Détail d'une collection
Documents disponibles dans la collection (466)
Ajouter le résultat dans votre panier
Visionner les documents numériques
Affiner la recherche Interroger des sources externes
Klassifikation und Interpolation mittels affin invarianter Voronoidiagramme auf der Basis eines Wahrscheinlich- keitsmaßes in großmaßstäbigen Geoinformationssystemen / R. Roschlaub (1999)
Titre : Klassifikation und Interpolation mittels affin invarianter Voronoidiagramme auf der Basis eines Wahrscheinlich- keitsmaßes in großmaßstäbigen Geoinformationssystemen Titre original : [Classification et interpolation au moyen d'un diagramme de Voronoi affine et invariant sur la base d'une mesure de vraisemblance dans un système d'information géographique à grande échelle] Type de document : Thèse/HDR Auteurs : R. Roschlaub, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 1999 Collection : DGK - C Sous-collection : Dissertationen num. 509 Importance : 90 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-9547-2 Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique
[Termes IGN] classification par maximum de vraisemblance
[Termes IGN] diagramme de Voronoï
[Termes IGN] modèle linéaire
[Termes IGN] Projection de Soldner
[Termes IGN] projection Universal Transverse Mercator
[Termes IGN] théorie des graphes
[Termes IGN] transformationIndex. décimale : 33.30 Photogrammétrie numérique Résumé : (Auteur) Empirical results form the basis of a prototype for transformation and interpolation of massdata in a geoinformatic system. The empirical researches of the new approach for classification and interpolation deal with the following three cases of continuation : 1- the transformation between Soldner- and Gauß-Krüger-Coordinates, 2- continuation of Gauß-Krüger-Coordinates according to GPS measurements and 3- continuation of digitized maps based on official Gauß-Krüger-Coordinates. For this new prototype, a new theoretical approach for a transformation based on affin invariant Voronoi-Graphs is presented. For this purpose, the basics of a new classification procedure are explained and a method for faithful interpolation in neighborhood of masspoints is given. The new approach is a general method for transformation and interpolation of scattered massdata and might be used in geoinformatic systems as well as in related geodetic terms of reference. The new developed classification procedure uses a mixture density model to formulate a strict size of probability according to the theory of probability. Here, the problem of class division is solved for the first time by means of the EM-Algorithm which gains more and more acceptance in statistics. In order to determine the transformation parameters of each class, a new developed QR-Decomposition is applied, enabling a solution to all common problems of minimization explicitly. The according cofactor matrices might be determined by a consistent presentation as well. Numéro de notice : 56340 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Thèse étrangère Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=60009 Réservation
Réserver ce documentExemplaires(2)
Code-barres Cote Support Localisation Section Disponibilité 56340-01 33.30 Livre Centre de documentation Photogrammétrie - Lasergrammétrie Disponible 56340-02 33.30 Livre Centre de documentation Photogrammétrie - Lasergrammétrie Disponible Segmentierung und Interpretation digitaler Bilder mit Markoff-Zufallsfeldern / J. Klonowski (1999)
Titre : Segmentierung und Interpretation digitaler Bilder mit Markoff-Zufallsfeldern Titre original : [Segmentation and interpretation of digital images using Markov random fields] Type de document : Thèse/HDR Auteurs : J. Klonowski, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 1999 Collection : DGK - C Sous-collection : Dissertationen num. 492 Importance : 91 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-9532-8 Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Traitement d'image optique
[Termes IGN] analyse de groupement
[Termes IGN] analyse texturale
[Termes IGN] champ aléatoire de Markov
[Termes IGN] distribution de Gibbs
[Termes IGN] image multibande
[Termes IGN] milieu urbain
[Termes IGN] segmentation d'image
[Termes IGN] théorème de Bayes
[Termes IGN] varianceIndex. décimale : 35.20 Traitement d'image Résumé : (Auteur)This thesis defines and solves the problem of the interpretation of digital images by labeling processes on two levels based on Markov random fields. Under the assumption that the objects to be identified in the image differ by their textures, pixels are labeled at the low level according to their affiliation to classes of textures. Clusters of pixels with identical labels are forming regions. They are labeled at the high level of the image analysis to obtain the meaning of the objects. Uncertainties are considered by variances for the description of textures and objects as well as by the probabilistic approach for the labeling.
The textures at the low level are represented by the Gibbs distribution of the Markov random field for the gray values. Prior information on the labels concerning the textures is introduced by the Gibbs distribution of the Markov random field of the labels. Application of Bayes' theorem joins the two densities to the posterior distri-bution. Its maximization at every pixel yields the labels for the textures. Also on the basis of Markov random fields a description for the existing and the expected objects is obtained at the high level of image analysis. Prior information on the unknown object labels consists of the frequency of the occurence of objects and their neighborhood relations. Maximization of the posterior density leads to the labels. Uncertain interpretations of regions are found by posterior odds for hypotheses. The label "unknown" is attributed to them.
The quality of the interpretation is mainly influenced by the segmentation at the low level. Therefore an in-teraction between the two levels on the basis of posterior odds has been realized. The percentage of area of the regions labeled "unknown" is used as an indicator for improving the segmentation, which leads to a better result for the interpretation.
The texture classification is first investigated by generated data for a/ better judgement of the influences of the choice of the parameters for the distributions. The experience gained is used in the segmentation of real multispectral aerial photographs. Tests of a color transformation and an image pyramid of the image data with respect to the quality of the symbolic description of the image are following. Finally the interaction between the two interpretation levels is tested on aerial multispectral photographs of urban areas.Numéro de notice : 28003 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Thèse étrangère Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=63350 Réservation
Réserver ce documentExemplaires(2)
Code-barres Cote Support Localisation Section Disponibilité 28003-01 35.20 Livre Centre de documentation Télédétection Disponible 28003-02 35.20 Livre Centre de documentation Télédétection Disponible Simultane Neuausgleichung des globalen 3D-Mars-Netzes / W. Zeitler (1999)
Titre : Simultane Neuausgleichung des globalen 3D-Mars-Netzes Titre original : [Nouvelle compensation simultanée du réseau global tridimensionnel de Mars] Type de document : Thèse/HDR Auteurs : W. Zeitler, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 1999 Collection : DGK - C Sous-collection : Dissertationen num. 511 Importance : 75 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-9549-6 Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Astrophysique
[Termes IGN] compensation par bloc
[Termes IGN] compensation par faisceaux
[Termes IGN] Mars (planète)
[Termes IGN] PathFinder
[Termes IGN] réseau géodésique tridimensionnel
[Termes IGN] valeur efficaceIndex. décimale : 31.20 Astrophysique Résumé : (Auteur) For future missions and other scientific purposes on Mars the existing global control point network was readjusted. This network consists of a large number of surface features which can be seen in the images, whereas their object co-ordinates were photogrametrically derived by using images of the Viking missions to Mars.
In the context of new missions to the Red Planet, many input parameters of the global bundle block adjustment like the gravitational field of Mars, the Viking orbit information of the spacecrafts and the occultation data, were newly analysed. Additionally, the Pathfinder mission in 1997 provides with its successful lander- a new ground control point and with the help of the communication radio signal new and accurate estimates of the rotational parameters of Mars. All this datasets are influencing directly the object co-ordinates of the surface landmarks and their accuracy, so it was necessary to recompute and update the global control point network using this new information. Due to the today's computer power a simultaneous processing of all input parameters was possible to ensure a consistent handling of the data and to get high accuracy of the ground co-ordinates.
Within a bundle block adjustment 7 parameters of the interior orientation, the positions and attitude angles of 1140 images and the object co-ordinates of 3739 points were estimated. The mathematical model of this photogrammetric adjustment is based on the collinearity equations, where the positions of the images are treated independently from each other. The rms values of the theoretical standard deviation of the adjusted ground co-ordinates amount to 740 m, which is a significant improvement compared with former results (1 5 km). The accuracy of the ground point co-ordinates is very close to the theoretical accuracy limit of 520 m, where error-free orientation parameters are assumed. Using the data in the present case, no additional increasement of the accuracy can be achieved.
The datasets were furthermore used as input for a bundle block adjustment with orbital constraints. In this case the orbit trajectory of the spacecraft will be estimated instead of the single image positions which are a function of that trajectory. This ensures the proper handling of the position data, all images taken in one orbit are lying on a physical consistent trajectory. The global adjustment was performed using this new adjustment approach, but it was found out that the data are not suited for this special technique. Therefore no final results using orbital constraints were achieved.Numéro de notice : 57824 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Thèse étrangère Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=60287 Réservation
Réserver ce documentExemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 57824-01 31.20 Livre Centre de documentation En réserve M-103 Disponible Verfeinerung und objektorientierte Implementierung eines Modells zur Nutzung von Lasermessungen zum Mond / B. Reichhoff (1999)
Titre : Verfeinerung und objektorientierte Implementierung eines Modells zur Nutzung von Lasermessungen zum Mond Titre original : [Amélioration et mise en œuvre orientée objet d'un modèle pour l'utilisation de mesures laser Lune] Type de document : Thèse/HDR Auteurs : B. Reichhoff, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 1999 Collection : DGK - C Sous-collection : Dissertationen num. 512 Importance : 117 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-9550-2 Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] astéroïde
[Termes IGN] C++
[Termes IGN] implémentation (informatique)
[Termes IGN] Lune
[Termes IGN] mécanique céleste
[Termes IGN] système solaire
[Termes IGN] télémétrie laser sur la LuneIndex. décimale : 30.63 Télémétrie laser sur satellite, Télémétrie laser sur lune, VLBI Note de contenu : 1) Stand des programmpaketes LUNAR zu Beginn dieser Arbeit
2) Uberprüfung der numerischen Präzision von LUNAR
3) Objektorientierte Implementierung der neuen Version von LUNAR
4) Erweiterete nach-Newtonsche himmelsmechanische Bewegungsgleichungen für die Körper des Sonnensystems
5) Asteroidenstörungen der Mondbewegung
6) Genauere Lösung der Variationsgleichungen
7) Ergänzungen am Auswertemodell und -programmNuméro de notice : 42034 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Thèse étrangère Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=57938 Réservation
Réserver ce documentExemplaires(2)
Code-barres Cote Support Localisation Section Disponibilité 42034-02 30.63 Livre Centre de documentation Géodésie Disponible 42034-01 30.63 Livre Centre de documentation Géodésie Disponible Von der 2oeD- zur 3D-Flächenmodellierung für die photogrammetrische Rekonstruktion im Objektraum / W. Kornus (1999)
Titre : Von der 2oeD- zur 3D-Flächenmodellierung für die photogrammetrische Rekonstruktion im Objektraum Titre original : [De la modélisation de surfaces 2,5D à la modélisation 3D pour la reconstruction photogrammétrique dans l'espace objet] Type de document : Thèse/HDR Auteurs : W. Kornus, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 1999 Collection : DGK - C Sous-collection : Dissertationen num. 506 Importance : 135 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-9545-8 Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique
[Termes IGN] appariement d'images
[Termes IGN] données localisées 2,5D
[Termes IGN] espace objet
[Termes IGN] modélisation 3D
[Termes IGN] reconstruction 3D du bâtiIndex. décimale : 33.30 Photogrammétrie numérique Résumé : (Auteur) The thesis is based on the present state of the art of automatic photogrammetric surface reconstruction by multi-image matching in object space. This reconstruction approach can be characterised by the fact that any pixel gray value in image space is assumed to be an observation while formulating the quantities for describing the surface geometry and gray values in object space directly as unknown parameters and calculating the solution in the sense of a least squares' estimation. This very general method gives not only the possibility of a simultaneous matching of more than two images but also the broad spectrum of a complete multi-image approach: Ways for a simultaneous evaluation of data obtained from different optical sensors as well as for a simultaneous integration of multispectral and multitemporal image data are described in this thesis and illustrated by exemplary results of reconstruction.
An example given for the reconstruction of urban scenes from large-scale aerial images shows that a generalised surface representation in object space is necessary which allows vertical and even overhanging parts of the surface. Following the requirements of the photogrammetric multi-image matching, such a generalized 3-d surface model is set up and discussed in connection with the present developments in the fields of Computer Graphics and Computer Aided Geometric Design. More concretely, an irregular triangular mesh in R' is used as an explicit topological basis. This topological description is completed by transfinite, visually continuous, triangular interpolants, which allow continuity degrees from zeroth up to second order for the resulting 3-d surface model. The concept of transfinite triangular interpolation applies also to the representation of the surface gray values.
The reconstruction itself is obtained on the basis of hierarchical multigrids in object space and image pyramids in image space, respectively. Thus, the geometric surface description becomes more and more differentiated in the course of the reconstruction procedure. Formulation of the generalized 3-d reconstruction approach is made by means of the local surface normal vectors, in order to indicate the directions of the surface displacements during an iteration step of the reconstruction procedure. A permanent, explicit detection of occlusion, or here visibility in the proper sense, is integrated within the reconstruction process. Numerical topics are also treated, especially as they are of interest with respect to acceptable computation times.
The test of the reconstruction approach on the basis of the new 3-d surface modelling proves that the photogrammetric multi-image matching can profit from the generalized surface model. Exemplary reconstruction results which have been calculated using the new 3-d surface model on the one hand and the classical surface model of the form Z = f (X, Y) on the other hand are compared to each other. Scenes of open terrain show the expected comparable results, but for urban scenes a considerable increase in geometric quality of the reconstruction result could be found using the 3-d surface model.
The newly formulated 3-d surface model allows to eliminate the modelling deficits that have existed so far concerning the reconstruction of general surfaces within W. The increases in geometric quality should considerably simplify subsequent tasks like the detection and reconstruction of buildings. Furthermore, the application of the generalized photogrammetric reconstruction procedure seems to be very promising for the applicational fields of industrial and close-range photogrammetry.
Recent publications in the English language concerning various aspects of multi-image matching in object space are given by [Schlüter and Wrobel 1996] and [Wrobel and SchIüter 1997], whereas [Schlüter 1994], [Schlüter 1998] concentrate on the improvement of surface modelling in object space with respect to photogrammetric reconstruction.Numéro de notice : 46108 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Thèse étrangère Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=58468 Réservation
Réserver ce documentExemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 46108-01 33.30 Livre Centre de documentation Photogrammétrie - Lasergrammétrie Disponible Zur Geokinematik im sächsischen Vogtland / J. Wendt (1999)PermalinkAnwendungen der satellitengestützten Radarinterferometrie zur Bestimmung von Topographie und Geschwindig-keitsfeldern / X. Wu (1998)PermalinkAusgleichung mit singulärer Varianzkovarianzmatrix am Beispiel der geometrischen Deformationsanalyse / G. Nkuite (1998)PermalinkAutomatische Objektextraktion aus digitalen Luftbildern / Helmut Mayer (1998)PermalinkBestimmung von Oberflächengeometrie, Punktbewegungen und Geoid in einer Region der Antarktis / W. Korth (1998)PermalinkDatenmodellierung für Gleisnetze und Schaffung eines einheitlichen Raumbezugssystems / F. Gielsdorf (1998)PermalinkEine neue Methode zur dreidimensionalen Radarabbildung von Oberflächen / M. Hohmann (1998)PermalinkEntwicklung und Erprobung eines Systems zur objektbezogenen tachymetrischen Datenerfassung mittels Telemetrie / A. Schluchter (1998)PermalinkExtraktion polymorpher Bildstrukturen und ihre topologische und geometrische Gruppierung / C. Fuchs (1998)PermalinkGeoidbestimmung mit geopotentiellen Koten / M. Feistritzer (1998)PermalinkGPS und GLONASS als Teil eines hybriden Meßsystems in der Geodäsie am Beispiel des Systems HIGGINS / A. Mathes (1998)PermalinkLasermessungen nach Erdsatelliten auf zwei Wellenlängen unter Verwendung einer Streak-Kamera / S. Riepl (1998)PermalinkOn the Unification of Indonesian Local Height Systems / Khafid (1998)PermalinkOrtung von eindeutig identifizierbaren Zielen und kodierten Transpondern / D. Hounam (1998)PermalinkRasterbasierte Methoden zur Gebäudeextraktion aus gescannten Karten / R. Brugelmann (1998)PermalinkThe curvilinear datum transformation / Francis Ifeanyi Okeke (1998)PermalinkPermalinkVerwendung und Bewertung von a-priori Information bei potentiell singulären Inversionsproblemen am Beispiel der gravimetrischen Bestimmung von Dichteverteilungen / P.L. Smilde (1998)PermalinkAnalyse und Vergleich unterschiedlicher Modelle der dreidimensionalen Geodäsie / U. Klein (1997)PermalinkAufbereitung und Nutzung von Pegelmessungen für geodätische und geodynamische Zielstellungen / G. Liebsch (1997)Permalink