Morocco
Morocco

Time filter

Source Type

Aqel S.,LESSI | Sabri A.,LIIAN | Aarab A.,LESSI
International Review on Computers and Software | Year: 2015

Moving objects detection in a scene from a video sequence is a fundamental and crucial problem in many vision systems such as video surveillance or the traffic monitoring. Background modeling is often used to detect moving objects which assumes that the moving objects take less time in the scene with respect to the background. Indeed, this assumption cannot be valid in case of a scene with fast moving objects. To overcome this problem, in this paper we propose a novel background modeling approach based on transitions intensities. In other words, we will focus on intensity changes (transitions) ofpixels during a scene instead of using duration information that a pixel pass in a state without any notable change in its intensity. The normalized RGB color is used to describe the appearance under change lighting conditions, and transition intensity is introduced to capture the dynamicity of objects over time. Experimental results on different video sequences have been presented to approve the effectiveness of the proposed algorithm. © 2015 Praise Worthy Prize S.r.l. - All rights reserved.


Fardousse K.,LESSI | Qjidaa H.,LESSI
WSEAS Transactions on Systems and Control | Year: 2015

In this paper, a diagonal feature extraction scheme for the recognizing an off-line handwritten motive is presented. In the feature extraction process, resized individual images motives of our base of the models “handwritten motives of crafts” of size 100×60 pixels is further divided into 60 equal zones, each of size 10×10 pixels. The features are extracted from the pixels of each zone by moving along their diagonals. This procedure is repeated for all the zones leading to extraction of 60 features for each basic image motives. These extracted features are used to train a feed forward back propagation neural network employed for performing classification and recognition tasks. Extensive simulation studies show that the recognition system using diagonal features provides good recognition accuracy while requiring less time for training. © 2015, World Scientific and Engineering Academy and Society. All rights reserved.


Senhaji S.,LESSI | Aarab A.,LESSI
International Review on Computers and Software | Year: 2013

A new and robust image watermarking technique based on the Partial Differential Equations (PDE) using contourlet-domain and Discrete Cosine Transform (DCT) is proposed in this paper. The main idea is to insert the mark with two different way (contourlet and DCT) on the two image components (geometric and texture) obtained by the decomposition model based on EDP. Experimentation has ensured the mark invisibility, the facility of extraction of the mark and the robustness against different kinds of attacks. © 2013 Praise Worthy Prize S.r.l. - All rights reserved.


Senhaji S.,LESSI | Sabri A.,LESSI | Aarab A.,LESSI
International Journal on Communications Antenna and Propagation | Year: 2011

In this paper, we present a new and robust image watermarking technique based on the Partial Differential Equations (PDE). The main idea is to use an additive watermarking scheme on the two image components (geometric and texture) obtained by the PDE. The watermark used is a binary matrix differently ponderated for the geometric and the texture component. Experimentation has ensured the mark invisibility, the facility of detection of the mark and the robustness against different kinds of attacks. © 2011 Praise Worthy Prize S.r.l.- All rights reserved.


Stitou Y.,University Bordeaux1 | Turcu F.,University Bordeaux1 | Najim M.,University Bordeaux1 | Radouane L.,LESSI
European Signal Processing Conference | Year: 2015

This paper deals with the parametric modelling of three-dimensional (3-D) stochastic processes. Based on the 3-D Wold-like decomposition theory, any 3-D discrete homogeneous process can be represented as a sum of three mutually orthogonal components: a completely non deterministic, a 'remote past' type deterministic and an evanescent component. The evanescent component can be further decomposed into two orthogonally components called evanescent of type 1 and evanescent of type 2. The aim of this paper is to propose a new parametric models able to describe both the spectral support and spatial structure of each component. © 2004 EUSIPCO.


Hmamed A.,LESSI | Zoulagh T.,LESSI | El Hajjaji A.,University of Picardie Jules Verne
STA 2014 - 15th International Conference on Sciences and Techniques of Automatic Control and Computer Engineering | Year: 2014

This paper presents new LMI conditions for full order robust L2 - L∞ filter design for continuous polytopic time-delay systems. This work is based on the PDLF approach to L2 - L∞ filtering. A new structure of slack variables is introduced to provide extra free dimensions in the solution space for L2 - L∞ optimization. A numerical example is presented to show the effectiveness of the proposed method. © 2014 IEEE.


Hmamed A.,LESSI | Zoulagh T.,LESSI | El Hajjaji A.,University of Picardie Jules Verne
STA 2014 - 15th International Conference on Sciences and Techniques of Automatic Control and Computer Engineering | Year: 2014

This paper presents new LMI conditions for full order robust L2 - L filter design for continuous polytopic time-delay systems. This work is based on the PDLF approach to L2 - L filtering. A new structure of slack variables is introduced to provide extra free dimensions in the solution space for L2 - L optimization. A numerical example is presented to show the effectiveness of the proposed method. © 2014 IEEE.


Hmamed A.,LESSI | El Aiss H.,LESSI | El Hajjaji A.,University of Picardie Jules Verne
Proceedings of the IEEE Conference on Decision and Control | Year: 2016

This paper studies the stability analysis problem of continuous time linear systems with time varying delay using the input-output approach. Based on the scaled small gain (SSG) theorem and the slack variables, an important stability analysis criterion is developed. The resulting less conservative analysis conditions are formulated in terms of LMIs to be easily solved using convex optimization techniques. Finally, numerical examples are given to demonstrate the advantages of the proposed method in terms of conservatism reduction. © 2015 IEEE.

Loading LESSI collaborators
Loading LESSI collaborators