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Topological gradient connection analysis for feature detection / Chao-Yuan Lo in Photogrammetric record, vol 28 n° 141 (March - May 2013)  

Public [article]  inPhotogrammetric record > vol 28 n° 141 (March - May 2013) . - pp 7 - 26 Titre : Topological gradient connection analysis for feature detection Type de document : Article/Communication Auteurs : Chao-Yuan Lo, Auteur ; Lieng-Chien Chen, Auteur Année de publication : 2013 Article en page(s) : pp 7 - 26 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique [Termes IGN] analyse comparative [Termes IGN] connexité (topologie) [Termes IGN] détection de contours [Termes IGN] extraction de traits caractéristiques [Termes IGN] filtre de Canny [Termes IGN] gradient [Termes IGN] ligne caractéristique [Termes IGN] lissage de courbe [Termes IGN] niveau de gris (image) [Termes IGN] relation topologique Résumé : (Auteur) Edges and corners are two major image features in the modelling of man-made objects; an edge provides strong geometric orientation and corners possess good localisation. Feature detection is the basis of image processing for numerous applications such as image registration and object modelling. Completeness and localisation are the two major considerations for these applications; however, illumination, reflectance and shadows may interfere with image grey values to produce various gradients along an edge. Thus, threshold selection is an important step in obtaining suitable features in target-dependent methods as improper selection might cause information loss and broken edges. Instead of threshold selection, this study therefore proposes a feature extraction method using topological gradient connection (TGC) analysis involving three steps: grey value refinement, gradient computation and topological connection analysis. The first step uses a Gaussian filter to smooth the grey value image. The second step computes directional gradients to identify ridge pixels and collect feature candidates. The third step analyses adjacent candidates based on the criterion of topological connection. This three-step tracing procedure combines these connected candidates into a single object. The proposed scheme employs different images derived from various sensors and compares them with the Canny operator (using manually selected thresholds) and manually plotted corners for detection ability assessment. Experimental results indicate that the automatic results are more complete for subtle feature lines than the Canny edges. In addition, the proposed method provides higher flexibility in selecting suitable feature layers for different applications. Numéro de notice : A2013-149 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/j.1477-9730.2012.00703.x Date de publication en ligne : 16/12/2012 En ligne : https://doi.org/10.1111/j.1477-9730.2012.00703.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32287 [article]

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Virtual worlds for photogrammetric image-based simulation and learning / Eduardo J. Piatti in Photogrammetric record, vol 28 n° 141 (March - May 2013)  

Public [article]  inPhotogrammetric record > vol 28 n° 141 (March - May 2013) . - pp 27 - 42 Titre : Virtual worlds for photogrammetric image-based simulation and learning Type de document : Article/Communication Auteurs : Eduardo J. Piatti, Auteur ; José Luis Lerma, Auteur Année de publication : 2013 Article en page(s) : pp 27 - 42 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques [Termes IGN] données localisées 3D [Termes IGN] image aérienne [Termes IGN] image virtuelle [Termes IGN] monde virtuel [Termes IGN] restitution [Termes IGN] simulation [Termes IGN] visualisation 3D Résumé : (Auteur) Simulation is a common activity in many fields and pursuits, not only for teaching but also for learning, training, monitoring, research and entertainment, among others. This paper presents the criteria used to develop virtual scenarios for photogrammetric simulation based on both synthetic objects and synthetic images. The workflow used to generate three-dimensional (3D) virtual worlds is presented together with the subsequent reconstruction of the metric perspective images (synthetic scenes) emulating any type of frame camera in any kind of terrestrial or aerial set-up, the latter with an aeroplane, helicopter or unmanned aerial vehicle (UAV). A simulator can be used to create 3D virtual worlds in order to improve an understanding of mission planning, generate synthetic image sequences with suitable overlaps, as well as optimising image data acquisition before undertaking expensive photogrammetric surveys in the field. Numéro de notice : A2013-150 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/phor.12001 Date de publication en ligne : 29/01/2013 En ligne : https://doi.org/10.1111/phor.12001 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32288 [article]

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XXIInd [22nd] international congress of photogrammetry and remote sensing / Paul R. Newby in Photogrammetric record, vol 28 n° 141 (March - May 2013)  

Public [article]  inPhotogrammetric record > vol 28 n° 141 (March - May 2013) . - pp 43 - 73 Titre : XXIInd [22nd] international congress of photogrammetry and remote sensing Type de document : Article/Communication Auteurs : Paul R. Newby, Éditeur scientifique ; Simon J. Buckley, Auteur ; Ian J. Downman, Auteur ; Jane E. Drummond, Auteur ; et al., Auteur Année de publication : 2013 Article en page(s) : pp 43 - 73 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie [Termes IGN] photogrammétrie Résumé : (Auteur) The XXIInd International Congress of Photogrammetry and Remote Sensing was held at the Melbourne Convention and Exhibition Centre, Victoria, Australia, from 25th August to 1st September 2012. Reports are given on the Congress as a whole, including the General Assembly, Plenary and Special sessions, some Technical Commission activities and the Congress Exhibition. Papers from the Congress are published in Volume XXXIX of the International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences and Volume I of the new ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences. Numéro de notice : A2013-151 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/phor.12014 Date de publication en ligne : 27/03/2013 En ligne : https://doi.org/10.1111/phor.12014 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32289 [article]

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Inner constraints for planar features / Derek D. Lichti in Photogrammetric record, vol 28 n° 141 (March - May 2013)  

Public [article]  inPhotogrammetric record > vol 28 n° 141 (March - May 2013) . - pp 74 - 85 Titre : Inner constraints for planar features Type de document : Article/Communication Auteurs : Derek D. Lichti, Auteur ; Jacky C. K. Chow, Auteur Année de publication : 2013 Article en page(s) : pp 74 - 85 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie [Termes IGN] auto-étalonnage [Termes IGN] compensation par moindres carrés [Termes IGN] contrainte géométrique [Termes IGN] plan (géométrie) [Termes IGN] télémétrie laser terrestre Résumé : (Auteur) Geometric features, planes in particular, have recently replaced signalised points as the object space primitives of choice for a number of fundamental terrestrial laser scanner data processing tasks such as registration, self-calibration and deformation monitoring. The inner constraints for planes are developed in this paper owing to their importance as the optimal means of datum definition. Pertinent least squares adjustment results from several terrestrial laser scanner datasets are presented to demonstrate the impact of planar inner constraints on registration and self-calibration. When solution quality is measured in terms of parameter precision and correlation, it is demonstrated that the planes should be constrained for both laser scanner registration and self-calibration with a basic additional parameter set. Numéro de notice : A2013-152 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/j.1477-9730.2012.00700.x Date de publication en ligne : 16/12/2012 En ligne : https://doi.org/10.1111/j.1477-9730.2012.00700.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32290 [article]

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Correlation analysis of camera self-calibration in close range photogrammetry / Rongfu Tang in Photogrammetric record, vol 28 n° 141 (March - May 2013)  

Public [article]  inPhotogrammetric record > vol 28 n° 141 (March - May 2013) . - pp 86 - 95 Titre : Correlation analysis of camera self-calibration in close range photogrammetry Type de document : Article/Communication Auteurs : Rongfu Tang, Auteur ; Dieter Fritsch, Auteur Année de publication : 2013 Article en page(s) : pp 86 - 95 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] auto-étalonnage [Termes IGN] corrélation [Termes IGN] déformation d'image [Termes IGN] étalonnage de chambre métrique [Termes IGN] photogrammétrie métrologique Résumé : (Auteur) While the Brown self-calibration model has been widely used in close range photogrammetry for over 40 years, the negative effects of the well-known high correlations between parameters are not clear. This paper presents a novel view and study of these correlations, which are shown to be inherent in the Brown model due to its polynomial nature; they occur exactly as with additional parameters in aerial photogrammetry. Although it has high correlations with the decentring distortion parameters, the principal point can be located precisely (up to a few pixels) in self-calibration with an appropriate image configuration. An alternative model of the in-plane distortion is proposed, which helps to reduce the correlation with principal distance. Numéro de notice : A2013-153 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/phor.12009 Date de publication en ligne : 27/03/2013 En ligne : https://doi.org/10.1111/phor.12009 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32291 [article]

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Accuracy assessment of commercial self-calibrating bundle adjustment routines applied to archival aerial photography / Manuel Angel Aguilar in Photogrammetric record, vol 28 n° 141 (March - May 2013)  

Public [article]  inPhotogrammetric record > vol 28 n° 141 (March - May 2013) . - pp 96 - 114 Titre : Accuracy assessment of commercial self-calibrating bundle adjustment routines applied to archival aerial photography Type de document : Article/Communication Auteurs : Manuel Angel Aguilar, Auteur ; Fernando José Aguilar, Auteur ; Ismael Fernadez, Auteur Année de publication : 2013 Article en page(s) : pp 96 - 114 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie [Termes IGN] archives [Termes IGN] auto-étalonnage [Termes IGN] compensation par faisceaux [Termes IGN] erreur systématique [Termes IGN] estimation de précision [Termes IGN] image aérienne [Termes IGN] Leica Photogrammetry Suite Résumé : (Auteur) The use of archival or historical photography for photogrammetric purposes often involves a lack of data concerning the aerial cameras employed, difficulties in identifying control points on the photos and inappropriate conservation of the photography. When camera calibration parameters are unknown, they should be estimated by means of a self-calibrating bundle adjustment. Several calibration models available in the Leica Photogrammetry Suite software have been tested on two archival datasets, captured in 1956 and 1977, covering the same working area. The accuracy of the dataset triangulation was found to depend significantly on the self-calibration method and the number of ground control points used; when the latter ranged from six to nine per stereopair, self-calibrating bundle adjustment techniques were found to slightly, but not always significantly, improve the photogrammetric capability of archival aerial photography. Thus, the adoption of self-calibration cannot guarantee the improvement of results when working on poorly conserved imagery. Results from such datasets are very dependent on numerous local variables which cannot be extrapolated to other areas for the same camera since each dataset is unique and may present systematic errors of a different nature. Numéro de notice : A2013-154 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/phor.12009 Date de publication en ligne : 17/12/2012 En ligne : https://doi.org/10.1111/phor.12009 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32292 [article]

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