Descripteur
Termes IGN > 1-Candidats > rendu (géovisualisation)
rendu (géovisualisation) |
Documents disponibles dans cette catégorie (78)
Ajouter le résultat dans votre panier
Visionner les documents numériques
Affiner la recherche Interroger des sources externes
Etendre la recherche sur niveau(x) vers le bas
Titre : Modeling and rendering architecture from photographs Type de document : Thèse/HDR Auteurs : Paul Ernest Debevec, Auteur ; Jitendra Malik, Directeur de thèse Editeur : Berkeley [Californie - Etats-Unis] : University of California Année de publication : 1996 Importance : 140 p. Format : 21 x 30 cm Note générale : bibliographie
Dissertation submitted for the degree of Doctor of Philosophy in Computer Science in the Graduate Division of the University of California at BerkeleyLangues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image
[Termes IGN] architecture urbaine
[Termes IGN] bâtiment
[Termes IGN] distorsion d'image
[Termes IGN] étalonnage de capteur (imagerie)
[Termes IGN] infographie
[Termes IGN] modèle 3D du site
[Termes IGN] modèle géométrique de prise de vue
[Termes IGN] modélisation 3D
[Termes IGN] objectif grand angulaire
[Termes IGN] patrimoine immobilier
[Termes IGN] photogrammétrie architecturale
[Termes IGN] rendu réaliste
[Termes IGN] restitution
[Termes IGN] scène 3D
[Termes IGN] texturage
[Termes IGN] vision par ordinateurRésumé : (auteur) Imagine visiting your favorite place, taking a few pictures, and then turning those pictures into a photorealisic three-dimensional computer model. The work presented in this thesis combines techniques from computer vision and computer graphics to make this possible. The applications range from architectural planning and archaeological reconstructions to virtual environments and cinematic special effects. This thesis presents an approach for modeling and rendering existing architectural scenes from sparse sets of still photographs. The modeling approach, which combines both geometry-based and image-based techniques, has two components. The first component is an interactive photogrammetric modeling method which facilitates the recovery of the basic geometry of the photographed scene. The photogrammetric modeling approach is effective, convenient, and robust because it exploits the constraints that are characteristic of architectural scenes. The second component is a modelbased stereo algorithm, which recovers how the real scene deviates from the basic model. By making use of the model, this new technique robustly recovers accurate depth from widely-spaced image pairs. Consequently, this approach can model large architectural environments with far fewer photographs than current image-based modeling approaches. For producing renderings, this thesis presents view-dependent texture mapping, a method of compositing multiple views of a scene that better simulates geometric detail on basic models. This approach can be used to recover models for use in either geometry-based or imagebased rendering systems. This work presents results that demonstrate the approach’s ability to create realistic renderings of architectural scenes from viewpoints far from the original photographs. This thesis concludes with a presentation of how these modeling and rendering techniques were used to create the interactive art installation Rouen Revisited, presented at the SIGGRAPH ’96 art show. Note de contenu : Introduction
1- Background and Related Work
2- Overview
3- Camera Calibration
4- Photogrammetric Modeling
5- View-Dependent Texture Mapping
6- Model-Based Stereo
7- Rouen RevisitedNuméro de notice : 21758 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Thèse étrangère Note de thèse : PhD Thesis : Computer Science : University of California at Berkeley : 1996 En ligne : http://www.pauldebevec.com/Thesis/debevec-phdthesis-1996.pdf Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=91130 Réservation
Réserver ce documentExemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 21758-01 THESE Livre Centre de documentation Thèses Disponible Modellhafte Arbeitsabläufe zur digitalen Erstellung von topographischen und geologischen Karten und dreidimensionalen Visualisierungen / Lorenz Hurni (1995)
Titre : Modellhafte Arbeitsabläufe zur digitalen Erstellung von topographischen und geologischen Karten und dreidimensionalen Visualisierungen Titre original : [Déroulement du travail d'un modèle pour l'élaboration numérique de cartes topographiques et géologiques et la visualisation en 3D] Type de document : Monographie Auteurs : Lorenz Hurni, Auteur Editeur : Zurich : Eidgenossische Technische Hochschule ETH - Ecole Polytechnique Fédérale de Zurich EPFZ Année de publication : 1995 Collection : Dissertationen ETH num. 11066 Importance : 190 p. Format : 21 x 30 cm Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Géomatique
[Termes IGN] carte géologique
[Termes IGN] carte topographique
[Termes IGN] données maillées
[Termes IGN] données vectorielles
[Termes IGN] estompage automatique
[Termes IGN] généralisation cartographique automatisée
[Termes IGN] logiciel de cartographie
[Termes IGN] modèle cartographique
[Termes IGN] objet géographique
[Termes IGN] rendu réaliste
[Termes IGN] visualisation 3DRésumé : (Auteur) This work is based on three mapping projects carried out at the Institute of Cartography at the Swiss Federal Institute of Technology (ETH) Zurich: A topographical and a geological map 1:25'000 of the Methana peninsula in Greece, a town map of the nearby tourist resort Poros, and a three-dimensionally visualized geological map of the Matterhorn have been produced entirely by digital methods. Based on these projects, the techniques and conditions for producing these types of maps in a digital environment are investigated and exemplary workflows are presented. Great importance is placed on conserving the graphic quality and content of the map, and possibly even obtaining an increase in quality as compared to conventionally produced map. As the cultural features of a map clearly show, the aspects of cartographic design and generalization play an important role in the transition from the digital landscape model (DLM) to the digital cartographic model (DCM). The process of generalization can be divided into the following functions: enlargement, selection, simplification, aggregation, displacement, accentuation and classification. Additional information not included in the map geometry is also very important. In most cases the cartographer must figure out this information during the process of designing the map. Thus, generalization and design functions interact closely. Such conflicts and digital workflows which allow an easier solution are presented.
Thanks to image processing functions and modern reproduction technology, topographical area features such as different types of land use and geological units can be included in the map. These methods are also used to generate analytical hill shading from digital height models and integrate them in the map image. This project introduces a computer program with which simplified cliff drawing can be generated using ridge lines. The upper and lower edges of a cliff are digitized manually from sketches. The program defines the line widths according to an illumination model. The rough appearance is simulated by a local variation of the widths and position of the lines using a random function. It is possible to simulate round (concave and convex) rock shapes. The program can be fine-tuned with about 50 parameters. In order to solve complex cartographic problems, the possibilities of such a «Cartographic Software Tuning» by an experienced operator (cartographer) is important for the development and successful application of the programs. Finally, the possibility of generating three-dimensional geological surface visualizations based on the same cartographic data is shown. Area polygons of the geological formations are merged with a digital height model resulting in surface facettes which are coloured according to these features. This surface model can be shaded and visualized from different angles using a standard rendering software. These visualizations offer the user of two-dimensional geological maps additional possibilities for interpretation and they can even be used interactively during the map modelling process.Numéro de notice : 14040 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Monographie Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=62594 Réservation
Réserver ce documentExemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 14040-01 37.40 Livre Centre de documentation Géomatique Disponible