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Depth camera indoor mapping for 3D virtual radio play / Juho-Pekka Virtanen in Photogrammetric record, vol 33 n° 162 (June 2018)  

Public [article]  inPhotogrammetric record > vol 33 n° 162 (June 2018) . - pp 171 - 195 Titre : Depth camera indoor mapping for 3D virtual radio play Type de document : Article/Communication Auteurs : Juho-Pekka Virtanen, Auteur ; Matti Kurkela, Auteur ; Tuomas Turppa, Auteur ; et al., Auteur Année de publication : 2018 Article en page(s) : pp 171 - 195 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique web [Termes IGN] bâtiment [Termes IGN] carte d'intérieur [Termes IGN] cartographie pour écran mobile [Termes IGN] convivialité [Termes IGN] données localisées 3D [Termes IGN] environnement géographique virtuel [Termes IGN] modélisation 3D [Termes IGN] moteur de jeu Résumé : (Auteur) By combining game engines with indoor mapping, it is possible to create interactive virtual environments that represent the real world. In this paper, a virtual version of an audio installation in a historic building is produced, where the user freely explores the building and experiences a set of audio clips, creating a virtual radio play. A depth camera indoor mapping system, Matterport, captured a set of staged interiors. The aim was to evaluate the quality and usability of the indoor models and to demonstrate applying them in 3D application development. The quality of the models was evaluated by comparison with laser scanning, revealing limitations with Matterport: increasing the size of the measured area lowered the level of detail and accuracy of volumetric models. The quality of textures was not affected by this limitation, maintaining the appearance of models. To obtain optimised models for mobile 3D applications, a manual revision process was applied. Numéro de notice : A2018-223 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/phor.12239 Date de publication en ligne : 16/04/2018 En ligne : https://doi.org/10.1111/phor.12239 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=90043 [article]

Advancement of close range photogrammetry with a portable panoramic image mapping system (PPIMS) / Yung-Chuan Chen in Photogrammetric record, vol 33 n° 162 (June 2018)  

Public [article]  inPhotogrammetric record > vol 33 n° 162 (June 2018) . - pp 196 - 216 Titre : Advancement of close range photogrammetry with a portable panoramic image mapping system (PPIMS) Type de document : Article/Communication Auteurs : Yung-Chuan Chen, Auteur ; Yi-Hsing Tseng, Auteur Année de publication : 2018 Article en page(s) : pp 196 - 216 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] caméra numérique [Termes IGN] compensation par faisceaux [Termes IGN] élément d'orientation externe [Termes IGN] étalonnage de capteur (imagerie) [Termes IGN] image panoramique [Termes IGN] positionnement par GPS [Termes IGN] système de numérisation mobile Résumé : (Auteur) Mobile mapping technologies have contributed to close range photogrammetry becoming an efficient method for a wide range of applications over the last two decades. Advancements have included the integration of multi‐camera images and georeferencing data collected with a mobile mapping system (MMS). This paper proposes the use of a portable panoramic image mapping system (PPIMS), which is a specially designed platform equipped with eight cameras to capture panoramic images and a global navigation satellite system (GNSS) receiver (or a prism reflector) for positioning. A rigorous calibration procedure is developed for PPIMS, as well as a bundle adjustment method to solve for the platform exterior orientation parameters (EOPs) which then allows the image EOPs to be calculated. Experimental results demonstrate that PPIMS mapping accuracy can be better than 13 mm, making it comparable with traditional methods but much more efficient in the measuring process. Numéro de notice : A2018-224 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/phor.12236 Date de publication en ligne : 10/04/2018 En ligne : https://doi.org/10.1111/phor.12236 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=90044 [article]

Geometric model and assessment of a dual‐fisheye imaging system / Mariana Batista Campos in Photogrammetric record, vol 33 n° 162 (June 2018)  

Public [article]  inPhotogrammetric record > vol 33 n° 162 (June 2018) . - pp 243 - 263 Titre : Geometric model and assessment of a dual‐fisheye imaging system Type de document : Article/Communication Auteurs : Mariana Batista Campos, Auteur ; Antonio Maria Garcia Tommaselli, Auteur ; José Marcato, Auteur ; Eija Honkavaara, Auteur Année de publication : 2018 Article en page(s) : pp 243 - 263 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] chambre panoramique [Termes IGN] compensation par faisceaux [Termes IGN] élément d'orientation interne [Termes IGN] étalonnage de chambre métrique [Termes IGN] lentille [Termes IGN] panorama sphérique Résumé : (Auteur) This paper presents a technique for the calibration of a 360° dual imaging system (Ricoh Theta S) composed of two cameras with fisheye lenses specially mounted in a common structure. The experiments are based on calibration with a bundle adjustment using the equidistant fisheye lens model and relative orientation stability constraints, such as distance, base elements and rotation matrix between individual cameras’ coordinate systems. As a result, an equidistant mathematical model using the Conrady–Brown lens distortion model was shown to be suitable for estimating the interior and relative orientation parameters of the Ricoh Theta S. The main contribution presented in this work is a simultaneous bundle adjustment approach with stability constraints on base elements and rotation matrix angles, which achieved accuracies comparable with conventional photogrammetric calibration with perspective cameras. Numéro de notice : A2018-225 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/phor.12240 Date de publication en ligne : 15/05/2018 En ligne : https://doi.org/10.1111/phor.12240 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=90046 [article]

Smartphone‐based close‐range photogrammetric assessment of spherical objects / Inés Barbero‐García in Photogrammetric record, vol 33 n° 162 (June 2018)  

Public [article]  inPhotogrammetric record > vol 33 n° 162 (June 2018) . - pp 283 - 299 Titre : Smartphone‐based close‐range photogrammetric assessment of spherical objects Type de document : Article/Communication Auteurs : Inés Barbero‐García, Auteur ; Miriam Cabrelles, Auteur ; José Luis Lerma, Auteur ; Ángel Marqués‐Mateu, Auteur Année de publication : 2018 Article en page(s) : pp 283 - 299 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie terrestre [Termes IGN] coin réflecteur [Termes IGN] modélisation 3D [Termes IGN] objet [Termes IGN] orientation relative [Termes IGN] photogrammétrie métrologique [Termes IGN] points homologues [Termes IGN] téléphone intelligent Résumé : (Auteur) Smartphones have widened the possibilities for low‐cost close‐range image acquisition for three‐dimensional (3D) modelling. They allow the rapid acquisition of large amounts of data for a wide range of applications. However, the accuracy of the models and the automation possibilities depend on the image acquisition conditions and application requirements. In this study, the accuracy and reliability of the derived photogrammetric 3D models are evaluated on a spherical set‐up for close‐range applications (c.30 cm). Different numbers of images, network configurations, targets, devices and camera calibration methodologies are tested and evaluated. Results show that for this close‐range application high accuracy (0·2 mm) and reliability can be achieved. The number of images did not significantly affect the accuracy but was vital for tie‐point detection and image orientation. The use of artificial targets was found to be the key factor in increasing the final accuracy. In contrast, the image calibration strategy and the characteristics of the imaging device did not have a great impact on the results. Numéro de notice : A2018-226 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/phor.12243 Date de publication en ligne : 22/05/2018 En ligne : https://doi.org/10.1111/phor.12243 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=90047 [article]