Number of documents

43

Franck Hétroy-Wheeler

Position

Professor in computer science at the since september 2017.

This means I am both:

teaching at the department of mathematics and computer science of the university;

and a researcher in the Engineering science, computer science and imaging laboratory , in the IGG team.

Contact

Lab. iCube, IGG team

300 bd Sébastien Brant

CS 10413

F-67412 Illkirch Cedex, France

E-mail: hetroywheeler@unistra.fr

CV

Diplomas: M.Eng. (diplôme d'ingénieur) Grenoble INP - Ensimag (Univ. Grenoble, 2000), M.Sc. (DEA) in applied maths (Univ. Grenoble, 2000), PhD (doctorat) in signal processing (Univ. Grenoble, 2003), Habilitation (HDR) in computer science (Univ. Grenoble, 2015).

Positions: teaching assistant Univ. Grenoble (2002-2003), postdoc UPC Barcelona (2004), tenured assistant professor (maître de conférences) Grenoble INP - Ensimag/Laboratoire Jean Kuntzmann (2004-2017, EVASION then Morpheo research teams).

Teaching

Teaching statement

My teaching philosophy is to help students become autonomous in their learning process. For this purpose, they need to face knowledge, problems and methods of increasing complexity according to Bloom's taxonomy. I strongly believe students can durably understand something only if the learning process follows the main ideas of Jean Houssaye's educational triangle. I also like to make students work in groups in order to confront and increase their soft skills, e.g. following an agile methodology.

Responsability

Head (with Caroline Essert) of the Image track of the Master Curriculum in Engineering (CMI) of the University of Strasbourg

Lectures

Digital geometry for 1st year master students in computer science (Spring 2018 to 2021)
Advanced algorithms for 1st year master students in computer science (Autumn 2018 to 2020)
Data structures and algorithms for 2nd year bachelor students in computer science (Autumn 2017 to 2020)
Applied numerical analysis for 2nd year bachelor students in computer science (Autumn 2020)
Knowledge and practice of computers for 1st year bachelor students in maths and computer science (Spring 2019 to 2021)
Scientific literature projects (organizer) for 2nd year CMI students in computer science (Spring 2021)
University work methodologies for 1st year bachelor students in maths and computer science (Autumn 2018 and 2019)
Algorithms and programming for 1st year bachelor students in maths and computer science (Spring 2018)

Research

Research statement

My work spans computer vision and computer graphics to computational geometry and topology and to remote sensing. With an overall goal of shape analysis and understanding, my research interests include the acquisition, reconstruction and processing of 3D shapes in motion. I have worked on shapes digitised with laser scanners as well as multi-view stereo systems or medical imagery. These shapes range from human bodies and organs to animals, trees, plants or even mechanical parts. Currently I am especially interested in trees and plants, because of their challenging geometric and topological complexities.

Popularisation

Check the presentation I made (in French) about digital geometry processing in 2014 (part 1, part 2). Also check this video by Eric Casella.

More details (works before 2016)

Keywords

Digital geometry processing, segmentation, reconstruction, geometric and topological feature computation.

Projects

Crop3D (PI, 2018-2021). CIFRE PhD scholarship from ANRT with Arvalis.
ROMI (2017-20121, as a member of Inria MOSAIC team). H2020 European project, € 3868k.
SimPFI (PI, 2019-2021). IDEX funding from the University of Strasbourg, € 59k. Collaboration with Forest Research.

Past projects

Carambole (PI, 2016-2017). Exploratory grant from LabEx PERSYVAL-lab, € 9k.
Digitree (PI, 2015-2018). AGIR grant from Univ. Grenoble Alpes, € 96k.
ACHMOV (2014-2018). ANR grant, € 286k.
ASLAAF (PI, 2014-2015). AGIR grant from Grenoble INP, € 15k.
PADME (2013-2016). ARC6 grant from Région Rhône-Alpes, € 98k.
MORPHO (2010-2015, coordinator from 2012 to 2015). ANR grant, € 482k.
PlantScan3D (2009-2011). Grants from the Agropolis foundation and Inria, € 118k.
IDEAL (2009). BQR grant from Grenoble INP, € 40k.
MADRAS (2008-2011). ANR grant, € 330k.
MEGA (PI, 2006-2008). Grants from Grenoble INP, UJF and Inria, € 55k.

Students

PhD students

Mélinda Boukhana (started March 2018). Topic: Camera position optimisation for crop 3D acquisition and plant organ characterization. Part of the Crop3D project. Other advisors: Frédéric Baret (INRA Avignon) and Benoît de Solan (Arvalis).
Katia Mirande (started November 2018). Topic: 3D segmentation and growth tracking of plant point clouds in field conditions. Part of the ROMI project. Other advisor: Christophe Godin (Inria Lyon).

Former students

Postdoc

Joris Ravaglia (2019-2020). Topic: Designing a simulator for planning Terrestrial laser scanner-based forest inventories. Part of the SimPFI project. Other advisor: Eric Casella (Forest Research, UK).
Dobrina Boltcheva (2009-2011). Computation of the homology of simplicial complexes (2009-2010); virtual plant reconstruction mixing incomplete geometric data and a priori knowledge (2010-2011). Other advisors: Jean-Claude Léon (Grenoble INP, 2009-2010) and with Marie-Paule Cani (Grenoble INP, 2010-2011). Dobrina is now associate professor at Univ. Nancy (IUT Saint Dié).

PhD students

Romain Rombourg (2015-2019). Terrestrial laser scanner noise analysis, modelling and detection. Other advisor: Eric Casella (Forest Research, UK).
Jinlong Yang (2015-2019). Learning shape spaces of dressed 3D human models in motion. Other advisor: Stefanie Wuhrer (Inria Grenoble). Jinlong is now a postdoc at the Max Planck Institute for Intelligent Systems (Tübingen, Germany).
Li Wang (2013-2017). Algorithms and criteria for volumetric centroidal Voronoi tessellations. Other advisor: Edmond Boyer (Inria Grenoble). Li is now a data scientist working at Square Sense (Paris).
Georges Nader (2013-2016). Evaluating the visibility threshold for a local geometric distortion on a 3D mesh and its applications. Other advisors: Florent Dupont (Univ. Lyon )and Kai Wang (CNRS Grenoble). Georges is now a postdoc at the Singapore University of Technology and Design.
Romain Arcila (2008-2011). Mesh sequences: classification and segmentation methods. Other advisor: Florent Dupont (Univ. Lyon). Romain is now an engineer working for DCNS.
Sahar Hassan (2007-2011). Integration of a priori anatomical knowledge into geometrical models. Other advisor: Georges-Pierre Bonneau (Univ. Grenoble Alpes). Sahar is now an engineer working for KLS Logistic.

Software and data sets

Software

3DtLaplace (related paper)
CVT Generator (PhD work of Li Wang, related paper 1, related paper 2)
meshJND (PhD work of Georges Nader, related paper 1, related paper 2)

Data sets

Mesh sequences and motion capture data of dressed humans in motion (PhD work of Jinlong Yang, related paper)
Animation skeletons for various animals (related paper)

Publications

NEW: My book Geometric and Topological Mesh Feature Extraction for 3D Shape Analysis, written with Jean-Luc Mari and Gérard Subsol, is on sale here.

Books1 document

Jean-Luc Mari, Franck Hetroy-Wheeler, Gérard Subsol. Geometric and Topological Mesh Feature Extraction for 3D Shape Analysis. Wiley-ISTE, 3, pp.194, 2019, Geometric modeling and applications, Marc Daniel. ⟨hal-02361776⟩

Book sections1 document

Franck Hetroy-Wheeler, Jean-Luc Mari, Gérard Subsol. Géométrie et topologie pour les maillages 3D. Jérémie Chalopin; Pierre Guillon. Informatique Mathématique, Une photographie en 2019, CNRS Editions, 2019, 978-2-271-12611-5. ⟨hal-02058296⟩

Journal articles10 documents

Georges Nader, Kai Wang, Franck Hétroy-Wheeler, Florent Dupont. Just Noticeable Distortion Profile for Flat-Shaded 3D Mesh Surfaces. IEEE Transactions on Visualization and Computer Graphics, Institute of Electrical and Electronics Engineers, 2016, 22 (11), pp.2423-2436. ⟨10.1109/TVCG.2015.2507578⟩. ⟨hal-01242271⟩
Victoria Fernández Abrevaya, Sandeep Manandhar, Franck Hétroy-Wheeler, Stefanie Wuhrer. A 3D+t Laplace operator for temporal mesh sequences. Computers and Graphics, Elsevier, 2016, Shape Modeling International 2016, 58, pp.12-22. ⟨10.1016/j.cag.2016.05.018⟩. ⟨hal-01318763⟩
Franck Hétroy-Wheeler, Eric Casella, Dobrina Boltcheva. Segmentation of tree seedling point clouds into elementary units. International Journal of Remote Sensing, Taylor & Francis, 2016, 37 (13), pp.2881-2907. ⟨10.1080/01431161.2016.1190988⟩. ⟨hal-01285419⟩
Georges Nader, Kai Wang, Franck Hétroy-Wheeler, Florent Dupont. Visual Contrast Sensitivity and Discrimination for 3D Meshes and their Applications. Computer Graphics Forum, Wiley, 2016, 35 (7), pp.497-506. ⟨10.1111/cgf.13046⟩. ⟨hal-01376275⟩
Li Wang, Franck Hétroy-Wheeler, Edmond Boyer. A Hierarchical Approach for Regular Centroidal Voronoi Tessellations. Computer Graphics Forum, Wiley, 2016, 35 (1), pp.152-165. ⟨10.1111/cgf.12716⟩. ⟨hal-01185210⟩
Romain Arcila, Cédric Cagniart, Franck Hétroy, Edmond Boyer, Florent Dupont. Segmentation of temporal mesh sequences into rigidly moving components. Graphical Models, Elsevier, 2013, 75 (1), pp.10-22. ⟨10.1016/j.gmod.2012.10.004⟩. ⟨hal-00749302⟩
Franck Hétroy, Stéphanie Rey, Carlos Andujar, Pere Brunet, Alvar Vinacua. Mesh repair with user-friendly topology control. Computer-Aided Design, Elsevier, 2011, 43 (1), pp.101-113. ⟨10.1016/j.cad.2010.09.012⟩. ⟨inria-00523005⟩
Dobrina Boltcheva, David Canino, Sara Merino Aceituno, Jean-Claude Léon, Leila de Floriani, et al.. An iterative algorithm for homology computation on simplicial shapes. Computer-Aided Design, Elsevier, 2011, Solid and Physical Modeling 2011, 43 (11), pp.1457-1467. ⟨10.1016/j.cad.2011.08.015⟩. ⟨hal-00644410v2⟩
Ljiljana Skrba, Lionel Reveret, Franck Hétroy, Marie-Paule Cani, Carol O'Sullivan. Animating Quadrupeds: Methods and Applications. Computer Graphics Forum, Wiley, 2009, 28 (6), pp.1541-1560. ⟨10.1111/j.1467-8659.2008.01312.x⟩. ⟨inria-00365340⟩
Franck Hétroy, Dominique Attali. Topological Quadrangulations of Closed Triangulated Surfaces using the Reeb Graph. Graphical Models, Elsevier, 2003, Special issue: Discrete Topology and Geometry for Image and Object Representation, 65 (1-3), pp.131-148. ⟨inria-00001143⟩

Conference papers23 documents

Eric Casella, Romain Rombourg, Pasi Raumonen, Franck Hetroy-Wheeler, Markku Åkerblom. Sensitivity analysis of an automated processing chain and uncertainty in the prediction of tree above ground biomass from TLS data. 3D Tree Models for Forest Dynamics, Jan 2020, Helsinki, Finland. ⟨hal-02374414⟩
Jinlong Yang, Jean-Sébastien Franco, Franck Hetroy-Wheeler, Stefanie Wuhrer. Analyzing Clothing Layer Deformation Statistics of 3D Human Motions. ECCV 2018 - European Conference on Computer Vision, Sep 2018, Munich, Germany. pp.245-261, ⟨10.1007/978-3-030-01234-2_15⟩. ⟨hal-01763706v2⟩
Eric Casella, Pasi Raumonen, Romain Rombourg, Franck Hétroy-Wheeler, Helen Mckay. A comprehensive sensitivity analysis of forest tree mock-up reconstruction methods from phase-shift based tLiDAR point-cloud data. International Conference on Functional-Structural Plant Growth Modeling, Simulation, Visualization and Applications (FSPMA), Dr Xiujuan Wang, Nov 2016, Qingdao, China. ⟨hal-01399491⟩
Li Wang, Franck Hétroy-Wheeler, Edmond Boyer. On Volumetric Shape Reconstruction from Implicit Forms. ECCV 2016 - European Conference on Computer Vision, Oct 2016, Amsterdam, Netherlands. ⟨10.1007/978-3-319-46487-9_11⟩. ⟨hal-01349059⟩
Aurela Shehu, Jinlong Yang, Jean-Sébastien Franco, Franck Hétroy-Wheeler, Stefanie Wuhrer. Computing temporal alignments of human motion sequences in wide clothing using geodesic patches. 3DV 2016 - International Conference on 3D Vision 2016, Oct 2016, Stanford, United States. pp.185-193, ⟨10.1109/3DV.2016.27⟩. ⟨hal-01367791⟩
Jinlong Yang, Jean-Sébastien Franco, Franck Hétroy-Wheeler, Stefanie Wuhrer. Estimation of Human Body Shape in Motion with Wide Clothing. ECCV 2016 - European Conference on Computer Vision 2016, Oct 2016, Amsterdam, Netherlands. pp.439-454, ⟨10.1007/978-3-319-46493-0_27⟩. ⟨hal-01344795v4⟩
Georges Nader, Kai Wang, Franck Hétroy-Wheeler, Florent Dupont. Modèle Perceptuel pour la Détection du Seuil de Visibilité des Distorsions sur un Maillage 3D. 28èmes journées de l’Association Française en Informatique Graphique, Nov 2015, Lyon, France. ⟨hal-01245373⟩
Dobrina Boltcheva, Eric Casella, Rémy Cumont, Franck Hétroy. A spectral clustering approach of vegetation components for describing plant topology and geometry from terrestrial waveform LiDAR data. FSPM2013 - 7th International Conference on Functional-Structural Plant Models, Jun 2013, Saariselkä, Finland. ⟨hal-00817508⟩
Sahar Hassan, Franck Hétroy, François Faure, Olivier Palombi. Automatic localization and quantification of intracranial aneurysms. CAIP - 14th International Conference on Computer Analysis of Images and Patterns, Aug 2011, Seville, Spain. pp.554-562, ⟨10.1007/978-3-642-23672-3_67⟩. ⟨inria-00598491v2⟩
Sahar Hassan, Franck Hétroy, Olivier Palombi. Ontology-Guided Mesh Segmentation. FOCUS K3D Conference on Semantic 3D Media and Content, FOCUS K3D, Feb 2010, Sophia Antipolis, France. pp.5. ⟨inria-00450907v2⟩
Romain Arcila, Kartik Buddha, Franck Hétroy, Florence Denis, Florent Dupont. A Framework for motion-based mesh sequence segmentation. WSCG - International Conference on Computer Graphics, Visualization and Computer Vision, Feb 2010, Plzen, Czech Republic. pp.33-40. ⟨inria-00440672⟩
Jean-Claude Léon, Leila de Floriani, Franck Hétroy. Classification of non-manifold singularities from transformations of 2-manifolds. SMI 2009 - IEEE International Conference on Shape Modeling and Applications, Jun 2009, Beijing, China. pp.179-184, ⟨10.1109/SMI.2009.5170146⟩. ⟨inria-00365338v2⟩
Franck Hétroy, Cédric Gérot, Lin Lu, Boris Thibert. Simple flexible skinning based on manifold modeling. GRAPP 2009 - International Conference on Computer Graphics Theory and Applications, Feb 2009, Lisbon, Portugal. pp.259-265. ⟨inria-00339413v2⟩
Jean-Claude Léon, Franck Hétroy, Leila de Floriani. Propriétés topologiques pour la modélisation géométrique de domaines d'études comportant des singularités non-variétés. CFM'09 - 19ème Congrès Français de Mécanique, Aug 2009, Marseille, France. ⟨inria-00394387v2⟩
Sahar Hassan, Franck Hétroy, Olivier Palombi. Segmentation de maillage guidée par une ontologie. AFIG 2009 - 22e Journées de l'Association Française d'Informatique Graphique, Nov 2009, Arles, France. ⟨inria-00436610v2⟩
Romain Arcila, Franck Hétroy, Florent Dupont. État de l'art des méthodes de segmentation de séquences de maillages et proposition d'une classification. CORESA'09 - COdage et REprésentation des Signaux Audiovisuels, Mar 2009, Toulouse, France. ⟨inria-00435858⟩
Ljiljana Skrba, Lionel Reveret, Franck Hétroy, Marie-Paule Cani, Carol O'Sullivan. Quadruped Animation. Eurographics '2008 - 29th annual conference of the European Association for Computer Graphics, Apr 2008, Hersonissos, Creete, Greece. pp.7-23. ⟨inria-00331715v2⟩
Grégoire Aujay, Franck Hétroy, Francis Lazarus, Christine Depraz. Harmonic Skeleton for Realistic Character Animation. SCA '07 - ACM-SIGGRAPH/Eurographics Symposium on Computer Animation, Aug 2007, San Diego, United States. pp.151-160, ⟨10.2312/SCA/SCA07/151-160⟩. ⟨inria-00151606v2⟩
Grégoire Aujay, Franck Hétroy, Francis Lazarus. Construction automatique d'un squelette pour l'animation de personnages. 19èmes Journées de l'Association Française d'Informatique Graphique (AFIG), Nov 2006, Bordeaux, France. ⟨inria-00110047v3⟩
Franck Hétroy. Constriction Computation using Surface Curvature. Eurographics (short paper), Aug 2005, Dublin, Ireland. pp.1-4. ⟨inria-00001135v2⟩
Franck Hétroy, Dominique Attali. From a Closed Piecewise Geodesic to a Constriction on a Closed Triangulated Surface. Pacific Graphics Conference on Computer Graphics and Applications, J. Rokne, Oct 2003, Canmore, Alberta, Canada, France. pp.394-398. ⟨inria-00001145⟩
Franck Hétroy, Dominique Attali. Detection of Constrictions on Closed Polyhedral Surfaces. Eurographics/IEEE TCVG Visualisation Symposium, G.-P. Bonneau, S. Hahmann, C. Hansen, May 2003, Grenoble, France, France. pp.67-74. ⟨inria-00001144⟩
Franck Hétroy, Dominique Attali. Topological Quadrangulations of Closed Triangulated Surfaces Using the Reeb Graph. Digital Geometry for Computer Imagery (DGCI), 2002, Bordeaux, France. pp.57-68, ⟨10.1007/3-540-45986-3_5⟩. ⟨hal-02375564⟩

Poster communications1 document

Romain Rombourg, Eric Casella, Franck Hétroy-Wheeler, Helen Mckay. A point-cloud classification method to assess biases in tLiDAR-based forest canopy gap fraction estimates. International Conference on Functional-Structural Plant Growth Modeling, Simulation, Visualization and Applications (FSPMA), Nov 2016, Qingdao, China. 2016. ⟨hal-01399489⟩

Reports6 documents

Benjamin Allain, Li Wang, Jean-Sébastien Franco, Franck Hetroy-Wheeler, Edmond Boyer. Shape Animation with Combined Captured and Simulated Dynamics. [Research Report] arXiv:1601.01232, ArXiv. 2016, pp.11. ⟨hal-01255337⟩
Romain Arcila, Cédric Cagniart, Franck Hétroy, Edmond Boyer, Florent Dupont. Temporally coherent mesh sequence segmentations. [Research Report] RR-7856, INRIA. 2012, pp.20. ⟨hal-00658060v2⟩
Franck Hétroy. A discrete 3D+t Laplacian framework for mesh animation processing. [Research Report] RR-8003, INRIA. 2012, pp.20. ⟨hal-00710899⟩
Dobrina Boltcheva, Sara Merino Aceitunos, Jean-Claude Léon, Franck Hétroy. Constructive Mayer-Vietoris Algorithm: Computing the Homology of Unions of Simplicial Complexes. [Research Report] RR-7471, INRIA. 2010. ⟨inria-00542717⟩
Franck Hétroy, Stéphanie Rey, Carlos Andujar, Pere Brunet, Alvar Vinacua. Mesh Repair with Topology Control. [Research Report] RR-6535, INRIA. 2008, pp.23. ⟨inria-00279919v3⟩
Lin Lu, Franck Hétroy, Cédric Gérot, Boris Thibert. Atlas-Based Character Skinning with Automatic Mesh Decomposition. [Research Report] RR-6406 - Département Images et Signal, -; INRIA. 2008, pp.21. ⟨inria-00202597v4⟩

Habilitation à diriger des recherches1 document

Franck Hétroy-Wheeler. Segmentation and Skeleton Methods for Digital Shape Understanding. Graphics [cs.GR]. Université Grenoble Alpes, 2015. ⟨tel-01246006v2⟩