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Panoramic imaging and virtual reality : filling the gaps between the lines / D. Chapman in ISPRS Journal of photogrammetry and remote sensing, vol 53 n° 6 (November - December 1998)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 53 n° 6 (November - December 1998) . - pp 311 - 319 Titre : Panoramic imaging and virtual reality : filling the gaps between the lines Type de document : Article/Communication Auteurs : D. Chapman, Auteur ; A. Deacon, Auteur Année de publication : 1998 Article en page(s) : pp 311 - 319 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image [Termes IGN] image panoramique [Termes IGN] logiciel de dessin [Termes IGN] modélisation 3D [Termes IGN] objet géographique [Termes IGN] objet géographique complexe [Termes IGN] réalité virtuelle [Termes IGN] visualisation 3D [Termes IGN] VRML Résumé : (Auteur) Close range photogrammetry projects rely upon a clear and unambiguous specification of end-user requirements to inform decisions relating to the format, coverage, accuracy and complexity of the final deliverable. Invariably such deliverables will be a partial and incomplete abstraction of the real world where the benefits of higher accuracy and increased complexity must be traded against the cost of the project. As photogrammetric technologies move into the digital era, computerisation offers opportunities for the photogrammetrist to revisit established mapping traditions in order to explore new markets. One such market is that for three-dimensional Virtual Reality (VR) models for clients who have previously had little exposure to the capabilities, and limitations, of photogrammetry and may have radically different views on the cost/benefit trade-offs in producing geometric models. This paper will present some examples of the authors' recent experience of such markets, drawn from a number of research and commercial projects directed towards the modelling of complex man-made objects. This experience seems to indicate that suitably configured digital image archives may form an important deliverable for a wide range of photogrammetric projects and supplement, or even replace, more traditional CAD models. Copyright ISPRS Numéro de notice : A1998-244 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/S0924-2716(98)00016-1 En ligne : https://doi.org/10.1016/S0924-2716(98)00016-1 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29436 [article]

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Statistical analysis of two 3-D registration and modeling strategies / O. Jokinen in ISPRS Journal of photogrammetry and remote sensing, vol 53 n° 6 (November - December 1998)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 53 n° 6 (November - December 1998) . - pp 320 - 341 Titre : Statistical analysis of two 3-D registration and modeling strategies Type de document : Article/Communication Auteurs : O. Jokinen, Auteur ; Henrik Haggren, Auteur Année de publication : 1998 Article en page(s) : pp 320 - 341 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image [Termes IGN] contrôle statistique [Termes IGN] matrice de covariance [Termes IGN] modélisation 3D [Termes IGN] propagation d'erreur [Termes IGN] superposition d'images [Termes IGN] test statistique Résumé : (Auteur) The paper deals with the registration and modeling of multiple 3-D profile maps acquired from different viewpoints by light striping. We analyze the propagation of measurement and calibration errors to the registration parameters and further to the reconstructed model of the scene consisting of planar patches. The analysis is performed for two strategies. In the first strategy, the maps are registered simultaneously using the Levenberg-Marquardt method to update the registration parameters and the model computed afterwards while in the second one, the maps are registered sequentially against the model reconstructed up till then using the method of unit quatemions to update the registration parameters. Our statistical analysis thus combines the registration and modeling steps, and in registration, we determine the corresponding points either on the parametric domains of the maps or as closest points in 3-D using the information from the parametric domain to restrict the search for the closest points. We also point out the precise estimation of the covariance matrix of the solution given by the Levenberg-Marquardt method. We illustrate the results of our analysis with real data from a scale model of an urban area. Copyright ISPRS Numéro de notice : A1998-245 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/S0924-2716(98)00017-3 En ligne : https://doi.org/10.1016/S0924-2716(98)00017-3 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29437 [article]

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Geometrically valid pixel reprojection methods for novel view synthesis / S.B. Kang in ISPRS Journal of photogrammetry and remote sensing, vol 53 n° 6 (November - December 1998)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 53 n° 6 (November - December 1998) . - pp 342 - 353 Titre : Geometrically valid pixel reprojection methods for novel view synthesis Type de document : Article/Communication Auteurs : S.B. Kang, Auteur Année de publication : 1998 Article en page(s) : pp 342 - 353 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image [Termes IGN] algèbre bilinéaire [Termes IGN] réalité virtuelle [Termes IGN] rendu réaliste [Termes IGN] synthèse d'image [Termes IGN] tenseur Numéro de notice : A1998-246 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/S0924-2716(98)00018-5 En ligne : https://doi.org/10.1016/S0924-2716(98)00018-5 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29438 [article]

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3D reconstruction from a single image using geometric constraints / Frank van den Heuvel in ISPRS Journal of photogrammetry and remote sensing, vol 53 n° 6 (November - December 1998)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 53 n° 6 (November - December 1998) . - pp 354 - 368 Titre : 3D reconstruction from a single image using geometric constraints Type de document : Article/Communication Auteurs : Frank van den Heuvel, Auteur Année de publication : 1998 Article en page(s) : pp 354 - 368 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image [Termes IGN] compensation par faisceaux [Termes IGN] modélisation 3D [Termes IGN] monument historique [Termes IGN] polyèdre [Termes IGN] réalité virtuelle [Termes IGN] reconstruction 3D du bâti [Termes IGN] texture d'image [Termes IGN] visualisation 3D Résumé : (Auteur) Photogrammetry has many advantages as a technique for the acquisition of three-dimensional models for virtual reality. But the traditional photogrammetric process to extract 3D geometry from multiple images is often considered too labour-intensive. In this paper a method is presented with which a polyhedral object model can be efficiently derived from measurements in a single image combined with geometric knowledge on the object. Man-made objects can often be described by a polyhedral model and usually many geometric constraints are valid. These constraints are inferred during image interpretation or may even be extracted automatically. In this paper different types of geometric constraints and their use for object reconstruction are discussed. Applying more constraints than needed for reconstruction will lead to redundancy and thereby to the need for an adjustment. The redundancy is the basis for reliability that is introduced by testing for possible measurement errors. The adjusted observations are used for object reconstruction in a separate step. Of course the model that is obtained from a single image will not be complete, for instance due to occlusion. An arbitrary number of models can be combined using similarity transformations based on the coordinates of common points. The information gathered allows for a bundle adjustment if highest accuracy is strived for. In virtual reality applications this is generally not the case, as quality is mainly determined by visual perception. A visual aspect of major importance is the photo-realistic texture mapped to the faces of the object. This texture is extracted from the same (single) image. In this paper the measurement process, the different types of constraints, their adjustment and the object model reconstruction are treated. A practical application of the proposed method is discussed in which a texture mapped model of a historic building is constructed and the repeatability of the method is assessed. The application shows the feasibility of the method and the potential of photogrammetry as an efficient tool for the production of 3D models for virtual reality applications. Copyright ISPRS Numéro de notice : A1998-247 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/S0924-2716(98)00019-7 En ligne : https://doi.org/10.1016/S0924-2716(98)00019-7 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29439 [article]

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Generation and visualization of 3D photo-models using hybrid block adjustment with assumptions on the object shape / L. Dorffner in ISPRS Journal of photogrammetry and remote sensing, vol 53 n° 6 (November - December 1998)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 53 n° 6 (November - December 1998) . - pp 369 - 378 Titre : Generation and visualization of 3D photo-models using hybrid block adjustment with assumptions on the object shape Type de document : Article/Communication Auteurs : L. Dorffner, Auteur ; G. Forkert, Auteur Année de publication : 1998 Article en page(s) : pp 369 - 378 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image [Termes IGN] compensation par bloc [Termes IGN] compensation par faisceaux [Termes IGN] modèle géométrique [Termes IGN] modélisation 3D [Termes IGN] photogrammétrie métrologique [Termes IGN] réalité virtuelle [Termes IGN] texture d'image [Termes IGN] visualisation 3D [Termes IGN] VRML Résumé : (Auteur) Three-dimensional photo-models are object models with texture information taken from photographs. They can be used, among other things, to present structural projects to the public and decision-makers. The geometrical modeling of our photo-model is supported by assumptions on the object shape. These assumptions are introduced as fictitious feature observations into the process of hybrid bundle block adjustment. The resulting geometrical model is then filled with texture by projecting the original photographs onto it. A suitable data format for such purposes is VRML (Virtual Reality Modeling Language) because such three-dimensional photo-models can be made available over the Internet. In addition, they can be combined very easily with other media such as texts, sounds, images, movies and, because of that, may serve as a basis for information systems. Copyright ISPRS Numéro de notice : A1998-248 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/S0924-2716(98)00020-3 En ligne : https://doi.org/10.1016/S0924-2716(98)00020-3 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29440 [article]

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A multi-sensor approach to creating accurate virtual environments / Sabry F. El Hakim in ISPRS Journal of photogrammetry and remote sensing, vol 53 n° 6 (November - December 1998)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 53 n° 6 (November - December 1998) Titre : A multi-sensor approach to creating accurate virtual environments Type de document : Article/Communication Auteurs : Sabry F. El Hakim, Auteur ; Claus Brenner, Auteur ; G. Roth, Auteur Année de publication : 1998 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image [Termes IGN] chambre DTC [Termes IGN] compensation par faisceaux [Termes IGN] données multicapteurs [Termes IGN] modèle 3D de l'espace urbain [Termes IGN] monde virtuel [Termes IGN] réalité virtuelle [Termes IGN] rendu réaliste [Termes IGN] texture d'image [Termes IGN] visualisation 3D [Termes IGN] voxel Résumé : (Auteur) Creating virtual environment models often requires geometric data from range sensors as well as photometric data from CCD cameras. The model must be geometrically correct, visually realistic, and small enough in size to allow real-time rendering. We present an approach based on 3D range sensor data, multiple CCD cameras, and a colour high-resolution digital still camera. The multiple CCD cameras provide images for a photogrammetric bundle adjustment with constraints. The results of the bundle adjustments are used to register the 3D images from the range sensor in one coordinate system. The images from the high-resolution still camera provide the texture for the final model. The paper describes the system, the techniques for the registration of the 3D images, the building of the efficient geometric model, and the registration and integration of the texture with a simplified geometric model. Copyright ISPRS Numéro de notice : A1998-249 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/S0924-2716(98)00021-5 En ligne : https://doi.org/10.1016/S0924-2716(98)00021-5 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29441 [article]

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