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Total variation methods for three dimensional LIDAR image denoising / F. Crosby 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 1365 - 1371 Titre : Total variation methods for three dimensional LIDAR image denoising Type de document : Article/Communication Auteurs : F. Crosby, Auteur ; H. Zhou, Auteur ; Q. Huynh, Auteur Année de publication : 2010 Article en page(s) : pp 1365 - 1371 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie [Termes IGN] données lidar [Termes IGN] données localisées 3D [Termes IGN] filtrage du bruit [Termes IGN] traitement d'image Résumé : (Auteur) New imaging capabilities have given rise to higher dimensional image processing. This paper presents a generalization of total variation (tv) based denoising model with a specific application to three-dimensional flash lidar imagery. The generalization uses a weighted norm, rather than the standard Euclidean measure, that accounts for sampling differences that may exist along different axes. We compare this new method against successive two-dimensional denoising and three-dimensional TV denoising. The results show that denoising with a weighted norm presents much better object recognition for multi-plane objects compared with both of the other methods. Further, it does not blur single plane objects beyond the result obtained with two-dimensional denoising. Numéro de notice : A2010-525 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.76.12.1365 En ligne : https://doi.org/10.14358/PERS.76.12.1365 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30717 [article]

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]