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Development of a large-format UAS imaging system with the construction of a one sensor geometry from a multicamera array / Jiann-Yeou Rau in IEEE Transactions on geoscience and remote sensing, vol 54 n° 10 (October 2016)  

Public [article]  inIEEE Transactions on geoscience and remote sensing > vol 54 n° 10 (October 2016) . - pp 5925 - 5934 Titre : Development of a large-format UAS imaging system with the construction of a one sensor geometry from a multicamera array Type de document : Article/Communication Auteurs : Jiann-Yeou Rau, Auteur ; Jyun-Ping Jhan, Auteur ; Yi-Tang Li, Auteur Année de publication : 2016 Article en page(s) : pp 5925 - 5934 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] capteur aérien [Termes IGN] chambre à grand format [Termes IGN] drone [Termes IGN] géométrie de l'image [Termes IGN] image 3D [Termes IGN] image multicapteur Résumé : (auteur) For the purpose of large-area topographic mapping, this study proposes an imaging system based on a multicamera array unmanned aerial system (UAS) comprised of five small-format digital cameras with a total field of view of 127°. The five digital cameras are aligned in a row along the across-track direction with overlap between two neighboring cameras. The suggested system has higher data acquisition efficiency than the single-camera UAS imaging system. For topographic mapping purposes, we develop a modified projective transformation method to stitch all five raw images into one sensor geometry. In this method, the transformation coefficients are obtained by on-the-job multicamera self-calibration, including interior and relative orientations. During the stitching process, two systematic errors are detected and corrected. In the end, a large-format digital image can be produced for each trigger event independently. The photogrammetric collinearity condition is evaluated using several external accuracy assessments, such as conventional aerial triangulation, stereoplotting, and digital surface model generation procedures. From the accuracy assessment results, we conclude that the presented raw image stitching method can be used to construct a one sensor geometry from a multicamera array and is feasible for 3-D mapping applications. Numéro de notice : A2016-863 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2016.2575066 En ligne : http://dx.doi.org/10.1109/TGRS.2016.2575066 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=82896 [article]

Robust reconstruction of building models from three-dimensional line segments / Jiann-Yeou Rau in Photogrammetric Engineering & Remote Sensing, PERS, vol 69 n° 2 (February /2003)  

Public [article]  inPhotogrammetric Engineering & Remote Sensing, PERS > vol 69 n° 2 (February /2003) . - pp 181 - 188 Titre : Robust reconstruction of building models from three-dimensional line segments Type de document : Article/Communication Auteurs : Jiann-Yeou Rau, Auteur ; L.C. Chen, Auteur Année de publication : 2003 Article en page(s) : pp 181 - 188 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie spatiale [Termes IGN] automatisation [Termes IGN] contour [Termes IGN] extraction semi-automatique [Termes IGN] méthode robuste [Termes IGN] niveau du sol [Termes IGN] primitive volumique [Termes IGN] reconstruction 3D du bâti [Termes IGN] segment de droite Résumé : (Auteur) This paper presents a novel method for semiautomatically constructing building models from photogrammetric 3D line segments of buildings, i.e., their roof edges. The method, which we call "Split MergeShape" (SMS), can treat both complete line segments as well as incomplete line segments due to image occlusions. The proposed method is comprised of five major parts: (1) the creation of the Region of Interest (ROI) and preprocessing, (2) splitting the model by using the 3D line segments to construct a combination of roof primitives, (3) merging connected roof primitives to complete the boundary of each building, (4) shaping each building rooftop by connected coplanar analysis and coplanar fitting, and (5) quality assurance. The experimental results indicate that the proposed method can soundly rebuild the topology from the 3D line segments and reconstruct building models with up to a 98 percent success rate. The proposed SMS method has been proved reliable and effective, with a high degree of automation, even when groups of connected buildings or complex types of buildings are processed. Numéro de notice : A2003-013 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.69.2.181 En ligne : https://doi.org/10.14358/PERS.69.2.181 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22311 [article]