Descripteur
Documents disponibles dans cette catégorie (628)
Ajouter le résultat dans votre panier
Visionner les documents numériques
Affiner la recherche Interroger des sources externes
Etendre la recherche sur niveau(x) vers le bas
Titre : Multiphoto geometrically constrained matching Type de document : Thèse/HDR Auteurs : Emmanuel P. Baltsavias, Auteur Editeur : Zurich : Institut für Geodäsie und Photogrammetrie IGP - ETH Année de publication : 1991 Collection : IGP Mitteilungen, ISSN 0252-9335 num. 049 Importance : 221 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-906513-01-0 Note générale : Bibliographie
Doctoral Thesis, ETH Zurich, 1991Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique
[Termes IGN] appariement d'images
[Termes IGN] appariement géométrique
[Termes IGN] points homologues
[Termes IGN] prise de vuesIndex. décimale : 33.30 Photogrammétrie numérique Résumé : (auteur) One of the central problems in digital photogrammetry, Computer and machine vision is the problem of automatically finding corresponding features in different images. Correspondence is necessary for 2-D and 3-D measurements and very often a prerequisite for object detection, Classification and identification. Although research for more than three decades has been devoted to this problem, a fully automated, precise and reliable image matching method, able to adapt to different image and scene Contents, does not exist yet. The aim of this research was to improve matching in the above aspects by developing and examining the Performance and applicability of a new algorithm called Multiphoto Geometrically Constrained Matching (MPGC). MPGC is an extension of Least Squares Matching (LSM), which is an area-based matching method establishing a fit between small image patches by an affine geometric and a
two parameter linear radiometric transformation. MPGC considerably improves LSM by using two new elements: (i) the exploitation of any a priori known geometric information to constrain the Solution and (ii) the simultaneous use of any number (more than two) of
images. These elements reduce the search space (conditional 1-D search), improve the accuracy and especially the success rate and reliability of matching. The mathematical model of the algorithm is formulated in terms of a combined least Squares adjustment. The
Observation equations consist of the equations formulating the grey level matching and those that express the geometric constraints, the two parts being related to each other through common unknown parameters. The geometric constraints that have been used in this
research are the collinearity conditions extended by additional parameters modelling systematic errors, assuming that the interior and exterior orientation of the sensors are known. Thus, MPGC permits a simultaneous determination of pixel and object coordinates.
Additionally, through the connection of image and object space, any number of images can be simultaneously accommodated. Two measurement modes were analysed: determination of X, Y, Z object coordinates (match points are fixed in one reference (template) image), and determination of Z over fixed X, Y object coordinates (match point position must be estimated in all images). For greater flexibility the geometric constraints are treated as weighted Observation equations and not as strict conditions. The radiometric parameters are not included in the mathematical model; instead to increase flexibility and speed, radiometric corrections are applied during the iterations. As an alternative, it is proposed to use a Wallis filter for a radiometric equalisation of the images before matching. The Wallis filter has also been used to enhance contrast, high contrast being necessary for accurate matching. Emphasis has been placed on three aspects of the algorithm. Since MPGC is based on a nonlinear least Squares estimation, it requires the knowledge of reasonably precise approximations. After a theoretical analysis of the required quality of the approximations, a method to derive the approximations by a image pyramid based (coarse-to-fine) approach is presented. Different kerneis for the pyramid generation are compared, problems occuring at image borders are treated, geometric relations between pyramid levels are derived and criteria
for the choice of appropriate matching parameters at each level are proposed. The image pyramid approach, in addition to being an efficient way to derive approximate values, increases the convergence radius (in practical tests parallaxes up to 70 pixels have been
handled), convergence rate and computational speed, and can be exploited for a better quality control and self-adaptivity of the algorithm. Without the image pyramid, convergence has been achieved, in some cases, for errors in the approximate values of up to 10-20 pixels, but optimally these approximate values should be 1 pixel accurate. A critical question for surface measurement is the choice of points which should be measured. These points must be characteristic points of the surface but also well determinable. The proposed strategy consists of choosing good match points in the reference image and matching them in all pyramid levels. Points which are considered good lie on edges vertical to the geometric constraint line. They are derived by a direction selective interest Operator using the first and/or the second intensity derivatives. The operator's parameters can be adapted so that the selection of "noisy" pixels is reduced and the required density of selected points is fulfüled. Methods to ensure the existence of the selected points in all pyramid levels are proposed. Thus, MPGC is a combination of area-based and feature-based, especially edge-based, matching. The third major aspect of the investigations is the quality evaluation of the results, the detection of gross errors and the automatic adaptation of the algorithm to different image contents and object surfaces. This aspect includes measures to express the achieved precision, methods for the automatic detection of Wunders and Observation errors, different tests to check the determinability and the significance of the shaping parameters, and ways of automatically adapting the image patch size to the signal content and object surface. The blunder detection test involves checking each individual object point ray based on a combination of criteria, whose thresholds are adapted to the processed image. Many practical accuracy studies, referring to a comparison of accuracy and precision and the amount of detected and undetected Wunders, are presented. The theoretical precision of the shifts, in the
case of good targets, typically is 0.01 - 0.05 pixels. The achieved accuracy was for good planar targets 0.2 - 1 um, for signalised or good natural points 2-3 (im, and for natural points on general surfaces 10 - 15 p.m. whereby the pixel spacing was typically 10 um. In the performed tests, the matching accuracy was generally similar to the accuracy of manual measurements; in certain cases the matching accuracy was even higher than the manual one. The percentage of blunders automatically detected by MPGC varied from 5% - 25% of the total number of points, depending on the image content and object surface. The percentage of undetected Wunders was 1% - 3% of the points accepted by MPGC as being correct, thus comparable to the error rate of a human Operator. Further, it is shown how MPGC can reduce problems like multiple Solutions, occlusions, discontinuities and radiometric distortions in comparison to other algorithms. Finally, methods for the reduction of oscillations and divergence problems and computational aspects are treated. Different applications and tests are presented.Numéro de notice : 60397 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Thèse étrangère Note de thèse : Doctoral Thesis : Science : Zurich : 1991 DOI : 10.3929/ethz-a-000617558 En ligne : https://doi.org/10.3929/ethz-a-000617558 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=60744 Réservation
Réserver ce documentExemplaires (2)
Code-barres Cote Support Localisation Section Disponibilité 60397-01 33.30 Livre Centre de documentation Photogrammétrie - Lasergrammétrie Disponible 60397-02 THESE Livre Centre de documentation Thèses Disponible Objektgestützte Mehrbildzuordnung / Chantal Schneider (1991)
Titre : Objektgestützte Mehrbildzuordnung Titre original : [Classification de plusieurs images appuyées sur l'objet] Type de document : Thèse/HDR Auteurs : Chantal Schneider, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 1991 Collection : DGK - C Sous-collection : Dissertationen num. 375 Importance : 65 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-9422-2 Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique
[Termes IGN] compensation
[Termes IGN] modèle mathématique
[Termes IGN] orientation du capteur
[Termes IGN] photogrammétrie métrologique
[Termes IGN] point d'appui
[Termes IGN] triangulation de DelaunayIndex. décimale : 33.30 Photogrammétrie numérique Résumé : (Auteur) Close range photogrammetry opens up a wide range of measurement applications in the industrial sector. The major demands on an industrial measurement system are high accuracy, high degree of automation and simple handling. To achieve these requirements with a photogrammetric system, the use of digital image measurement techniques is necessary. The object based multi image matching is an algorithm that allows the equivalent processing of an arbitrary number of images, at least two, with simultaneous object reconstruction. This algorithm presents the possibility to measure not signalised surfaces as well as signalised points. This method is implemented in a photogrammetric measurement system that offers a highly automated photogrammetric processing. Some examples of practical applications are given; those are from automobile industry, medicine and aerospace industries. Numéro de notice : 28096 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Thèse étrangère Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=63443 Réservation
Réserver ce documentExemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 28096-01 33.30 Livre Centre de documentation Photogrammétrie - Lasergrammétrie Disponible Photogrammetrische Punktbestimmung mit Bilddaten digitaler Dreizeilenkameras / F. Muller (1991)
Titre : Photogrammetrische Punktbestimmung mit Bilddaten digitaler Dreizeilenkameras Titre original : [Détermination photogrammétrique du point avec des images de caméras numériques à trois barrettes] Type de document : Thèse/HDR Auteurs : F. Muller, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 1991 Collection : DGK - C Sous-collection : Dissertationen num. 372 Importance : 82 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 3-7696-9419-7 Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique
[Termes IGN] application informatique
[Termes IGN] couple stéréoscopique
[Termes IGN] image MOMS-2P
[Termes IGN] image optique
[Termes IGN] modèle mathématique
[Termes IGN] orientation externeIndex. décimale : 33.30 Photogrammétrie numérique Résumé : (Auteur) Digital image recording from aircraft or satellite using opto-electronic linear-array scanners is a promising techno-logy for photogrammetric applications. The earth surface is scanned with one or more linear CCD-sensors, which are oriented perpendicular to the direction of flight. Simultaneous image recording with three linear arrays allows for along-track, three-fold stereoscopy and enables a rigorous three-dimensional evaluation of the image data. The increasing importance of the three-line imaging technique is emphasized by several Systems, which are currently in development.
In this thesis, geometrical aspects of object point determination and reconstruction of the exterior orientation with digital imagery of three-line scanner Systems are investigated and the accuracy potential of three-line image data is outlined. The mathematical model is interpreted as a special case of generalized combined point determination, which is able to process both image coordinates of frame photographs and linear-array imagery.
In a review, optical imaging sensors used in aerial photogrammetry and remote sensing are summarized, followed by a list of linear-array sensor based cameras, which work according to the push-broom principle. Next, digital three-line scanners and related projects and missions are described. Within the process of dynamic photogrammetry, reaching from image recording to object reconstruction, the mathematical model of point determination is explained in detail. The integration of general control- and object information is shown and the procedure for the computation of theoretical accuracy values is treated. The investigations are based to a great amount on project oriented computer simulations. The dependence of the accuracy of point determination on photogrammetric parameters (e.g. design of the camera, flight arrangement) and non-photogrammetric parameters (e.g. use of data from navigation Systems) is outlined.
Finally, a practical application based on three-line imagery is given and the obtained results are discussed.Numéro de notice : 28098 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Thèse étrangère Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=63445 Réservation
Réserver ce documentExemplaires (2)
Code-barres Cote Support Localisation Section Disponibilité 28098-01 33.30 Livre Centre de documentation Photogrammétrie - Lasergrammétrie Disponible 28098-02 33.30 Livre Centre de documentation Photogrammétrie - Lasergrammétrie Disponible Qualitätssteigerung der automatischen Höhenmessung in Stereobildern durch flächenbasierte Kernlinienkorrelation / J. Piechel (1991)
Titre : Qualitätssteigerung der automatischen Höhenmessung in Stereobildern durch flächenbasierte Kernlinienkorrelation Titre original : [Amélioration de la qualité de l'altimétrie automatique dans les images stéréoscopiques au travers de la corrélation linéaire basée sur la surface] Type de document : Thèse/HDR Auteurs : J. Piechel, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 1991 Collection : DGK - C Sous-collection : Dissertationen num. 376 Importance : 81 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-9423-9 Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique
[Termes IGN] couple stéréoscopique
[Termes IGN] données altimétriques
[Termes IGN] modèle numérique de terrain
[Termes IGN] orientation interne
[Termes IGN] qualité des données
[Termes IGN] régression linéaireIndex. décimale : 33.30 Photogrammétrie numérique Résumé : (Auteur) Numéro de notice : 28095 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Thèse étrangère Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=63442 Réservation
Réserver ce documentExemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 28095-01 33.30 Livre Centre de documentation Photogrammétrie - Lasergrammétrie Disponible Regular GRID DEM data compression by using zero-crossings / U. Chakreyavanich (1991)
Titre : Regular GRID DEM data compression by using zero-crossings : the automatic breakline detection method Type de document : Monographie Auteurs : U. Chakreyavanich, Auteur Editeur : Colombus (Ohio) : Ohio State University Année de publication : 1991 Collection : Department of Geodetic Science and Surveying Reports num. 412 Importance : 90 p. Format : 21 x 27 cm Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique
[Termes IGN] contour
[Termes IGN] détection de contours
[Termes IGN] extraction automatique
[Termes IGN] modèle numérique de surface
[Termes IGN] modèle numérique de terrain
[Termes IGN] Triangulated Irregular NetworkIndex. décimale : 33.30 Photogrammétrie numérique Résumé : (Auteur) This report presents an automatic method of extracting Breaklines and Breakpoints from a set of regular grid DEM data. The regular DEM data are considered as an array of signal which can be convolved by the Laplacian of Gaussian (LoG) filter. It is found that points having positive maximum or negative minimum convoluted values (extremas) between zero-crossings of LoG are located at places critical for terrain description. The extremas, obtained by the proposed method correspond to breaklines and breakpoints of the terrain. These breakpoints and breaklines contain explicit information and have more meaning than regular grid points. Based on the concept of using breaklines and breakpoints as the terrain relief representation, the proposed technique can be considered as a DEM data compression process. This work shows that contour maps constructed from the extracted breaklines and breakpoints exhibit similar terrain roughness as the ones constructed from the full DEM data. The results justify the possibility of implementing this concept. Furthermore, breaklines and breakpoints obtained by this technique are almost identical to the ones manually collected by human operators. Numéro de notice : 12095 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Monographie Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=54525 Réservation
Réserver ce documentExemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 12095-01 33.30 Livre Centre de documentation Photogrammétrie - Lasergrammétrie Disponible Relational matching for stereopsis / O. Zilberstein (1991)PermalinkWissensgestützte digitale Bildkoordinatenmessung in aberrationsbehafteten Meßbildern / A. Meid (1991)PermalinkDecision considerations arising from error propagation through belief calculations / J.L. Kretsch in Photogrammetric Engineering & Remote Sensing, PERS, vol 56 n° 6 (june 1990)PermalinkDelineating road structures on satellite imagery by a GIS-guided technique / J. Van Cleynenbreugel in Photogrammetric Engineering & Remote Sensing, PERS, vol 56 n° 6 (june 1990)PermalinkArchitecture and components of photogrammetric workstations / J.D. Bonjour in Photogrammetric record, vol 13 n° 75 (April - September 1990)PermalinkDigital plotters : current status and future developments / Ian J. Dowman in Photogrammetric record, vol 13 n° 75 (April - September 1990)PermalinkNear real time photogrammetry on a personal computer / H. Ruther in Photogrammetric record, vol 13 n° 75 (April - September 1990)PermalinkUne approche de la détermination automatique des éléments remarquables du terrain sur des MNT réguliers / Evelyne Durand (1990)PermalinkErfassung unsteter Oberflächen aus digitalen Bilddaten durch Flächen- und Kantenzuordnung / R. Li (1990)PermalinkIntegration von Bildzuordnung, Punktbestimmung, Oberflächenrekonstruktion und Orthoprojektion innerhalb der digitalen Photogrammetrie / Christian Heipke (1990)Permalink