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Optimal placement of a terrestrial laser scanner with an emphasis on reducing occlusions / Morteza Heidari Mozaffar in Photogrammetric record, vol 31 n° 156 (December 2016 - February 2017)  

Public [article]  inPhotogrammetric record > vol 31 n° 156 (December 2016 - February 2017) . - pp 374 – 393 Titre : Optimal placement of a terrestrial laser scanner with an emphasis on reducing occlusions Type de document : Article/Communication Auteurs : Morteza Heidari Mozaffar, Auteur ; Masood Varshosaz, Auteur Année de publication : 2016 Article en page(s) : pp 374 – 393 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes descripteurs IGN] algorithme [Termes descripteurs IGN] angle de visée [Termes descripteurs IGN] occultation du signal [Termes descripteurs IGN] optimisation spatiale [Termes descripteurs IGN] point de visibilité [Termes descripteurs IGN] télémétrie laser terrestre Résumé : (auteur) In this paper, a new automated algorithm is proposed that finds the optimum locations of a terrestrial laser scanner (TLS), ensuring completeness of data and minimising the number of scanning locations. The process starts with an initial scan and placing a 3D grid of candidate stations over the entire scan area. A global visibility analysis is then performed to identify the next best view (NBV) location. The TLS is placed on this selected point and a new scan is recorded. Having updated the initial scan with the resulting point cloud, the model is checked for completeness and density. The process is repeated until full coverage of the scan area is achieved by determining the best global arrangement with the minimum number of stations. Experiments show that the algorithm is able to automatically determine the station positions and provide a coverage of 99·5% for simulated data and 91% for real data. Numéro de notice : A2016--002 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/phor.12162 date de publication en ligne : 15/12/2016 En ligne : https://doi.org/10.1111/phor.12162 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=83820 [article]

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Development of a new stereo-panorama system based on off-the-shelf stereo cameras / Amir Shahrokh Amini in Photogrammetric record, vol 29 n° 146 (June - August 2014)  

Public [article]  inPhotogrammetric record > vol 29 n° 146 (June - August 2014) . - pp 206 - 223 Titre : Development of a new stereo-panorama system based on off-the-shelf stereo cameras Type de document : Article/Communication Auteurs : Amir Shahrokh Amini, Auteur ; Masood Varshosaz, Auteur ; Mohammad Saadatseresht, Auteur Année de publication : 2014 Article en page(s) : pp 206 - 223 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique [Termes descripteurs IGN] image panoramique [Termes descripteurs IGN] mesure géométrique [Termes descripteurs IGN] modèle stéréoscopique [Termes descripteurs IGN] modélisation 3D Résumé : (Auteur) There exist a number of techniques which are used to produce stereo panoramas, each of which has its own advantages and disadvantages. In this paper, a new stereo-panorama generating system is presented which uses off-the-shelf stereo cameras. In addition to stereoviewing, the system offers the possibility of making geometric measurements. The benefits of such a system are: (a) overcoming the effects of moving objects in the images; (b) increased automation of matching and stitching; (c) simple geometric information extraction; and (d) equal resolution over the whole stereo panorama. The structure of the system is described, including system implementation, calibration, stereo-panorama generation, georeferencing, co-registration of multiple panoramas and 3D measurements. In addition, an experiment to evaluate the capability of the system in modelling 3D environments is reported. Evaluation results show that the system can produce a suitable 3D panoramic environment for the simultaneous 3D visualisation and measurement of objects, especially in urban areas. Numéro de notice : A2014-281 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/phor.12059 date de publication en ligne : 15/06/2014 En ligne : https://doi.org/10.1111/phor.12059 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=33184 [article]

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