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Multi-view performance capture of surface details / Nadia Robertini in International journal of computer vision, vol 124 n° 1 (August 2017)
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[article]
Titre : Multi-view performance capture of surface details Type de document : Article/Communication Auteurs : Nadia Robertini, Auteur ; Dan Casas, Auteur ; Edilson De Aguiar, Auteur ; Christian Theobalt, Auteur Année de publication : 2017 Article en page(s) : pp 96 – 113 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique
[Termes descripteurs IGN] courbe de Gauss
[Termes descripteurs IGN] échelle d'intensité
[Termes descripteurs IGN] image numérique
[Termes descripteurs IGN] image vidéo
[Termes descripteurs IGN] maille triangulaire
[Termes descripteurs IGN] modèle de déformation des images
[Termes descripteurs IGN] niveau de détail
[Termes descripteurs IGN] noeud
[Termes descripteurs IGN] optimisation (mathématiques)
[Termes descripteurs IGN] reconstruction d'objetRésumé : (auteur) This paper presents a novel approach to recover true fine surface detail of deforming meshes reconstructed from multi-view video. Template-based methods for performance capture usually produce a coarse-to-medium scale detail 4D surface reconstruction which does not contain the real high-frequency geometric detail present in the original video footage. Fine scale deformation is often incorporated in a second pass by using stereo constraints, features, or shading-based refinement. In this paper, we propose an alternative solution to this second stage by formulating dense dynamic surface reconstruction as a global optimization problem of the densely deforming surface. Our main contribution is an implicit representation of a deformable mesh that uses a set of Gaussian functions on the surface to represent the initial coarse mesh, and a set of Gaussians for the images to represent the original captured multi-view images. We effectively find the fine scale deformations for all mesh vertices, which maximize photo-temporal-consistency, by densely optimizing our model-to-image consistency energy on all vertex positions. Our formulation yields a smooth closed form energy with implicit occlusion handling and analytic derivatives. Furthermore, it does not require error-prone correspondence finding or discrete sampling of surface displacement values. We demonstrate our approach on a variety of datasets of human subjects wearing loose clothing and performing different motions. We qualitatively and quantitatively demonstrate that our technique successfully reproduces finer detail than the input baseline geometry. Numéro de notice : A2017-401 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article En ligne : https://doi.org/10.1007/s11263-016-0979-1 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=85943
in International journal of computer vision > vol 124 n° 1 (August 2017) . - pp 96 – 113[article]Density-based clustering for data containing two types of points / Tao Pei in International journal of geographical information science IJGIS, vol 29 n° 2 (February 2015)
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Titre : Density-based clustering for data containing two types of points Type de document : Article/Communication Auteurs : Tao Pei, Auteur ; Weiyi Wang, Auteur ; Hengcai Zhang, Auteur ; et al., Auteur Année de publication : 2015 Article en page(s) : pp 175 - 193 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale
[Termes descripteurs IGN] analyse en composantes indépendantes
[Termes descripteurs IGN] classification par seuillage sur la limite la plus proche
[Termes descripteurs IGN] densité d'information
[Termes descripteurs IGN] échelle d'intensité
[Termes descripteurs IGN] groupe
[Termes descripteurs IGN] taxi
[Termes descripteurs IGN] transport routierRésumé : (Auteur) When only one type of point is distributed in a region, clustered points can be seen as an anomaly. When two different types of points coexist in a region, they overlap at different places with various densities. In such cases, the meaning of a cluster of one type of point may be altered if points of the other type show different densities within the same cluster. If we consider the origins and destinations (OD) of taxicab trips, the clustering of both in the morning may indicate a transportation hub, whereas clustered origins and sparse destinations (a hot spot where taxis are in short supply) could suggest a densely populated residential area. This cannot be identified by previous clustering methods, so it is worthwhile studying a clustering method for two types of points. The concept of two-component clustering is first defined in this paper as a group containing two types of points, at least one of which exhibits clustering. We then propose a density-based method for identifying two-component clusters. The method is divided into four steps. The first estimates the clustering scale of the point data. The second transforms the point data into the 2D density domain, where the x and y axes represent the local density of each type of point around each point, respectively. The third determines the thresholds for extracting the clusters, and the fourth generates two-component clusters using a density-connectivity mechanism. The method is applied to taxicab trip data in Beijing. Three types of two-component clusters are identified: high-density origins and destinations, high-density origins and low-density destinations, and low-density origins and high-density destinations. The clustering results are verified by the spatial relationship between the cluster locations and their land-use types over different periods of the day. Numéro de notice : A2015-577 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/13658816.2014.955027 En ligne : http://www.tandfonline.com/doi/full/10.1080/13658816.2014.955027 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=77839
in International journal of geographical information science IJGIS > vol 29 n° 2 (February 2015) . - pp 175 - 193[article]
Titre : Escala Macrosísmica Europea EMS-98 Titre original : [Echelle Macrosismique Européenne EMS-98] Type de document : Monographie Auteurs : G. Grunthal, Editeur scientifique Editeur : Luxembourg : Conseil de l'Europe Année de publication : 2009 Collection : Cahiers du Centre Européen de Géodynamique et de Séismologie num. 27 Importance : 100 p. Format : 16 x 23 cm ISBN/ISSN/EAN : 9-78919-89701-8 Langues : Espagnol (spa) Descripteur : [Vedettes matières IGN] Géophysique interne
[Termes descripteurs IGN] bâtiment
[Termes descripteurs IGN] dommage matériel
[Termes descripteurs IGN] échelle d'intensité
[Termes descripteurs IGN] risque naturel
[Termes descripteurs IGN] séisme
[Termes descripteurs IGN] vulnérabilitéNote de contenu : CONTRIBUYENTES EN EL PROCESO DE ESTABLECIMIENTO DE LA ESCALA MACROSISMICA EUROPEA (EMS)
INTRODUCCION
ESCALA DE INTENSIDAD MACROSISMICA
DIRECTRICES Y MATERIAL DE REFERENCIA
1 Asignando intcnsidades
1.1 La naturaleza de la intensidad
1.2 La estructura de la escala de intensidad EM-98
1.2.1 Tipos de edificios y clases de vulnerabilidades
1.2.2 Grades de dano
1.2.3 Cantidades
1.3 Intcnsidad y localizacion
1.4 Estableciendo el grado
1.5 Uso de information negativa
1.6 Inferencias invalidas
1.7 Edificios altos y otros casos especiales
1.8 Efectos debidos a condiciones de suelo
1.9 Notacion
2 Vulnerabilidad
2.1 Vulncrabilidad dc edificios en cscalas de intensidad - una perspectiva historica
2.2 Tipos de edificios y la Tabla de Vulnerabilidad
2.2.1 Comentarios generales sobre la rcsistencia a terremotos
2.2.2 Estructuras de mamposteria
2.2.2.1 Paredes de pena viva / roca de cantera
2.2.2.2 Adobe / ladrillo de tierra
2.2.2.3 Roca simple
2.2.2.4 Roca masiva
2.2.2.5 Ladrillo no reforzado / bloques de hormigon
2.2.2.6 Ladrillo no reforzado con pisos dc HA
2.2.2.7 Ladrillo reforzado y mamposteria confinada
2.2.3 Estructuras de hormigon armado
2.2.3.1 Estructuras de armazon dc hormigon armado
2.2.3.2 Estructuras dc muros de hormigon armado
2.2.4 Estructuras de acero
2.2.5 Estructuras de madera
2.3 Factores que afectan a la vulnerabilidad sísmica de edificios
2.3.1 Calidad y fabricación
2.3.2 Estado de preservación
2.3.3 Regularidad
2.3.4 Ductilidad
2.3.5 Localización
2.3.6 Refuerzo
2.3.7 Diseño sismoresistente (DSR)
2.3.7.1 DSR consistente con el código
2.3.7.2 Importancia
2.3.7.3 Nivel final (real) de DSR y clase de vulnerabilidad
2.4 Asignando la clase de vulnerabilidad
2.5 Comentarios sobre la introducción de nuevos tipos de edificios
3 Asignando la intensidad en base a registros históricos
3.1 Datos históricos y documentales
3.2 Tipos de edificios (clases de vulnerabilidad) en registros históricos
3.3 Número total de edificios
3.4 Calidad de las descripciones
3.5 Daños a monumentos
4 El uso de escalas de intensidad
4.1 Intensidades observadas y extrapoladas
4.2 Correlaciones con parámetros de movimiento de suelo
4.3 Correlación con otras escalas
4.4 Calidad de la determinación de intensidades y muestras de datos
4.5 Calidad e incertidumbre
4.6 Curvas de daño
4.7 Limitaciones de las escalas de doce grados
4.8 El supuesto grado "desaparecido" de la escala MSK
5 Ejemplos ilustrativos de la clasificación de daños a tipos de edificios
6 Ejemplos de asignación de intensidades
7 Efectos en entornos naturales
8 Versión abreviada de la EMS-98Numéro de notice : 10527 Affiliation des auteurs : non IGN Nature : Monographie Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=62464 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 10527-01 47.10 Livre Centre de documentation En réserve 2S (M-103) Disponible The recognition of road network from high-resolution satellite remotely sensed data using image morphological characteristics / C. Zhu in International Journal of Remote Sensing IJRS, vol 26 n° 24 (December 2005)
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Titre : The recognition of road network from high-resolution satellite remotely sensed data using image morphological characteristics Type de document : Article/Communication Auteurs : C. Zhu, Auteur ; Wei Shi, Auteur ; et al., Auteur Année de publication : 2005 Article en page(s) : pp 5493 - 5508 Note générale : Bibliographie Langues : Français (fre) Descripteur : [Vedettes matières IGN] Traitement d'image optique
[Termes descripteurs IGN] analyse visuelle
[Termes descripteurs IGN] appariement de formes
[Termes descripteurs IGN] échelle d'intensité
[Termes descripteurs IGN] extraction du réseau routier
[Termes descripteurs IGN] image à haute résolution
[Termes descripteurs IGN] image Ikonos
[Termes descripteurs IGN] morphologie mathématique
[Termes descripteurs IGN] niveau de gris (image)
[Termes descripteurs IGN] précision géométrique (imagerie)
[Termes descripteurs IGN] reconnaissance de formes
[Termes descripteurs IGN] réseau routier
[Termes descripteurs IGN] segment de droiteRésumé : (Auteur) With the development of remote sensors and satellite technologies, high-resolution satellite data such as IKONOS images have been available recently. By these new high resolution satellite data, remote sensing technologies can be successfully applied to more application areas such as extracting road network from high resolution satellite images. This paper proposes a newly developed approach to extract a road network from high resolution satellite images. The approach is based on the binary and greyscale mathematical morphology and a line segment match method. First, the outline of road network is detected based on the grey morphological characteristics. Then, the basic road network is detected by the line segment match method. Next, the detected basic road network is processed based on the knowledge about the roads and binary mathematical morphological methods. Finally, visual analysis and three indicators are used to evaluate the accuracy of the extracted road networks. The results of the accuracy evaluation demonstrate that the developed road network extraction approach can provide both good visual effect and high positional accuracy. Numéro de notice : A2005-523 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27659
in International Journal of Remote Sensing IJRS > vol 26 n° 24 (December 2005) . - pp 5493 - 5508[article]Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 080-05241 RAB Revue Centre de documentation En réserve 3L Exclu du prêt Gradation as a communication device in area-class maps / B. Kronenfeld in Cartography and Geographic Information Science, vol 32 n° 4 (October 2005)
[article]
Titre : Gradation as a communication device in area-class maps Type de document : Article/Communication Auteurs : B. Kronenfeld, Auteur Année de publication : 2005 Article en page(s) : pp 231 - 241 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes descripteurs IGN] carte choroplèthe
[Termes descripteurs IGN] cartologie
[Termes descripteurs IGN] communication cartographique
[Termes descripteurs IGN] échelle d'intensité
[Termes descripteurs IGN] erreur de géocodage
[Vedettes matières IGN] CartologieRésumé : (Auteur) This paper proposes a methodology to assess gradation as a cartographic tool for communicating information in area-class maps. The communication model is used as a theoretical foundation, suggesting distinction between errors that occur in encoding and decoding of geographic information. The proposed methodology begins with the determination of a target level of encoding error. Map alternatives are constrained to achieve this target, with gradation considered as one variable in the map production process. The result is a series of maps of equal encoding accuracy but varying in the degree of gradation represented. The individual maps of the series can then be evaluated in terms of decoding accuracy. The methodology is demonstrated by producing a series of alternative forest region maps of New York, Pennsylvania, and New jersey based on U.S. Forest Service data on tree genus distributions. The series ranges from a 4-class graded area-class map to a 13-class crisp map. The results show gradation to be a viable alternative to the proliferation of map classes as a means of cartographic communication. Numéro de notice : A2005-529 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27665
in Cartography and Geographic Information Science > vol 32 n° 4 (October 2005) . - pp 231 - 241[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 032-05041 RAB Revue Centre de documentation En réserve 3L Disponible 032-05042 RAB Revue Centre de documentation En réserve 3L Disponible PermalinkPermalinkPermalinkProceedings of the workshop Application of artificial intelligence techniques in seismology and engineering seismology / G. Zonno (1992)
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