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Development of German-Ukrainian cooperations for education and research in photogrammetry and laser scanning / Thomas Luhmann in Geo-spatial Information Science, vol 24 n° 1 (March 2021)  

Public [article]  inGeo-spatial Information Science > vol 24 n° 1 (March 2021) . - pp 152 - 159 Titre : Development of German-Ukrainian cooperations for education and research in photogrammetry and laser scanning Type de document : Article/Communication Auteurs : Thomas Luhmann, Auteur Année de publication : 2021 Article en page(s) : pp 152 - 159 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Formation [Termes IGN] Allemagne [Termes IGN] apprentissage en ligne [Termes IGN] balayage laser [Termes IGN] coopération internationale [Termes IGN] enseignement supérieur [Termes IGN] formation à distance [Termes IGN] modélisation 3D [Termes IGN] photogrammétrie [Termes IGN] recherche scientifique [Termes IGN] semis de points [Termes IGN] traitement de semis de points [Termes IGN] Ukraine Résumé : (Auteur) Since 2011 an intensive international cooperation has been in place between the Institute for Applied Photogrammetry and Geoinformatics (IAPG) at the Jade University of Applied Sciences in Oldenburg, Germany, and various Ukrainian universities. Following an initial contact by Prof. Gottfried Konecny, the first visit was organized, and was followed by many more. In subsequent years an intensive cooperation was established particularly with the National University for Construction and Architecture (KNUCA) in Kiev. In addition to architects and civil engineers, KNUCA also trains geodesists, geo-information scientists and landscape planners. The cooperation today includes the reciprocal exchange of scientists and students, research projects, courses and cooperation at many other levels. In addition, a commercial company has been established, SPM3D LLC, which now employs more than 14 engineers in the field of 3D acquisition, point cloud processing and modeling. This article summarizes the history of the cooperation and presents the results of associated student projects. In addition, results of joint work on the development of a virtual laser scanner are presented, part of a German-Ukrainian initiative to digitize teaching. Numéro de notice : A2021-299 Affiliation des auteurs : non IGN Thématique : IMAGERIE/SOCIETE NUMERIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/10095020.2020.1831891 Date de publication en ligne : 13/10/2020 En ligne : https://doi.org/10.1080/10095020.2020.1831891 Format de la ressource électronique : URL Article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=97384 [article]

Close-range photogrammetry and 3D imaging / Thomas Luhmann (2019)  

Public Titre : Close-range photogrammetry and 3D imaging Type de document : Guide/Manuel Auteurs : Thomas Luhmann, Auteur ; Stuart Robson, Auteur ; Stephen Kyle, Auteur ; Jan Böhm , Auteur Editeur : Berlin, New York : Walter de Gruyter Année de publication : 2019 Importance : 822 p. Format : 17 x 24 cm ISBN/ISSN/EAN : 978-3-11-060724-6 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique [Termes IGN] analyse d'image numérique [Termes IGN] étalonnage [Termes IGN] image 3D [Termes IGN] instrument de photogrammétrie [Termes IGN] logiciel de photogrammétrie [Termes IGN] modélisation 3D [Termes IGN] orientation d'image [Termes IGN] photogrammétrie métrologique [Termes IGN] précision des mesures [Termes IGN] reconstruction 3D [Termes IGN] transformation mathématique Index. décimale : 33.30 Photogrammétrie numérique Résumé : (Editeur) This is the third edition of the well-known guide to close-range photogrammetry. It provides a thorough presentation of the methods, mathematics, systems and applications which comprise the subject of close-range photogrammetry, which uses accurate imaging techniques to analyse the three-dimensional shape of a wide range of manufactured and natural objects. Note de contenu : 1. Introduction 2. Mathematical fundamentals 3. Imaging technology 4. Analytical methods 5. Digital image analysis 6. Measuring tasks and systems 7. Measurement design and quality 8. Example applications Numéro de notice : 26341 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Manuel de cours DOI : 10.1515/9783110607253 En ligne : https://doi.org/10.1515/9783110607253 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=95700

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Sensor modelling and camera calibration for close-range photogrammetry / Thomas Luhmann in ISPRS Journal of photogrammetry and remote sensing, vol 115 (May 2016)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 115 (May 2016) . - pp 37 – 46 Titre : Sensor modelling and camera calibration for close-range photogrammetry Type de document : Article/Communication Auteurs : Thomas Luhmann, Auteur ; Clive Simpson Fraser, Auteur ; Hans-Gerd Maas, Auteur Année de publication : 2016 Article en page(s) : pp 37 – 46 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique [Termes IGN] capteur aérien [Termes IGN] capteur spatial [Termes IGN] étalonnage d'instrument [Termes IGN] étalonnage de capteur (imagerie) [Termes IGN] étalonnage de chambre métrique [Termes IGN] photogrammétrie terrestre Résumé : (auteur) Metric calibration is a critical prerequisite to the application of modern, mostly consumer-grade digital cameras for close-range photogrammetric measurement. This paper reviews aspects of sensor modelling and photogrammetric calibration, with attention being focussed on techniques of automated self-calibration. Following an initial overview of the history and the state of the art, selected topics of current interest within calibration for close-range photogrammetry are addressed. These include sensor modelling, with standard, extended and generic calibration models being summarised, along with non-traditional camera systems. Self-calibration via both targeted planar arrays and targetless scenes amenable to SfM-based exterior orientation are then discussed, after which aspects of calibration and measurement accuracy are covered. Whereas camera self-calibration is largely a mature technology, there is always scope for additional research to enhance the models and processes employed with the many camera systems nowadays utilised in close-range photogrammetry. Numéro de notice : A2016-543 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2015.10.006 En ligne : https://doi.org/10.1016/j.isprsjprs.2015.10.006 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=81689 [article]

Eccentricity in images of circular and spherical targets and its impact on spatial intersection / Thomas Luhmann in Photogrammetric record, vol 29 n° 148 (December 2014 - February 2015)  

Public [article]  inPhotogrammetric record > vol 29 n° 148 (December 2014 - February 2015) . - pp 417– 433 Titre : Eccentricity in images of circular and spherical targets and its impact on spatial intersection Type de document : Article/Communication Auteurs : Thomas Luhmann, Auteur Année de publication : 2014 Article en page(s) : pp 417– 433 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique [Termes IGN] cible réfléchissante [Termes IGN] déformation géométrique [Termes IGN] espace image [Termes IGN] modèle géométrique de prise de vue [Termes IGN] modélisation 3D [Termes IGN] projection perspective Résumé : (Auteur) A behaviour of perspective projection which causes eccentricity in the image measurement of circular and spherical targets is discussed. While it is commonly known that flat circular targets can have a significant displacement of the elliptical image centre with respect to the true circle centre, it can also be shown that a similar effect also exists for spherical targets. Both types of target images exhibit elliptical characteristics. If measurement methods such as best-fitting ellipses are used to detect the target, the calculated ellipse centre does not correspond to the desired target centre in 3D space. This paper firstly discusses the use and measurement of circular and spherical targets. It then describes the geometrical projection model in order to demonstrate the eccentricity in image space which, based on numerical simulations, is further quantified and investigated. Finally, the resulting effect in 3D space is estimated for stereo- and multi-image intersections. It is shown that the eccentricity is larger than usually assumed, and must be compensated for in high-accuracy applications. Furthermore, spherical targets do not display better results than circular targets. Numéro de notice : A2014-648 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/phor.12084 Date de publication en ligne : 16/12/2014 En ligne : https://doi.org/10.1111/phor.12084 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=75094 [article]

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