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State of the art in high density image matching / Fabio Remondino in Photogrammetric record, vol 29 n° 146 (June - August 2014)  

Public [article]  inPhotogrammetric record > vol 29 n° 146 (June - August 2014) . - pp 144 - 166 Titre : State of the art in high density image matching Type de document : Article/Communication Auteurs : Fabio Remondino, Auteur ; Maria Grazia, Auteur ; Erica Nocerino, Auteur ; Fabio Menna, Auteur ; Francesco Nex, Auteur Année de publication : 2014 Article en page(s) : pp 144 - 166 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image [Termes IGN] analyse comparative [Termes IGN] appariement d'images [Termes IGN] axe de prise de vue [Termes IGN] état de l'art [Termes IGN] image aérienne [Termes IGN] image terrestre [Termes IGN] logiciel de traitement d'image [Termes IGN] semis de points Résumé : (Auteur) Image matching has a history of more than 50 years, with the first experiments performed with analogue procedures for cartographic and mapping purposes. The recent integration of computer vision algorithms and photogrammetric methods is leading to interesting procedures which have increasingly automated the entire image-based 3D modelling process. Image matching is one of the key steps in 3D modelling and mapping. This paper presents a critical review and analysis of four dense image-matching algorithms, available as open-source and commercial software, for the generation of dense point clouds. The eight datasets employed include scenes recorded from terrestrial and aerial blocks, acquired with convergent and normal (parallel axes) images, and with different scales. Geometric analyses are reported in which the point clouds produced with each of the different algorithms are compared with one another and also to ground-truth data. Numéro de notice : A2014-278 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/phor.12063 Date de publication en ligne : 15/06/2014 En ligne : https://doi.org/10.1111/phor.12063 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=33181 [article]

Registration and visualisation of deformation maps from terrestrial radar interferometry using photogrammetry and structure from motion / Rafael Caduff in Photogrammetric record, vol 29 n° 146 (June - August 2014)  

Public [article]  inPhotogrammetric record > vol 29 n° 146 (June - August 2014) . - pp 167 - 186 Titre : Registration and visualisation of deformation maps from terrestrial radar interferometry using photogrammetry and structure from motion Type de document : Article/Communication Auteurs : Rafael Caduff, Auteur ; Dirk Rieke-Zapp, Auteur Année de publication : 2014 Article en page(s) : pp 167 - 186 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image radar et applications [Termes IGN] analyse comparative [Termes IGN] caméra numérique [Termes IGN] chambre métrique [Termes IGN] déformation d'image [Termes IGN] image terrestre [Termes IGN] interférométrie radar terrestre [Termes IGN] photogrammétrie numérique [Termes IGN] propagation d'erreur [Termes IGN] recalage d'image [Termes IGN] semis de points Résumé : (Auteur) This paper describes a general workflow for the registration of terrestrial radar interferometric data with 3D point clouds derived from terrestrial photogrammetry and structure from motion. After the determination of intrinsic and extrinsic orientation parameters, data obtained by terrestrial radar interferometry were projected on point clouds and then on the initial photographs. Visualisation of slope deformation measurements on photographs provides an easily understandable and distributable information product, especially of inaccessible target areas such as steep rock walls or in rockfall run-out zones. The suitability and error propagation of the referencing steps and final visualisation of four approaches are compared: (a) the classic approach using a metric camera and stereo-image photogrammetry; (b) images acquired with a metric camera, automatically processed using structure from motion; (c) images acquired with a digital compact camera, processed with structure from motion; and (d) a markerless approach, using images acquired with a digital compact camera using structure from motion without artificial ground control points. The usability of the completely markerless approach for the visualisation of high-resolution radar interferometry assists the production of visualisation products for interpretation. Numéro de notice : A2014-279 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/phor.12058 Date de publication en ligne : 15/06/2014 En ligne : https://doi.org/10.1111/phor.12058 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=33182 [article]

Automatic reconstruction of regular buildings using a shape-based balloon snake model / Diaro Yari in Photogrammetric record, vol 29 n° 146 (June - August 2014)  

Public [article]  inPhotogrammetric record > vol 29 n° 146 (June - August 2014) . - pp 187 - 205 Titre : Automatic reconstruction of regular buildings using a shape-based balloon snake model Type de document : Article/Communication Auteurs : Diaro Yari, Auteur ; Mehdi Mokhtarzade, Auteur ; Hamid Ebadi, Auteur Année de publication : 2014 Article en page(s) : pp 187 - 205 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique [Termes IGN] détection de contours [Termes IGN] détection du bâti [Termes IGN] image numérique [Termes IGN] modèle géométrique du bâti [Termes IGN] reconstruction 3D du bâti Résumé : (Auteur) Buildings are regarded as the most prominent man-made objects: hence, their automatic extraction from aerial and satellite images has attracted the interest of photogrammetric research communities. In this paper, a balloon snake, a well-known active contour model, was developed for the precise extraction of building boundaries. Traditional active contours are highly sensitive to image data and are problematic when building boundaries are weakened, usually due to occlusions. To improve the efficiency of the traditional balloon snake model, a shape-based balloon snake model was introduced where knowledge about the expected geometrical shape of buildings was modelled and applied to the traditional snake representation. Implementation of the proposed algorithm confirmed its efficiency in the precise extraction of building boundaries. Experimental results and the qualitative and quantitative evaluations demonstrate the potential of the proposed shape-based balloon snake model and its superiority over traditional models. Numéro de notice : A2014-280 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/phor.12060 Date de publication en ligne : 15/06/2014 En ligne : https://doi.org/10.1111/phor.12060 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=33183 [article]

Development of a new stereo-panorama system based on off-the-shelf stereo cameras / Amir Shahrokh Amini in Photogrammetric record, vol 29 n° 146 (June - August 2014)  

Public [article]  inPhotogrammetric record > vol 29 n° 146 (June - August 2014) . - pp 206 - 223 Titre : Development of a new stereo-panorama system based on off-the-shelf stereo cameras Type de document : Article/Communication Auteurs : Amir Shahrokh Amini, Auteur ; Masood Varshosaz, Auteur ; Mohammad Saadatseresht, Auteur Année de publication : 2014 Article en page(s) : pp 206 - 223 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique [Termes IGN] image panoramique [Termes IGN] mesure géométrique [Termes IGN] modèle stéréoscopique [Termes IGN] modélisation 3D Résumé : (Auteur) There exist a number of techniques which are used to produce stereo panoramas, each of which has its own advantages and disadvantages. In this paper, a new stereo-panorama generating system is presented which uses off-the-shelf stereo cameras. In addition to stereoviewing, the system offers the possibility of making geometric measurements. The benefits of such a system are: (a) overcoming the effects of moving objects in the images; (b) increased automation of matching and stitching; (c) simple geometric information extraction; and (d) equal resolution over the whole stereo panorama. The structure of the system is described, including system implementation, calibration, stereo-panorama generation, georeferencing, co-registration of multiple panoramas and 3D measurements. In addition, an experiment to evaluate the capability of the system in modelling 3D environments is reported. Evaluation results show that the system can produce a suitable 3D panoramic environment for the simultaneous 3D visualisation and measurement of objects, especially in urban areas. Numéro de notice : A2014-281 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/phor.12059 Date de publication en ligne : 15/06/2014 En ligne : https://doi.org/10.1111/phor.12059 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=33184 [article]

Assessment of interferometric DEMs from TerraSAR-X stripmap and spotlight stereopairs: case study in Istanbul / G. Seferick Umut in Photogrammetric record, vol 29 n° 146 (June - August 2014)  

Public [article]  inPhotogrammetric record > vol 29 n° 146 (June - August 2014) . - pp 224 - 240 Titre : Assessment of interferometric DEMs from TerraSAR-X stripmap and spotlight stereopairs: case study in Istanbul Type de document : Article/Communication Auteurs : G. Seferick Umut, Auteur ; Naci Yastikli, Auteur Année de publication : 2014 Article en page(s) : pp 224 - 240 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image radar et applications [Termes IGN] analyse comparative [Termes IGN] couple stéréoscopique [Termes IGN] image radar moirée [Termes IGN] image TerraSAR-X [Termes IGN] Istanbul (Turquie) [Termes IGN] mode spotlight [Termes IGN] modèle numérique de terrain [Termes IGN] photographie aérienne Résumé : (Auteur) TerraSAR-X (TSX) has led to a new era for synthetic aperture radar (SAR) imaging, offering high-resolution (1 m) data that was not previously available from space. The TSX X-band sensor can be operated in three interferometrically compatible imaging modes: Stripmap (SM), high-resolution Spotlight (HS) and ScanSAR. Due to the low resolution of ScanSAR (16 to 30 m), SM and HS images are preferred for resolution-based applications. This paper attempts to validate and compare the digital elevation models (DEMs) derived from TSX SM and HS image pairs. Digital surface models (DSMs) were generated by interferometry in a part of Istanbul with a variety of ground types. These DSMs were converted to DEMs by filtering and then compared with a reference DEM produced from aerial photographs. The quality assessment was performed using advanced analyses concerned with accuracy and morphologic detail. The results of both absolute and relative accuracy analyses clearly reveal that the quality of the TSX HS DEM is better than SM and very consistent with the reference model. Numéro de notice : A2014-282 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/phor.12062 Date de publication en ligne : 15/06/2014 En ligne : https://doi.org/10.1111/phor.12062 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=33185 [article]