Détail de l'auteur
Auteur W. Kornus |
Documents disponibles écrits par cet auteur (5)
Ajouter le résultat dans votre panier Affiner la recherche Interroger des sources externes
DMC geometry analysis and virtual image characterisation / R. Alamus in Photogrammetric record, vol 23 n° 124 (December 2008 - February 2009)
[article]
Titre : DMC geometry analysis and virtual image characterisation Type de document : Article/Communication Auteurs : R. Alamus, Auteur ; W. Kornus, Auteur Année de publication : 2008 Conférence : ISPRS 2007, High-Resolution Earth Imaging for Geospatial Information workshop 29/05/2007 01/06/2007 Hanovre Allemagne Article en page(s) : pp 353 - 371 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s)
[Termes IGN] aérotriangulation automatisée
[Termes IGN] auto-étalonnage
[Termes IGN] chambre à grand format
[Termes IGN] compensation par faisceaux
[Termes IGN] DMC
[Termes IGN] erreur systématique
[Termes IGN] espace image
[Termes IGN] géométrie de l'image
[Termes IGN] géoréférencement
[Termes IGN] modélisation géométrique de prise de vue
[Termes IGN] points homologues
[Termes IGN] précision géométrique (imagerie)
[Termes IGN] rapport base hauteur
[Termes IGN] résiduRésumé : (Auteur) Since the advent of the first large format digital aerial cameras, high expectations have been placed on their performance. The dream of obtaining aerial images virtually free of geometric errors and with greater radiometric quality is getting close. Nevertheless, systematic image residuals, unexpected height errors in aerial triangulation and the need for additional self-calibration parameters have been reported since 2005. In this paper a preliminary analysis of the theoretical accuracies in aerial triangulation using the Zeiss/Intergraph (Z/I) Digital Mapping Camera (DMC) and an analogue camera is conducted, motivated by those recent reports. This analysis considers a mathematical model where the image has conical geometry and is free of systematic errors. The influence on the propagated block accuracy of the base-to-height ratio, image pointing precision (both manual and automatic), GPS observations for projection centres and of pass/tie point density is studied. Moreover, the expected accuracy in the aerial triangulation of analogue images using current procedures (having regard to the a priori accuracy for image pointing, ground control measurement and GPS and pass/tie point density) is computed. The goal of this theoretical study is to find the requirements for aerial triangulation with DMC data which would yield the same or an even higher level of accuracy than that obtained with analogue data under the same conditions. The paper continues with a check on the conclusions of this theoretical analysis, using real data-sets and aerial triangulation set-up, which fit with the theoretical analysis. The results prove that the expected theoretical accuracy in aerial triangulation is only obtained if an appropriate self-calibration parameter set is considered in the bundle block adjustment and/or if good GPS observations are available. These requirements result from the unfavourable propagation from unmodelled systematic error in the DMC image blocks. Some authors have detected systematic residuals in the order of one-tenth of a pixel rms in DMC image space. For this reason, investigations are being carried out on systematic error characterisation, distribution in image space and stability over time and flying height, and systematic error modelling, using self-calibration parameter sets and applying correction grids. Finally, conclusions are drawn from the investigations. Copyright RS&PS + Blackwell Publishing Numéro de notice : A2008-417 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/j.1477-9730.2008.00504.x En ligne : https://doi.org/10.1111/j.1477-9730.2008.00504.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29488
in Photogrammetric record > vol 23 n° 124 (December 2008 - February 2009) . - pp 353 - 371[article]Studies on DMC geometry / R. Alamus in ISPRS Journal of photogrammetry and remote sensing, vol 60 n° 6 (September 2006)
[article]
Titre : Studies on DMC geometry Type de document : Article/Communication Auteurs : R. Alamus, Auteur ; W. Kornus, Auteur ; J. Talaya, Auteur Année de publication : 2006 Article en page(s) : pp 375 - 386 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s)
[Termes IGN] analyse comparative
[Termes IGN] chambre DTC
[Termes IGN] DMC
[Termes IGN] données lidar
[Termes IGN] étalonnage de capteur (imagerie)
[Termes IGN] modèle numérique de surface
[Termes IGN] photogrammétrie aérienne
[Termes IGN] précision géométrique (imagerie)Résumé : (Auteur) Since the ISPRS Congress 2000 in Amsterdam, there are great expectations in matrix-CCD based digital cameras for aerial photogrammetry and mapping applications. During the last two years the number of DMC cameras in the market has raised significantly (32 cameras were sold until March 2006). This paper discusses the DMC accuracy focusing on the role of self-calibration parameters and the assessment of automatic DEM quality. This investigation concluded that under the current status of DMC an appropriate set of self-calibration parameters is necessary in order to achieve theoretical accuracy and precision, which were discussed in early literature. In the following discussions, the accuracy of the DMC is analyzed comparing its performance in automatic DEM generation to that of an analog camera using a Lidar DEM as reference. Despite the fact that the higher image quality of the DMC should overcome the poorer base-to-height ratio, the presented results did not reach the expected accuracies. However, our current study is not yet conclusive on this topic because the DMC, the analog images and the LIDAR data have not been acquired at the same time. Numéro de notice : A2006-410 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2006.05.006 En ligne : https://doi.org/10.1016/j.isprsjprs.2006.05.006 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28134
in ISPRS Journal of photogrammetry and remote sensing > vol 60 n° 6 (September 2006) . - pp 375 - 386[article]Réservation
Réserver ce documentExemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 081-06061 SL Revue Centre de documentation Revues en salle Disponible DEM generation from SPOT-5 3-fold along track stereoscopic imagery using autocalibration / W. Kornus in ISPRS Journal of photogrammetry and remote sensing, vol 60 n° 3 (May 2006)
[article]
Titre : DEM generation from SPOT-5 3-fold along track stereoscopic imagery using autocalibration Type de document : Article/Communication Auteurs : W. Kornus, Auteur ; R. Alamus, Auteur ; et al., Auteur Année de publication : 2006 Article en page(s) : pp 147 - 159 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie spatiale
[Termes IGN] auto-étalonnage
[Termes IGN] compensation par faisceaux
[Termes IGN] erreur moyenne quadratique
[Termes IGN] espace objet
[Termes IGN] image SPOT-HRS
[Termes IGN] modèle numérique de surface
[Termes IGN] modèle numérique de terrain
[Termes IGN] point d'appui
[Termes IGN] précision du positionnement
[Termes IGN] semis de pointsRésumé : (Auteur) This paper describes the derivation and accuracy assessment of Digital Elevation Models (DEM) from 3-fold along-track stereoscopic SPOT-5 imagery. The work was conducted in the scope of the HRS (Haute Resolution Stereoscopique)-Scientifïc Assessment Program, organized by the Centre National d'Etudes Spatiales (CNES) and the International Society of Photogrammetry and Remote Sensing (ISPRS). The orientation of the SPOT-5 image scene is reconstructed by bundle adjustment using ground control points. The functional model is based on correction polynomials and permits autocalibration. At 17 independent check points a RMS-error of 2 m was achieved. DEM are produced in two different ways: The more rigorous way employs an automatic region growing image matching process generating a dense point cloud in image space, transforms it into the object space using the estimated model parameters and converts it into a regular grid DEM. In a second approach the commercial software ISAE and rational functions are applied. The comparison with a digital terrain model (DTM) of superior accuracy yields standard deviations better than 5 m in flat and moderate terrain and better than 10 m in mountainous regions. With ISAE a DEM for the entire image area (approx. 60 x 80 km) is produced with a standard deviation of approximately 8 m. All grid points were generated fully automatically, i.e. the presented standard deviations still include the effect of large differences between the produced DEM and the DTM. Copyright ISPRS Numéro de notice : A2006-226 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2005.12.004 En ligne : https://doi.org/10.1016/j.isprsjprs.2005.12.004 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27953
in ISPRS Journal of photogrammetry and remote sensing > vol 60 n° 3 (May 2006) . - pp 147 - 159[article]Réservation
Réserver ce documentExemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 081-06031 SL Revue Centre de documentation Revues en salle Disponible Dreidimensionale Objektrekonstruktion mit digitalen Dreizeilenscannerdaten des Weltraumprojekts MOMS-02/D2 / W. Kornus (1999)
Titre : Dreidimensionale Objektrekonstruktion mit digitalen Dreizeilenscannerdaten des Weltraumprojekts MOMS-02/D2 Titre original : [Reconstruction d'objets en 3D avec des données numérisées du projet mondial MOMS-02/D2] 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. 496 Importance : 96 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-9535-9 Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique
[Termes IGN] capteur en peigne
[Termes IGN] compensation
[Termes IGN] erreur systématique
[Termes IGN] étalonnage de capteur (imagerie)
[Termes IGN] image Spacelab-MOMS
[Termes IGN] reconstruction 3D du bâtiIndex. décimale : 33.30 Photogrammétrie numérique Résumé : (Auteur) MOMS-02 is a pushbroom multi-line scanner developed at the German company Daimler-Benz Aerospace AG (Dasa) for digital, high resolution, threefold stereoscopic and multispectral image data acquisition of the Earth's surface from space. During the German spacelab mission D2 MOMS-02 recorded imagery of approximately 7.000.000 km2 from 300 km altitude with a ground pixel size of 4.5 m and 13.5 m. After the D2 mission MOMS-02 was refurbished to be reoperated on the Russian space station MIR. With the modified designation MOMS-2P it is attached to the remote sensing MIR-module PRIRODA since May 1996.
The thesis describes the development of a procedure for highly accurate three-dimensional object reconstruction using digital three-line scanner imagery of the MOMS camera. This involves the appropriate extension of the functional model by considering the specific geometric characteristics of MOMS, the application of the new functional model and also its verification using synthetical and practical data. The geometric calibration of the scanner sets up a further point of emphasis due to its direct influence on the accuracy of the three-dimensional object reconstruction.
The first chapter gives a survey of the most important existing and already completed three-line scanner projects, including MOMS-02/D2 and MOMS-2P/PRIRODA, to outline the state-of-the-art of three-line technology. Next, the extensions of the functional model for the reconstruction of both the interior and the exterior orientation are described. As far as the interior orientation is concerned, the new approach rigorously models the geometric relations between the different optics pointing in three directions. For the reconstruction of the exterior orientation the so far existing linear model is replaced by a general higher degree polynomial approach, which is capable to suitably approximate short orbit arcs (1-2 minutes) of satellites or manned space vehicles like the space shuttle or the space station MIR. Optionally systematic errors in the observed parameters of the exterior orientation can simultaneously be estimated in the adjustment. By extensive computer simulations the overall accuracy of point determination is investigated and its dependency on standard deviations of the input data and on various system-, model-, and other geometric parameters is analysed. From the results geometric relations and requirements for a complete exhaustion of the MOMS-02 accuracy potential are deduced, implying helpful information e.g. for the definition of possible future three-line scanner systems.
The geometric calibration procedure in the Dasa-laboratories is described and the resulting provided calibration data set is given. In a separate evaluation using the newest calibration measurements for the MOMS-2P/PRIRODA project an other calibration data set is deduced, which is in accordance to the extended functional model of the interior orientation. Among the navigation data, the ground coordinates of control points and the image coordinates of tie points, the calibration data build one of four observation groups, which simultaneously are considered in the bundle adjustment. Since all the groups originate from different sources, they first have to be analysed and pre-processed in order to obtain a homogeneous input data set. Subsequently the extended functional approach is applied using practical MOMS-02/D2 imagery and auxiliary data in a combined photogrammetric bundle adjustment. In the process the appearing uncertainties and inconsistencies of the input data are considered as far as possible. As a result 44 independent check points, derived by GPS ground measurements, proved an empirical height accuracy of 4.1 m. Compared to the mission requirement of 5 m height accuracy the performance of the new approach is expressively demonstrated. Finally the results are discussed and compared with the outcome of similar evaluations derived at other places.
From the experiences of the practical evaluation it can be concluded, that the geometric calibration data set, gained in the laboratory, is not practically applicable, or at least only to some extent, due to different conditions in the space environment. Therefore in a separate chapter the question is discussed, how far the camera parameters can be determined in-orbit by photogrammetric methods using precise ground control. By computer simulations the theoretical standard deviations of different camera parameter sets are analysed dependent on different control point distributions for single strip evaluation and also for the simultaneous adjustment of two intersecting strips. Finally a summarising discussion and an outlook towards forthcoming and planned stereo-line scanner missions is given.Numéro de notice : 46109 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Thèse étrangère Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=58469 Réservation
Réserver ce documentExemplaires(2)
Code-barres Cote Support Localisation Section Disponibilité 46109-01 33.30 Livre Centre de documentation Photogrammétrie - Lasergrammétrie Disponible 46109-02 33.30 Livre Centre de documentation Photogrammétrie - Lasergrammétrie 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