Mohamed Chaouki - Academia.edu (original) (raw)

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Papers by Mohamed Chaouki

Skin detection is an important task for computer vision systems. A good method of skin ... more Skin detection is an important task for computer vision systems. A good method of skin detection means a good and successful result of the system. The colour is a good descriptor for image segmentation and classification; it allows detecting skin colour in the images. The lighting changes and the objects that have a colour similar than skin colour make the operation of skin detection difficult. In this paper, we proposed a method using the YCbCr colour space for skin detection and lighting effects elimination, then we use the information of texture to eliminate the false regions detected by the YCbCr skin model.

ACM SIGGRAPH 2018 Posters, 2018

The human brain is constantly solving enormous and challenging optimization problems in vision. D... more The human brain is constantly solving enormous and challenging optimization problems in vision. Due to the formidable meta-heuristics engine our brain equipped with, in addition to the widespread associative inputs from all other senses that act as the perfect initial guesses for a heuristic algorithm, the produced solutions are guaranteed to be optimal. By the same token, we address the problem of computing the depth and normal maps of a given scene under a natural but unknown illumination utilizing particle swarm optimization (PSO) to maximize a sophisticated photo-consistency function. For each output pixel, the swarm is initialized with good guesses starting with SIFT features as well as the optimal solution (depth, normal) found previously during the optimization. This leads to significantly better accuracy and robustness to textureless or quite specular surfaces.

2015 27th International Conference on Microelectronics (ICM), 2015

Developing robust visual tracking algorithms for real-world is still a major challenge today in m... more Developing robust visual tracking algorithms for real-world is still a major challenge today in many fields such as design, manufacturing, ecommerce and other fields are used to simulate the appearance of objects and scenes. Realistic looking is often critical, and calculating global illumination (GI) is an important contributor to image reliability; in which we take into account all interreflection effects in the scene. GI approximation methods, such as virtual point light (VPL) algorithms, are efficient, but they can produce image artifacts and distortions of object appearance. In this paper we present a practical algorithm for rendering diverse frequency of interreflection effects. Our method builds upon a standard representation of the scene, based on which a new mathematical formulation of the interreflection equation is made. We systematically study simulation of complex effects on image quality and material appearance of global illumination approximations made by VPL algorithms to provide a fast and smoother complex illumination. Efficiently, the computational effort is heavily reduced.

INTERNATIONAL JOURNAL ON Advances in Information Sciences and Service Sciences, 2010

In this paper we propose a new segmentation approach applied to Arabic handwriting, which can rec... more In this paper we propose a new segmentation approach applied to Arabic handwriting, which can reconstruct in offline a tracing path similar to that in the case of online. Our approach uses a semiskeletonization technique for following lines and calculation of the characteristics of characters. With the application of an SVM classifier in the classification phase, we were able to achieve very interesting recognition rates in reduced time. When compared to similar works, this work is very interesting for the Off-line recognition of Arabic handwriting.

SHS Web of Conferences, 2012

L'agriculture marocaine représente seulement 19 % du PIB national alors que 40 % de la population... more L'agriculture marocaine représente seulement 19 % du PIB national alors que 40 % de la population vit de ce secteur, elle connait aujourd'hui de profondes transformations sous l'impulsion d'un Plan national « Maroc Vert » (PMV) qui viseà améliorer la productivité agricole, et par là même contribuerà un meilleur revenu pour les agriculteurs (fellahs). Le Rif qui a longtempś eté un espace en marge des centres décisionnels n'échappe pasà cette volonté. Malgré des contraintes que nous aborderons, des potentialités agricoles et touristiques existent qui valoriseraient cet espace, et ce, dans un contexte de développement durable. Nous proposons dans cet article de faire un premier point sur les valeurs ajoutées envisageables, ainsi que sur une nouvelle méthodologie employée pour lesévaluerà savoir l'outil Bayesia Expert Knowledge Elicitation Environment(BEKEE). Des exemples d'espaces déjà mis en valeur, notamment par des techniques d'irrigation modernes sontégalement présentés. Cet article est placé sous licence Creative Commons Attribution 2.0 qui autorise la libre utilisation, distribution et reproduction du travail,à la condition que le document original soit correctement cité.

Communications in Computer and Information Science, 2011

In this paper, we propose a new learning method for multiclass support vector machines based on s... more In this paper, we propose a new learning method for multiclass support vector machines based on single class SVM learning method. Unlike the methods 1vs1 and 1vsR, used in the literature and mainly based on binary SVM method, our method learns a classifier for each class from only its samples and then uses these classifiers to obtain a multiclass decision model. To enhance the accuracy of our method, we build from the obtained hyperplanes new hyperplanes, similar to those of the 1vsR method, for use in classification. Our method represents a considerable improvement in the speed of training and classification as well the decision model size while maintaining the same accuracy as other methods.

Journal of Computer Science, 2006

This paper presents a method for integrating a technique of reconstruction scene (voxel colouring... more This paper presents a method for integrating a technique of reconstruction scene (voxel colouring) starting from images of the reference element of a volumetric texture, this one will be converted in a second phase into a whole of layers (2D images considered as transparent textures), which will be projected and composed successively on surface defined as volumetric grid using the Zbuffer algorithm. The model suggested allows primarily made realistic of repetitive complex scenes lower cost of calculation due to the effective exploitation of the capacities of the graphics boards and to the fact that it takes account of the level of detail according to the distance of the observer and the vision angle, in the representation of the reference element.

Hormone Research in Paediatrics, 2012

Background/Aims: True gigantism is an exceptional and fascinating pediatric disease. Our aim in t... more Background/Aims: True gigantism is an exceptional and fascinating pediatric disease. Our aim in this study was to describe the different etiologies of a large group of children with gigantism and the natural history of their growth. Methods: In this multicenter study, we considered as giant children, adolescents and adults whose heights were ≥3 SD compared to their target stature or to our population average lengths. Isolated hypogonadism and Klinefelter syndrome were excluded from this series. All underwent clinical exam, and hormonal and neurological investigations. Results: From 1980 to 2010, we observed 30 giants: 26 males (86.6%) and 4 females (mean age 19.8 ± 11 years). Among the 13 patients (40.3%) who consulted before the age of 16 years, 9 had acromegaly and 6 had mental retardation and body malformations. Based on growth hormone (GH) secretion evaluation, 2 groups were observed: pituitary gigantism (n = 16): GH = 150 ± 252 ng/ml (n ≤ 5), and other causes with normal GH (0....

European Journal of Endocrinology, 1994

lesialab.net

... Mohamed Khider University Biskra (Algeria) Chaouki.Babahenini@gmail.com, djedi_nour@yahoo.fr ... more ... Mohamed Khider University Biskra (Algeria) Chaouki.Babahenini@gmail.com, djedi_nour@yahoo.fr ... Westermann and Ertl in 1998 [6] presented a model including diffuse lighting in the medical images; they used a single texture of NxXxY resolution. ...

Les medinas de l'extreme nord-ouest du maroc font incontestablement partie de la gamme des at... more Les medinas de l'extreme nord-ouest du maroc font incontestablement partie de la gamme des attraits touristiques de cette region. Le phenomene touristique qui s'y pratique possede des aspects et des caracteristiques particuliers. La frequentation touristique dans ces villes historiques, est due aussi bien a leurs richesses patrimoniales qu'aux autres attraits touristiques, urbains et regionaux. Les pratiques et les motivations des touristes, varient selon qu'il s'agisse des touristes marocains ou etrangers. Quant a l'organisation du tourisme au sens strict du terme, on constate une certaine absence du role direct du planificateur du tourisme au maroc. Dans ces medinas, le role des collectivites locales et des petits acteurs locaux, est determinant. En ce qui concerne les equipements d'hebergement touristique, il y a une predominance des hotels non classes, notamment dans la medina de tanger et de chefchaouen ; quant a la ledina d'asilah, la location c...