Centre de documentation
scientifique

Dépouillements

Linear feature detection using multi-resolution wavelet filters / S.P. Kozaitis in Photogrammetric Engineering & Remote Sensing, PERS, vol 71 n° 6 (June 2005)  

Public [article]  inPhotogrammetric Engineering & Remote Sensing, PERS > vol 71 n° 6 (June 2005) . - pp 689 - 697 Titre : Linear feature detection using multi-resolution wavelet filters Type de document : Article/Communication Auteurs : S.P. Kozaitis, Auteur ; R.H. Cofer, Auteur Année de publication : 2005 Article en page(s) : pp 689 - 697 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image [Termes IGN] analyse multiéchelle [Termes IGN] analyse multirésolution [Termes IGN] détection automatique [Termes IGN] filtre numérique [Termes IGN] géométrie différentielle [Termes IGN] image aérienne [Termes IGN] route [Termes IGN] transformation en ondelettes Résumé : (Auteur) We detected road pixels in aerial imagery using a multiresolution, wavelet-based approach. Our method involved the description of a differential geometry approach for road seed pixel detection in terms of wavelet transforms. Using this approach allowed us to extend the differential geometry approach to incorporate multiple scales. We found that using multiple scales significantly reduced the number of potential false positives. Our approach seemed to work well with a computer-assisted approach where the "seed" or potential pixels of interest should have a high confidence level of being correct. We found that our approach led to an effective method for detecting roads in aerial imagery. Our method is general, and in principle could be applied to other filtering techniques besides the one used here. Numéro de notice : A2005-218 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.71.6.689 En ligne : https://doi.org/10.14358/PERS.71.6.689 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27355 [article]

Photogrammetric and Lidar data registration using linear features / A. Habib in Photogrammetric Engineering & Remote Sensing, PERS, vol 71 n° 6 (June 2005)  

Public [article]  inPhotogrammetric Engineering & Remote Sensing, PERS > vol 71 n° 6 (June 2005) . - pp 699 - 707 Titre : Photogrammetric and Lidar data registration using linear features Type de document : Article/Communication Auteurs : A. Habib, Auteur ; M. Ghanma, Auteur ; et al., Auteur Année de publication : 2005 Article en page(s) : pp 699 - 707 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique [Termes IGN] cohérence des données [Termes IGN] compensation par faisceaux [Termes IGN] détection de changement [Termes IGN] données lidar [Termes IGN] données multicapteurs [Termes IGN] espace objet [Termes IGN] ligne caractéristique [Termes IGN] méthode robuste [Termes IGN] modélisation 3D [Termes IGN] objet géographique linéaire [Termes IGN] reconstruction 3D [Termes IGN] superposition de données [Termes IGN] système de référence local Résumé : (Auteur) The enormous increase in the volume of datasets acquired by lidar systems is leading towards their extensive exploitation in a variety of applications, such as, surface reconstruction, city modeling, and generation of perspective views. Though being a fairly new technology, lidar has been influenced by and had a significant impact on photogrammetry. Such an influence or impact can be attributed to the complementary nature of the information provided by the two systems. For example, photogrammetric processing of imagery produces accurate information regarding object space break lines (discontinuities). On the other hand, lidar provides accurate information describing homogeneous physical surfaces. Hence, it proves logical to combine data from the two sensors to arrive at a more robust and complete reconstruction of 3D objects. This paper introduces alternative approaches for the registration of data captured by photogrammetric and lidar systems to a common reference frame. The first approach incorporates lidar features as control for establishing the datum in the photogrammetric bundle adjustment. The second approach starts by manipulating the photogrammetric imagery to produce a 3D model, including a set of linear features along object space discontinuities, relative to an arbitrarily chosen coordinate system. Afterwards, conjugate photogrammetric and lidar straightline features are used to establish the transformation between the arbitrarily chosen photogrammetric coordinate system and the lidar reference frame. The second approach (bundle adjustment, followed by similarity transformation) is general enough to be applied for the co-registration of multiple three-dimensional datasets regardless of their origin (e.g., adjacent lidar strips, surfaces in Gis databases, and temporal elevation data). The registration procedure would allow for the identification of inconsistencies between the surfaces in question. Such inconsistencies might arise from changes taking place within the object space or inaccurate calibration of the internal characteristics of the lidar and the photogrammetric systems. Therefore, the proposed methodology is useful for change detection and system calibration applications. Experimental results from aerial and terrestrial datasets proved the feasibility of the suggested methodologies. Numéro de notice : A2005-219 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.71.6.699 En ligne : https://doi.org/10.14358/PERS.71.6.699 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27356 [article]

A photogrammetric method for single image orientation and measurement / Antonio Maria Garcia Tommaselli in Photogrammetric Engineering & Remote Sensing, PERS, vol 71 n° 6 (June 2005)  

Public [article]  inPhotogrammetric Engineering & Remote Sensing, PERS > vol 71 n° 6 (June 2005) . - pp 727 - 732 Titre : A photogrammetric method for single image orientation and measurement Type de document : Article/Communication Auteurs : Antonio Maria Garcia Tommaselli, Auteur ; M.L. Lopes-Reiss, Auteur Année de publication : 2005 Article en page(s) : pp 727 - 732 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie spatiale [Termes IGN] équation linéaire [Termes IGN] espace objet [Termes IGN] image isolée [Termes IGN] image numérique [Termes IGN] matrice de rotation [Termes IGN] orientation interne [Termes IGN] surface plane Résumé : (Auteur) The aim of this paper is to present a photogrammetric method for determining the dimensions of flat surfaces, such as billboards, based on a single digital image. A mathematical model was adapted to generate linear equations for vertical and horizontal lines in the object space. These lines are identified and measured in the image and the rotation matrix is computed using an indirect method. The distance between the camera and the surface is measured using a lasermeter, providing the coordinates of the camera perspective center. Eccentricity of the lasermeter center related to the camera perspective center is modeled by three translations, which are computed using a calibration procedure. Some experiments were performed to test the proposed method and the achieved results are within a relative error of about 1 percent in areas and distances in the object space. This accuracy fulfills the requirements of the intended applications. Numéro de notice : A2005-220 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.71.6.727 En ligne : https://doi.org/10.14358/PERS.71.6.727 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27357 [article]

Stability analysis and geometric calibration of off-the-shelf digital cameras / A. Habib in Photogrammetric Engineering & Remote Sensing, PERS, vol 71 n° 6 (June 2005)  

Public [article]  inPhotogrammetric Engineering & Remote Sensing, PERS > vol 71 n° 6 (June 2005) . - pp 733 - 741 Titre : Stability analysis and geometric calibration of off-the-shelf digital cameras Type de document : Article/Communication Auteurs : A. Habib, Auteur ; M. Morgan, Auteur Année de publication : 2005 Article en page(s) : pp 733 - 741 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] caméra numérique [Termes IGN] chambre CMOS [Termes IGN] chambre DTC [Termes IGN] compensation par faisceaux [Termes IGN] élément d'orientation interne [Termes IGN] étalonnage géométrique [Termes IGN] orientation interne [Termes IGN] stabilité Résumé : (Auteur) Recent developments of digital cameras in terms of the size of a Charged Coupled Device (CCD) and Complementary Metal Oxide Semiconductor (CMOS) arrays, as well as reduced costs, are leading to their applications in traditional and new photogrammetric, surveying, and mapping functions. Such cameras require careful calibration to determine their metric characteristics, as defined by the Interior Orientation Parameters (IOP), which are essential for any photogrammetric activity. Moreover, the stability of the estimated iop of these cameras over short and long time periods has to be analyzed and quantified. This paper outlines the incorporation of straight lines in a bundle adjustment procedure for calibrating off-the-shelf/low-cost digital cameras. A framework for automatic extraction of the straight lines in the images is also presented and tested. In addition, the research introduces new approaches for testing the camera stability, where the degree of similarity between reconstructed bundles using two sets of IOP is quantitatively evaluated. Experimental results with real data proved the feasibility of the line-based self-calibration approach. Analysis of the estimated IOP from various calibration sessions over long time periods revealed the stability of the implemented camera. Numéro de notice : A2005-221 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.71.6.733 En ligne : https://doi.org/10.14358/PERS.71.6.733 Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27358 [article]