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Terrestrial laser scanning : applications in cultural heritage conservation and civil engineering / T. Abmayr (01/08/2005)    

Public Titre : Terrestrial laser scanning : applications in cultural heritage conservation and civil engineering Type de document : Article/Communication Auteurs : T. Abmayr, Auteur ; Fabian Härtl, Auteur ; M. Reinköster, Auteur ; C. Fröhlich, Auteur Editeur : International Society for Photogrammetry and Remote Sensing ISPRS Année de publication : 01/08/2005 Collection : International Archives of Photogrammetry, Remote Sensing and Spatial Information Sciences, ISSN 1682-1750 num. 36-5/W17 Conférence : 3D-ARCH 2005, ISPRS WG V-4 Workshop, Virtual reconstruction and visualisation of complex architecture 22/08/2005 24/08/2005 Venise Italie OA Proceedings Importance : 6 p. Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie [Termes IGN] génie civil [Termes IGN] patrimoine culturel [Termes IGN] télémètre laser terrestre [Termes IGN] télémétrie laser terrestre Résumé : (Auteur) Laser scanners are used more and more as instruments for various tasks in cultural heritage conservation. Especially old buildings and archaeological sites are relevant to offer a variety of applications e.g. the surveying of static or simply the visualization and precise modelling for data archiving purposes. The developed IMAGER 5003 is a state-of-the-art, high precision, high speed laser scanner, which provides accurate measurements. The IMAGER 5003 measures range and intensity images at the same time, with a one to one correspondence between these both images with respect to the angles: The range image generates geometric dimensions of the environmental scenes, whereas the reflectance image generates a photographic like impression of the scanned environment which is used for feature extraction, visual inspection, object segmentation, and surface classification. For visualisation tasks the scan data can be combined with colour information: For this purpose either a special high resolution line scan camera developed by the German Aerospace or a standard digital array camera can be used. This paper introduces from a practical point of view into visualization and modelling techniques by using the laser scanner IMAGER 5003. The paper describes features and methods of the system, and shows up two applications in the field of cultural heritage conservation and civil engineering. Numéro de notice : C2005-012 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Communication DOI : sans En ligne : http://www.isprs.org/proceedings/XXXVI/5-W17/pdf/19.pdf Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=64232

Documents numériques

en open access Terrestrial_laser_scanning_in_cultural_heritage_abmayr.pdf Adobe Acrobat PDF

3D building facade reconstruction under mesh form from multiple wide angle views / Lionel Pénard (2005)    

Public Titre : 3D building facade reconstruction under mesh form from multiple wide angle views Type de document : Article/Communication Auteurs : Lionel Pénard , Auteur ; Nicolas Paparoditis , Auteur ; Marc Pierrot-Deseilligny , Auteur Editeur : International Society for Photogrammetry and Remote Sensing ISPRS Année de publication : 2005 Collection : International Archives of Photogrammetry, Remote Sensing and Spatial Information Sciences, ISSN 1682-1750 num. 36-5/W17 Conférence : 3D-ARCH 2005, ISPRS WG V-4 Workshop, Virtual reconstruction and visualisation of complex architecture 22/08/2005 24/08/2005 Venise Italie OA Proceedings Importance : 7 p. Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques [Termes IGN] appariement d'images [Termes IGN] filtre de déchatoiement [Termes IGN] maillage par triangles [Termes IGN] objectif grand angulaire [Termes IGN] précision géométrique (imagerie) [Termes IGN] reconstruction 3D du bâti [Termes IGN] semis de points [Termes IGN] texture d'image [Termes IGN] traitement d'image Résumé : (Auteur) In this paper, we present an algorithm, which automatically generates textured meshes of building facades from a set of multi over-lapping calibrated and oriented images. We are in a context of massive data production and aim at high geometric accuracy. The central idea is to create a 3D point cloud. After comparison between object-space and image-space techniques, we choose the latter and compute the depths of the pixels in each image using a correlation-based method. A post-processing step is necessary to filter points according to a confidence index and remove the sparse speckle noise. We then perform a global optimization to find a regularized surface. Finally, the 3D point cloud is triangulated. The resulting mesh is an accurate representation of the façade surface from each image view point. We obtain promising results, with a correct texture projection on the reconstructed model. Numéro de notice : C2005-011 Affiliation des auteurs : MATIS (1993-2011) Thématique : IMAGERIE Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : sans En ligne : http://www.isprs.org/proceedings/XXXVI/5-W17/pdf/17.pdf Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=64397

Documents numériques

en open access 3D building facade reconstruction under mesh form Adobe Acrobat PDF

Strategy for extraction of 3D architectural objects from laser and image data acquired from the same viewpoint / Matthieu Deveau (2005)    

Public Titre : Strategy for extraction of 3D architectural objects from laser and image data acquired from the same viewpoint Type de document : Article/Communication Auteurs : Matthieu Deveau , Auteur ; X. Chen, Auteur ; G. Thibault, Auteur ; Nicolas Paparoditis , Auteur ; Marc Pierrot-Deseilligny , Auteur Editeur : International Society for Photogrammetry and Remote Sensing ISPRS Année de publication : 2005 Collection : International Archives of Photogrammetry, Remote Sensing and Spatial Information Sciences, ISSN 1682-1750 num. 36-5/W17 Conférence : 3D-ARCH 2005, ISPRS WG V-4 Workshop, Virtual reconstruction and visualisation of complex architecture 22/08/2005 24/08/2005 Venise Italie OA Proceedings Importance : 5 p. Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques [Termes IGN] bâtiment [Termes IGN] données laser [Termes IGN] extraction automatique [Termes IGN] extraction semi-automatique [Termes IGN] objet géographique complexe [Termes IGN] objet géographique urbain [Termes IGN] polyligne [Termes IGN] primitive géométrique [Termes IGN] reconstruction 3D du bâti [Termes IGN] segmentation d'image [Termes IGN] triangulation (topologie) Résumé : (Auteur) This paper presents a general strategy for 3D reconstruction of complex architectural scenes. This approach makes use of both laser data (range and retro-diffusion) and image data, and of their great complementarity. The proposed approach starts with pose estimation between the two data sets. This part is largely automated by means of correlation of fine feature points and linear primitives. The second part deals with segmentation of the scene. Here, each element of the scene must be detected. This can be fulfilled in two ways. The first one is semi-automatic extraction of the objects where user interaction is used to initialize the object localisation, the second one is fully automatic segmentation, driven by image and 3D data. Then, each object needs to be reconstructed. We consider a large range of objects since we can describe planar surfaces, general geometric primitives and generalised cylinders. When these models do not fit with the surface, that is to say on complex parts, triangulation is performed. This leads to two potential reconstruction tools: one similar to laser data editing software, with more efficient object selection and object boundary estimation, the other would perform automatic reconstruction, which would be followed by a verification procedure. The advantage of this approach, compared to existing techniques, is to reduce dramatically reconstruction time, without having any hard limitation on the set of shapes that can be obtained. Numéro de notice : C2005-010 Affiliation des auteurs : MATIS+Ext (1993-2011) Thématique : IMAGERIE Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : sans En ligne : http://www.isprs.org/proceedings/XXXVI/5-W17/pdf/18.pdf Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=64398

Documents numériques

en open access Strategy for extraction of 3D architectural objects Adobe Acrobat PDF