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Titre : Multiple-patch matching in the object space for aerotriangulation Type de document : Monographie Auteurs : Amnon Krupnik, Auteur Editeur : Colombus (Ohio) : Ohio State University Année de publication : 1994 Collection : Department of Geodetic Science and Surveying Reports num. 428 Importance : 94 p. Format : 21 x 27 cm Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique
[Termes IGN] aérotriangulation
[Termes IGN] appariement
[Termes IGN] automatisation
[Termes IGN] modèle stéréoscopique
[Termes IGN] point d'appui
[Termes IGN] points homologuesIndex. décimale : 33.30 Photogrammétrie numérique Résumé : (Auteur) Aerotriangulation has been a well- established photogrammetric procedure for years. With recent developments in digital photogrammetry, it is possible to automate the selection and transfer of tie points as well as the measurement. This increases the efficiency, accuracy and reliability of aerotriangulation projects. This work is concerned with finding an automated method for accurately measuring the tie points.
Although accurate matching has been the subject of numerous research studies in the fields of photogrammetry and computer vision, its application for measuring tie points in aerotriangulation adds some new aspects that have not been fully addressed previously. Such aspects are, for example, lack of exterior orientation parameters, very high accuracy requirements, matching only one point at each area and consistent matching of more than two overlapping image patches.
The method proposed in this dissertation is based on matching warped image patches, or matching in the object space. The warping procedure requires the knowledge of the object surface around each prospective point. The surface is reconstructed by a hierarchical, iterative approach. Both the surface and the set of orientation parameters of all the photographs in the block are improved throughout the iterative procedure.
Experiments were performed to demonstrate the feasibility of the proposed method and to study its effects. The results show that where man-made objects exist, matching warped images outperforms the traditional image space matching techniques. The accuracy of the results is comparable to manual measurements even when relatively low resolution images are used.Numéro de notice : 12127 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Monographie Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=54554 Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 12127-01 33.30 Livre Centre de documentation Photogrammétrie - Lasergrammétrie Disponible Stochastisch-geometrische Beschreibung, Filterung und Präsentation des Reliefs / Andrzej Borkowski (1994)
Titre : Stochastisch-geometrische Beschreibung, Filterung und Präsentation des Reliefs Titre original : [Description géométrique aléatoire, filtrage et présentation du relief] Type de document : Thèse/HDR Auteurs : Andrzej Borkowski, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 1994 Collection : DGK - C Sous-collection : Dissertationen num. 431 Importance : 85 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 3-7696-9474-4 Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique
[Termes IGN] discrétisation
[Termes IGN] entropie
[Termes IGN] filtrage linéaire
[Termes IGN] modèle numérique de terrain
[Termes IGN] représentation discrèteIndex. décimale : 33.30 Photogrammétrie numérique Résumé : (Auteur) This Doctoral thesis covers two main items: the linear relief filtering with restrictions and the discretization of relief without information loss. The modelling of the relief, which is assumed to be a realization of a two-dimensional normal, homogeneous, and bandlimited stochastic process, is based on the theory of stochastic processes. The adequacy of the model choice and its assumptions has been verified using some natural reliefs of the Earth's surface.
Concerning linear filtering the following quantity and quality restrictions were used: preservation of relief shape, of volume, of terrain inclination and finally, the reduction of relative extremums according to Toepfer's choice rule are expressed in stochastic process terminology. The above conditions are realized by the two-dimensional, non-recursive, digital linear filtering (e.g. for generalization purposes, for relief smoothing using digital data). In order to estimate the required parameters the complete knowledge of second order process quantities (autocovariance function or spectral density) is necessary. Numerical experiments with different relief types stored in digital terrain models (DTM) confirmed the possibility of practical realization of linear filtering with restrictions.
The conventional sampling theorem concerning bandlimited random signals is based on the discretization of the abscissa. In opposite to that, the contour line representation of the relief corresponds to a discretization on the ordinate. Sampling rules according to the ordinate, consistent with the original sampling theorem, are given for both one-dimensional and two-dimensional continuous stochastic processes and additionally for discrete signals (time series). Vertical and horizontal intervals of discretization relate to each other by the correlation coefficients of neighboured signal values for discrete signals or by the second order moment of terrain inclination for continuous processes. An estimation approach for optimum grid cell size of DTM interpolated from topographic maps is proposed. This grid ensures a complete as well as a non-redundant data capture from contour line information. The approach is based on the relation between vertical and horizontal intervals of discretization. The necessary parameter i.e. the variance of terrain inclination is estimated using measured lengths of contour lines at different height levels. The consistence of the discretization rules has been confirmed by numerical experiments.Numéro de notice : 28057 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Thèse étrangère Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=63404 Exemplaires(2)
Code-barres Cote Support Localisation Section Disponibilité 28057-01 33.30 Livre Centre de documentation Photogrammétrie - Lasergrammétrie Disponible 28057-02 33.30 Livre Centre de documentation Photogrammétrie - Lasergrammétrie Disponible
Titre : Zur Verfahrensdisposition bei der Digitalen Orthoprojektion Titre original : [Pour la disposition de procédés lors de l'orthoprojection numérique] Type de document : Thèse/HDR Auteurs : W. Mayr, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 1994 Collection : DGK - C Sous-collection : Dissertationen num. 416 Importance : 91 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-9460-4 Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique
[Termes IGN] orthophotoplan numériqueIndex. décimale : 33.30 Photogrammétrie numérique Résumé : (Auteur) Digital orthoprojection (DOP) is a purely mathematical method for digital image transformation. Images of a known geometry, which are stored in the form of digital data, are transformed into a vertical parallel projection, i.e. an orthophoto, using their orientation parameters and the corresponding digital terrain model (DTM). To permit the successful practical implementation of DOP and, as a result, one of the first applications of digital photogrammetry (DP), investigations have been made with regard to process engineering and the possibilities of optimizing the algorithms of DOP.
The present thesis starts by describing the theoretical principles of DOP and presents a new approach. Generally speaking, DOP permits rigorous allowance to be made for high-precision DTMs - a clear advantage offered by DOP over analytical orthoprojection. Mosaicking becomes an integral part of DOP. The new mosaicking technique described here is based on image pyramids and image filtering.
This is followed by a practical section in which the possibilities of optimizing the DOP method are discussed. For this, different versions of the geometric and radiometric components are tested on various computer systems. A wide spectrum of computer systems ranging from the supercomputer to the PC is available for this purpose. The examples given demonstrate that, even at this stage, DOP can be economically operated on workstations.
The subsequent chapter describes various aspects of process engineering in DOP. Since the integration of scanners into the DOP process is essential for several reasons, they are used as a basis for discussing the problems of data quantities, data conversion, data compression, data storage and data output. Several instruments are dealt with as examples for data output. Image orientation data, DTM data and quality control are further important subjects investigated here. The use of texture mapping from the field of computer graphics opens up a further new possibility for orthoprojection, with the DOP being displayed on standard hardware from the computer graphics industry. The requirements and capabilities of texture mapping in DP are presented and provide interesting new prospects.
The main part of the thesis is concluded by selected examples. Mosaicking is demonstrated using image material in black-and-white and colour. Examples of extreme scale ratios of the source image to the orthophoto prove the suitability of DOP for such applications. The content of the image detfermines in this case whether a high or low resolution is used for scanning. The scanner is of paramount importance here.
The main conclusion to be drawn from the present thesis is the suitability of DOP for practical use. Compared with previous techniques, DOP offers clear benefits not only due to the possibility of easy mosaicking. Orthophotos are also, for example, an ideal supplement to geographic information systems. DOP is therefore expected to give a major boost to the acceptance of DP.Numéro de notice : 28069 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Thèse étrangère Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=63416 Exemplaires(2)
Code-barres Cote Support Localisation Section Disponibilité 28069-01 33.30 Livre Centre de documentation Photogrammétrie - Lasergrammétrie Disponible 28069-02 33.30 Livre Centre de documentation Photogrammétrie - Lasergrammétrie Disponible
Titre : Inverse und schlecht gestellte Probleme bei der digitalen photogrammetrischen Objekt-Rekonstruktion Titre original : [Problème mal posé et inversé lors de la reconstruction d'objets en photogrammétrie numérique] Type de document : Thèse/HDR Auteurs : Y.J. Zheng, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 1993 Collection : DGK - C Sous-collection : Dissertationen num. 390 Importance : 123 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-9436-9 Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique
[Termes IGN] Déformation
[Termes IGN] modèle de déformation tectonique
[Termes IGN] photogrammétrie numérique
[Termes IGN] problème inverse
[Termes IGN] restitution
[Termes IGN] restitution numérique
[Termes IGN] surface (géométrie)
[Termes IGN] transformation de Cauchy
[Termes IGN] transformation de LaplaceIndex. décimale : 33.30 Photogrammétrie numérique Numéro de notice : 61413 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Thèse étrangère Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=60936 Exemplaires(2)
Code-barres Cote Support Localisation Section Disponibilité 61413-01 33.30 Livre Centre de documentation Photogrammétrie - Lasergrammétrie Disponible 61413-02 33.30 Livre Centre de documentation Photogrammétrie - Lasergrammétrie Disponible
Titre : Levé numérique par numérisation directe de photographies : projet BD Routières, version 1.0 du 18/05/1993 Type de document : Monographie Auteurs : IGN, Auteur Editeur : Paris : Institut Géographique National - IGN (1940-2007) Année de publication : 1993 Importance : 24 p. Format : 21 x 30 cm Langues : Français (fre) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique
[Termes IGN] numérisation de photographie
[Termes IGN] photographie aérienne
[Termes IGN] restitutionIndex. décimale : 33.30 Photogrammétrie numérique Numéro de notice : 66296 Affiliation des auteurs : IGN (1940-2011) Thématique : IMAGERIE Nature : Monographie Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=61590 Exemplaires(1)
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