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3D reconstruction methods based on the rational function model / C. Vincent Tao in Photogrammetric Engineering & Remote Sensing, PERS, vol 68 n° 7 (July 2002)
[article]
Titre : 3D reconstruction methods based on the rational function model Type de document : Article/Communication Auteurs : C. Vincent Tao, Auteur ; Y. Hu, Auteur Année de publication : 2002 Article en page(s) : pp 705 - 714 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique
[Termes IGN] correction d'image
[Termes IGN] image à résolution métrique
[Termes IGN] image Ikonos
[Termes IGN] modèle par fonctions rationnelles
[Termes IGN] orthorectification
[Termes IGN] reconstruction 3D
[Termes IGN] stéréoscopieRésumé : (Auteur) The rational function model (RFM) is an alternative sensor model allowing users to perform photogrammetric processing. The RFM has been used as a replacement sensor model in some commercial photogrammetric systems due to its capability of maintaining the accuracy of the physical sensor models and its generic characteristic of supporting sensor-independent photogrammetric processing. With RFM parameters provided, end users are able to perform photogrammetric processing including ortho-rectification, 3D reconstruction, and DEM generation with an absence of the physical sensor model. In this research, we investigate two methods for RFM-based 3D reconstruction, the inverse RFM method and the forward RFM method. Detailed derivations of algorithmic procedure are described. The emphasis is placed on the comparison of these two reconstruction methods. Experimental results show that the foward RFM can achieve a better reconstruction accuracy. Finally, real Ikonos stereo pairs were employed to verify the applicability and the performance of the reconstruction method. Numéro de notice : A2002-368 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : sans En ligne : https://www.semanticscholar.org/paper/3D-Reconstruction-methods-based-on-the-rat [...] Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22280
in Photogrammetric Engineering & Remote Sensing, PERS > vol 68 n° 7 (July 2002) . - pp 705 - 714[article]3D building models using laser scanning: creating a building information system: the ancient cathedral of Bergamo / Luigi Colombo in GIM international, vol 16 n° 5 (May 2002)
[article]
Titre : 3D building models using laser scanning: creating a building information system: the ancient cathedral of Bergamo Type de document : Article/Communication Auteurs : Luigi Colombo, Auteur ; Barbara Marana, Auteur Année de publication : 2002 Article en page(s) : pp 32 - 35 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie
[Termes IGN] Bergame
[Termes IGN] capteur imageur
[Termes IGN] cathédrale
[Termes IGN] coordonnées cartésiennes
[Termes IGN] correction géométrique
[Termes IGN] données laser
[Termes IGN] lasergrammétrie
[Termes IGN] modélisation 3D
[Termes IGN] ombre
[Termes IGN] photogrammétrie architecturale
[Termes IGN] reconstruction 3D du bâti
[Termes IGN] semis de points
[Termes IGN] télémètre laser terrestre
[Termes IGN] télémétrie laser terrestre
[Termes IGN] texture d'imageNuméro de notice : A2002-232 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22146
in GIM international > vol 16 n° 5 (May 2002) . - pp 32 - 35[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 061-02051 RAB Revue Centre de documentation Revues en salle Disponible vol 64 n° 2 - March 2002 - Ninth Pacific graphics conference (PG 2001), [actes], Tokyo, 16 - 18 October 2001 (Bulletin de Graphical models) / H. Suzuki
[n° ou bulletin]
Titre : vol 64 n° 2 - March 2002 - Ninth Pacific graphics conference (PG 2001), [actes], Tokyo, 16 - 18 October 2001 Type de document : Périodique Auteurs : H. Suzuki, Éditeur scientifique ; et al., Auteur Année de publication : 2002 Conférence : PG 2001, 9th Pacific graphics conference 16/10/2001 18/10/2001 Tokyo Japon Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image
[Termes IGN] modélisation géométrique de prise de vue
[Termes IGN] partition de surface
[Termes IGN] reconstruction d'objetNuméro de notice : 095-0202 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Numéro de périodique Permalink : https://documentation.ensg.eu/index.php?lvl=bulletin_display&id=14350 [n° ou bulletin]
Titre : 3D-Erfassung und Objektrekonstruktion mittels Streifenprojektion Titre original : [Saisie 3D et reconstruction d'objet au moyen de la projection par bandes] Type de document : Thèse/HDR Auteurs : Jens Guhring, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 2002 Collection : DGK - C Sous-collection : Dissertationen num. 560 Importance : 166 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-9599-1 Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique
[Termes IGN] méthode robuste
[Termes IGN] modèle mathématique
[Termes IGN] reconstruction 3DIndex. décimale : 33.30 Photogrammétrie numérique Résumé : (Auteur) The digitization of physical objects using optical shape acquisition methods is gaining increasing importance. Nowadays, there are a lot of applications in many different fields like industrial inspection, reverse engineering, virtual reality and medicine. Due to the improvements in sensor architecture and data processing, the acquisition of objects of almost any complexity became possible.
Active research during the last decades led to a variety of working shape acquisition systems worldwide. They differ in the measurement principle, efficiency and the degree of automatization. What almost all systems have in common is the missing or inadequate consideration of accuracy and reliability aspects.
This thesis addresses the problem of surface acquisition and reconstruction using active optical triangulation. Compared to other systems, data quality is treated rigorously in all processing steps. In order to achieve this goal new methods or important extensions of existing methods have been developed. The necessary steps are :
Data acquisition using structured light. Calibration and modeling of cameras and projectors is achieved by adapting well-established methods of digital close range photogrammetry to fringe projection systems. New pattern designs in combination with advanced processing methods allow for higher flexibility without introducing systematic measurement errors, as they are inherent in traditional methods. Results of the process are the geometric positions of the measured points, as well as, their covariance matrix and additional attributes like color or surface reflectivity.
Transformation of datasets into a common coordinate frame. This so-called registration step is necessary since almost any measurement task requires multiple measurements from different viewpoints due to unavoidable occlusions. Algorithms for pairwise registration as well as algorithms for the simultaneous registration of multiple datasets and registration using surface reflectivity information have been investigated. All methods are modified versions of the well-known iterative closest point (ICP) algorithm and make use of covariance information provided by the data acquisition step. This information is used during the pose estimation process. A new stochastic model, which takes into consideration how point correspondences are computed, tremendously improves convergence compared to the classical ICP algorithm.
The integration of registered datasets. This step modifies the topology of the measured points to yield a seamlessly integrated surface description.
For measurement tasks in industrial inspection, the deviation between a manufactured part and its CAD description is necessary (actual/nominal comparison). The uncertainty of the reconstructed surface is used to decide whether a measured deviation is significant and if the measurements are precise enough to detect small defects.
The realized system allows for the digitization of complex objects using millions of points. By the integration of accuracy and reliability aspects in all steps of the processing chain the robustness of the system has been considerably improved.Numéro de notice : 13162 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Thèse étrangère DOI : sans En ligne : https://www.ifp.uni-stuttgart.de/dokumente/Dissertationen/guehring_c-560.pdf Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=54899 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 13162-01 33.30 Livre Centre de documentation Photogrammétrie - Lasergrammétrie Disponible
Titre : 3D terrain models on the basis of a triangulation Type de document : Thèse/HDR Auteurs : Norbert Pfeifer, Auteur Editeur : Vienne [Autriche] : Technische Universität Wien Année de publication : 2002 Collection : Geowissenschaftliche Mitteilungen, ISSN 1811-8380 num. 65 Importance : 142 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-9500791-7-3 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique
[Termes IGN] données localisées 3D
[Termes IGN] interpolation
[Termes IGN] modèle numérique de terrain
[Termes IGN] noeud
[Termes IGN] reconstruction 3D
[Termes IGN] triangulation de DelaunayRésumé : (Auteur) This work provides an overview on terrain modelling techniques. Terrain models, or in order to be more general, topographic surface models, play an important role in many fields of science and practice where a relation to a location, i.e. a geo-relation' is given. These models describe the height as a function of the location. There lies a restriction in this definition, because only one height is allowed at one ground-plane position. Therefore, the currently used models are often termed 2.5D terrain models. The modelling of overhangs is not possible within such an approach. The aim of this work is to put aside this limitation and provide methods for 3D terrain modelling where not only the above restrictions do not apply anymore, but also more general surfaces with tunnels and cave systems can be reconstructed. Another terrain property which plays an important role in this work is its smoothness: a model shall be smooth. An exception is introduced at so-called breaklines where the terrain shape has a sharp edge.
There are several ways in order to build terrain models with the above characteristics (fully 3D and smooth). In this work, emphasis is put on those approaches which reconstruct the surface on the basis of a triangulation. Two different techniques are treated with great detail: the patch work and the subdivision approach. For each of those two, one method was developed which considers the special requirements in terrain modelling. The main contribution of this work to terrain modelling are those new methods. Generation, improvement, and thinning of triangulations is not treated within this work, but references to the relevant literature are given. Generally, the reconstruction of a patch work proceeds as follows. Given is a triangulation, which has as expected planar faces. For each edge a curve is determined which interpolates the end points. In the next step, triangular patches are inserted into a triple of boundary curves spanned over the edges of each triangle. As the patches interpolate the boundary curve a G0 surface (a geometrically continuous surface) is obtained.
However, this is not enough, because a smooth surface (G1, geometric continuity of order one, i.e. tangent plane continuity) is desired. Adjacent patches must therefore interpolate not only the boundary curves, but also share a common field of cross boundary derivatives. This is the general approach for patch work surfaces.
The patch work method which is proposed in this work1 starts with an enhancement of the triangulation. As the measurement of terrain points and lines is always burdened with random errors (depending on the measurement device characteristics) these errors should be removed first. This can be achieved by kriging, whereby for each point of the triangulation (i.e. each vertex) a filter value is determined from its neighboring points. In this step also the surface normal vectors in the points can be estimated, but alternative methods for the estimation of the normal vector, e.g. by averaging those of the triangles which are incident to that vertex, are possible, too. Now, not only the position, but also the surface normal vector is prescribed for each vertex. The patches which are to be reconstructed over each face of the triangulation shall be polynomials of degree four and they are described with Beziér triangles which allow a geometric interpretation of the coefficients of the (bivariate) polynomial. In the next step, boundary curves of polynomial degree three are computed which replace' the edges of the triangulation. These curves interpolate the end points of the edge and the curve tangents in those points are perpendicular to the estimated normal vectors. This determines the boundaries of each patch. The missing parameters (i.e. coefficients of the polynomial) influence the shape in the interior of the patch and also the tangent planes of the patch along the boundaries. A field of normal vectors is estimated for each boundary curve by blending the normal vectors from the end points into each other. The inner' parameters of a patch are now determined in a way that the normal vector fields are approximately perpendicular to the tangent planes of the patch along the boundaries in a least squares sense. As this field is only' approximated and not interpolated this scheme is called "G1 (i.e. approximately tangent plane continuous).
The second technique for surface reconstruction over a triangulation is the so-called subdivision. In this approach the given triangulation is refined in steps, and in each step new vertices and edges are inserted into the triangulation. This is performed in a way that the smoothness of the triangulation is increased in each level, the angles between adjacent triangles converge towards 180_. The limit surface, reached after an infinite number of subdivision steps, is smooth. An advantage of this approach is that the surface description is always composed of small triangles which allows to apply simple algorithms for intersections and similar tasks. The size of the triangles depends on the number of subdivision steps (i.e. the refinement level). This is the general approach for subdivision surfaces.
Also in the reconstruction technique (developed in this work) for topographic surfaces which is based on subdivision a removal of random measurement errors has to be performed first. The refinement rule applied here is the so-called edge midpoint subdivision where in one step one vertex is inserted into each edge and the triangulation is updated. The subdivision is based on the estimation of local surfaces in each vertex. A local surface is estimated which approximates the vertex of interest and its neighbors. The co-ordinates of the new points are obtained by averaging the two local surfaces in either edge end point. To achieve this, a point, representative for the edge midpoint, is computed on both local surfaces and the mean of these two is the new point. Also the old' points obtain new co-ordinates, namely their position on the local approximating surfaces. Special modifications are introduced in order to interpolate the originally given points. The approaches are compared to each other with examples based on real photogrammetric and geodetic observations as well as on synthetic terrain data. It turns out that the surfaces obtained by the developed subdivision approach meet the requirements in topographic terrain modelling better.Note de contenu : 1 Introduction
2 Modelling of Topographic Surfaces
2.1 Types of Models
2.1.1 Contour lines
2.1.2 Bivariate functions
2.1.3 Volumetric models
2.1.4 Transformation between models
2.2 Global and local approaches
2.3 Models in 2.5D and in 3D
2.4 3D terrain models
2.4.1 Problem definition
3 Algorithms for Triangulations
3.1 Definition of neighborhood
3.2 Parameterization of triangulations
3.2.1 Projection onto a plane
3.2.2 Local projection onto a plane
3.2.3 Global parameterizations
3.2.4 A method for local parameterization
3.3 Surface approximation and estimation of geometric properties
3.3.1 Normal vectors and tangent planes
3.3.2 Approximating quadric as local surface description
3.3.3 Approximating second order polynomial as local surface description
3.4 Functionals and variational principle
3.5 Mesh improvement
3.6 Filtering of random measurement errors
3.7 Consideration of breaklines and special points
3.7.1 Neighborhood restrictions
3.7.2 Prescribed tangent planes
3.7.3 Surfaces and lines at special points
4 Parametric patches
4.1 Patches and patch work
4.2 Method overview
4.3 An "G1-continuous polynomial patch
4.3.1 Approximate continuity
4.3.2 Construction of a curve network
4.3.3 Insertion of patches
4.3.4 Insertion of patches and minimizing energy
4.3.5 Additional splitting
4.3.6 Results
5 Subdivision
5.1 The subdivision paradigm
5.2 Method overview
5.3 Subdivision by estimation of local surfaces
5.3.1 The curve case
5.3.2 Surface subdivision with approximating surfaces
5.3.3 Paraboloids vs. general quadrics as local surfaces
5.3.4 Paraboloids vs. second order polynomials as local surfaces
5.3.5 Interpolation and Approximation
5.3.6 Averaging
5.3.7 Roughness detection
5.3.8 Results
6 Examples
6.1 Vertical Wall
6.2 Data set “Elev”
6.3 Breaklines only
6.4 Data set “Albis”
6.5 Bridge
7 Conclusions and Perspectives
7.1 Applications
7.2 Enclaves
7.3 Concluding remarkNuméro de notice : 14314 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Thèse étrangère Note de thèse : PhD : Vermessung und Geoinformation : Technische Universität Wien : 2002 En ligne : https://repositum.tuwien.at/handle/20.500.12708/390?mode=simple Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=62656 PermalinkAnalyse de données acquises par laser aéroporté pour la reconstruction 3D de scènes urbaines / R. Elkharroubi (2002)PermalinkAnalyse d'images aériennes haute résolution pour la reconstruction de scènes urbaines / Matthieu Cord in Bulletin [Société Française de Photogrammétrie et Télédétection], n° 166 (Janvier 2002)PermalinkDéveloppement d'une approche figurale pour la radargrammétrie haute résolution en zone urbaine / Florence Tupin in Bulletin [Société Française de Photogrammétrie et Télédétection], n° 166 (Janvier 2002)PermalinkExtracting 3D edgels hypotheses from multiple calibrated images : a step towards the reconstruction of curved and straight object boundary lines / Franck Jung (2002)PermalinkExtraction of 3D primitives from stereopairs of satellite images for automatic reconstruction of buildings / Nesrine Chehata (2002)PermalinkPermalinkReconstruction 3D de sites urbains par stéréoscopie optique haute résolution / Hélène Oriot in Bulletin [Société Française de Photogrammétrie et Télédétection], n° 166 (Janvier 2002)PermalinkReconstruction automatique des bâtiments en modèles polyédriques 3-D à partir de données cadastrales vectorisées 2D et d'un couple d'images aériennes à haute résolution / Hassan Jibrini (2002)PermalinkReconstruction of 3D linear primitives from multiple views for urban areas modelisation / Franck Taillandier (2002)Permalink