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An algorithm for automatic detection of pole-like street furniture objects from Mobile Laser Scanner point clouds / C. Cabo in ISPRS Journal of photogrammetry and remote sensing, vol 87 (January 2014)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 87 (January 2014) . - pp 47 - 56 Titre : An algorithm for automatic detection of pole-like street furniture objects from Mobile Laser Scanner point clouds Type de document : Article/Communication Auteurs : C. Cabo, Auteur ; C. Ordonez, Auteur ; S. Garcia-Cortés, Auteur ; J. Martinez, Auteur Année de publication : 2014 Article en page(s) : pp 47 - 56 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie [Termes IGN] détection automatique [Termes IGN] discrétisation [Termes IGN] données lidar [Termes IGN] données localisées 3D [Termes IGN] mobilier urbain [Termes IGN] semis de points [Termes IGN] voxel Résumé : (Auteur) An algorithm for automatic extraction of pole-like street furniture objects using Mobile Laser Scanner data was developed and tested. The method consists in an initial simplification of the point cloud based on the regular voxelization of the space. The original point cloud is spatially discretized and a version of the point cloud whose amount of data represents 20–30% of the total is created. All the processes are carried out with the reduced version of the data, but the original point cloud is always accessible without any information loss, as each point is linked to its voxel. All the horizontal sections of the voxelized point cloud are analyzed and segmented separately. The two-dimensional fragments compatible with a section of a target pole are selected and grouped. Finally, the three-dimensional voxel representation of the detected pole-like objects is identified and the points from the original point cloud belonging to each pole-like object are extracted. The algorithm can be used with data from any Mobile Laser Scanning system, as it transforms the original point cloud and fits it into a regular grid, thus avoiding irregularities produced due to point density differences within the point cloud. The algorithm was tested in four test sites with different slopes and street shapes and features. All the target pole-like objects were detected, with the only exception of those severely occluded by large objects and some others which were either attached or too close to certain features. Numéro de notice : A2014-011 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2013.10.008 En ligne : https://doi.org/10.1016/j.isprsjprs.2013.10.008 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32916 [article]

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Non-contact 3D measurement of buildings through close range photogrammetry and a laser distance meter / J. Martinez in Photogrammetric Engineering & Remote Sensing, PERS, vol 77 n° 8 (August 2011)  

Public [article]  inPhotogrammetric Engineering & Remote Sensing, PERS > vol 77 n° 8 (August 2011) . - pp 805 - 811 Titre : Non-contact 3D measurement of buildings through close range photogrammetry and a laser distance meter Type de document : Article/Communication Auteurs : J. Martinez, Auteur ; C. Ordonez, Auteur ; Pedro Arias, Auteur ; Julia Armesto, Auteur Année de publication : 2011 Article en page(s) : pp 805 - 811 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique [Termes IGN] bâtiment [Termes IGN] données localisées 3D [Termes IGN] lever souterrain [Termes IGN] photogrammétrie métrologique [Termes IGN] photogrammétrie terrestre [Termes IGN] télémétrie laser terrestre Résumé : (Auteur) Close-range photogrammetry is a widely used technique to acquire dimensional data of buildings. The indirect measurement of buildings under construction from images avoids the use of tedious and risky direct procedures. In this paper, we present the extension of a 2D low-cost measurement system previously developed to a 3D measurement of buildings under construction. This system consists of a digital, off-the-shelf camera and a laser distance meter which is mounted on an in-house support that permits independent orientation of the distance meter. Combining the image, the distance and the support orientation from different points of view, we can obtain a scaled 3D model that permits us to make an inventory of a building under construction with a relative error below 0.7 percent. Numéro de notice : A2011-349 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.77.8.805 En ligne : https://doi.org/10.14358/PERS.77.8.805 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31128 [article]