Planification et automatisation d’une reconstruction 3D par stéréovision

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ISBN 13 :
Total Pages : 153 pages
Book Rating : 4.:/5 (819 download)

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Book Synopsis Planification et automatisation d’une reconstruction 3D par stéréovision by : Abdelkrim Belhaoua

Download or read book Planification et automatisation d’une reconstruction 3D par stéréovision written by Abdelkrim Belhaoua and published by . This book was released on 2011 with total page 153 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'automatisation de la numérisation est une étape indispensable au développement de la mesure tridimensionnelle dans différents domaines d'applications, comme par exemple l'évaluation d'objets manufacturés. Le but de ce travail de thèse est d'évaluer la conformité d'objets 3D manufacturés en tenant compte des tolérances géométriques et des incertitudes liées à différentes sources d'erreur. La reconstruction 3D est réalisée à partir d'un capteur stéréoscopique. La qualité de la reconstruction 3D peut être affectée de manière significative par les propriétés d'illumination. Par conséquent, la détermination de paramètres favorables d'illumination est un problème crucial que nous tentons de résoudre en optimisant le placement des sources d'illumination. La quantification des erreurs 3D de mesure fait aussi l'objet de cette thèse. L'estimation des erreurs 3D nous permet d'évaluer la qualité de reconstruction 3D et par conséquent d'augmenter les performances de notre système de mesure 3D. Un système d'évaluation dimensionnelle a été développé dans notre laboratoire. Ce système est composé de deux modules : le premier utilise les graphes de situations qui permettent l'automatisation et la gestion des différentes procédures de la reconstruction 3D. Le deuxième module, appelé HTP (Hierarchical Task Plan) se charge du contrôle de la séquence d'acquisitions ainsi que de la reconstruction 3D complète de l'objet et de son évaluation dimensionnelle. Tous les algorithmes développés ont été validés et intégrés dans ce système entièrement opérationnel, y compris un mécanisme de replanification dynamique permettant de s'adapter automatiquement aux conditions réelles d'acquisition.

Stéréovision locale et reconstruction 3D/4D

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ISBN 13 :
Total Pages : 143 pages
Book Rating : 4.:/5 (69 download)

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Book Synopsis Stéréovision locale et reconstruction 3D/4D by : Vincent Brandou

Download or read book Stéréovision locale et reconstruction 3D/4D written by Vincent Brandou and published by . This book was released on 2008 with total page 143 pages. Available in PDF, EPUB and Kindle. Book excerpt: L’objectif de cette thèse est de proposer une méthodologie complète de reconstruction 3D d’objets sous-marins naturels, améliorée par une nouvelle méthode d’acquisition afin de permettre des mesures quantitatives. Il a d’abord fallu prendre en compte les différents problèmes liés au milieu sous-marin profond ; la contrainte principale est que le système utilisé pour faire l’acquisition des images doit être contrôlé à des profondeurs très importantes, jusqu’à 6000 mètres, à l’aide d’un véhicule positionné sur le fond. Ainsi, une méthode permettant l’acquisition automatique d’images a été développée, adaptée à tout type d’objet sous-marin de faible échelle (environ 1m3). L’acquisition d’image est réalisée avec un système de stéréovision contrÔlé par un bras manipulateur. La méthode que nous proposons permet de connaître les paramètres extrinsèques des caméras du système de vision, par le suivi d’une trajectoire définie par la géométrie de la tête stéréo. Ainsi, la trajectoire est générée par le déplacement d’une caméra sur la position de l’autre caméra par asservissement visuel. Avec cette méthode, nous pouvons enregistrer des images à intervalles réguliers directement liés à la géométrie de la tête stéréo. Ensuite, le modèle 3D de l’objet sous-marin est calculé à partir des images collectées et des paramètres des caméras. Le résultat final est une reconstruction 3D dense avec un plaquage de texture, qui permet de faire des mesures métriques. Mots-clés: métrologie 3D, vision par ordinateur, stéréovision, asservissement visuel, trajectoire d’acquisition, reconstruction 3D.

3D Reconstruction Using a Stereo Vision System

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ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (84 download)

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Book Synopsis 3D Reconstruction Using a Stereo Vision System by : Toni Linares Bravo

Download or read book 3D Reconstruction Using a Stereo Vision System written by Toni Linares Bravo and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Imagerie multimodale et planification interactive pour la reconstruction 3D et la métrologie dimensionnelle

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ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (951 download)

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Book Synopsis Imagerie multimodale et planification interactive pour la reconstruction 3D et la métrologie dimensionnelle by : Ammar Hannachi

Download or read book Imagerie multimodale et planification interactive pour la reconstruction 3D et la métrologie dimensionnelle written by Ammar Hannachi and published by . This book was released on 2015 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: La fabrication de pièces manufacturées génère un nombre très important de données de différents types définissant les géométries de fabrication ainsi que la qualité de production. Ce travail de thèse s'inscrit dans le cadre de la réalisation d'un système de vision cognitif dédié à l'évaluation d'objets 3D manufacturés incluant éventuellement des surfaces gauches, en tenant compte des tolérances géométriques et des incertitudes. Ce système permet un contrôle exhaustif de pièces manufacturées et offre la possibilité d'une inspection tridimensionnelle automatique de la pièce. La mise en place d'un système de mesures multi-capteurs (passifs et actifs) a permis d'améliorer significativement la qualité d'évaluation par le biais d'une reconstruction tridimensionnelle enrichie de l'objet à évaluer. En particulier, nous avons employé simultanément un système stéréoscopique de vision et un système à projection de lumière structurée afin de reconstruire les contours et les surfaces de différents objets 3D.

The ETTO Principle: Efficiency-Thoroughness Trade-Off

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Publisher : Ashgate Publishing, Ltd.
ISBN 13 : 1409485994
Total Pages : 166 pages
Book Rating : 4.4/5 (94 download)

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Book Synopsis The ETTO Principle: Efficiency-Thoroughness Trade-Off by : Professor Erik Hollnagel

Download or read book The ETTO Principle: Efficiency-Thoroughness Trade-Off written by Professor Erik Hollnagel and published by Ashgate Publishing, Ltd.. This book was released on 2012-10-01 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt: Accident investigation and risk assessment have for decades focused on the human factor, particularly ‘human error’. This bias towards performance failures leads to a neglect of normal performance. It assumes that failures and successes have different origins so there is little to be gained from studying them together. Erik Hollnagel believes this assumption is false and that safety cannot be attained only by eliminating risks and failures. The alternative is to understand why things go right and to amplify that. The ETTO Principle looks at the common trait of people at work to adjust what they do to match the conditions. It proposes that this efficiency-thoroughness trade-off (ETTO) is normal. While in some cases the adjustments may lead to adverse outcomes, these are due to the same processes that produce successes.

Product Life-Cycle Management

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Publisher : John Wiley & Sons
ISBN 13 : 1118587529
Total Pages : 389 pages
Book Rating : 4.1/5 (185 download)

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Book Synopsis Product Life-Cycle Management by : Max Giordano

Download or read book Product Life-Cycle Management written by Max Giordano and published by John Wiley & Sons. This book was released on 2012-12-17 with total page 389 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book gives a comprehensive view of the most recent major international research in the field of tolerancing, and is an excellent resource for anyone interested in Computer Aided Tolerating. It is organized into 4 parts. Part 1 focuses on the more general problems of tolerance analysis and synthesis, for tolerancing in mechanical design and manufacturing processes. Part 2 specifically highlights the simulation of assembly with defects, and the influence of tolerances on the quality of the assembly. Part 3 deals with measurement aspects, and quality control throughout the life cycle. Different measurement technologies and methods for estimating uncertainty are considered. In Part 4, different aspects of tolerancing and their interactions are explored, from the definition of functional requirement to measurement processes in a PLM approach.

Marketing in Zambia

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ISBN 13 :
Total Pages : 24 pages
Book Rating : 4.3/5 (121 download)

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Book Synopsis Marketing in Zambia by : Reginald Biddle

Download or read book Marketing in Zambia written by Reginald Biddle and published by . This book was released on 1985 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Water Saving in Agriculture

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ISBN 13 :
Total Pages : 116 pages
Book Rating : 4.:/5 (1 download)

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Book Synopsis Water Saving in Agriculture by :

Download or read book Water Saving in Agriculture written by and published by . This book was released on 2008 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt:

ICT for Transport

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Publisher : Edward Elgar Publishing
ISBN 13 : 1783471298
Total Pages : 337 pages
Book Rating : 4.7/5 (834 download)

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Book Synopsis ICT for Transport by : Nikolas Thomopoulos

Download or read book ICT for Transport written by Nikolas Thomopoulos and published by Edward Elgar Publishing. This book was released on 2015-05-29 with total page 337 pages. Available in PDF, EPUB and Kindle. Book excerpt: Information and Communication Technologies (ICT) are rapidly evolving and taking centre stage in everyday life in the 21st century alongside the increasing importance and value of information. This is particularly evident in the transport sector where

Intelligent Structures

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Publisher : CRC Press
ISBN 13 : 020349816X
Total Pages : 470 pages
Book Rating : 4.2/5 (34 download)

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Book Synopsis Intelligent Structures by : K.P. Chong

Download or read book Intelligent Structures written by K.P. Chong and published by CRC Press. This book was released on 2003-10-04 with total page 470 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the International Workshop on Intelligent Structures, Taipei, Taiwan, 23-26 July 1990.

Human-Automation Interaction

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Publisher : CRC Press
ISBN 13 :
Total Pages : 352 pages
Book Rating : 4.F/5 ( download)

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Book Synopsis Human-Automation Interaction by : Mustapha Mouloua

Download or read book Human-Automation Interaction written by Mustapha Mouloua and published by CRC Press. This book was released on 1997-02 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt: Research and development in the field of man-machine systems has evolved tremendously in the last 20 years. For almost every man-machine system, whether in the aviation industry, medical systems, industrial process control, or just for use in leisure activities or the home environment, it is possible to see many automated systems and devices that have replaced the human component as a key element. The fast evolution in computer technology has transformed the course of our daily lives by making these technological innovations a viable option on which to rely. These varied technological advances have reduced the burden of excessive physical and cognitive demands imposed upon human operators. However, they have also resulted in several behavior related problems such as a loss in situation awareness, increased mental workload, monitoring inefficiency, and inability to revert to manual control under systems malfunction. Covering a wide variety of human factors issues across several domains of application, this volume represents a snapshot of a series of experimental and investigative studies concerned with the impact of automation technology on human performance. The topics addressed deal with both theoretical and applied issues. Although more emphasis was placed on the aviation industry, several other human-machine systems where automation technology is implemented are also represented. This book enables students, scientists, and researchers from a variety of fields such as academia, government, and industry to achieve the following: * review and update their basic and applied knowledge in several domains where automation technology is implemented; * review and evaluate recent empirical studies on automation and human performance across several domains; * address training issues and guidelines for the design of intelligent, hybrid human-machine systems; and * discuss future trends in automation research applicable to the 21st century.

Scientific Canadian Mechanics' Magazine and Patent Office Record

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ISBN 13 :
Total Pages : 1070 pages
Book Rating : 4.E/5 ( download)

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Book Synopsis Scientific Canadian Mechanics' Magazine and Patent Office Record by : Canada. Patent Office

Download or read book Scientific Canadian Mechanics' Magazine and Patent Office Record written by Canada. Patent Office and published by . This book was released on 1966-03 with total page 1070 pages. Available in PDF, EPUB and Kindle. Book excerpt: