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Titre : Automatische Extraktion von Straßen aus digitalen Luftbildern Titre original : [Extraction automatique des routes à partir d'images aériennes numériques] Type de document : Thèse/HDR Auteurs : Andreas Baumgartner, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 2003 Collection : DGK - C Sous-collection : Dissertationen num. 564 Importance : 78 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-5003-7 Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique
[Termes IGN] détection de contours
[Termes IGN] extraction du réseau routier
[Termes IGN] image numérisée
[Termes IGN] photographie aérienne
[Termes IGN] réseau routier
[Termes IGN] segmentation d'image
[Termes IGN] texture d'imageIndex. décimale : 33.30 Photogrammétrie numérique Résumé : (Auteur) This thesis proposes a new approach for the automatic extraction of roads from digital aerial imagery. It focuses on fully automatic extraction and uses an explicit object model. Compared to other approaches, the most prominent features of this thesis are the exploitation of the scale-space behavior of roads and the use of contextual information by means of global context regions and local relations between roads and other objects. The approach aims at road extraction in open rural areas. Panchromatic aerial images with a pixel size of approximately 0.2 to 0.5 meter on the ground serve as input data for the automatic extraction.The proposed approach makes use of several versions of the aerial image with different resolution. Roads are modelled as a network of intersections and links between these intersections. For different so-called global contexts, i.e., rural, forest, and urban area, the model defines relations between background objects and road objects. These relations, e.g., that a tree casts a shadow on a road-segment, determine so-called local contexts. These local contexts are modelled differently depending on the global context regions. An automatic segmentation of the aerial image into different global contexts by means of texture classification is used to focus the extraction on the most promising regions. Additionally, it allows to predict in which parts of the image the results will be most reliable. For the actual extraction of the roads edges are extracted in the original high resolution image (pixel size 0.2-0.5 m) and lines in an image of reduced resolution (pixel size 2-4 m). Using both resolution levels and explicit knowledge about roads hypotheses for road-segments are generated. They are grouped iteratively into longer segments. In addition to pure grouping criteria also knowledge about the local context and so-called "Ribbon-Snakes" are used to bridge gaps. For the construction of the road network, intersections are extracted. The examples presented and the results of an evaluation based on manually plotted reference data show the efficiency of the approach. Numéro de notice : 13163 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Thèse étrangère Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=54900 Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 13163-01 33.30 Livre Centre de documentation Photogrammétrie - Lasergrammétrie Disponible
Titre : Automatische Georeferenzierung von Fernerkundungsdaten Titre original : [Géoréférencement automatique de données de télédétection] Type de document : Thèse/HDR Auteurs : Heiner Hild, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 2003 Collection : DGK - C Sous-collection : Dissertationen num. 562 Importance : 132 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-5001-3 Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique
[Termes IGN] arbre (mathématique)
[Termes IGN] base de données ATKIS
[Termes IGN] classe d'objets
[Termes IGN] détection de contours
[Termes IGN] données maillées
[Termes IGN] données vectorielles
[Termes IGN] extraction automatique
[Termes IGN] géoréférencement
[Termes IGN] méthode robuste
[Termes IGN] objet géographique zonal
[Termes IGN] points homologues
[Termes IGN] polygoneIndex. décimale : 33.30 Photogrammétrie numérique Résumé : (Auteur) In photogrammetry and remote sensing, the processing of image based information within a GIS is based on georeferenced data. The methods of direct georeferencing naturally have a high level of automation where indirect methods still need manual interaction. Within this thesis, a completely implemented system for automatic indirect georeferencing is presented. The developed procedure is based on features of polygons being extracted in the data sets to be matched. Where image data are in raster form by nature, reference data for the outlined system can be in raster or in vector form. There do not exist any limitations in form of approximate values. The extraction of polygonal objects from image data is carried out by multiple segmentation. In order to evaluate the results of the chosen region-growing algorithm, several examinations are carried out. Merging of neighboured polygons with the same object class does the extraction of suitable polygons from GIS reference data. Within the framework of this thesis, German ATKIS data are used exclusively. Based on the theory of affine invariants of algebraic forms, features are developed which can be computed from geometric moments of raster and vector polygons. Alternatively, polygon features are derived from cross-weighted moment's invariants that can be obtained from geometric moments of raster and vector polygons in a similar way. Studies on the robustness of the features and their ability to discriminate similar objects are carried out by the use of synthetic and real data. A backtracking-depht-first tree search algorithm with unary and binary constraints obtains the matching of image and reference data. In order to formulate the constraints, an affine transformation is computed from the geometric moments for each pair. The procedure is based on the theory of standard positions. A closing verification step leads to a global affine transformation between image and reference system. The approximate transformation is individually refined with the IterativeClosestPoint algorithm. Based on the optimised affine transformation for each polygon pair, tie points are generated automatically on the borderline of the polygons. Based on a theoretical consideration, extensive studies on the achievable tie point accuracy were carried out with three synthetic and real data sets. The performance and robustness of the developed system under various input data is demonstrated by controlled application of disturbances. Numéro de notice : 15029 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Thèse étrangère DOI : sans En ligne : https://www.ifp.uni-stuttgart.de/dokumente/Dissertationen/hild_c-562.pdf Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=55047 Exemplaires(2)
Code-barres Cote Support Localisation Section Disponibilité 15029-02 33.30 Livre Centre de documentation Photogrammétrie - Lasergrammétrie Disponible 15029-01 33.30 Livre Centre de documentation Photogrammétrie - Lasergrammétrie Disponible
Titre : Bauaufnahme als Modellierungsaufgabe Titre original : [Enregistrements de la construction comme problème de modélisation] Type de document : Thèse/HDR Auteurs : U. Weferling, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 2003 Collection : DGK - C Sous-collection : Dissertationen num. 561 Importance : 170 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-5000-6 Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique
[Termes IGN] architecture
[Termes IGN] détection de contours
[Termes IGN] détection du bâti
[Termes IGN] documentation
[Termes IGN] histoire
[Termes IGN] lever tachéométrique
[Termes IGN] modélisation
[Termes IGN] reconstruction 3D du bâti
[Termes IGN] redressement d'image
[Termes IGN] restitutionIndex. décimale : 33.70 Photogrammétrie terrestre Résumé : (Auteur) Surveying and documentation are two of the basic methods to acquire information about modem and historic buildings, monuments and sites. In many disciplines the geometric and nongeometric building information is important to investigate historic processes, to plan and execute redevelopments or to build up Facility Management Systems. Unfortunately in these fields the potential of computerised geodetic and photogrammetric methods is not very often used for the documentation purpose. In many cases the documentation process is done without the participation of geodesy and photogrammetry, especially in projects of historic investigations or heritage conservation. The missing link between the specific evaluation aims of the building related disciplines and the geometric evaluation of geodesy and photogrammetry is one of the main reasons. Until now the interaction between geometry and all other building information is not investigated sufficient and therefore the complex interdependencies could not take into account using modem methods for building documentation. To solve this problem interdisciplinary documentation methods and strategies are developed based on the so-called 'Allgemeine Modelltheorie'. The well-known modem geodetic and photogrammetric surveying methods are evaluated using the main principles of this modelling theory. As a result of this evaluation the surveying methods are adapted to the application in the different fields of building documentation. An interdisciplinary, method combining documentation strategy is developed which guarantees the optimal use of geodetic and photogrammetric methods for building documentation, especially in the field of historic building research. Numéro de notice : 15030 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Thèse étrangère Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=55048 Exemplaires(2)
Code-barres Cote Support Localisation Section Disponibilité 15030-01 33.70 Livre Centre de documentation Photogrammétrie - Lasergrammétrie Disponible 15030-02 33.70 Livre Centre de documentation Photogrammétrie - Lasergrammétrie Disponible
Titre : Hierarchical real-time recognition of compound objects in images Type de document : Thèse/HDR Auteurs : M. Ulrich, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 2003 Collection : DGK - C Sous-collection : Dissertationen num. 568 Importance : 142 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-5007-5 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image
[Termes IGN] approche hiérarchique
[Termes IGN] méthode robuste
[Termes IGN] objet géographique
[Termes IGN] reconnaissance de formes
[Termes IGN] temps réel
[Termes IGN] transformation de HoughIndex. décimale : 35.20 Traitement d'image Résumé : (Auteur) This dissertation proposes a novel approach for the recognition of compound 2D objects [objets composés en 2 dimensions] in images under real-time conditions. A compound object consists of a number of rigid object parts that show arbitrary relative movements. The underlying principle of the approach is based on minimizing the overall search effort, and hence the computation time. This is achieved by restricting the search according to the relative movements of the object parts. Minimizing the search effort leads to the use of a hierarchical model : only a selected root object part, which stands at the top of the hierarchy, is searched within the entire search space. In contrast, the remaining parts are searched recursively with respect to each other within very restricted search spaces. By using the hierarchical model, prior knowledge about the spatial relations, i.e., relative movements, between the object parts is exploited already in an early stage of the recognition. Thus, the computation time can be reduced considerably. Another important advantage of the hierarchical model is that it provides an inherent determination of correspondence, i.e.. because of the restricted search spaces, ambiguous matches are avoided. Consequently, a complicated and computationally expensive solution of the correspondence problem is not necessary. The approach shows additional remarkable features : it is general with regard to the type of object, it shows a very high robustness, and the compound object is localized with high accuracy. Furthermore, several instances of the object in the image can he found simultaneously.
One substantial concern of this dissertation is to achieve a high degree of automation. Therefore, a method that automatically trains and creates the hierarchical model is proposed. For this, several example images that show the relative movements of the object parts are analyzed. The analysis automatically determines the rigid object parts as well as the spatial relations between the parts. This is very comfortable for the user because a complicated manual description of the compound object is avoided. The obtained hierarchical model is used to recognize the compound object in real-time.
The proposed strategy for recognizing compound objects requires an appropriate approach for recognizing rigid objects. Therefore, the performance of the generalized Hough transform, which is a voting scheme to recognize rigid objects, is further improved by applying several novel modifications. The performance of the new approach is evaluated thoroughly by comparing it to several other rigid object recognition methods. The evaluation shows that the proposed modified generalized Hough transform fulfills even stringent industrial demands.
As a by-product, a novel method for rectifying images in real-time is developed. The rectification is based on the result of a preceding camera calibration. Thus, a very fast elimination of projective distortions and radial lens distortions from images becomes possible. This is exploited to extend the object recognition approach in order to be able to recognize objects in real-time even in projectively distorted images.Numéro de notice : 13193 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Thèse étrangère Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=54908 Exemplaires(2)
Code-barres Cote Support Localisation Section Disponibilité 13193-02 35.20 Livre Centre de documentation Télédétection Disponible 13193-01 35.20 Livre Centre de documentation Télédétection Disponible
Titre : Parameterschätzung für unvollständige funktionale Modelle in der Geodäsie Titre original : [Estimation des paramètres pour un modèle fonctionnel incomplet en géodésie] Type de document : Thèse/HDR Auteurs : S. Petrovic, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 2003 Collection : DGK - C Sous-collection : Dissertationen num. 563 Importance : 61 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-5002-0 Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux
[Termes IGN] corrélation
[Termes IGN] erreur systématique
[Termes IGN] estimation statistique
[Termes IGN] méthode des moindres carrés
[Termes IGN] modèle mathématiqueIndex. décimale : 30.10 Systèmes de référence et réseaux géodésiques Note de contenu : 1) Motivation
1.1 Unvollständige Modelle
1.2 Behandlung systematischer Fehler in der Literatur
1.3 Zum Nachweis der Existenz systematischer Einflüsse in den Daten
1.4 Zur Ausgleichung unvollständiger Modelle
2) Kurze Darstellung der Ausgleichung nach maximaler Korrelation
2.1 Allgemeine Bemerkungen
2.2 Korrelationskoeffizient
2.3 Ausgleichung nach maximaler Korrelation
2.3.1 Definition
2.3.2 Verallgemeinerung auf gewichtete und korrelierte Beobachtungen
2.3.3 Mehrdeutigkeit der Lösung
2.3.4 Lösung des Ausgleichungsproblems nach maximaler Korrelation
2.3.5 Lineare Probleme
2.3.6 Beziehung zur Methode der kleinsten Quadrate
3) Anwendung der Ausgleichung nach maximaler Korrelation bei unvollständigen Modellen
3.1 Allgemeine Strategie
3.2 Residuenanalyse
3.2.1 Aufstellen zusätzlicher Bedingungen
3.2.2 Eindimensionaler Fall
4) Synthetische Beispiele
4.1 Beispiel ohne zufällige Fehler
4.2 Einführung zufälliger Fehler
4.3 Einfluß von Datenlücken
4.4 Nichteindeutige Aufgabenstellungen
5) SchlußbetrachtungNuméro de notice : 13190 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Thèse étrangère Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=54905 Exemplaires(2)
Code-barres Cote Support Localisation Section Disponibilité 13190-02 30.10 Livre Centre de documentation Géodésie Disponible 13190-01 30.10 Livre Centre de documentation Géodésie Disponible PermalinkPermalinkPermalinkPermalinkPermalinkAn integrated approach to the Conceptual Data Modeling of an entire highway agency Geographic Information System (GIS) / Hande Demirel (2002)
PermalinkPermalinkPermalinkInverse Probleme bei der Gravitationsfelsbestimmung mittels SST- und SGG-Satellitenmissionen Darstellungen / J. Kusche (2002)
PermalinkKonzeption, Entwicklung und Erprobung eines digitalen integrierten flugzeuggetragenen Fernerkundungssystems für Precision Farming (PFIFF) / Görres Grenzdorffer (2002)
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