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Building occlusion detection from ghost images / Guoqing Zhou in IEEE Transactions on geoscience and remote sensing, vol 55 n° 2 (February 2017)  

Public [article]  inIEEE Transactions on geoscience and remote sensing > vol 55 n° 2 (February 2017) . - pp 1074 - 1084 Titre : Building occlusion detection from ghost images Type de document : Article/Communication Auteurs : Guoqing Zhou, Auteur ; Yuefeng Wang, Auteur ; Tao Yue, Auteur Année de publication : 2017 Article en page(s) : pp 1074 - 1084 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique [Termes descripteurs IGN] correction d'image [Termes descripteurs IGN] détection de contours [Termes descripteurs IGN] détection de partie cachée [Termes descripteurs IGN] image fantôme [Termes descripteurs IGN] orthoimage [Termes descripteurs IGN] orthoimage intégrale [Termes descripteurs IGN] zone tampon Résumé : (Auteur) This paper proposes a novel occlusion detection method for urban true orthophoto generation. In this new method, occlusion detection is performed using a ghost image; this method is therefore considerably different from the traditional Z-buffer method, in which occlusion detection is performed during the generation of a true orthophoto (to avoid ghost image occurrence). In the proposed method, a model is first established that describes the relationship between each ghost image and the boundary of the corresponding building occlusion, and then an algorithm is applied to identify the occluded areas in the ghost images using the building displacements. This theory has not previously been applied in true orthophoto generation. The experimental results demonstrate that the method proposed in this paper is capable of effectively avoiding pseudo-occlusion detection, with a success rate of 99.2%, and offers improved occlusion detection accuracy compared with the traditional Z-buffer detection method. The advantage of this method is that it avoids the shortcoming of performing occlusion detection and true orthophoto generation simultaneously, which results in false visibility and false occlusions; instead, the proposed method detects occlusions from ghost images and therefore provides simple and effective true orthophoto generation. Numéro de notice : A2017-146 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern En ligne : http://dx.doi.org/10.1109/TGRS.2016.2619184 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=84634 [article]

Tiltan's automated geo-mapping (AGM) system: A highly integrated airborne image data acquisition & processing system / Gordon Petrie in Geoinformatics, vol 14 n° 2 (01/03/2011)

Public [article]  inGeoinformatics > vol 14 n° 2 (01/03/2011) . - pp 22 - 26 Titre : Tiltan's automated geo-mapping (AGM) system: A highly integrated airborne image data acquisition & processing system Type de document : Article/Communication Auteurs : Gordon Petrie, Auteur Année de publication : 2011 Article en page(s) : pp 22 - 26 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes descripteurs IGN] acquisition d'images [Termes descripteurs IGN] données lidar [Termes descripteurs IGN] image aérienne oblique [Termes descripteurs IGN] lasergrammétrie [Termes descripteurs IGN] logiciel de traitement d'image [Termes descripteurs IGN] modèle 3D de l'espace urbain [Termes descripteurs IGN] modèle stéréoscopique [Termes descripteurs IGN] orthoimage intégrale Résumé : (Auteur) In cooperation with Diamond Airborne Sensing, the Tiltan company has developed a highly integrated airborne image data acquisition and photogrammetric processing system. This utilizes digital frame images that have been acquired employing the step framing principle in a convergent oblique mode to produce its stereo-coverage of the terrain. The overlapping stereo-images can then be used to produce true orthophotos and 3D urban models using highly automated photogrammetric image processing techniques. Numéro de notice : A2011-062 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30843 [article]

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Orthoimage creation of extremely high buildings / G. Zhou in IEEE Transactions on geoscience and remote sensing, vol 46 n° 12 (December 2008)

Public [article]  inIEEE Transactions on geoscience and remote sensing > vol 46 n° 12 (December 2008) . - pp 4132 - 4141 Titre : Orthoimage creation of extremely high buildings Type de document : Article/Communication Auteurs : G. Zhou, Auteur ; W. Xie, Auteur ; P. Cheng, Auteur Année de publication : 2008 Article en page(s) : pp 4132 - 4141 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Orthophotographie, orthoimage [Termes descripteurs IGN] contrainte géométrique [Termes descripteurs IGN] Denver [Termes descripteurs IGN] fonction orthogonale [Termes descripteurs IGN] orthoimage intégrale [Termes descripteurs IGN] orthorectification [Termes descripteurs IGN] point d'appui [Termes descripteurs IGN] superposition d'images [Termes descripteurs IGN] tour (bâtiment) Résumé : (Auteur) This paper presents a method for creating orthoimage in the urban area of extremely high buildings. The proposed method in this paper is different from the traditional methods, which improved the accuracy by increasing the number and/or improved the geometric distribution of ground control points. This proposed method first established a mathematical model of constraint condition on the building edges, such as perpendicularity, and then the established constraint conditions are merged into the orthorectification model. A test field located in downtown of Denver, CO, has been used to evaluate our methods. The experiments of comparing the accuracy achieved by our method and other methods are conducted. The experimental results demonstrated that the proposed method can improve the accuracy of 2-5 ft for those buildings of over 100 m high and even 5-7 ft for those buildings over 100 m high in the margin of imagery. Copyright IEEE Numéro de notice : A2008-487 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29556 [article]

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Extracting urban road networks from high-resolution true orthoimage and Lidar / J. Youn in Photogrammetric Engineering & Remote Sensing, PERS, vol 74 n° 2 (February 2008)

Public [article]  inPhotogrammetric Engineering & Remote Sensing, PERS > vol 74 n° 2 (February 2008) . - pp 227 - 237 Titre : Extracting urban road networks from high-resolution true orthoimage and Lidar Type de document : Article/Communication Auteurs : J. Youn, Auteur ; J. Bethel, Auteur ; et al., Auteur Année de publication : 2008 Article en page(s) : pp 227 - 237 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques [Termes descripteurs IGN] classification dirigée [Termes descripteurs IGN] données lidar [Termes descripteurs IGN] extraction automatique [Termes descripteurs IGN] lasergrammétrie [Termes descripteurs IGN] orthoimage intégrale [Termes descripteurs IGN] réseau routier [Termes descripteurs IGN] segmentation en régions [Termes descripteurs IGN] zone urbaine Résumé : (Auteur) Automated or semi-automated feature extraction from remotely collected, large scale image data has been a challenging issue in digital photogrammetry for many years. In the feature extraction field, fusing different types of data to provide complementary information about the objects is becoming increasingly important. In this paper, we present a newly developed approach for the automatic extraction of urban area road networks from a true orthoimage and lidar assuming the road network to be a semi-grid pattern. The proposed approach starts from the subdivision of a study area into small regions based on homogeneity of the dominant road directions from the true orthoimage. Each region’s road candidates are selected with a proposed free passage measure. This process is called the “acupuncture” method. Features around the road candidates are used as key factors for an advanced “acupuncture method” called the region-based acupuncture method. Extracted road candidates are edited to avoid collocation with non-road features such as buildings and grass fields. In order to produce a building map for the prior step, a first-last return analysis and morphological filter are used with the lidar point cloud. A grass area thematic map is generated by supervised classification techniques from a synthetic image, which contains the three color bands from the true orthoimage and the lidar intensity value. Those non-road feature maps are used as a blocking mask for the roads. The accuracy of the result is evaluated quantitatively with respect to manually compiled road vectors, and a completeness of 80 percent and a correctness of 79 percent are obtained with the proposed algorithm on an area of 1,081,600 square meters. Copyright ASPRS Numéro de notice : A2008-047 Thématique : IMAGERIE Nature : Article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29042 [article]

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Generation of mosaiced digital true orthophotographs from multispectral and Lidar data / N. Balic in International Journal of Remote Sensing IJRS, vol 28 n°15-16 (August 2007)

Public [article]  inInternational Journal of Remote Sensing IJRS > vol 28 n°15-16 (August 2007) . - pp 3679 - 3688 Titre : Generation of mosaiced digital true orthophotographs from multispectral and Lidar data Type de document : Article/Communication Auteurs : N. Balic, Auteur ; H. Weinacker, Auteur ; B. Koch, Auteur Année de publication : 2007 Article en page(s) : pp 3679 - 3688 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Orthophotographie, orthoimage [Termes descripteurs IGN] données lidar [Termes descripteurs IGN] image multibande [Termes descripteurs IGN] logiciel de traitement d'image [Termes descripteurs IGN] mosaïquage d'images [Termes descripteurs IGN] orthoimage intégrale [Termes descripteurs IGN] orthophotoplan numérique Résumé : (Auteur) A software program has been developed to generate true orthophotographs using multispectral and lidar data. To accomplish this, the obscured points were first identified in the acquired conventional orthophotographs. Next, the obscured points were replaced with corresponding unobscured points from the neighbouring orthophotographs. Finally, the resulting orthophotographs were merged into a mosaic. This paper provides insight into the generation procedure, developed methods and results obtained in the course of the creation of the digital true orthophotograph. Copyright Taylor & Francis Numéro de notice : A2007-359 Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28722 [article]

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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)

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LiDAR-derived high quality ground control information and DEM for image orthorectification / X. Liu in Geoinformatica, vol 11 n° 1 (March - May 2007)

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Occlusion-compensated true orthorectification for high-resolution satellite images / L.C. Chen in Photogrammetric record, vol 22 n° 117 (March - May 2007)

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New methodologies for true orthophoto generation / A.F. Habib in Photogrammetric Engineering & Remote Sensing, PERS, vol 73 n° 1 (January 2007)

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Towards 3D map generation from digital aerial images / L. Zebelin in ISPRS Journal of photogrammetry and remote sensing, vol 60 n° 6 (September 2006)

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Developing a true ortho technique using a digital mapping camera / K. Yamada in Geoinformatics, vol 7 n° 8 (01/12/2004)

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True orthoimage generation in urban areas with very tall buildings / G. Zhou in International Journal of Remote Sensing IJRS, vol 25 n° 22 (November 2004)

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Utilisation de modèles numériques de terrain haute résolution pour la simulation des écoulements en milieu urbain / Salah Lahlah (2004)

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Digital Lagerichtige orthophotos und Lidar-hohenmodelle / U. Lohr in GIS Geo-Informations-Systeme, vol 2003 n° 3 (März 2003)

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Fabrication de vraies ortho-images et correction des ombres / Didier Boldo in Bulletin d'information scientifique et technique de l'IGN, n° 74 (mars 2003)

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