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Comparative geometric and radiometric evaluation of mobile phone and still video cameras / Devrim Akca in Photogrammetric record, vol 24 n° 127 (September - November 2009)  

Public [article]  inPhotogrammetric record > vol 24 n° 127 (September - November 2009) . - pp 217 - 245 Titre : Comparative geometric and radiometric evaluation of mobile phone and still video cameras Type de document : Article/Communication Auteurs : Devrim Akca, Auteur ; Armin W. Gruen, Auteur Année de publication : 2009 Article en page(s) : pp 217 - 245 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] analyse comparative [Termes IGN] auto-étalonnage [Termes IGN] bruit (théorie du signal) [Termes IGN] caméra vidéo [Termes IGN] fonction de transfert de modulation [Termes IGN] précision géométrique (imagerie) [Termes IGN] précision radiométrique [Termes IGN] téléphonie mobile Résumé : (Auteur) This paper examines the potential of mobile phones to be used as front-end sensors for photogrammetric procedures and applications. For this purpose, two mobile phone cameras (Sony Ericsson K750i and Nokia N93) were calibrated over an indoor 3D testfield, using a self-calibrating bundle adjustment. Geometric accuracy tests were carried out in order to evaluate their metric performances and to compare the results with respect to two off-the-shelf digital still video cameras (Sony DSC W100 and Sony DSC F828). The geometric accuracy evaluation comprised an absolute accuracy test, JPEG test and temporal stability test. The radiometric capabilities of all cameras (except that the DSC W100 was replaced with a DSC T100 camera) were also evaluated and compared by carrying out modulation transfer function (MTF) analysis, image noise analysis and an operating range test. Substantial systematic errors were diagnosed in some systems. However, with proper calibration it is believed that these devices can be used for many photogrammetric tasks. Copyright RS&PS + Blackwell Publishing Numéro de notice : A2009-327 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/j.1477-9730.2009.00541.x En ligne : https://doi.org/10.1111/j.1477-9730.2009.00541.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29957 [article]

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Precise, automatic and fast method for vanishing point detection / Mahzad Kalantari in Photogrammetric record, vol 24 n° 127 (September - November 2009)  

Public [article]  inPhotogrammetric record > vol 24 n° 127 (September - November 2009) . - pp 246 - 263 Titre : Precise, automatic and fast method for vanishing point detection Type de document : Article/Communication Auteurs : Mahzad Kalantari , Auteur ; Franck Jung , Auteur ; Jean Pierre Guedon, Auteur Année de publication : 2009 Article en page(s) : pp 246 - 263 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie terrestre [Termes IGN] cercle (géométrie) [Termes IGN] image terrestre [Termes IGN] méthode robuste [Termes IGN] orientation d'image [Termes IGN] point de fuite Résumé : (Auteur) A new automated approach for vanishing point detection in images of urbanscenes is described. This method is based on the theorem of Thales. The maincontribution of this paper is the automatic and simultaneous detection of allvanishing points of the image, achieved by converting this problem into the detectionof circles in a complex cloud of points, in which each point corresponds to a segmentand is associated with an uncertainty. This extraction of circles uses a RANSACmethod, modified to improve its speed by using accumulation techniques (Houghtransform or otherwise). This robust estimation is then refined by least squares errorpropagation using the individual variances of each segment. The algorithm is robust,its accuracy is optimised and it is entirely automatic. Its successful operation hasbeen tested on a large number of images of varied urban scenes. Numéro de notice : A2009-328 Affiliation des auteurs : LGA+Ext (2009-2011) Autre URL associée : vers HAL Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/j.1477-9730.2009.00542.x Date de publication en ligne : 29/08/2009 En ligne : https://doi.org/10.1111/j.1477-9730.2009.00542.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29958 [article]

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On-the-fly server-based aerial imagery management system / A. Segui in Photogrammetric record, vol 24 n° 127 (September - November 2009)  

Public [article]  inPhotogrammetric record > vol 24 n° 127 (September - November 2009) . - pp 280 - 294 Titre : On-the-fly server-based aerial imagery management system Type de document : Article/Communication Auteurs : A. Segui, Auteur ; J.L. Lerma, Auteur ; S. Navarro, Auteur ; Cristina Portales, Auteur Année de publication : 2009 Article en page(s) : pp 280 - 294 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique [Termes IGN] architecture client-serveur [Termes IGN] géomatique web [Termes IGN] image aérienne [Termes IGN] interface web [Termes IGN] système de gestion de base de données Résumé : (Auteur) Aerial images are valuable products when dealing with both geospatial and geotemporal analysis. Nowadays, they are widely used for many different purposes and by an extensive public, including private companies, official administrations and individual users. Although in the past few years there has been an increasing interest in showing all kinds of geographical information on the World Wide Web, access to aerial imagery and its dissemination are still difficult and lack flexibility. This paper introduces an aerial imagery management system based on client–server principles, operated so as to allow users quick and efficient queries, processing and management of huge sets of photogrammetric imagery stored on raster servers. It is a novel product that is ready to provide image-based cartographic data available in public and private digital warehouses, facilitating all the required visualisations and queries, as well as geometric and radiometric processing on the fly. This paper shows the design, system architecture and various functionalities of the system in a real-life scenario. Copyright RS&PS + Blackwell Publishing Numéro de notice : A2009-329 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1111/j.1477-9730.2009.00539.x En ligne : https://doi.org/10.1111/j.1477-9730.2009.00539.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29959 [article]

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