Jacques-Olivier Lachaud Professeur d'Informatique / Professor in Computer Science Université de Savoie, UFR SFA LIMD team, Laboratoire de Mathématiques (LAMA, UMR CNRS 5127) . Responsable du GT Géométrie Discrète du GDR IM / Chair of Digital Geometry Working Group of GDR IM Mail address : Laboratoire de Mathématiques, UMR CNRS 5127 UFR SFA, campus scientifique 73776 Le-Bourget-du-Lac Cedex, France Phone (LAMA): +33-(0)4-79-75-86-42 Fax (LAMA): +33-(0)4-79-75-81-42 e-mail: jacques-olivier.lachaud _SPAM_AT_ univ-savoie.fr

News | Publications | Research | Projects | Demos | Teaching | Talks | Miscellaneous

News

• Next Journées du GT Géométrie discrète will take place in Lyon, November 25, 2015, organized by LIRIS laboratory, and is co-localized with AFIG2015. Contacts: D. Coeurjolly and T. Roussillon.
• A Cross-border meeting on discrete, computational geometries and applications will take place in Chambery, November 9, 2015, organized by LAMA laboratory. Contacts: J.-O. Lachaud and X. Provençal.

Publications

• CV / resume (in french, PDF)
• recent publications [ Short version | Long version with abstract ]
• list of publications [ HTML ]
• Habilitation à Diriger des Recherches (HDR), Dec 6, 2006 [ Mémoire / Manuscript (in french, gzipped PS) | Soutenance / Defence slides (in french, PDF) ]
• Thèse / PhD thesis, Jul 9, 1998 [ Mémoire / Manuscript (in french, gzipped PS) ]
• Thèses en cours / Current advised PhD thesis
  • Marion Foare,
  Analyse anisotropique des images par méthodes géométriques et variationnelles / anisotropic analysis of images with geometric and variational methods (avec D. Bucur (LIRIS))
  • Louis Cuel,
  Inférence géométrique discrète / discrete geometric inference (avec B. Thibert (LJK))
  • Jérémy Levallois,
  Convergence multi-grille et stabilité des estimateurs géométriques discrets / Multigrid convergence and stability of digital geometric estimators (avec D. Coeurjolly (LIRIS))
• Thèses encadrées / advised PhD thesis
  • Mouhammad Said, Nov 29, 2010 [ Mémoire / Manuscript (in french, PDF) ]
  Géométrie multi-résolution des objets discrets bruités, (avec F. Feschet (ISIT)).
  • François de Vieilleville, Jul. 6, 2007 [ Mémoire / Manuscript (in french, PDF) ]
  Analyse des parties linéaires des objets discrets et estimateurs de caractéristiques géométriques.
  • Sylvie Alayrangues, Jul. 8, 2005 [ Mémoire / Manuscript (in french, gzipped PS) ]
  Modèles et Invariants Topologiques en Imagerie Numérique.
  • Benjamin Taton, Oct. 14, 2004 [ Mémoire / Manuscript (in french, PDF 44Mb) ]
  Modèle déformable à densité adaptative : Application à la segmentation d'images.

Research interests

• Adaptive deformable models
  [ Lachaud05b , Lachaud04a , Lachaud03d , Taton02b ]
• Discrete geometry
  [ deVieilleville09a , Brlek09a , Kerautret09a , Kerautret08c , Kerautret08b , Brlek08a , Kerautret08a , deVieilleville08a , Lachaud07a , deVieilleville07a , deVieilleville06b , Braure06a , deVieilleville06a , deVieilleville05a , Lachaud05a , Lachaud03c , Lachaud01a ]
• Digital surfaces and singular surfaces
  [ Lachaud07b , Lachaud03c , Lachaud03b ]
• Digital topology and isosurfaces
  [ Lachaud00a , Lachaud98a , Lachaud96b ]
• Deformable models for image analysis
  [ Lachaud99a , Lachaud98b , Lachaud96a , Lachaud96c , Lachaud96d , Lachaud95 , Lachaud94 ]
• Isosurfaces and Delaunay triangulation
• Combinatorial topology and invariants

Funded scientific projects

• ANR CoMeDiC (10/2015-9/2019). Convergent Metrics for Digital Calculus. [ Project main page ] (Principal Investigator).
• ANR DigitalSnow (9/2011-8/2015). Discrete Geometry and Applied Mathematics for Snow Metamorphism. [ Project main page ] (LAMA coordinator).
• ANR KIDICO (12/2010-11/2014). [ Project main page ] (Member).
• ANR GeoDIB (9/2006-4/2011). Geometry of digital noisy objects. [ Project main page ] (LaBRI/LAMA coordinator).
• ANR FOGRIMMI (1/2007-12/2010). Mining huge microscopic images. [ Project main page ] (LaBRI/LAMA coordinator).

• DGtal. Digital geometry tools and algorithms. [ main page ] [ Collaborative forge ]
• ImaGene. Generic digital image library. [ Forge main page ] [ On-line user and reference manual ]

On-line demos

• On-line demo for PAMI2012 paper Give any digital contour or upload an image and it will return the local noise level of your data (On-line demo made by B. Kerautret, LORIA, Nancy).
• On-line demo for ICPRAM2011 paper Give any polygonal contour or upload an image and it will return the local noise level of your data (On-line demo made by B. Kerautret, LORIA, Nancy).

Teaching

• New ressources for my students (INFO510, INFO511, INFO625, INFO735, INFO803, INFO006): go to the LAMA wiki (mail me if you forgot the link).
• I teach (or taught): image analysis, imperative languages (C), generic and object-oriented programming (C++, JAVA), object-oriented analysis and design with UML, algorithmic and data structures, cryptography and security.

Invited talks and seminars

• Invited talk, Meeting on Tomography and Applications, Milano, Italy, May 6 - 8, 2019.
  Digital convexity and digital planarity, global and local perspectives [ Slides PDF (15.6Mb) ]
• Invited talk, Workshop Phase-field models of fracture, Banff International Research Station, Alberta, March 3 - 8, 2019.
  Discrete calculus model of Ambrosio-Tortorelli's functional [ Slides PDF (15.6Mb) ]
• Seminar, Meeting of DigitalSnow project, Autrans, France, July 8 - 9, 2015.
  Properties of Gauss digitized shapes and digital surface integration [ Slides PDF (3.5Mb) ]
• Seminar, Meeting of KIDICO project, Obernai, France, June 29 - July 3, 2015.
  Properties of Gauss digitized shapes and digital surface integration [ Slides PDF (3.5Mb) ]
• Invited Talk, Colloquium on Discrete Curvature, CIRM, Luminy, November 18-22, 2013.
  Multigrid convergence of digital curvature estimators [ Slides PDF (8Mb) ]
• Public conference, Galerie Eurêka, Chambéry. October 13, 2013.
  Imagerie 3D et mathématiques [ Slides PDF (19Mb, in french) ]
• Poster, Workshop SIGMA'2012, CIRM, Marseille. November 19-23, 2012.
  Asymptotic linear digital geometry and applications [ Poster PDF ]
• Seminar, Journées du GT ARITH (RAIM), Perpignan. February 8, 2011.
  Asymptotic linear digital geometry and applications [ slides PDF ]
• Seminar, Workshop DGCV (Digital Geometry and Computer Vision), Marne-la-Vallée. September 24, 2010.
  Digital shape analysis with maximal segments [ slides PDF ]
• Seminar, GeoDIB meeting, Aussois. June 29, 2010. With M. Said.
  Multiscale Discrete Geometry II (top-down and bottom-up) [ slides PDF ]
• Seminar, Gipsa-Lab / Total, Grenoble. April 28, 2010. In french.
  Surfaces en géométrie riemannienne et discrète [ slides PDF ]
• Lecture, Ecole Jeunes Chercheurs du GDR IM, Chambery. April 1, 2010. In french.
  Géométrie discrète linéaire asymptotique et applications [ slides PDF ]
• Seminar, AERES evaluation, Chambery. February 4, 2010. In french.
  Géométrie discrète linéaire asymptotique et applications (version courte) [ slides PDF ]
• Seminar, Preparation meeting for ANR project DigitalSnow, LIRIS, Lyon. December 3, 2009. In french.
  Surfaces en géométrie riemannienne et discrète, estimateurs géométriques, modèles déformables discrets [ slides PDF ]
• Seminar, GEODIB project, Paris. April 24, 2009. With M. Said.
  Multi-scale discrete geometry [ Slides PDF ]
• Seminar, Working Group in Discrete Geometry, LAMA, Chambéry. March 10, 2008. In french.
  Convexité discrète et combinatoire des mots [ slides PDF ]
• Seminar, Geometry team, LAMA, Chambéry. April 4th, 2008.
  Digital topology and applications [ slides PDF ]
• Presentation, journée de l'ANR GeoDIB, LIRIS, Lyon. December 21st, 2006. In french.
  Estimateur discret de courbures par minimisation [ slides PDF ]
• Invited talk, CEREMADE, Paris. October 23rd, 2006. In french.
  Modèles déformables en espaces riemanniens et discrets [ slides PDF ]
• Invited talk, GT ARITH, LIRMM, Montpellier. March 16th, 2006. In french.
  Polygones convexes discrets, segments maximaux et convergence d'estimateurs géométriques discrets [ slides PDF ] [ Abstract (txt) ]
• Invited talk, Journée GdR ISIS / MSVC, ENST, Paris. June 9th, 2005. In french.
  Modèle déformable de complexité indépendante de la résolution image [ slides PDF ]
• Invited lecture, Ecole Jeunes Chercheurs, LIRMM laboratory, Montpellier. April 4th, 2005. In french.
  Surfaces discrètes : définition, extraction et géométrie [ slides PDF | article PDF ]
• Invited talk, GREYC laboratory, Caen. February 24th, 2005. In french.
  Modèles déformables, surfaces, et estimateurs géométriques discrets [ slides PDF ]
• Invited talk, LIS laboratory, Grenoble. January 26th, 2004.
  Deformable models with adaptive mesh and automated topology changes [ slides PDF ]
• Seminar, Journée de l'AS Géométrie discrète, LIS laboratory, Grenoble. October 16th, 2003. In french.
  Mesures géométriques sur des surfaces nD [ slides PDF ]
• Seminar, Journée de l'AS Géométrie discrète, SIC laboratory, Poitiers. July 9th, 2003. In french.
  Calcul des groupes d'homologie d'objets discrets [ slides Powerpoint ]
• Invited talk, SIC laboratory, Poitiers. June 13th, 2002. In french.
  Equivalence entre les représentations d'images à l'aide de complexes et d'ordres. [ slides Powerpoint ]
• Invited talk, ERIC laboratory, Lyon. November 26th, 2001. In french.
  Modèles hautement déformables pour la segmentation / reconstruction d'images : approche discrète. [ slides PS | article PS ]

Last update: mai 14, 2019