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Geometric consistency and stability of consumer-grade digital cameras for accurate spatial measurement / R. Wackrow in Photogrammetric record, vol 22 n° 118 (June - August 2007)  

Public [article]  inPhotogrammetric record > vol 22 n° 118 (June - August 2007) . - pp 121 - 134 Titre : Geometric consistency and stability of consumer-grade digital cameras for accurate spatial measurement Type de document : Article/Communication Auteurs : R. Wackrow, Auteur ; Jim H. Chandler, Auteur ; P. Bryan, Auteur Année de publication : 2007 Article en page(s) : pp 121 - 134 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] analyse comparative [Termes IGN] caméra numérique [Termes IGN] cohérence géométrique [Termes IGN] distorsion d'image [Termes IGN] élément d'orientation interne [Termes IGN] erreur systématique [Termes IGN] étalonnage de capteur (imagerie) [Termes IGN] Leica Photogrammetry Suite [Termes IGN] précision géométrique (imagerie) [Termes IGN] prise de vue terrestre Résumé : (Auteur) It is known that uncertain internal geometry of consumer-grade digital cameras limits the accuracy of data that can be extracted. These cameras can be calibrated, but the validity of calibration data over a period of time should be carefully assessed before subsequent photogrammetric measurement. This paper examines the geometric stability and manufacturing consistency of a typical low-cost digital camera (Nikon Coolpix 5400) by estimating the degree of similarity between interior orientation parameters (IOP), established over a 1-year period. Digital elevation models (DEMs) were extracted with differing IOP, and accuracies were compared using data obtained from seven identical cameras. An independent self-calibrating bundle adjustment (GAP) and the Leica Photogrammetry Suite (LPS) software were used to provide these data-sets. Results are presented that indicate the potential of these cameras to maintain their internal geometry in terms of temporal stability and manufacturing consistency. This study also identifies residual systematic error surfaces or ‘‘domes’’, discernible in ‘‘DEMs of difference’’. These are caused by slightly inaccurately estimated lens distortion parameters, which effectively constrain the accuracies achievable with this class of sensor. Copyright RS&PS + Blackwell Publishing Numéro de notice : A2007-363 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/j.1477-9730.2007.00436.x En ligne : https://doi.org/10.1111/j.1477-9730.2007.00436.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28726 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
106-07021	RAB	Revue	Centre de documentation	En réserve L003	Disponible

A review and analyses of plumb-line calibration / J.L. Lerma in Photogrammetric record, vol 22 n° 118 (June - August 2007)  

Public [article]  inPhotogrammetric record > vol 22 n° 118 (June - August 2007) . - pp 135 - 150 Titre : A review and analyses of plumb-line calibration Type de document : Article/Communication Auteurs : J.L. Lerma, Auteur ; Miriam Cabrelles, Auteur Année de publication : 2007 Article en page(s) : pp 135 - 150 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] caméra numérique [Termes IGN] chambre non métrique [Termes IGN] distorsion radiale [Termes IGN] étalonnage de capteur (imagerie) [Termes IGN] fil à plomb Résumé : (Auteur) Radial and decentring distortion parameters have long been reported as fundamental elements in camera calibration, especially in digital close range photogrammetry. This paper reports on an investigation for the determination of both radial and decentring distortion parameters using analytical plumb-line calibration. Straight line patterns, ranging from 1, 2, 4, 10 and up to 20 lines, not strictly plumb, are examined on a set of distorted imagery. Additionally, not only the number of straight lines but also the linear image distribution is analysed. For that purpose, linear features have been distributed in different positions and orientations over the whole of the imagery. Furthermore, the relationship between the parameters mentioned and the location of the principal point is also analysed, and shows how sensitive they are to deviations from the centre of the sensor. The motivation for this paper is the measurement of the minimum number of linear features for proper calibration of non-metric digital cameras. Both radial and decentring distortion parameters are examined. Finally, some line patterns are recommended for making the plumb-line calibration technique a reliable, easy and fast procedure. Photogrammetrists could use it as a first step in the procedure of camera calibration; users who are not experts in photogrammetry could employ it as a final step. Copyright RS&PS + Blackwell Publishing Numéro de notice : A2007-364 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/j.1477-9730.2007.00412.x En ligne : https://doi.org/10.1111/j.1477-9730.2007.00412.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28727 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
106-07021	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Minimising algorithm-induced artefacts in true ortho-image generation: a direct method implemented in the vector domain / Y. Sheng in Photogrammetric record, vol 22 n° 118 (June - August 2007)  

Public [article]  inPhotogrammetric record > vol 22 n° 118 (June - August 2007) . - pp 151 - 163 Titre : Minimising algorithm-induced artefacts in true ortho-image generation: a direct method implemented in the vector domain Type de document : Article/Communication Auteurs : Y. Sheng, Auteur Année de publication : 2007 Article en page(s) : pp 151 - 163 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] artefact [Termes IGN] détection de partie cachée [Termes IGN] données vectorielles [Termes IGN] orthoimage intégrale Résumé : (Auteur) True ortho-images are generated from perspective images with both object and terrain displacement distortion corrected and with occlusions removed. However, widely used algorithms based on a Z-buffer have drawbacks and may result in artefacts in the generated ortho-images. This paper analyses the artefacts induced by Z-buffer algorithms in true ortho-image generation, and proposes a vector-based method to avoid algorithm-induced artefacts. The proposed method treats a perspective image pixel as a square patch instead of an image pixel point, and generates ortho-images in the vector domain. Under the vector implementation, occlusion detection is a simple process, and image resampling becomes a straightforward procedure. Most importantly, this method can minimise artefacts in the ortho-images so generated. Copyright RS&PS + Blackwell Publishing Numéro de notice : A2007-365 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/j.1477-9730.2007.00425.x En ligne : https://doi.org/10.1111/j.1477-9730.2007.00425.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28728 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
106-07021	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Technical terminology for the photogrammetric community / P.R.T. Newby in Photogrammetric record, vol 22 n° 118 (June - August 2007)  

Public [article]  inPhotogrammetric record > vol 22 n° 118 (June - August 2007) . - pp 164 - 179 Titre : Technical terminology for the photogrammetric community Type de document : Article/Communication Auteurs : P.R.T. Newby, Auteur Année de publication : 2007 Article en page(s) : pp 164 - 179 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie [Termes IGN] photogrammétrie [Termes IGN] terminologie Résumé : (Auteur) The editorial team of The Photogrammetric Record has long felt the need for standardised photogrammetric terminology, in order both to eliminate inconsistency within individual authors’ work and to maintain consistency within the publication over time. To this end a guidance document was produced in 2000–2001 for internal use only. After a succession of revisions this is now published for the first time. It is hoped that, as well as helping authors to prepare papers for submission to the Record, the present list may become widely accepted or, failing that, may lead to correspondence, revision and ultimately a consensus which will be to the benefit of photogrammetrists and those who publish their work worldwide. Copyright RS&PS + Blackwell Publishing Numéro de notice : A2007-366 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/j.1477-9730.2007.00431.x En ligne : https://doi.org/10.1111/j.1477-9730.2007.00431.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28729 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
106-07021	RAB	Revue	Centre de documentation	En réserve L003	Disponible