Franck Hétroy-Wheeler
49
Documents
Presentation

Position
--------
Professor in computer science at the [](http://www.en.unistra.fr/) since September 2017.
This means I am both:
- teaching at the [department of mathematics and computer science](http://www.en.unistra.fr/index.php?id=21889) of the university;
- and a researcher in the Engineering science, computer science and imaging research institute [](http://icube.unistra.fr/en/), in the [IGG](https://igg.icube.unistra.fr/) 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](https://ensimag.grenoble-inp.fr/) ([Univ. Grenoble](https://www.univ-grenoble-alpes.fr/english/), 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](https://www.virvig.eu//index.php) (2004), tenured assistant professor (*maître de conférences*) Grenoble INP - Ensimag/<a>Laboratoire Jean Kuntzmann</a> (2004-2017, [EVASION](http://evasion.imag.fr/index.gb.html) then [Morpheo](https://team.inria.fr/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](https://en.wikipedia.org/wiki/Bloom%27s_taxonomy). I strongly believe students can durably understand something only if the learning process follows the main ideas of [Jean Houssaye's **educational triangle**](https://fr.wikipedia.org/wiki/Triangle_p%C3%A9dagogique). I also like to make students **work in groups** in order to confront and increase their soft skills, e.g. following an [agile methodology](https://en.wikipedia.org/wiki/Agile_learning).
### Responsibility
- Head (with [Caroline Essert](http://icube-igg.unistra.fr/en/index.php/Caroline_Essert)) of the *[Image track of the Master Curriculum in Engineering (CMI)](http://cmi-informatique.unistra.fr/image/)* of the University of Strasbourg
### Lectures
- [Digital geometry](http://icube-igg.unistra.fr/fr/index.php/G%C3%A9om%C3%A9trie_num%C3%A9rique) *for 1st-year [master students in computer science](http://mathinfo.unistra.fr/formations/master/informatique/) (Spring 2018 to 2023)*
- Knowledge and practice of computers *for 1st-year [bachelor students in maths and computer science](http://mathinfo.unistra.fr/formations/licence/informatique/) (Spring 2019 to 2023)*
- Integrative project (organizer) for **3rd-year* **[CMI students in computer science](https://mathinfo.unistra.fr/formations/diplome-duniversite/du-cursus-master-ingenierie-cmi-informatique-image-realite-virtuelle-interactions-et-jeux/)* (Spring 2022 and 2023)**
[The computer games developed during Spring 2022 by the students in the context of this project are now part of a digital exhibition in a local museum!](https://mathinfo.unistra.fr/actualites/actualite/news/le-numerique-a-loeuvre-vivez-une-experience-immersive-au-musee-1/)
- Advanced algorithms *for 1st-year [master students in computer science](http://mathinfo.unistra.fr/formations/master/informatique/) (Autumn 2018 to 2022)*
- Data structures and algorithms *for 2nd-year [bachelor students in computer science](http://mathinfo.unistra.fr/formations/licence/informatique/) (Autumn 2017 to 2022)*
- [3D animation](https://seafile.unistra.fr/d/0ad83257df144e238e62/) **for 2nd-year* **[CMI students in computer science](https://mathinfo.unistra.fr/formations/diplome-duniversite/du-cursus-master-ingenierie-cmi-informatique-image-realite-virtuelle-interactions-et-jeux/)* (Autumn 2021 and 2022)**
- Scientific literature projects (organizer) *for 2nd-year [CMI students in computer science](https://mathinfo.unistra.fr/formations/diplome-duniversite/du-cursus-master-ingenierie-cmi-informatique-image-realite-virtuelle-interactions-et-jeux/) (Spring 2021)*
- Applied numerical analysis *for 2nd-year [bachelor students in computer science](http://mathinfo.unistra.fr/formations/licence/informatique/) (Autumn 2020)*
- University work methodologies *for 1st-year [bachelor students in maths and computer science](http://mathinfo.unistra.fr/formations/licence/informatique/) (Autumn 2018 and 2019)*
- Algorithms and programming *for 1st-year [bachelor students in maths and computer science](http://mathinfo.unistra.fr/formations/licence/informatique/) (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](https://www.canal-u.tv/video/inria/geometrie_numerique_du_reel_au_virtuel_1ere_partie.14260), [part 2](https://www.canal-u.tv/video/inria/geometrie_numerique_du_reel_au_virtuel_2eme_partie.14261)). Check also [this video](https://www.youtube.com/watch?v=jjtVhjx8-3Q) by [Eric Casella](https://www.forestresearch.gov.uk/staff/eric-casella/).
### More details (works before 2016)
- [Understanding digital shapes from the life sciences](http://morpheo.inrialpes.fr/people/hetroy/index.php?id=geo_med)
- [Digital geometry processing for shapes in motion](http://morpheo.inrialpes.fr/people/hetroy/index.php?id=geo_anim)
- [Geometric, topological and perceptual analysis of 3D meshes](http://morpheo.inrialpes.fr/people/hetroy/index.php?id=geo_other)
### Keywords
Digital geometry processing, segmentation, reconstruction, geometric and topological feature computation.
### Project
- **UrTrees** (2022-2023). MITI "Citizen science" funding from the CNRS, € 15k.
#### Past projects
- [**ROMI**](http://www.romi-project.eu/ "ROMI") (2017-2022, as a member of the Inria [MOSAIC](https://team.inria.fr/mosaic/) team). H2020 European project, € 3868k.
- **SimPFI** (PI, 2019-2021). IDEX funding from the University of Strasbourg, € 59k.
- **Crop3D** (PI, 2018-2021). [CIFRE](http://www.anrt.asso.fr/fr/cifre-7843) PhD scholarship from [ANRT](http://www.anrt.asso.fr/) with [Arvalis](https://www.arvalisinstitutduvegetal.fr/index.html).
- [**Carambole**](http://morpheo.inrialpes.fr/carambole/) (PI, 2016-2017). Exploratory grant from LabEx PERSYVAL-lab, € 9k.
- **Digitree** (PI, 2015-2018). AGIR grant from Univ. Grenoble Alpes, € 96k.
- [**ACHMOV**](http://www.agence-nationale-recherche.fr/?Project=ANR-14-CE24-0030) (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**](http://morpho.inrialpes.fr/) (2010-2015, coordinator from 2012 to 2015). ANR grant, € 482k.
- [**PlantScan3D**](https://team.inria.fr/virtualplants/research/project/plantscan3d/) (2009-2011). Grants from the Agropolis Foundation and Inria, € 118k.
- **IDEAL** (2009). BQR grant from Grenoble INP, € 40k.
- [**MADRAS**](http://www-rech.telecom-lille1.eu/madras/) (2008-2011). ANR grant, € 330k.
- **MEGA** (PI, 2006-2008). Grants from Grenoble INP, UJF and Inria, € 55k.
### Students
#### Former students
##### Postdocs
- **[Joris Ravaglia](https://www.researchgate.net/scientific-contributions/Joris-Ravaglia-2064821037)** (2019-2020). Topic: Designing a simulator for planning Terrestrial laser scanner-based forest inventories. Part of the SimPFI project. Other advisor: [Eric Casella](https://www.forestresearch.gov.uk/staff/eric-casella/) (Forest Research, UK).
- [**Dobrina Boltcheva**](https://members.loria.fr/DBoltcheva/) (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](https://team.inria.fr/imagine/jean_claude_leon/) (Grenoble INP, 2009-2010) and with [Marie-Paule Cani](https://www.lix.polytechnique.fr/geovic/members/marie-paule_cani/index.html) (Grenoble INP, 2010-2011). *Dobrina is now an associate professor at [Univ. Nancy](http://alice.loria.fr/) ([IUT Saint Dié](http://www.iutsd.uhp-nancy.fr/)).*
##### PhD students
- **Katia Mirande** (2018-2022). Semantic and instancesegmentation of plant 3D point clouds. Other advisor: [Christophe Godin](https://team.inria.fr/virtualplants/christophe-godin/) (Inria Lyon).
- **[Mélinda Boukhana](https://www.researchgate.net/profile/Melinda_Boukhana)** (2018-2021). 3D acquisition and reconstruction of crops to estimate individual leaf surfaces. Other advisor: [Benoît de Solan](https://www.researchgate.net/profile/Benoit_De_Solan) (Arvalis). *Mélinda is now an engineer working for Capgemini Engineering (Strasbourg, France).*
- **[Romain Rombourg](https://scholar.google.com/citations?user=F9qar5kAAAAJ)** (2015-2019). Terrestrial laser scanner noise analysis, modelling and detection. Other advisor: [Eric Casella](https://www.forestry.gov.uk/fr/infd-6e8b4y) (Forest Research, UK). *Romain is now a postdoc at [Grenoble INP - Ensimag ](https://ensimag.grenoble-inp.fr/en)(Grenoble, France).*
- **[Jinlong Yang](https://is.tuebingen.mpg.de/person/jyang)** (2015-2019). Learning shape spaces of dressed 3D human models in motion. Other advisor: [Stefanie Wuhrer](http://morpheo.inrialpes.fr/~wuhrer/) (Inria Grenoble). *Jinlong is now a postdoc at the [Max Planck Institute for Intelligent Systems](https://is.tuebingen.mpg.de/) (Tübingen, Germany).*
- **[Li Wang](http://morpheo.inrialpes.fr/people/wang/)** (2013-2017). Algorithms and criteria for volumetric centroidal Voronoi tessellations. Other advisor: [Edmond Boyer](http://morpheo.inrialpes.fr/people/boyer/) (Inria Grenoble). *Li is now a solution architect working for Alibaba Group (Shenzhen, China).*
- [ **Georges Nader**](https://people.sutd.edu.sg/~georges_nader/) (2013-2016). Evaluating the visibility threshold for a local geometric distortion on a 3D mesh and its applications. Other advisors: [Florent Dupont](http://liris.cnrs.fr/florent.dupont/) (Univ. Lyon 1) and [Kai Wang](http://www.gipsa-lab.grenoble-inp.fr/~kai.wang) (CNRS Grenoble). *Georges is now a research engineer working for Ubisoft (Bordeaux, France).*
- **[Romain Arcila](http://www-evasion.imag.fr/Membres/Romain.Arcila/)** (2008-2011). Mesh sequences: classification and segmentation methods. Other advisor: [Florent Dupont](http://liris.cnrs.fr/florent.dupont/index_en.shtml) (Univ. Lyon). *Romain is now an engineer working for [DCNS](http://en.dcnsgroup.com/) (Angoulême, France).*
- **[Sahar Hassan](http://evasion.imag.fr/Membres/Sahar.Hassan/)** (2007-2011). Integration of a priori anatomical knowledge into geometrical models. Other advisor: [Georges-Pierre Bonneau](http://www-evasion.inrialpes.fr/~Georges-Pierre.Bonneau/) (Univ. Grenoble Alpes). *Sahar is now an engineer working for [KLS Logistic](https://www.kls-group.fr/en) (Grenoble, France).*
### Software and data sets
#### Software
- [Plant leaf area estimation](https://gitlab.unistra.fr/plant-leaf-area-estimation-gvc-2022/) (PhD work of Mélinda Boukhana, [related paper](https://hal.inria.fr/hal-03770764))
- [4D Plant Analysis](https://github.com/romi/4d_plant_analysis) (Master work of Haolin Pan, [related paper](https://hal.inria.fr/hal-03402870))
- [3DtLaplace](http://3dtlaplace.gforge.inria.fr/) ([related paper](https://hal.inria.fr/hal-01318763))
- [CVT Generator](http://cvt.gforge.inria.fr/) (PhD work of Li Wang, [related paper 1](https://hal.inria.fr/hal-01185210), [related paper 2](https://hal.inria.fr/hal-01349059))
- [meshJND](https://github.com/gnader/meshJND) (PhD work of Georges Nader, [related paper 1](https://hal.science/hal-01242271), [related paper 2](https://hal.inria.fr/hal-01376275))
#### Data sets
- [Chenopodium album](https://zenodo.org/record/6962994#.YuvYkS8itqs) dataset (PhD work of Katia Mirande, acquisitions by Marie Tisserand, Julie Charlaix and Fabrice Besnard, [related paper](https://hal.inria.fr/hal-03797682))
- [Arabidopsis 3D+t](https://zenodo.org/record/5205562#%23.YVsD_9ozaUk) dataset (Master work of Haolin Pan, acquisitions by Julie Charlaix, [related paper](https://hal.inria.fr/hal-03402870))
- Mesh sequences and motion capture data of [dressed humans in motion](https://team.inria.fr/morpheo/estimation-of-human-body-shape-in-motion-with-wide-clothing/) (PhD work of Jinlong Yang, [related paper](https://hal.inria.fr/hal-01344795))
- [Animation skeletons](http://evasion.imag.fr/Membres/Franck.Hetroy/Projects/Skeleton/gallery.html) for various animals ([related paper](https://hal.inria.fr/inria-00151606))
### Publications
Publications
Geometric and Topological Mesh Feature Extraction for 3D Shape AnalysisWiley-ISTE, 3, pp.194, 2019, Geometric modeling and applications, Marc Daniel
Books
hal-02361776v1
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Géométrie et topologie pour les maillages 3DJérémie Chalopin; Pierre Guillon. Informatique Mathématique, Une photographie en 2019, CNRS Editions, 2019, 978-2-271-12611-5
Book sections
hal-02058296v1
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Multi-scale Space-time Registration of Growing PlantsThe 9th International Conference on 3D Vision (3DV), Dec 2021, Londres, United Kingdom
Conference papers
hal-03402870v1
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High-precision 3D segmentation of plants combining spectral clustering and quotient graph techniques: a multi-level approach9th International Conference on Functional-Structural Plant Models, 2020, En ligne, France
Conference papers
hal-03245673v1
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Geometric models for plant leaf area estimation from 3D point clouds: a comparative studyJournées Françaises d'Informatique Graphique, Nov 2020, Nancy, France
Conference papers
hal-03256446v1
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Sensitivity analysis of an automated processing chain and uncertainty in the prediction of tree above ground biomass from TLS data3D Tree Models for Forest Dynamics, Jan 2020, Helsinki, Finland
Conference papers
hal-02374414v1
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Analyzing Clothing Layer Deformation Statistics of 3D Human MotionsECCV 2018 - European Conference on Computer Vision, Sep 2018, Munich, Germany. pp.245-261, ⟨10.1007/978-3-030-01234-2_15⟩
Conference papers
hal-01763706v2
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Estimation of Human Body Shape in Motion with Wide ClothingECCV 2016 - European Conference on Computer Vision 2016, Oct 2016, Amsterdam, Netherlands. pp.439-454, ⟨10.1007/978-3-319-46493-0_27⟩
Conference papers
hal-01344795v4
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Computing temporal alignments of human motion sequences in wide clothing using geodesic patches3DV 2016 - International Conference on 3D Vision 2016, Oct 2016, Stanford, United States. pp.185-193, ⟨10.1109/3DV.2016.27⟩
Conference papers
hal-01367791v1
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On Volumetric Shape Reconstruction from Implicit FormsECCV 2016 - European Conference on Computer Vision, Oct 2016, Amsterdam, Netherlands. ⟨10.1007/978-3-319-46487-9_11⟩
Conference papers
hal-01349059v1
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A comprehensive sensitivity analysis of forest tree mock-up reconstruction methods from phase-shift based tLiDAR point-cloud dataInternational Conference on Functional-Structural Plant Growth Modeling, Simulation, Visualization and Applications (FSPMA), Dr Xiujuan Wang, Nov 2016, Qingdao, China
Conference papers
hal-01399491v1
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Modèle Perceptuel pour la Détection du Seuil de Visibilité des Distorsions sur un Maillage 3D28èmes journées de l’Association Française en Informatique Graphique, Nov 2015, Lyon, France
Conference papers
hal-01245373v1
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A spectral clustering approach of vegetation components for describing plant topology and geometry from terrestrial waveform LiDAR dataFSPM2013 - 7th International Conference on Functional-Structural Plant Models, Jun 2013, Saariselkä, Finland
Conference papers
hal-00817508v1
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Automatic localization and quantification of intracranial aneurysmsCAIP - 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⟩
Conference papers
inria-00598491v2
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A Framework for motion-based mesh sequence segmentationWSCG - International Conference on Computer Graphics, Visualization and Computer Vision, Feb 2010, Plzen, Czech Republic. pp.33-40
Conference papers
inria-00440672v1
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Ontology-Guided Mesh SegmentationFOCUS K3D Conference on Semantic 3D Media and Content, FOCUS K3D, Feb 2010, Sophia Antipolis, France. pp.5
Conference papers
inria-00450907v2
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Segmentation de maillage guidée par une ontologieAFIG 2009 - 22e Journées de l'Association Française d'Informatique Graphique, Nov 2009, Arles, France
Conference papers
inria-00436610v2
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Simple flexible skinning based on manifold modelingGRAPP 2009 - International Conference on Computer Graphics Theory and Applications, Feb 2009, Lisbonne, Portugal. pp.259-265
Conference papers
inria-00339413v2
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État de l'art des méthodes de segmentation de séquences de maillages et proposition d'une classificationCORESA'09 - COdage et REprésentation des Signaux Audiovisuels, Mar 2009, Toulouse, France
Conference papers
inria-00435858v1
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Propriétés topologiques pour la modélisation géométrique de domaines d'études comportant des singularités non-variétésCFM 2009 - 19ème Congrès Français de Mécanique, Aug 2009, Marseille, France
Conference papers
hal-03391279v3
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Classification of non-manifold singularities from transformations of 2-manifoldsSMI 2009 - IEEE International Conference on Shape Modeling and Applications, Jun 2009, Beijing, China. pp.179-184, ⟨10.1109/SMI.2009.5170146⟩
Conference papers
inria-00365338v2
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Quadruped AnimationEurographics '2008 - 29th annual conference of the European Association for Computer Graphics, Apr 2008, Hersonissos, Creete, Greece. pp.7-23
Conference papers
inria-00331715v2
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Harmonic Skeleton for Realistic Character AnimationSCA 2007 - ACM-SIGGRAPH/Eurographics Symposium on Computer Animation, Aug 2007, San Diego, Californie, United States. pp.151-160, ⟨10.2312/SCA/SCA07/151-160⟩
Conference papers
inria-00151606v2
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Construction automatique d'un squelette pour l'animation de personnages19èmes Journées de l'Association Française d'Informatique Graphique (AFIG), Nov 2006, Bordeaux, France
Conference papers
inria-00110047v3
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Constriction Computation using Surface CurvatureEurographics (short paper), Aug 2005, Dublin, Ireland. pp.1-4
Conference papers
inria-00001135v2
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Detection of Constrictions on Closed Polyhedral SurfacesEurographics/IEEE TCVG Visualisation Symposium, G.-P. Bonneau, S. Hahmann, C. Hansen, May 2003, Grenoble, France, France. pp.67-74
Conference papers
inria-00001144v1
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From a Closed Piecewise Geodesic to a Constriction on a Closed Triangulated SurfacePacific Graphics Conference on Computer Graphics and Applications, J. Rokne, Oct 2003, Canmore, Alberta, Canada, France. pp.394-398
Conference papers
inria-00001145v1
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Topological Quadrangulations of Closed Triangulated Surfaces Using the Reeb GraphDigital Geometry for Computer Imagery (DGCI), 2002, Bordeaux, France. pp.57-68, ⟨10.1007/3-540-45986-3_5⟩
Conference papers
hal-02375564v1
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A point-cloud classification method to assess biases in tLiDAR-based forest canopy gap fraction estimatesInternational Conference on Functional-Structural Plant Growth Modeling, Simulation, Visualization and Applications (FSPMA), Nov 2016, Qingdao, China. 2016
Conference poster
hal-01399489v1
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Shape Animation with Combined Captured and Simulated Dynamics[Research Report] arXiv:1601.01232, ArXiv. 2016, pp.11
Reports
hal-01255337v1
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Temporally coherent mesh sequence segmentations[Research Report] RR-7856, INRIA. 2012, pp.20
Reports
hal-00658060v2
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A discrete 3D+t Laplacian framework for mesh animation processing[Research Report] RR-8003, INRIA. 2012, pp.20
Reports
hal-00710899v1
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Constructive Mayer-Vietoris Algorithm: Computing the Homology of Unions of Simplicial Complexes[Research Report] RR-7471, INRIA. 2010
Reports
inria-00542717v1
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Atlas-Based Character Skinning with Automatic Mesh Decomposition[Research Report] RR-6406 - Département Images et Signal, -; INRIA. 2008, pp.21
Reports
inria-00202597v4
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Mesh Repair with Topology Control[Research Report] RR-6535, INRIA. 2008, pp.23
Reports
inria-00279919v3
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Segmentation and Skeleton Methods for Digital Shape UnderstandingGraphics [cs.GR]. Université Grenoble Alpes, 2015
Habilitation à diriger des recherches
tel-01246006v2
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