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Airborne digital imaging technology: a new overview / Gordon Petrie in Photogrammetric record, vol 22 n° 119 (September - November 2007)    

Public [article]  inPhotogrammetric record > vol 22 n° 119 (September - November 2007) . - pp 203 - 225 Titre : Airborne digital imaging technology: a new overview Type de document : Article/Communication Auteurs : Gordon Petrie, Auteur ; A.S. Walker, Auteur Année de publication : 2007 Article en page(s) : pp 203 - 225 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] analyse comparative [Termes IGN] caméra matricielle [Termes IGN] capteur aérien [Termes IGN] capteur en peigne [Termes IGN] capteur imageur [Termes IGN] photogrammétrie numérique Résumé : (Auteur) This paper presents an overview of current developments in the airborne digital imaging technologies - including both digital frame and pushbroom line scanners - and analyses them in the context of their applications to digital photogrammetry. Copyright RS&PS + Blackwell Publishing Numéro de notice : A2007-479 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/j.1477-9730.2007.00446.x En ligne : https://doi.org/10.1111/j.1477-9730.2007.00446.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28842 [article]

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Documents numériques

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An inexpensive stereo-image capture tool for motion study / A.K. Chong in Photogrammetric record, vol 22 n° 119 (September - November 2007)  

Public [article]  inPhotogrammetric record > vol 22 n° 119 (September - November 2007) . - pp 226 - 237 Titre : An inexpensive stereo-image capture tool for motion study Type de document : Article/Communication Auteurs : A.K. Chong, Auteur Année de publication : 2007 Article en page(s) : pp 226 - 237 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] caméra vidéo [Termes IGN] coût [Termes IGN] données localisées [Termes IGN] image 3D [Termes IGN] image multi sources [Termes IGN] objet mobile [Termes IGN] photogrammétrie numérique [Termes IGN] précision des mesures [Termes IGN] vidéo numérique [Termes IGN] visualisation simultanée Résumé : (Auteur) This paper discusses the evaluation of a video stereo-image capture tool for photogrammetric applications. The ‘‘NuView Adapter’’, a commonly available video-image splitting device, and a digital video camera (DV) could be used to capture stereoscopic video footage for many photogrammetric applications in which low-cost near-simultaneous stereo-images are required for 3D viewing or for 3D spatial data capture. Relevant photogrammetric applications might include: aerial surveillance, human/animal motion study (tracking), bank/security surveillance and precise 3D animation. The device permits two distinct views (left and right perspective views) to enter a single lens DV. A single convergence control in the device allows the user to obtain a stereo view of near and far objects. The system is easy to operate and the stereo-images give a good visual 3D effect. Research was carried out to determine the quality of the stereo-image for 3D measurement. The investigation involved: (1) the calibration of a customised system for optimum close range photogrammetric application; and (2) a case study involving motion tracking. A semi-automated monodigitising photogrammetric technique was used to determine the accuracy of the system. The results show that this system could achieve a spatial data accuracy of better than 13 mm at an object distance of 9 m. The horizontal and vertical accuracies are similar to those obtained by the conventional stereoscopic camera technique using a ‘‘normal case’’ configuration with 86% overlap. Copyright RS&PS + Blackwell Publishing Numéro de notice : A2007-480 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/j.1477-9730.2007.00439.x En ligne : https://doi.org/10.1111/j.1477-9730.2007.00439.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28843 [article]

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Determination of optimum window size for SAR image co-registration with decomposition of auto-correlation / W. Zou in Photogrammetric record, vol 22 n° 119 (September - November 2007)  

Public [article]  inPhotogrammetric record > vol 22 n° 119 (September - November 2007) . - pp 238 - 256 Titre : Determination of optimum window size for SAR image co-registration with decomposition of auto-correlation Type de document : Article/Communication Auteurs : W. Zou, Auteur ; Z. Li, Auteur ; X. Ding, Auteur Année de publication : 2007 Article en page(s) : pp 238 - 256 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image radar et applications [Termes IGN] appariement d'images [Termes IGN] autocorrélation [Termes IGN] déformation de la croute terrestre [Termes IGN] fenêtre (informatique) [Termes IGN] image radar moirée [Termes IGN] interféromètrie par radar à antenne synthétique [Termes IGN] modèle numérique de terrain [Termes IGN] points homologues [Termes IGN] transformation en ondelettes Résumé : (Auteur) Interferometric synthetic aperture radar (InSAR) is a promising recent technique for the generation of digital elevation models and/or the measurement of ground surface deformations. In InSAR data processing, the first step is the image co-registration, achieved by using a set of tie points which are the conjugate image points on the master and slave images. Tie points are selected with the aim of finding the conjugate point automatically on the slave image for any given point on the master image, by the process known as image matching. To achieve reliable matching, a set of points within a window is used instead of a single point. The size of the window will affect the reliability of matching. Hitherto there have been no effective methods for the determination of optimum window size for this purpose. In practice, this parameter is determined by experience. In this paper, a pair of SAR images is used to test the effect of window size on the reliability of co-registration. An optimum window size is selected on the basis of the experimental results. The determination of optimum window size for tie point matching is then examined theoretically, leading to a proposal for an automated method based on the auto-correlation of the SAR images, which reflects the similarity between image pixels. The auto-correlation function is decomposed into waves of various frequencies by a wavelet transform. By a combined analysis of the variations of wave amplitudes with frequency, the optimum window size for tie point matching can be determined. A procedure based on the use of Daubechies wavelet db1 is proposed in detail. An optimum window size could be determined in this way for any pair of SAR images. Copyright RS&PS + Blackwell Publishing Numéro de notice : A2007-481 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/j.1477-9730.2007.00443.x En ligne : https://doi.org/10.1111/j.1477-9730.2007.00443.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28844 [article]

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Investigation of physical sensor models for modelling SPOT 3 orbits / T. Kim in Photogrammetric record, vol 22 n° 119 (September - November 2007)  

Public [article]  inPhotogrammetric record > vol 22 n° 119 (September - November 2007) . - pp 257 - 273 Titre : Investigation of physical sensor models for modelling SPOT 3 orbits Type de document : Article/Communication Auteurs : T. Kim, Auteur ; H. Kim, Auteur ; S. Rhee, Auteur Année de publication : 2007 Article en page(s) : pp 257 - 273 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] capteur (télédétection) [Termes IGN] compensation par faisceaux [Termes IGN] erreur géométrique [Termes IGN] étude de faisabilité [Termes IGN] image SPOT [Termes IGN] modélisation géométrique de prise de vue [Termes IGN] orbite précise [Termes IGN] orientation du capteur Résumé : (Auteur) This paper investigates the feasibility of modelling entire image strips, instead of individual scenes, that have been acquired from the same orbital pass through bundle adjustments. The focus differs from previous researches in the following aspects: firstly, in modelling image strips when control points are available only on a small portion of the strips and, secondly, in comparing the performance of two types of physical sensor models with various sets of adjustment parameters. The models tested were based on modified collinear equations and on satellite orbit and attitude. For each model seven adjustment parameter sets were defined and checked against two SPOT 3 strips of 420 km in length. Results showed that the accuracy of orbit modelling is highly dependent on the choice of parameters to be adjusted. Models with high-order parameters showed exponential error patterns whereas models with low-order parameters showed linear error patterns. Among the two types of sensor models, those based on satellite orbit and attitude yielded better orbit modelling performance. In particular, the best performance was achieved by the model that adjusts attitude biases only; a nearly constant accuracy of better than 2 pixels was maintained over the whole orbital segment of 420 km. This supports the feasibility of orbit modelling. Copyright RS&PS + Blackwell Publishing Numéro de notice : A2007-482 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/j.1477-9730.2007.00441.x En ligne : https://doi.org/10.1111/j.1477-9730.2007.00441.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28845 [article]

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