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A hybrid measurement approach for close-range photogrammetry / Clive Simpson Fraser in ISPRS Journal of photogrammetry and remote sensing, vol 64 n° 3 (May - June 2009)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 64 n° 3 (May - June 2009) . - pp 328 - 333 Titre : A hybrid measurement approach for close-range photogrammetry Type de document : Article/Communication Auteurs : Clive Simpson Fraser, Auteur ; S. Cronk, Auteur Année de publication : 2009 Article en page(s) : pp 328 - 333 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie terrestre [Termes IGN] étalonnage de capteur (imagerie) [Termes IGN] étalonnage géométrique [Termes IGN] extraction automatique [Termes IGN] extraction de traits caractéristiques [Termes IGN] photogrammétrie métrologique [Termes IGN] visualisation 3D Résumé : (Auteur) Full automation in close-range photogrammetric measurement has long been a practical reality. However, constraints apply to the process such that automated 3D measurement is generally confined to targeted points in an environment of controlled illumination. The ready availability of consumer-grade digital cameras has made photogrammetric measurement accessible and more widely employed for a host of new applications, the majority of which call for 3D measurement of other than signalized object features. Process automation is therefore typically precluded. This paper discusses a hybrid measurement approach which involves fully automatic network orientation with targets, while at the same time supporting follow-up semi-automatic and manual operations such as feature point and line extraction and surface measurement via image matching. The topics discussed include camera calibration, the metric exploitation of colour attributes, issues related to image point correspondence determination, operator assisted feature measurement and surface extraction. All are important to the practical realisation of the hybrid measurement approach. Copyright ISPRS Numéro de notice : A2009-249 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2008.09.009 En ligne : https://doi.org/10.1016/j.isprsjprs.2008.09.009 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29879 [article]

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Automated metric calibration of colour digital cameras / S. Cronk in Photogrammetric record, vol 21 n° 116 (December 2006 - February 2007)  

Public [article]  inPhotogrammetric record > vol 21 n° 116 (December 2006 - February 2007) . - pp 355 - 372 Titre : Automated metric calibration of colour digital cameras Type de document : Article/Communication Auteurs : S. Cronk, Auteur ; Clive Simpson Fraser, Auteur ; H. Hanley, Auteur Année de publication : 2006 Article en page(s) : pp 355 - 372 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] aberration chromatique [Termes IGN] automatisation [Termes IGN] caméra numérique [Termes IGN] compensation par faisceaux [Termes IGN] étalonnage de chambre métrique [Termes IGN] image en couleur [Termes IGN] image RVB [Termes IGN] orientation externe [Termes IGN] orientation relative Résumé : (Auteur) Consumer-grade digital cameras have become commonplace and with calibration there is significant potential for their use in photogrammetric applications. This paper describes a new method for automatic camera calibration, which is suited to colour digital cameras. Two innovations are central to the developed process. The first is exploitation of RGB colour attributes in the design of automatically detected and identified coded targets. The second is a new approach to initial value determination for relative orientation, which then supports fully automatic initial network exterior orientation and subsequent bundle adjustment with self-calibration. Accuracy aspects are also touched upon and the impact of chromatic aberration is discussed. Finally, an example of the automatic calibration process, which is implemented in the iWitness system, is presented for the case of multiple zoom settings of a consumer-grade digital camera. Copyright RS&PS + Blackwell Publishing Numéro de notice : A2006-542 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/j.1477-9730.2006.00380.x En ligne : https://doi.org/10.1111/j.1477-9730.2006.00380.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28265 [article]

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