sihem lazzouni

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Papers by sihem lazzouni

Improved Diagnosis of Lung Cancer Classification based on Deep learning Method

International journal of biomedical engineering and technology, 2024

$Research paper thumbnail of Mammograms enhancement based on multifractal measures for microcalcifications detection$

Mammograms enhancement based on multifractal measures for microcalcifications detection

International Journal of Biomedical Engineering and Technology

$Research paper thumbnail of Classification of Mammographic ROI for Microcalcification Detection Using Multifractal Approach$

Classification of Mammographic ROI for Microcalcification Detection Using Multifractal Approach

Journal of Digital Imaging

Microcalcifications (MCs) are the main signs of precancerous cells. The development of aided-syst... more Microcalcifications (MCs) are the main signs of precancerous cells. The development of aided-system for their detection has become a challenge for researchers in this field. In this paper, we propose a system for MCs detection based on the multifractal approach that classifies mammographic ROIs into normal (healthy) or abnormal ROIs containing MCs. The proposed method is divided into four main steps: a mammogram pre-processing step based on breast selection, breast density reduction using haze removal algorithm and contrast enhancement using multifractal measures. The second step consists of extracting the normal and abnormal ROIs and calculating the multifractal spectrum of each ROI. The next step represents the extraction of the multifractal features from the multifractal spectrum and the GLCM characteristics of each ROI. The last step is the classification of ROIs where three classifiers are tested (KNN, DT, and SVM). The system is evaluated on images from the INbreast database (...

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$Research paper thumbnail of Classification of Fundus Images based on Multifractal Features$

Classification of Fundus Images based on Multifractal Features

2022 7th International Conference on Image and Signal Processing and their Applications (ISPA)

$Research paper thumbnail of Contour and region characterisation of breast tumour masses with fractal and statistical attributes$

Contour and region characterisation of breast tumour masses with fractal and statistical attributes

International Journal of Biomedical Engineering and Technology, 2018

Breast cancer continues to rank at the forefront of public health problems. Characterisation of b... more Breast cancer continues to rank at the forefront of public health problems. Characterisation of breast tissue is a step in computer-aided diagnosis, so we focus on it considering in particular texture and contour analysis of tumour masses with fractal and statistical approaches. Fist we extracted the mammographic mass with the mathematical morphology segmentation tool Watershed Line algorithm. Then we calculated fractal dimension of the mass contour using box counting algorithm. In addition to that we measured textural attributes from the grey-level co-occurrence matrix of the segmented image (region). Finally, we used Support Vector Machine classifier evaluated in K-fold cross-validation mode with OneVsOne strategy considering multiclass classification: Benin masses/Malignant masses. As a result we obtained a classification rate of 98%.

New semi-automated segmentation approach of the left ventricle applied to cine MR images analysis

International Journal of Applied Pattern Recognition, 2018

Cardiovascular abnormalities have become one of the most dangerous diseases. They affect people a... more Cardiovascular abnormalities have become one of the most dangerous diseases. They affect people around the entire world and some countries are more concerned by this illness. In this paper, a new methodological approach dedicated to analyse and delineate the short-axis cardiac MRI of the left ventricle (LV) is presented. In this case, thresholding and morphological operation, active contours model and region growing are combined to extract endocardial exactly. The systole volume (VTS), diastole volume (VTD) and ejection volume (EV) are then successively calculated to predict the cardiovascular diseases. The results are validated by a database (Cousty et al., 2010) where the expert manual contouring was available and the similarity index (Jaccard index) between the proposed method and expert segmentations are calculated. After discussion, we conclude that the presented method leads to satisfying results end-diastolic endocardium (0.92) and endsystolic endocardium (0.88), achieving both fast calculation and accuracy objectives.

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New Algorithm for Fractal Dimension Estimation based on Texture Measurements: Application on Breast Tissue Characterization

International Journal of Image, Graphics and Signal Processing, 2016

Fractal analysis is currently in full swing in particular in the medical field because of the fra... more Fractal analysis is currently in full swing in particular in the medical field because of the fractal nature of natural phenomena (vascular system, nervous system, bones, breast tissue ...). For this, many algorithms for estimating the fractal dimension have emerged. Most of them are based on the principle of box counting. In this work we propose a new method for calculating fractal attributes based on contrast homogeneity and energy that have been extracted from gray level co-occurrence matrix. As application we are investigated in the characterization and classification of mammographic images with SuportVectorMachine classifier. We considered in particular images with tumor masses and architectural disorder to compare with normal ones. We calculate, for comparison the fractal dimension obtained by a reference method (triangular prism) and perform a classification similar to the previous. Results obtained with new algorithm are better than reference method (classification rate is 0.91 vs 0.65). Hence new fractal attributes are relevant.

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La linéarisation par morceaux et la dérivéé optimale dans l'analyse des circuits non linéaires

Technologies Avancées, 2004

An adaptive feedback control for chaos synchronization of nonlinear systems with different order

Communications in Nonlinear Science and Numerical Simulation, 2007

This paper deals with the chaotic synchronization of fourth-order system and second driven oscill... more This paper deals with the chaotic synchronization of fourth-order system and second driven oscillators. Such a problem is related to the synchronization of strictly different chaotic systems. We show that the dynamical evolution of second-order driven oscillators can be synchronized with the projection on canonical planes of a fourth-order chaotic system. In this sense, it is said that the synchronization

Chaos control using small-amplitude damping signals of the extended Duffing equation

Communications in Nonlinear Science and Numerical Simulation, 2007

This paper examines the application of a simple feedback controller to eliminate the chaotic beha... more This paper examines the application of a simple feedback controller to eliminate the chaotic behavior in a controlled extended Duffing system. The main idea is to regulate the chaotic motion of an extended Duffing system around less complex attractors, such as equilibrium points and periodic orbits. The proposed feedback controller is composed by a high-pass filter and a saturator, so

Slow flow solutions and chaos control in an electromagnetic seismometer system

Chaos, Solitons & Fractals, 2006

We study in this paper the dynamics and chaos control of a nonlinear electromagnetic seismometer ... more We study in this paper the dynamics and chaos control of a nonlinear electromagnetic seismometer system consisting of an extended Duffing electrical oscillator magnetically coupled with a natural Duffing mechanical oscillator. The singular perturbation method is used to find slow solutions. Some bifurcation structures and the variation of the corresponding Lyapunov exponent are obtained. Transitions from a regular behavior to chaotic orbits are seen to occur for large amplitudes of the external excitation. We also examine the application of a simple adaptive damping feedback controller to eliminate the chaotic behavior in a controlled extended Duffing system. The main idea is to regulate the chaotic motion of the electromagnetic seismometer system around less complex attractors, such as equilibrium points and periodic orbits. The effectiveness and efficiency of the proposed feedback control strategy is illustrated by means of numerical simulations.

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$Research paper thumbnail of Digital mammograms analysis using fractal and multifractal methods$

Digital mammograms analysis using fractal and multifractal methods

2019 6th International Conference on Image and Signal Processing and their Applications (ISPA), 2019

Malathion is an insecticide which is commonly used for the agricultural and non-agricultural purp... more Malathion is an insecticide which is commonly used for the agricultural and non-agricultural purposes in India. Malathion is found effective for controlling mosquitoes, flies, household insects, animal parasites (ectoparasites) and head & body lice. The effect of insecticide Malathion is found to be highly toxic even to the non-targeted aquatic organisms including fish. The aim of the study, was to determine the effect of insecticide malathion on some biochemical characteristics (protein, carbohydrate and cholesterol in gill, liver, muscle and kidney) of the fish, Labeo rohita. Toxicity evaluation tests were conducted to determine LC50 values. The 1/10 th of 96 hrs, LC50 value was selected as sublethal concentrations (0.5 ppm). All biochemical's parameters were found to be decreased in all tissues on comparison with control. The results indicated the toxic nature of the insecticide malathion.

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