1. Journée Doctorants & Co
Session Poster
Présentations
Giap Nguyen, Phuong Lai, Tuan Nguyen, Cyril Faucher, Nathalie Girard
24/11/11
Journée Doctorants & Co

2. Space-filling curves and applications in image processing
Giap Nguyen (3rd year)
University ScholarShip:
, IFI, Hanoi, Vietnam
master in computer science
, University of Dalat, Vietnam
bachelor in mathematics
PhD Supervisor(s):
Patrick Franco
Jean-Marc Ogier
Rémy Mullot
Funding:
Regional allocation (Poitou-Charentes)
24/11/11
Journée Doctorants & Co

3. Space-filling curves and applications in image processing
Research field :
Space-filling curves
Applications in relation to image processing
PhD Objectives :
Multidimensionnal extension of space-filling curves
Space filling curves generating
Space filling curve optimization
24/11/11
Giap Nguyen - Journée Doctorants & Co

4. Space-filling curves and applications in image processing
Approach and techniques:
We propose a multidimensional extension of the Hilbert curve, which offers a large family of curve. This proposal is guided by the locality preserving maximization.
A curve building process is provided to exceed the cases of few dimensions.
24/11/11
Giap Nguyen - Journée Doctorants & Co

5. Space-filling curves and applications in image processing
Other information:
Comparative experimental tests show that there are some curves that preserve the locality better than the Hilbert curve (which is considered to be the best locality preserving curve) and in general, the locality preserving of the family is comparable to that of the Hilbert curve.
24/11/11
Giap Nguyen - Journée Doctorants & Co

6. Journée Doctorants & Co
Towards an interactive index structuring system for contents retrieval in huge image databases
Hien Phuong Lai (3rd year)
University ScholarShip:
PhD Supervisor(s):
Muriel VISANI (L3I)
Alain BOUCHER (IFI, Hanoi)
Jean-Marc OGIER (L3I)
Funding:
Allocation of the French Ministry
24/11/11
Journée Doctorants & Co

7. Phuong Lai - Journée Doctorants & Co
Towards an interactive index structuring system for contents retrieval in huge image databases
Research field :
CBIR, unsupervised and semi-supervised clustering
Large image database
Interactive system
PhD Objectives :
Involve the user in the clustering phase in order to reduce the semantic gap between the high-level semantic concepts expressed by the user and the low-level features.
24/11/11
Phuong Lai - Journée Doctorants & Co

8. Phuong Lai - Journée Doctorants & Co
Towards an interactive index structuring system for contents retrieval in huge image databases
Approach and techniques: Interactive semi-supervised clustering model using HMRF-Kmeans clustering method.
The initial clustering is unsupervised, using k-means
Repeat:
The user gives relevance feedbacks, the system deducts them into the pairwise constraints (must-link and cannot-link) between images.
HMRF-Kmeans method is used to re-clustering in order to minimize the sum of distances between the images and the corresponding cluster centers and also the penalties of violated constraints.
24/11/11
Phuong Lai - Journée Doctorants & Co

9. Phuong Lai - Journée Doctorants & Co
Towards an interactive index structuring system for contents retrieval in huge image databases
24/11/11
Phuong Lai - Journée Doctorants & Co

10. Journée Doctorants & Co
Other information:
In order to automatically realize the interactive tests, we implement an user agent that simulates the behaviors of the user when interacting with the system.
Currently, we are involving the BIRCH clustering method in our interactive model.
24/11/11
Journée Doctorants & Co

11. Journée Doctorants & Co
Simulation platform for decision support Application to the regulation of urban transportation system
Quoc Tuan Nguyen (3rd year)
University ScholarShip:
Hanoi University of Science and
Technology
PhD Supervisor(s):
Pascal ESTRAILLIER
Alain BOUJU
Funding:
24/11/11
Journée Doctorants & Co

12. Quoc Tuan Nguyen - Journée Doctorants & Co
Simulation platform for decision support Application to the regulation of urban transportation system
Research field :
Modeling & Simulation
Urban transportation system
PhD Objectives :
Design a simulator for decision support
Theoretical framework of modeling
Architecture of a software environment that supports the configuration and the adaptive regulation
Develop for transportation systems
Modeling of transport infrastructure
Simulation of user behavior
Analyze the impacts of regulation strategies
24/11/11
Quoc Tuan Nguyen - Journée Doctorants & Co

13. Quoc Tuan Nguyen - Journée Doctorants & Co
Simulation platform for decision support Application to the regulation of urban transportation system
Approach and techniques:
Paradigm of Multi-Agent System
Systems of Systems
24/11/11
Quoc Tuan Nguyen - Journée Doctorants & Co

14. Joint and consistent representation of knowledge by object models
Cyril Faucher (3rd year)
University ScholarShip:
From 2003 to 2009, Software Engineer in
different laboratories (CNRS, INRIA, L3i)
2003, DESS ISI, La Rochelle (Master 2 in Computer Science)
PhD Supervisor(s):
Jean-Yves Lafaye
Frédéric Bertrand
Funding:
RelaxMultiMedias 2, ANR project (French National Research Agency)
24/11/11
Journée Doctorants & Co

15. Joint and consistent representation of knowledge by object models
Research field :
Software Engineering
Temporal Events
PhD Objectives :
Modeling periodicity for temporal events
Verifying temporal expressions consistency
« each 8th day of each Week »
« each 8th day of each Month »
24/11/11
Cyril Faucher - Journée Doctorants & Co

16. Joint and consistent representation of knowledge by object models
Approach and techniques:
Model Driven Engineering
Grammar
Constraint Programming
Temporal logics
Extension of Allen's Temporal Logics
Web, iCalendar
24/11/11
Cyril Faucher - Journée Doctorants & Co

17. Joint and consistent representation of knowledge by object models
Other informations:
Summer school
Further national conferences (+ GDR)
1 international workshop
1 international conference
1 international journal
24/11/11
Cyril Faucher - Journée Doctorants & Co

18. Journée Doctorants & Co
Towards a hybrid approach mixing classification trees and Galois lattices for images indexing
Nathalie Girard (4th year)
University ScholarShip :
From 2001 to 2008, DEUG, Bachelor and Master in La Rochelle
Mathematics
Computer Science
PhD Supervisor(s) :
Karell Bertet
Muriel Visani
Funding :
Allocation of the French Ministry
24/11/11
Journée Doctorants & Co

19. Research field : PhD Objectives :
Towards a hybrid approach mixing classification trees and Galois lattices for images indexing
Research field :
Classification models => Symbolic models
Numerical data => Images’ Representation
PhD Objectives :
Comparative study of decision trees (DT) and the Galois lattices (GL)
Development of an hybrid model combining the advantages of DT & GL:
readability (DT & GL)
robustness (GL)
low memory (DT).
This model should be adapted to the problems of images' classification
24/11/11
Nathalie Girard - Journée Doctorants & Co

20. => According to existing pruning: adaptation of pruning for GL
Towards a hybrid approach mixing classification trees and Galois lattices for images indexing
Approach and techniques:
According to a binary dataset:
 DT  GL
DT deals with numerical data using discretization
Local discretization improves DT performances
=> According to lattice theory: definition of local discretization for GL
DT uses a pruning process to be smaller
There exists GL pruning process: stability; filtering
=> According to existing pruning: adaptation of pruning for GL
24/11/11
Nathalie Girard - Journée Doctorants & Co

21. Nathalie Girard - Journée Doctorants & Co
Towards a hybrid approach mixing classification trees and Galois lattices for images indexing
Other information:
3 international conferences:
ICTAI 2011, CLA 2011, CLA 2008
1 French journal:
Traitement du Signal
2 international workshops:
GREC 2009, GREC 2007
1 national conference:
SFC 2009 (+ GDR)
1 Summer school:
éEGC 2010
Participation in the organization of GREC 2009 in La Rochelle
24/11/11
Nathalie Girard - Journée Doctorants & Co