A few words about my research


``Any problem which is non-linear in character, which involves more than one coordinate system (...) is likely to require considerations of topology and group theory for its solution. In the solution of such problems, classical analysis will frequently appear as an instrument in the small, integrated over the whole problem with the aid of topology or group theory.''
Marston Morse, 1934

My Ph.D. thesis, supervised by Pr. Mohamed Daoudi and Dr. Jean-Philippe Vandeborre, dealt with 3D shape modeling using topology abstractions for Computer Graphics and Computer Vision. I designed algorithms for the computation of stable, invariant and expressive topological shape skeletons based on Reeb graphs and applied them in diverse problems such as shape interactive edition, animation reverse engineering, partial shape retrieval or modeling by example (see papers below). This work has been partially supported by the European Network of Excellence Delos No. 507618 and by the ANR (Agence Nationale de la Recherche) through MADRAS project (ANR-07-MDCO-015).
I recently slightly shifted the focus of my research to computational topology and its applications in scientific visualization. Still, my research interests deal with topology and geometry in general, and especially on how topology can enable the generalization of geometry analysis techniques, following the vision of the citation above.

Keywords: Computational topology, Morse theory, Reeb graphs, Contour trees, shape analysis and comparison.

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Publications

Ph.D. Thesis

Reeb graph based 3D shape modeling and applications

Julien Tierny

Ph.D. Thesis, LIFL, USTL.
October 2008.

Committee: A. Baskurt, B. Lévy, C. Labit, A. Srivastava, S. Tison.
Advisors: J.P. Vandeborre, M. Daoudi.

Book Chapters

3D Object Indexing

Stefano Berretti, Mohamed Daoudi, Alberto del Bimbo, Tarik Filali-Ansary, Pietro Pala, Julien Tierny and Jean-Philippe Vandeborre

Chapter of "3D Object Processing: Compression, Indexing and Watermarking".
Ed. Wiley 2008.

International Journals

Loop surgery for volumetric meshes: Reeb graphs reduced to contour trees

Julien Tierny, Attila Gyulassy, Eddie Simon and Valerio Pascucci

IEEE Transactions on Visualization and Computer Graphics,
Proc. of IEEE VIS 2009.
Volume 15(6): pp. 1177-1184, November 2009..

Videos, Paper.
Partial 3D shape retrieval by Reeb pattern unfolding

Julien Tierny, Jean-Philippe Vandeborre and Mohamed Daoudi

Computer Graphics Forum, Eurographics Association, Ed. Blackwell.
Volume 28(1): pp. 41-55, March 2009.


Download software!
Enhancing 3D Mesh Topological Skeletons with Discrete Contour Constrictions

Julien Tierny, Jean-Philippe Vandeborre and Mohamed Daoudi

The Visual Computer, International Journal of Computer Graphics, Ed. Springer.
Volume 24(3): pp. 155-172, March 2008.

International Conferences

Enabling Advanced Visualization Tools in a Web-Based Simulation Monitoring System

Emanuele Santos, Julien Tierny, Ayla Khan, Brad Grimm, Lauro Lins, Juliana Freire, Valerio Pascucci, Claudio Silva, Scott Klasky, Roselyne Barreto, Norbert Podhorszki.

IEEE eScience 2009, Oxford, UK, December 9-11, 2009.

To Appear.
A Topological Framework for the Interactive Exploration of Large Scale Turbulent Combustion

Peer-Timo Bremer, Gunther Weber, Julien Tierny, Valerio Pascucci, Marcus Day, John Bell.

IEEE eScience 2009, Oxford, UK, December 9-11, 2009.

To Appear.
Fast and precise kinematic skeleton extraction of 3D dynamic meshes

Julien Tierny, Jean-Philippe Vandeborre and Mohamed Daoudi

IEEE ICPR 2008, IEEE International Conference on Pattern Recognition, Tampa, Florida, USA, December 8-11, 2008.
Reeb chart unfolding based 3D shape signatures

Julien Tierny, Jean-Philippe Vandeborre and Mohamed Daoudi

Eurographics 2007, Annual Conference of the European Association for Computer Graphics, short paper, Prague, Czech Republic, September 3-7, 2007.
pp. 13-16.
Topology driven 3D mesh hierarchical segmentation

Julien Tierny, Jean-Philippe Vandeborre and Mohamed Daoudi

IEEE Shape Modeling International 2007, IEEE International Conference on Shape Modeling and Applications, short paper, Lyon, France, June 13-15, 2007.
pp. 215-220.
3D Mesh Skeleton Extraction Using Topological and Geometrical Analyses

Julien Tierny, Jean-Philippe Vandeborre and Mohamed Daoudi

Pacific Graphics 2006, 14th Pacific Conference on Computer Graphics and Applications, Taipei, Taiwan, October 11-13, 2006.
pp. 85-94.
Invariant High-Level Reeb Graphs of 3D Polygonal Meshes

Julien Tierny, Jean-Philippe Vandeborre and Mohamed Daoudi

IEEE 3DPVT 2006, 3rd IEEE International Symposium on 3D Data Processing, Visualization and Transmission, Chapel Hill, North Carolina, USA, June 14-16, 2006.
pp. 105-112.

International Invited Conferences

Geometry flavored topological skeletons: Applications to shape handling, segmentation and retrieval

Julien Tierny, Jean-Philippe Vandeborre and Mohamed Daoudi

Second DELOS Conference on Digital Libraries, Pisa, Italy. December 2-7, 2007.
3D Mesh Models: View-Based Indexing and Structural Analysis

Mohamed Daoudi, Tarik Filali-Ansary, Julien Tierny and Jean-Philippe Vandeborre

First DELOS Conference on Digital Libraries, Pisa, Italy, February 13-14, 2007. Lecture Notes in Computer Science.
pp. 298-307.

Local Conferences (in French)

Signatures de formes 3D par dépliage de cartes de Reeb

Julien Tierny, Jean-Philippe Vandeborre et Mohamed Daoudi

12èmes Journées CORESA (COmpression et REprésentation des Signaux Audiovisuels), Montpellier, France, 8-9 Novembre 2007.
pp. 242-246.
Graphes de Reeb de Haut Niveau de Maillages Polygonaux 3D

Julien Tierny, Jean-Philippe Vandeborre et Mohamed Daoudi

11èmes Journées CORESA (COmpression et REprésentation des Signaux Audiovisuels), Caen, France, 9-10 Novembre 2006.
pp. 172-177.

Local Workshops (in French)

Analyse topologique et géométrique de maillages 3D pour l'extraction de squelette

Julien Tierny, Jean-Philippe Vandeborre et Mohamed Daoudi

19th French Chapter of Eurographics - 19ème Journées de l'Association Française d'Informatique Graphique et de l'Association Chapitre Français d'Eurographics (AFIG), Bordeaux, France, 22-24 Novembre 2006.
pp. 1-8.

Technical Reports

Description, Matching and Retrieval by Content of 3D Objects

Information Storage and Retrieval Task Members

DELOS Research Activities - Information Society Technologies - ISBN 2-912335-22-1
pp. 49-51.
A novel method for constructing meaningful Reeb graphs from PL functions over 2-manifolds

Julien Tierny, Tarik Filali-Ansary and Jean-Philippe Vandeborre

Rapport interne au Laboratoire d'Informatique Fondamentale de Lille (LIFL - UMR USTL/CNRS 8022) Ref. 05-2005, December 2005.

Software

SINAMIS Is Not A Mesh Indexing System
Benchmarking tools and partial 3D shape retrieval system implementation.
Paper page: Partial 3D shape retrieval by Reeb pattern unfolding.

Seminars

"Loop surgery for volumetric meshes: Reeb graphs reduced to contour trees"
Scientific Computing and Imaging Institute, University of Utah, VisLunch April 17th, 2009.

"Modélisation de forme 3D par graphe de Reeb et applications"
IGG Research Group, LSIIT, Strasbourg, September 26th, 2008.

"Modélisation de forme 3D par graphe de Reeb et applications"
LAIC, Clermont Ferrand, September 25th, 2008.

"Squelettes topologiques de surfaces maillées et applications"
ALICE Research Group, INRIA-LORIA, Nancy, February 5th, 2008.

"Geometry flavored topological skeletons. Application to shape retrieval"
University of Genova, AIM@SHAPE Summer School, June 22nd, 2007.

"Analyse topologique et géométrique de maillages 3D pour l'extraction de squelettes"
TELECOM Paris, GdR ISIS, October 19th, 2006.

"Enrichissement des squelettes topologiques par détection de constrictions"
Université François-Rabelais, Tours, October 3rd, 2006.

Review work

International Journals:
Theoretical Computer Science, Computer-Aided Design, Image and Vision Computing.

International Conferences:
Eurographics 2010,
IEEE Visualization 2009, Eurographics 2009, EuroVis 2009, IEEE SIBGRAPI 2009,
ACM SPM 2008, IEEE SMI 2008, IEEE ICME 2008,
IEEE ICME 2007.

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Updated on February 5, 2010.