Laboratoire Dinformatique Fondamentale Of Lille

Villeneuve-la-Rivière, France

Laboratoire Dinformatique Fondamentale Of Lille

Villeneuve-la-Rivière, France
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Ballihi L.,Laboratoire Dinformatique Fondamentale Of Lille | Ballihi L.,Mohammed V University | Ben Amor B.,Telecom Lille 1 | Daoudi M.,Telecom Lille 1 | And 2 more authors.
IEEE Transactions on Information Forensics and Security | Year: 2012

We utilize ideas from two growing but disparate ideas in computer visionshape analysis using tools from differential geometry and feature selection using machine learningto select and highlight salient geometrical facial features that contribute most in 3-D face recognition and gender classification. First, a large set of geometries curve features are extracted using level sets (circular curves) and streamlines (radial curves) of the Euclidean distance functions of the facial surface; together they approximate facial surfaces with arbitrarily high accuracy. Then, we use the well-known Adaboost algorithm for feature selection from this large set and derive a composite classifier that achieves high performance with a minimal set of features. This greatly reduced set, consisting of some level curves on the nose and some radial curves in the forehead and cheeks regions, provides a very compact signature of a 3-D face and a fast classification algorithm for face recognition and gender selection. It is also efficient in terms of data storage and transmission costs. Experimental results, carried out using the FRGCv2 dataset, yield a rank-1 face recognition rate of 98% and a gender classification rate of 86% rate. © 2012 IEEE.


Martinet J.,Laboratoire Dinformatique Fondamentale Of Lille | Chiaramella Y.,Laboratoire Dinformatique Of Grenoble | Mulhem P.,Laboratoire Dinformatique Of Grenoble
Information Processing and Management | Year: 2011

In this paper, we lay out a relational approach for indexing and retrieving photographs from a collection. The increase of digital image acquisition devices, combined with the growth of the World Wide Web, requires the development of information retrieval (IR) models and systems that provide fast access to images searched by users in databases. The aim of our work is to develop an IR model suited to images, integrating rich semantics for representing this visual data and user queries, which can also be applied to large corpora. Our proposal merges the vector space model of IR - widely tested in textual IR - with the conceptual graph (CG) formalism, based on the use of star graphs (i.e. elementary CGs made up of a single relation connected to some concepts representing image objects). A novel weighting scheme for star graphs, based on image objects size, position, and image heterogeneity is outlined. We show that integrating relations into the vector space model through star graphs increases the system's precision, and that the results are comparable to those from graph projection systems, and also that they shorten processing time for user queries. © 2010 Elsevier Ltd. All rights reserved.


Morge M.,Laboratoire Dinformatique Fondamentale Of Lille | Picard G.,Ecole Nationale Superieure des Mines de Saint - Etienne CMP
Advances in Intelligent and Soft Computing | Year: 2011

The assignment problem has a wide variety of applications and in particular, it can be applied to any two-sided market. In this paper, we propose a multi-agent framework to distributively solve this kind of assignment problems, by providing agents which negotiate with respect to their preferences. We present here a realisation of the minimal concession strategy. Our realisation of the minimal concession strategy has useful properties: it preserves the privacy and improves the optimality of the solution and the equity amongst the partners. © 2011 Springer-Verlag Berlin Heidelberg.


Pentiuc St.Gh.,Laboratoire Dinformatique Fondamentale Of Lille | Craciun E.G.,Laboratoire Dinformatique Fondamentale Of Lille | Grisoni L.,Stefan Cel Mare University of Suceava
Elektronika ir Elektrotechnika | Year: 2012

The main contribution of the paper is the concept, design and experimentation of an interface able to satisfy all the main function that the user needs to interact with VR environments. The interface was aimed to supply an unified gestural paradigm. It deals with video acquisition, image processing, features extraction and pattern classification. The results of the experiments with the posture and gesture recognizing application validated our approach. Ill. 3, bibl. 14 (in English; abstracts in English and Lithuanian).


Sassi H.,Laboratoire Dinformatique Fondamentale Of Lille | Rouillard J.,Laboratoire Dinformatique Fondamentale Of Lille
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2013

Our research is at the crossroads of two main complementary areas: agents for intelligent systems and human-computer interactions. The prospect of highly natural interfaces, in which interaction between user and computer is mediated by lifelike agents, is currently one of the major steps leading to the acceptance of relevant and practical agents system by people. In this paper we illustrate our approach which takes into account both the evolution of the user interface technology and the emergence of ubiquitous computing in order to propose a proactive adaptive assistance through an agent named X-CAMPUS (eXtensible Conversational Agent for Multichannel Proactive Ubiquitous Services). It aims to assist proactively user in her daily tasks thanks to its ability to perceive the state of the environment and to communicate effectively according to the user's current situation. © 2013 Springer-Verlag Berlin Heidelberg.


Nongaillard A.,Laboratoire Dinformatique Fondamentale Of Lille | Mathieu P.,Laboratoire Dinformatique Fondamentale Of Lille | Everaere P.,Laboratoire Dinformatique Fondamentale Of Lille
Revue d'Intelligence Artificielle | Year: 2011

Solving the allocation of m resources between n agents is a problem which has been mainly studied in a centralized way. However, some welfare functions cannot be addressed by such approaches. The Nash welfare, which has interesting qualities cannot be solved in such a way. Moreover, many real problems rely on aspects that cannot be handled by centralized techniques whereas multiagent methods are efficient. After having presented the multiagent allocation problem, we show the difficulties of centralized and distributed approaches. We propose a solving method based on social transactions and we claim that our anytime solving method is the only one able to effectively address this problem of obvious practical interests. © 2011 Lavoisier, Paris.


Aissaoui A.,Laboratoire Dinformatique Fondamentale Of Lille | Martinet J.,Laboratoire Dinformatique Fondamentale Of Lille | Djeraba C.,Laboratoire Dinformatique Fondamentale Of Lille
Multimedia Tools and Applications | Year: 2013

In this paper, we introduce a novel approach for face depth estimation in a passive stereo vision system. Our approach is based on rapid generation of facial disparity maps, requiring neither expensive devices nor generic face models. It consists in incorporating face properties into the disparity estimation process to enhance the 3D face reconstruction. We propose a model-based method that is independent from the specific stereo algorithm used. Our method is a two-step process. First, an algorithm based on the Active Shape Model (ASM) is proposed to acquire a disparity model specific to the face concerned. Second, using this model as a guidance, the dense disparity is calculated and the depth map is estimated. Besides, an original post-processing algorithm is proposed in order to detect holes and spikes in the generated depth maps caused by wrong matches and uncertainties. It is based on the smoothness property of the face and a local and global analysis of the image. Experimental results are presented to demonstrate the reconstruction accuracy and the speed of the proposed method. © 2013 Springer Science+Business Media New York.


Delecroix F.,Laboratoire Dinformatique Fondamentale Of Lille | Morge M.,Laboratoire Dinformatique Fondamentale Of Lille | Routier J.-C.,Laboratoire Dinformatique Fondamentale Of Lille
Advances in Intelligent and Soft Computing | Year: 2012

In this demonstration, we bring the online selling process closer to the customer experience in a retailing store. For this purpose, we demonstrate a virtual selling agent that is proactive and adaptive. Our proactive dialogical agent initiates the dialogue and drives the inquiring process for collecting information in order to make relevant proposals. Moreover, we will see that our virtual seller is adaptive since she is able to adjust her behaviour according to the buyer profile. © 2012 Springer-Verlag Berlin Heidelberg.


Delecroix F.,Laboratoire Dinformatique Fondamentale Of Lille | Morge M.,Laboratoire Dinformatique Fondamentale Of Lille | Routier J.-C.,Laboratoire Dinformatique Fondamentale Of Lille
Advances in Intelligent and Soft Computing | Year: 2012

In this paper, we claim that the online selling process can be improved if the experience of the customer is closer to the one in a retailing store. For this purpose, we aim at providing a virtual selling agent that is proactive and adaptive. Our proactive dialogical agent initiates the dialogue, uses marketing strategies and drives the inquiring process for collecting information in order to make relevant proposals. Moreover, our virtual seller is adaptive since she is able to adjust her behaviour according to the buyer profile. © 2012 Springer-Verlag Berlin Heidelberg.


Craciun E.-G.,Stefan Cel Mare University of Suceava | Grisoni L.,Laboratoire Dinformatique Fondamentale Of Lille | Pentiuc S.-G.,Stefan Cel Mare University of Suceava | Rusu I.,Stefan Cel Mare University of Suceava
Advances in Electrical and Computer Engineering | Year: 2013

The objective of this paper is to propose a new interface based on human gestures for simulation of assembly operation inside virtual environments. Using as a guide the current context for assembly simulation, we have analyzed the existing techniques used in developing gesture-based interface and extracted the constituent elements for an assembly gesture interface. The interface we propose offers support for assembly/disassembly operation, replace or delete components inside a virtual scene. To improve the current practice in virtual assembly simulation, our interface is an efficient method for assembly operations and a competitive approach for the current assembly simulation techniques. © 2013 AECE.

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