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3D SAR simulation of urban areas based on detailed building models / Stefan Auer in Photogrammetric Engineering & Remote Sensing, PERS, vol 76 n° 12 (December 2010)  

Public [article]  inPhotogrammetric Engineering & Remote Sensing, PERS > vol 76 n° 12 (December 2010) . - pp 1373 - 1384 Titre : 3D SAR simulation of urban areas based on detailed building models Type de document : Article/Communication Auteurs : Stefan Auer, Auteur ; Timo Balz, Auteur ; S. Becker, Auteur ; R. Balmer, Auteur Année de publication : 2010 Article en page(s) : pp 1373 - 1384 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image radar et applications [Termes IGN] bâtiment [Termes IGN] centre de phase [Termes IGN] coin réflecteur [Termes IGN] image TerraSAR-X [Termes IGN] interferométrie différentielle [Termes IGN] lancer de rayons [Termes IGN] modèle 3D de l'espace urbain [Termes IGN] simulation d'image Résumé : (Auteur) This paper confirms the need for detailed 3D models for the simulation of high-resolution SAR images in order to support Persistent Scatterer Interferometry (PSl) focused on single urban objects. Using a building model enhanced by facade grammar, multiple reflections at building facades are analyzed using ray tracing techniques and scatterers are localized in azimuth, range, and elevation. In a case study, salient signatures of a TerraSAR-X image are analyzed based on simulated sar reflectivity maps. Phase centers of trihedral reflections are mapped onto the building model and the physical correspondence of scatterers to building features is investigated. Surfaces contributing to salient scatterers are identified at the building model. Eventually, the use of sar simulation to support PSI is shown from two aspects: (a) for providing a-priori information about building layover, and (b) for extending knowledge about the nature of dominant scatterers. Numéro de notice : A2010-526 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.76.12.1373 En ligne : https://doi.org/10.14358/PERS.76.12.1373 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30718 [article]

Generation and application of rules for quality dependent facade reconstruction / S. Becker in ISPRS Journal of photogrammetry and remote sensing, vol 64 n° 6 (November - December 2009)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 64 n° 6 (November - December 2009) . - 14 p. ; pp 640 - 653 Titre : Generation and application of rules for quality dependent facade reconstruction Type de document : Article/Communication Auteurs : S. Becker, Auteur Année de publication : 2009 Article en page(s) : 14 p. ; pp 640 - 653 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image [Termes IGN] architecture urbaine [Termes IGN] base de règles [Termes IGN] données lidar [Termes IGN] données localisées 3D [Termes IGN] façade [Termes IGN] grammaire de graphes [Termes IGN] itération [Termes IGN] lasergrammétrie [Termes IGN] moteur d'inférence [Termes IGN] photo-interprétation assistée par ordinateur [Termes IGN] qualité des données [Termes IGN] reconstruction 3D du bâti Résumé : (Auteur) Frequently, terrestrial LiDAR and image data are used to extract high resolution building geometry like windows, doors and protrusions for three-dimensional (3D) façade reconstruction. However, such a purely data driven bottom-up modelling of façade structures is only feasible if the available observations meet considerable requirements on data quality. Errors in measurement, varying point densities, reduced accuracies, as well as incomplete coverage affect the achievable correctness and reliability of the reconstruction result. While dependence on data quality is a general disadvantage with data driven bottom-up approaches, model based top-down reconstructions are much more robust. Algorithms introduce knowledge about the appearance and arrangement of objects. Thus, they cope with data uncertainty and allow for a procedural modelling of building structures in a predefined architectural style, which is inherent in grammar or model descriptions. We aim at a quality sensitive façade reconstruction which is on the one hand robust against erroneous and incomplete data, but on the other hand not subject to prespecified rules or models. For this purpose, we combine bottom-up and top-down strategies by integrating automatically inferred rules into a data driven reconstruction process. Façade models reconstructed during a bottom-up method serve as a knowledge base for further processing. Dominant or repetitive features and regularities as well as their hierarchical relationship are detected from the modelled façade elements and automatically translated into rules. These rules together with the 3D representations of the modelled façade elements constitute a formal grammar. It holds all the information which is necessary to reconstruct façades in the style of the given building. The paper demonstrates that the proposed algorithm is very flexible towards different data quality and incomplete sensor data. The inferred grammar is used for the verification of the façade model produced during the data driven reconstruction process and the generation of synthetic façades for which only partial or no sensor data is available. Moreover, knowledge propagation is not restricted to façades of one single building. Based on a small set of formal grammars derived from just a few observed buildings, façade reconstruction is also possible for whole districts featuring uniform architectural styles. Copyright 2009 International Society for Photogrammetry and Remote Sensing, Inc. (ISPRS). Numéro de notice : A2009-496 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2009.06.002 En ligne : https://doi.org/10.1016/j.isprsjprs.2009.06.002 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30125 [article]

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Image restoration for resolution improvement of digital aerial images: a comparison of large format digital cameras / S. Becker in Revue Française de Photogrammétrie et de Télédétection, n° 183 (Septembre 2006)  

Public [article]  inRevue Française de Photogrammétrie et de Télédétection > n° 183 (Septembre 2006) . - pp 5 - 10 Titre : Image restoration for resolution improvement of digital aerial images: a comparison of large format digital cameras Type de document : Article/Communication Auteurs : S. Becker, Auteur ; Norbert Haala, Auteur ; et al., Auteur Année de publication : 2006 Conférence : ISPRS 2006, Commission 1 Symposium, From sensors to imagery 03/07/2006 06/07/2006 Champs-sur-Marne [Paris Marne-la-Vallée] France OA ISPRS Archives Article en page(s) : pp 5 - 10 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image [Termes IGN] accentuation de contours [Termes IGN] ADS40 [Termes IGN] analyse comparative [Termes IGN] caméra numérique [Termes IGN] chambre à grand format [Termes IGN] cohérence des couleurs [Termes IGN] DMC [Termes IGN] image aérienne [Termes IGN] image numérique [Termes IGN] instrumentation Z/I Imaging [Termes IGN] pansharpening (fusion d'images) [Termes IGN] restauration d'image [Termes IGN] tâche image d'un point [Termes IGN] UltraCam Résumé : (Auteur) Within the paper a comparative quantification of the spatial image resolution for large-format digital airborne cameras will be presented. For this purpose, imagery of the Leica ADS40, the Intergraph Z/I-imaging DMC and the Vexcel UltraCamD were examined. The respective spatial resolutions are represented by means of the point spread function, which can be measured easily and reliably at image edges. Thus, images of test patterns like a Siemens star were used. In addition to the evaluation of the original images as they are provided by the camera systems, the potential benefit of a resolution improvement by image restoration is demonstrated. Therefore, a linear restoring finite impulse response filter is applied. Usually, colour image acquisition by digital aerial camera systems is realised by combining data from the multi-spectral module with higher resolution panchromatic imagery. The quality of this pan-sharpening process is presented in the final part of the paper. For this purpose, the potential degradation of colour information by this process was quantified for the three tested camera systems in addition to the resolution measurements. Copyright SFPT Numéro de notice : A2006-625 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueNat DOI : sans En ligne : https://www.isprs.org/proceedings/XXXVI/part1/Papers/T01-03.pdf Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28348 [article]

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Determination and improvement of spatial resolution of the CCD-line-scanner system ADS40 / R. Reulke in ISPRS Journal of photogrammetry and remote sensing, vol 60 n° 2 (April 2006)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 60 n° 2 (April 2006) . - pp 81 - 90 Titre : Determination and improvement of spatial resolution of the CCD-line-scanner system ADS40 Type de document : Article/Communication Auteurs : R. Reulke, Auteur ; S. Becker, Auteur ; et al., Auteur Année de publication : 2006 Article en page(s) : pp 81 - 90 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] ADS40 [Termes IGN] capteur aérien [Termes IGN] capteur spatial [Termes IGN] détecteur à transfert de charge [Termes IGN] image à haute résolution [Termes IGN] image panchromatique [Termes IGN] restauration d'image Résumé : (Auteur) Images that are collected for mapping purposes from airborne or space-borne sensors have to cover large areas by great image swaths at a high spatial resolution. These demands can be fulfilled by push-broom scanners featuring staggered line arrays, which are constructed from two identical CCD lines shifted against each other by half a pixel in line direction. Practical applications of such arrays in remote sensing include SPOT, and in the airborne environment the Airborne Digital Sensor, or ADS40, from Leica Geosystems. Furthermore, image restoration methods for enhancing the image quality can be applied to improve image quality and resolution. This paper presents an approach of high resolution image restitution from staggered lines and practical results with ADS40 high resolution panchromatic images. Copyright ISPRS Numéro de notice : A2006-141 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2005.10.007 En ligne : https://doi.org/10.1016/j.isprsjprs.2005.10.007 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27868 [article]

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