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Simultaneous registration of gnomonic projections and central perspectives / Luigi Barazzetti in Photogrammetric record, vol 29 n° 147 (September - November 2014)  

Public [article]  inPhotogrammetric record > vol 29 n° 147 (September - November 2014) . - pp 278 - 296 Titre : Simultaneous registration of gnomonic projections and central perspectives Type de document : Article/Communication Auteurs : Luigi Barazzetti, Auteur ; Mattia Previtali, Auteur ; Marco Scaioni, Auteur Année de publication : 2014 Article en page(s) : pp 278 - 296 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] compensation par faisceaux [Termes IGN] image panoramique [Termes IGN] orientation d'image [Termes IGN] photogrammétrie terrestre [Termes IGN] projection gnomonique [Termes IGN] traitement automatique d'images Résumé : (Auteur) An innovative methodology that combines central perspectives and panoramic gnomonic projections into an integrated bundle block adjustment is discussed. The use of both kinds of images generates metric products with a superior level of detail (image resolution) compared with conventional central perspectives alone, whilst achieving the accuracy of the latter. The entire methodology is intended as a low-cost solution to improving the ground sampling distance over that achievable with single exposures by conventional modern terrestrial cameras. Very high-resolution close-range images can be automatically generated and oriented with a rigorous multi-step procedure that integrates both types of images within a unified least squares adjustment. The advantages and disadvantages of the proposed approach are analysed from both theoretical and practical points of view and illustrated through a series of examples. Numéro de notice : A2014-489 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/phor.12062 Date de publication en ligne : 18/09/2014 En ligne : https://doi.org/10.1111/phor.12062 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=74078 [article]

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Evaluation of structure from motion for soil microtopography measurement / Sayjro K. Nouwakpo in Photogrammetric record, vol 29 n° 147 (September - November 2014)  

Public [article]  inPhotogrammetric record > vol 29 n° 147 (September - November 2014) . - pp 297 - 316 Titre : Evaluation of structure from motion for soil microtopography measurement Type de document : Article/Communication Auteurs : Sayjro K. Nouwakpo, Auteur ; Mike R. James, Auteur ; Mark A. Weltz, Auteur ; et al., Auteur Année de publication : 2014 Article en page(s) : pp 297 - 316 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques [Termes IGN] érosion [Termes IGN] microtopographie [Termes IGN] semis de points [Termes IGN] structure-from-motion Résumé : (Auteur) Recent developments in low-cost structure-from-motion (SfM) technologies offer new opportunities for geoscientists to acquire high-resolution soil microtopography data at a fraction of the cost of conventional techniques. However, these new methodologies often lack easily accessible error metrics and hence are difficult to evaluate. In this research, a framework was developed to evaluate a SfM approach for soil microtopography measurement through assessment of uncertainty sources and quantification of their potential impact on overall 3D reconstruction. Standard deviations of camera interior orientation parameters estimated from SfM self-calibration within five different soil surface models were several orders of magnitude larger than precisions expected from pattern-based camera calibration. Sensitivity analysis identified the principal point position as the dominant source of calibration-induced uncertainty. Overall, surface elevation values estimated from both technologies were similar in magnitude with a root mean square (RMS) of elevation difference of 0·2 mm. Nevertheless, the presence of deformation in either SfM or traditional photogrammetric point clouds highlights the importance of quality assurance safeguards (such as a judicious choice of control points) in SfM workflows for soil microtopography applications. Numéro de notice : A2014-490 Affiliation des auteurs : non IGN Thématique : IMAGERIE/POSITIONNEMENT Nature : Article DOI : 10.1111/phor.12072 Date de publication en ligne : 18/09/2014 En ligne : https://doi.org/10.1111/phor.12072 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=74079 [article]

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Stereo-imaging network design for precise and dense 3D reconstruction / Ali Hosseininaveh Ahmadabadian in Photogrammetric record, vol 29 n° 147 (September - November 2014)  

Public [article]  inPhotogrammetric record > vol 29 n° 147 (September - November 2014) . - pp 317 - 336 Titre : Stereo-imaging network design for precise and dense 3D reconstruction Type de document : Article/Communication Auteurs : Ali Hosseininaveh Ahmadabadian, Auteur ; S. Robson, Auteur ; Jan Böhm , Auteur ; et al., Auteur Année de publication : 2014 Article en page(s) : pp 317 - 336 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] angle de visée [Termes IGN] modèle stéréoscopique [Termes IGN] photogrammétrie terrestre [Termes IGN] reconstruction 3D [Termes IGN] système de référence local Résumé : (Auteur) This paper presents a novel stereo-imaging network design strategy comprising four steps: datum definition, optimum distance estimation, candidate camera position generation, and lastly clustering and selection of vantage viewpoints. An approximate 3D mesh model of an object from a quick low-cost system is used in the first step of the method. An ellipsoid is fitted to the rough model in order to find a suitable imaging distance regarding range- and visibility-related constraints for a stereopair. Next, a set of viewpoints is provided taking into account the ellipsoid and the calculated distance. Finally, camera positions and orientations are defined by clustering and choosing the vantage viewpoints. A system, called “imaging network designer” (IND), has been developed based on this method and is evaluated with two different tests. Results show that IND can provide an imaging network, which fulfils the expected precision for the entire object. Numéro de notice : A2014-491 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/phor.12076 Date de publication en ligne : 18/09/2014 En ligne : https://doi.org/10.1111/phor.12076 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=74080 [article]

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A practical target recognition system for close range photogrammetry / M.R. Shortis in Photogrammetric record, vol 29 n° 147 (September - November 2014)  

Public [article]  inPhotogrammetric record > vol 29 n° 147 (September - November 2014) . - pp 337 - 355 Titre : A practical target recognition system for close range photogrammetry Type de document : Article/Communication Auteurs : M.R. Shortis, Auteur ; James W. Seager, Auteur Année de publication : 2014 Article en page(s) : pp 337 - 355 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques [Termes IGN] coordonnées polaires [Termes IGN] détection automatique [Termes IGN] détection de cible [Termes IGN] photogrammétrie terrestre Résumé : (Auteur)This paper presents details of a coded target system that employs polar coordinate transformation and segment matching to automatically recognise and identify targets in digital images. The code system is based on a square surrounding the central circular target and is described at a level of detail that would allow the system to be readily duplicated. Pre-detection processes, developed to improve the success rate under unfavourable conditions, and the tests conducted to validate a correct target match, are described. Finally, the paper includes some examples of the use of the coded targets, drawn from a variety of calibration and measurement applications. Numéro de notice : A2014-92 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/phor.12070 Date de publication en ligne : 18/09/2014 En ligne : https://doi.org/10.1111/phor.12070 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=74081 [article]

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