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Validating the correct wearing of protection mask by taking a selfie: design of a mobile application "CheckYourMask" to limit the spread of COVID-19 / Karim Hammoudi (2020)  

Public contenu dans HAL Hyper articles en ligne / Centre pour la Communication Scientifique Directe CCSD (2000)   Titre : Validating the correct wearing of protection mask by taking a selfie: design of a mobile application "CheckYourMask" to limit the spread of COVID-19 Type de document : Article/Communication Auteurs : Karim Hammoudi , Auteur ; Adnane Cabani, Auteur ; Halim Benhabiles, Auteur ; Mahmoud Melkemi, Auteur Editeur : Paris : HAL Année de publication : 2020 Importance : 6 p. Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Intelligence artificielle [Termes IGN] application informatique [Termes IGN] interface mobile [Termes IGN] maladie infectieuse [Termes IGN] prévention [Termes IGN] reconnaissance de formes [Termes IGN] santé [Termes IGN] téléphone intelligent Résumé : (Auteur) In a context of a virus that is transmissive by sputtering, wearing masks appear necessary to protect the wearer and to limit the propagation of the disease. Currently, we are facing the 2019-20 coronavirus pandemic. Coronavirus disease 2019 (COVID-19) is an infectious disease with first symptoms similar to the flu. COVID-19 appeared first in China and very quickly spreads to the rest of the world. The COVID-19 contagiousness is known to be high by comparison with the flu. In this paper, we propose a design of a mobile application for permitting to everyone having a smartphone and being able to take a picture to verify that his/her protection mask is correctly positioned on his/her face. Such application can be particularly useful for people using face protection mask for the first time and notably for children and old people. The designed method exploits Haar-like feature descriptors to detect key features of the face and a decision-making algorithm is applied. Experimental results show the potential of this method in the validation of the correct mask wearing. To the best of our knowledge, our work is the only one that currently proposes a mobile application design "CheckYourMask" for validating the correct wearing of protection mask. Numéro de notice : P2020-008 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Preprint nature-HAL : Préprint DOI : sans date de publication en ligne : 21/05/2020 En ligne : https://hal.archives-ouvertes.fr/hal-02614790 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=95115

A synergistic approach for recovering occlusion-free textured 3D maps of urban facades from heterogeneous cartographic data / Karim Hammoudi in International journal of advanced robotic systems, vol 10 (2013)  

Public [article]  inInternational journal of advanced robotic systems > vol 10 (2013) . - pp 316 - 326 Titre : A synergistic approach for recovering occlusion-free textured 3D maps of urban facades from heterogeneous cartographic data Type de document : Article/Communication Auteurs : Karim Hammoudi , Auteur ; Fadi Dornaika , Auteur ; Bahman Soheilian , Auteur ; Bruno Vallet , Auteur ; John McDonald, Auteur ; Nicolas Paparoditis , Auteur Année de publication : 2013 Article en page(s) : pp 316 - 326 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques [Termes IGN] données lidar [Termes IGN] données localisées 3D [Termes IGN] façade [Termes IGN] image terrestre [Termes IGN] modèle numérique du bâti [Termes IGN] texture d'image [Termes IGN] zone urbaine dense Résumé : (auteur) In this paper, we present a practical approach for generating an occlusion-free textured 3D map of urban facades by the synergistic use of terrestrial images, 3D point clouds and area-based information. Particularly in dense urban environments, the high presence of urban objects in front of the facades causes significant difficulties for several stages in computational building modeling. Major challenges lie on the one hand in extracting complete 3D facade quadrilateral delimitations and on the other hand in generating occlusion-free facade textures. For these reasons, we describe a straightforward approach for completing and recovering facade geometry and textures by exploiting the data complementarity of terrestrial multi-source imagery and area-based information. Numéro de notice : A2013-804 Affiliation des auteurs : MATIS+Ext (1993-2011) Thématique : IMAGERIE Nature : Article DOI : 10.5772/56570 date de publication en ligne : 01/01/2013 En ligne : http://dx.doi.org/10.5772/56570 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=80078 [article]

Design, implementation and simulation of an experimental multi-camera imaging system for terrestrial and multi-purpose mobile mapping platforms: a case study / Karim Hammoudi in Applied Mechanics and Materials, vol 332 (2013)  

Public [article]  inApplied Mechanics and Materials > vol 332 (2013) . - pp 139 - 144 Titre : Design, implementation and simulation of an experimental multi-camera imaging system for terrestrial and multi-purpose mobile mapping platforms: a case study Type de document : Article/Communication Auteurs : Karim Hammoudi , Auteur ; John McDonald, Auteur Année de publication : 2013 Projets : 2-Pas d'info accessible - article non ouvert / Article en page(s) : pp 139 - 144 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] prise de vue terrestre [Termes IGN] système de numérisation mobile Résumé : (auteur) Mobile Mapping Systems (MMS’s) are powerful tools for rapidly and massively collecting imagery in various environments (e.g., rural, semi-urban, urban). In particular, the data collected at terrestrial level can be exploited to complement aerial acquisitions for extending GIS databases,visualizing and modeling urban environments and studying environment morphogenesis over time. Hence, the development of mobile mapping platforms is a topic of great interest for many mapping agencies and surveying companies. Moreover, the experimental imaging systems of mapping vehicles are equipped with varied infrastructures in part resulting from the wide range of targeted applications. Determining a detailed design procedure for such imaging systems is of critical importance, and can be both arduous and time-consuming. Although commercial imaging systems can be exploited directly they are often pre-configured for specific applications. For these reasons, we propose a case study that deals with the development of an orientable and scalable imaging system. In particular, this paper focusses on the primary stage of the mechanical implementation of a multi-camera infrastructure. To this effect, we provide a design document that includes full technical specifications and drawings for creating a roof-mounted camera mast from a vehicle platform. We also provide an inventory of resources required for creating the system. As part of the design process we analyse some well-known MMS’s paying particular attention to their imaging systems. Finally, we evaluate the proposed design by creating the complete 3D mock-up of the camera system at real-scale and by simulating camera configurations from an experimental van platform. Experimental results clearly show the usefulness of this study in the design of an experimental and multi-purpose imaging system. Numéro de notice : A2013-805 Affiliation des auteurs : IGN+Ext (2012-2019) Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.4028/www.scientific.net/AMM.332.139 En ligne : http://dx.doi.org/10.4028/www.scientific.net/AMM.332.139 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=80114 [article]

Contributions to the 3D city modeling. 3D polyhedral building model reconstruction from aerial images & 3D facade modeling from terrestrial 3D point cloud and images / Karim Hammoudi (2011)  

Public Titre : Contributions to the 3D city modeling. 3D polyhedral building model reconstruction from aerial images & 3D facade modeling from terrestrial 3D point cloud and images Type de document : Thèse/HDR Auteurs : Karim Hammoudi , Auteur ; Nicolas Paparoditis , Directeur de thèse Editeur : Paris : Institut Géographique National - IGN Année de publication : 2011 Importance : 234 p. Format : 21 x 30 cm Note générale : Bibliographie Ph.D. Thesis submitted for the degree of Doctor of Philosophy in Signal and Image Processing from the Université Paris-Est Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image [Termes IGN] canalisation [Termes IGN] données lidar [Termes IGN] données localisées 3D [Termes IGN] façade [Termes IGN] lasergrammétrie [Termes IGN] modèle 3D de l'espace urbain [Termes IGN] polyèdre [Termes IGN] reconstruction 3D du bâti [Termes IGN] route [Termes IGN] semis de points [Termes IGN] système de numérisation mobile [Termes IGN] texturage [Termes IGN] toit Résumé : (Auteur) L'objectif principal de ce travail est le développement de recherches en modélisation 3D du bâti. En particulier, la recherche en reconstruction 3D de bâtiment est un sujet très développé depuis les années 90. Malgré tout, il paraît nécessaire de poursuivre les recherches dans cet axe étant donnée que les approches actuelles consacrées à la reconstruction 3D de bâtiment (bien qu'efficaces) rencontrent encore des difficultés en terme de généralisation, de cohérence et de précision. Par ailleurs, les récents développements des systèmes d'acquisitions de rues tel que les systèmes de cartographie mobile ouvrent de nouvelles perspectives d'amélioration de la modélisation des bâtiments dans le sens ou les données terrestres (très précises et résolues) peuvent être exploitées avec davantage de cohérence (en comparaison à l'aérien) pour enrichir les modèles de bâtiments au niveau des façades (la géométrie, la texture). Ainsi, des approches de modélisation aériennes et terrestres sont individuellement proposées. Au niveau aérien, nous décrivons une approche directe et dépourvu d'extraction et d'assemblage de primitives géométriques en vue de la reconstruction 3D de modèles polyédriques simples de bâtiments à partir d'un jeu d'images aériennes calibrées. Au niveau terrestre, plusieurs approches qui décrivent essentiellement un pipeline pour la modélisation 3D des façades urbaines sont proposées; à savoir, la segmentation et classification de nuage de rues urbaines, la modélisation géométrique des façades urbaines et le texturage des façades urbaines comportant des occultations causées par d'autres objets du mobilier urbain. Note de contenu : I Introduction 1 Introduction 1.1 Global context 1.1.1 Towards 3D Mapping 1.2 Specific Context of the Thesis 1.1.1 Positioning of the Thesis in the IGN Research 1.3 Problem Statement 1.4 Major Contributions 1.5 Organization of the Thesis II Aerial Building Modeling 2 Extracting 3D Polyhedral Building Models from Aerial Images 2.1 Introduction and Motivation 2.1.1 Chapter Contribution 2.2 Related Work 2.3 Problem Statement and Model Parametrization 2.4 Proposed Approach 2.4.1 Multiscopic Context and 3D to 2D Projection 2.4.2 Measuring Model-to-Data Consistency 2.4.3 Computing the Polyhedral Building Model 2.5 Experimental Results and Performance Study 2.5.1 Input Dataset 2.5.2 Reconstructed 3D Models and Convergence Study 2.5.3 Accuracy Evaluation 2.5.4 Performance in the Presence of Image Noise 2.5.5 Performance according to the Image Resolution 2.5.6 Performance in the Presence of Superstructures 2.5.7 Performance in the Presence of Significant Shadows 2.6 Conclusions 2.6.1 Contribution 2.6.2 Future Work III Terrestrial Facade Modeling 3 Properties of Terrestrial Urban Laser Data 3.1 Urban Street Facades Modeling 3.1.1 A Priori Knowledge on Street Facades 3.2 Dataset Acquired by the Mobile Mapping System 3.2.1 The IGN Street Mobile Mapping System 3.2.2 Acquisition Protocol, Collected Data and their Management 3.3 Exploiting Laser Data: Challenges and Difficulties 3.3.1 Laser Reflectance 3.3.2 Variability of Point Density 3.3.3 Data Redundancy 3.3.4 Static and Mobile Occlusions 3.3.5 Visibility and Coverage of Urban Objects 3.3.6 3D Data Misalignment 3.4 Conclusion 4 Segmenting and Classifying Terrestrial Urban Street Point Cloud 4.1 Introduction and motivation 4.2 Related Work 4.3 Proposed Approaches 4.3.1 3D Data Pre-processing 4.3.2 Accumulation Map Generation (Euclidean) 4.3.3 Map-based Segmentation into Vertical and Surface Clusters 4.3.4 Approach 1: Direct Urban Point Cloud Segmentation from the Cadastral Map 4.3.5 Approach 2: Model-less Urban Point Cloud Segmentation 4.4 Experimental Results and Performance Study 4.4.1 Experimental setup 4.4.2 Performance of Major Segmentation Stages 4.4.3 Overall Analysis and Accuracy Assessment 4.5 Conclusions 4.5.1 Contribution 5 Facade Modeling and Occlusion-free Texturing from Image and Laser Data 5.1 Introduction and Motivation 5.1.1 Compatibility and Divergence between Aerial-based Building Modeling and Ground-based Facade Modeling 5.1.2 Related Work 5.2 Terrestrial-based Facade Modeling 5.2.1 Problem Statement and Main Objectives 5.2.2 Related Work 5.3 Proposed approach 5.3.1 Parametrization of Street Facade Models vs. Facade LOD 5.3.2 Generating Aerial/Terrestrial Compatible Facade Models 5.3.3 Limitations of Laser Data in Facade Top Delimitation 5.3.4 Investigations for Generating Facade Models adapted for the Walk-through Street Visualization 5.3.5 Generating Occlusion-free Facade Textures 5.4 Experimental Results and Performance Study 5.4.1 Generated Wire-Frame 3D mode 5.4.2 Accuracy Evaluation 5.4.3 Performance in Enhancing Facade LOD from Laser Data 5.4.4 Image-based Skyline Detection 5.4.5 Generated Occlusion-free Texture 5.5 Conclusions 5.5.1 Contribution 5.5.2 Future Works IV Conclusion and Future Works 6 Conclusion and Future Works 6.1 Synthesis of Researches and Contributions 6.1.1 The Generation of Simple Polyhedral Building Models from Aerial Images 6.1.2 The Segmentation of Urban Street in Terrestrial Laser Data 6.1.3 The Facade Modeling from Terrestrial Multi-source Data 6.2 Future Works 6.2.1 An Unified Pipeline for the Facade Modeling 6.2.2 The Full Enfranchisement of the Conventional Cadastral Map (Man-made) in the Facade Model Generation 6.2.3 The Fusing of Generated Aerial-based Building Models and Terrestrial-based Facade Models 6.2.4 The Enhancement of LoD in the Facade Models 6.3 Work Outcomes V Appendix Numéro de notice : 14432 Affiliation des auteurs : MATIS (1993-2011) Thématique : IMAGERIE Nature : Thèse française Note de thèse : Thèse de doctorat : Signal and Image Processing : Paris Est : 2011 Organisme de stage : MATIS (IGN) nature-HAL : Thèse DOI : sans En ligne : https://hal.archives-ouvertes.fr/tel-00682442 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=45250

A featureless approach to 3D polyhedral building modeling from aerial images / Karim Hammoudi in Sensors, vol 11 n° 1 (January 2011)  

Public [article]  inSensors > vol 11 n° 1 (January 2011) . - pp 228 - 259 Titre : A featureless approach to 3D polyhedral building modeling from aerial images Type de document : Article/Communication Auteurs : Karim Hammoudi , Auteur ; Fadi Dornaika , Auteur Année de publication : 2011 Article en page(s) : pp 228 - 259 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique [Termes IGN] image aérienne [Termes IGN] luminance lumineuse [Termes IGN] mesure de similitude [Termes IGN] méthode robuste [Termes IGN] orthoimage [Termes IGN] reconstruction 3D du bâti Résumé : (auteur) This paper presents a model-based approach for reconstructing 3D polyhedral building models from aerial images. The proposed approach exploits some geometric and photometric properties resulting from the perspective projection of planar structures. Data are provided by calibrated aerial images. The novelty of the approach lies in its featurelessness and in its use of direct optimization based on image rawbrightness. The proposed framework avoids feature extraction and matching. The 3D polyhedral model is directly estimated by optimizing an objective function that combines an image-based dissimilarity measure and a gradient score over several aerial images. The optimization process is carried out by the Differential Evolution algorithm. The proposed approach is intended to provide more accurate 3D reconstruction than feature-based approaches. Fast 3D model rectification and updating can take advantage of the proposed method. Several results and evaluations of performance from real and synthetic images show the feasibility and robustness of the proposed approach. Numéro de notice : A2011-611 Affiliation des auteurs : IGN+Ext (1940-2011) Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.3390/s110100228 date de publication en ligne : 28/12/2010 En ligne : https://doi.org/10.3390/s110100228 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=91711 [article]

Extracting wire-frame models of street facades from 3D point clouds and the corresponding cadastral map / Karim Hammoudi (01/10/2010)  

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Extracting building footprint from 3D point clouds using terrestrial laser scanning at street level / Karim Hammoudi (01/12/2009) 

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Extracting 3D polyhedral building models from aerial images using a featureless and direct approach / Fadi Dornaika (20/05/2009)

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