied to a model of motion integration with a multistable stimulus, J. Rankin, È. Tlapale, R. Veltz, O. Faugeras, and P. Kornprobst. Journal of Computational Neuroscience, Vol. 34, No. 1, pp. 103--124, 2013. Try the stimulus (fix the center)!

Streaming an image through the eye: The retina seen as a dithered scalable image coder, K. Masmoudi, M. Antonini, and P. Kornprobst. Signal Processing: Image Communication 28 (8), pp. 856--869, 2013.

Frames for Exact Inversion of the Rank Order Coder, K. Masmoudi and M. Antonini, and P. Kornprobst. IEEE Transactions on Neural Networks and Learning Systems, 23(2):353-359, 2012.

Action recognition via bio–inspired features: The richness of center-surround interaction, M.J. Escobar and P. Kornprobst. Computer Vision and Image Understanding, 116(5):593-605, 2012. You can watch the Audioslide presentation of Audioslide presentation of that paper

Variational multi-valued velocity field estimation for transparent sequences, A. Ramirez, M. Rivera, Pierre Kornprobst, and F. Lauze. Journal of Mathematical Imaging and Vision, 40(3):285–304, 2011.

Neural mechanisms of motion detection, integration, and segregation: From biology to artificial image processing systems. J.D. Bouecke, E. Tlapale, P. Kornprobst, and H. Neumann. EURASIP Journal on Advances in Signal Processing, vol 2011, Special issue on Biologically inspired signal processing: Analysis, algorithms, and applications, 2011.

Modelling the dynamics of motion integration with a new luminance-gated diffusion mechanism. E. Tlapale, G. S. Masson, and P. Kornprobst. Vision Research, 50(17):1676-1692, 2010.

Virtual Retina: A biological retina model and simulator, with contrast gain control. A. Wohrer and P. Kornprobst. Journal of Computational Neuroscience, 26(2):219, 2009. This simulator is open-source (see Software section)

Bilateral Filtering: Theory and Applications. S. Paris, P. Kornprobst, J. Tumblin, and F. Durand. Foundations and Trends in Computer Graphics and Vision, 4(1):1-73, 2009. This paper is a summary of tutorials given at SIGGRAPH and CVPR (see TALKS/COURSES section)

Action Recognition Using a Bio-Inspired Feedforward Spiking Network. M.-J. Escobar, G. S. Masson, T. Vieville, and P. Kornprobst. International Journal of Computer Vision, 82(3):284, 2009.

Can the Nonlocal Characterization of Sobolev Spaces by Bourgain et al. Be Useful for Solving Variational Problems? G. Aubert and P. Kornprobst. SIAM J. Numer. Anal. 47(2):844-860, 2009.

How do high-level specifications of the brain relate to variational approaches? T. Vieville, S. Chemla, and P. Kornprobst. Journal of Physiology Paris, 101(1-3):118-135, 2007.

The use of superresolution techniques to reduce slice thickness in functional MRI. R.R. Peeters, P. Kornprobst, M. Nikolova, S. Sunaert, T. Vieville, G. Malandain, R. Deriche, O. Faugeras, M. Ng, and P. Van Hecke. International Journal of Imaging Systems and Technology (IJIST), Special issue on High Resolution Image Reconstruction, 14:131–138, 2004.

Image sequence analysis via partial differential equations. P. Kornprobst, R. Deriche, and G. Aubert. Journal of Mathematical Imaging and Vision, 11(1):5-26, 1999.

A mathematical study of the relaxed optical flow problem in the space BV. G. Aubert and P. Kornprobst. SIAM Journal on Mathematical Analysis, 30(6):1282-1308, 1999.

Computing optical flow via variational techniques. G. Aubert, R. Deriche, and P. Kornprobst. SIAM Journal of Applied Mathematics, 60(1):156-182, 1999.

To learn more, you can check my full publication list, including conferences with proceedings



POSTDOCs

Current

Audric Drogoul (since 2014)
Variational approaches for receptive field estimation & delayed neural field equations (with Romain Veltz)

Daniela Pamplona (since 2014)
Retina modeling & new approaches for receptive field estimation.

Past

Geoffrey Portelli (2012-2015)
Understanding the wave of first spike (from MEA recordings) & the role of micromovements (from simulations)
Now: Postdoctoral researcher at I3S, CNRS-Université de Nice-Sophia Antipolis, MinD team

James Rankin (2010-2013)
Perceptual switching in motion integration
Now: Lecturer in Mathematical Biology at Exeter University, UK

Vivien Robinet (2010-2011)
Neural network functional connectivity from spike train analysis
Now: Assistant professor, Université des Antilles et de la Guyane (UAG)

Neil Bruce (2008-2010)
Models of saliency for video-surveillance systems
Now: Assistant professor, University of Manitoba, Canada


PHDs


Current

N. V. Kartheek Medathati (2013-2016)
Motion perception and attention: from visual neuroscience to artificial vision systems
co-supervised with Guillaume Masson (INT)
Defence: Dec. 13, 2016

Past

Khaled Masmoudi (2008-2012)
Conception of Novel Bio-Inspired Coding Systems
co-supervised with Marc Antonini (CNRS, I3S)
Now: C++/C# developer at AVM-Informatique

Emilien Tlapale (2009-2011)
Modelling the dynamics of contextual motion integration in the primate
co-supervised with Guillaume Masson (INT)
Now: R&D 3D Engineer at Airbus DS Geo

Maria-Jose Escobar (2006-2009)
Bio-Inspired Models for Motion Estimation and Analysis: Human action recognition and motion integration
co-supervised with Guillaume Masson (INT)
Now: Researcher at UTFSM (Chile)

Adrien Wohrer (2004-2008)
Model and large-scale simulator of a biological retina, with contrast gain control
Now: Assistant professor at Université d'Auvergne in Clermont-Ferrand (France)



Intersnhips


Current

Alberto Patiño Saucedo
Image transforms for low-vision
co-supervised with Fabio Solari (University of Genova)

Marco Benzi Tobar
Retina-inspired tone mapping
co-supervised with Adrien Bousseau (Inria, GraphDeco project team) and Maria-Jose Escobar (UTFSM)


SOFTWARE

VIRTUAL RETINA: A bio-inspired retina simulator for large-scale spiking simulations. It transforms your videos into spike trains. You can install it or run it through ENAS.

ENAS: A free access user-end software for the analysis of collective spike trains statistics oriented toward retina data analysis and simulation, devoted to the neuroscience community. (learn more)

AB filter: this library implements the physiological plausible filters proposed by Adelson and Bergen (1985)

PDE library: A CImg plugin with classical image restoration and segmentation approaches (a new version is in preparation)

TALKS/COURSES

Founder and coordinator of the Master of Science in Computational Biology and Biomedicine, Université Nice Sophia Antipolis, from Nov. 2008 until Sept. 2011.

A Gentle Introduction to Bilateral Filtering and its Applications: A class at ACM SIGGRAPH 2008, CVPR 2008 and ACM SIGGRAPH 2007 with S. Paris, J. Tumblin, and F. Durand

Introduction to PDEs and variational approaches in image processing (in french)

Traitement des images numériques, G. Aubert and P. Kornprobst. In J. Akoka and I. Comyn-Wattiau, editors, Encyclopédie de l’informatique et des systèmes d’information, number 6, chapter 18, pages 861—879. Vuibert, November 2006.

Introduction to image processing (in french)

OTHER

Networking

Join us on the Biological and Computer Vision Interfaces group

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Collaborators

Gilles Aubert (Université Nice Sophia Antipolis, France), Eric Castet, Bruno Cessac (Inria, France), Maria-Jose Escobar (Universidad Técnica Federico Santa María, Chile), Matthias Henning (University of Edimburg, UK), Guillaume S. Masson (Insitut des Neurosciences de la Timone, France), Heiko Neumann (Ulm University, Germany), S. Paris (Adobe, USA), James Rankin (New York University, USA), Evelyne Sernagor (University of Newcastle, UK), Fabio Solari (University of Genova, Italy), Timothée Masquelier (Institut de la Vision, France)

Grants

Renvision (2013-2016), Mathemacs (2012-2015), BrainScaleS (2011-2015), SEARISE (2008-2011), FACETS (2007-2010).

(Last update: October 2016)