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Dissertations / Theses on the topic 'SPATIAL TEMPORAL DESCRIPTOR'

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Published: 11 September 2023

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1

Megrhi, Sameh. "Spatio-temporal descriptors for human action recognition." Thesis, Paris 13, 2014. http://www.theses.fr/2014PA131046/document.

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L'analyse et l’interprétation de contenus visuels et plus particulièrement la vidéo est un domaine de recherche de plus en plus attractif en raison du nombre important d'applications telles que la vidéo-surveillance, le résumé de films, l'indexation, les jeux vidéo, la robotique et la domotique. Dans cette thèse nous nous intéressons à la détection et à la reconnaissance d'actions humaines dans des séquences vidéo. Pour la partie détection des actions, nous avons introduit deux approches basées sur les points d'intérêts locaux. La première proposition est une méthode simple et efficace qui vis
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2

Mercieca, Julian. "Estimation of temporal and spatio-temporal nonlinear descriptor systems." Thesis, University of Sheffield, 2018. http://etheses.whiterose.ac.uk/19416/.

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As advances in the remote sensing of fluid flows forge ahead at an impressive rate, we face an increasingly compelling question of how best to exploit this progress. Light detection and ranging (LIDAR) measurement equipment still presents the problems of having only radial (line-of-sight) wind speed measurements (Cyclops' dilemma). Substantial expanses of unmeasured flow still remain and range weighting errors have a considerable influence on LIDAR measurements. Clearly, more information needs to be extracted from LIDAR data and an estimation problem naturally arises. A key challenge is that m
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3

Lättman, Håkan. "Description of spatial and temporal distributions of epiphytic lichens." Licentiate thesis, Linköping University, Linköping University, Department of Physics, Chemistry and Biology, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-11561.

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<p>Lichens are, in most cases, sensitive to anthropogenic factors such as air pollution, global warming, forestry and fragmentation. Two studies are included in this thesis. The first is an evaluation of the importance of old oak for the rare epiphytic lichen Cliostomum corrugatum (Ach.) Fr. This study analysed whether C. corrugatum was limited by dispersal or restricted to tree stands with an unbroken continuity or the substrate old oaks. The results provide evidence that the investigated five populations in Östergötland, Sweden, of C. corrugatum exhibit substantial gene flow, an effective di
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4

Lättman, Håkan. "Description of spatial and temporal distributions of epiphytic lichens /." Linköping : [Department of Physics, Chemistry and Biology], Linköping University, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-11561.

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5

Brighi, Marco. "Human Activity Recognition: A Comparative Evaluation of Spatio-Temporal Descriptors." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/19436/.

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The study presented in this thesis aims to implement and evaluate three different features for the recognition of human activities (HAR). A feature is a piece of information appropriately extracted from raw data that is relevant for solving a particular task. With HAR is meant that discipline able to automatically recognize the activity carried out by an agent through the collection of data. These systems can be realized by exploiting data of different kinds and coming from different sources. Within this study, it was decided to use visual data from properly recorded videos. Each feature is a
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6

Whiten, Christopher J. "Probabilistic Shape Parsing and Action Recognition Through Binary Spatio-Temporal Feature Description." Thèse, Université d'Ottawa / University of Ottawa, 2013. http://hdl.handle.net/10393/24006.

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In this thesis, contributions are presented in the areas of shape parsing for view-based object recognition and spatio-temporal feature description for action recognition. A probabilistic model for parsing shapes into several distinguishable parts for accurate shape recognition is presented. This approach is based on robust geometric features that permit high recognition accuracy. As the second contribution in this thesis, a binary spatio-temporal feature descriptor is presented. Recent work shows that binary spatial feature descriptors are effective for increasing the efficiency of obj
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7

Mowbray, Stuart David. "Modelling and extracting periodically deforming objects by continuous, spatio-temporal shape description." Thesis, University of Southampton, 2008. https://eprints.soton.ac.uk/266132/.

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This thesis proposes a new model for describing spatio-temporally deforming objects. Through a novel use of Fourier descriptors, it is shown how arbitrary shape description can be extended to include spatio-temporal shape deformation. It is further demonstrated that these new spatio-temporal Fourier descriptors have the ability to be used as the basis for both the recognition and extraction of deforming objects. Application of this new recognition technique to human gait sequences demonstrates recognition rates of over 86% for individual human subjects, signifying that these descriptors posses
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8

BOUAJJANI, MOHAMMED. "Contribution a l'etude du raisonnement spatio-temporel. Localisation d'un agent et description d'itineraires." Toulouse 3, 1999. http://www.theses.fr/1999TOU30215.

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Cette etude se situe dans le domaine de la representation des connaissances et de la formalisation du raisonnement sur l'action. Notre contribution s'interesse particulierement a la localisation d'un mobile a partir d'une description de son itineraire. Nous considerons une scene constituee d'un ensemble de lieux de reference par rapport auxquels un mobile est localise. Deux relations de localisation sont possibles etre a l'interieur ou etre a l'exterieur d'un lieu. L'itineraire du mobile est decrit a travers sa localisation a differents instants, et a travers des actions de deplacements du typ
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9

Gruhier, Elise. "Spatiotemporal description and modeling of mechanical product and its assembly sequence based on mereotopology : theory, model and approach." Thesis, Belfort-Montbéliard, 2015. http://www.theses.fr/2015BELF0276/document.

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L’objectif de cette thèse est de d’écrire l’évolution du produit dans les trois dimensions (spatiale, temporelle et spatio-temporelle). Dans le contexte industriel actuel, les modèles produit sont considérés uniquement du point de vue spatial pendant la phase de conception et du point de vue temporel pendant la phase d’assemblage. Le manque de lien entre le produit et le process mène à des incompréhensions de définition de produit et entraine de mauvaises interprétations en conception. Cependant, le produit ´évolue à travers le temps et subit des changements tout au long des phases de concepti
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10

Bouchard, Geneviève. "Architecture d'estimateur de canaux pour récepteur à traitement spatio-temporel." Thesis, Université Laval, 2007. http://www.theses.ulaval.ca/2007/24445/24445.pdf.

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11

Luo, Guoliang. "Segmentation de maillages dynamiques et son application pour le calcul de similarité." Thesis, Strasbourg, 2014. http://www.theses.fr/2014STRAD026/document.

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Avec le développement important des techniques d’animation, les maillages animés sont devenus un sujet de recherche important en informatique graphique, comme la segmentation de maillages animés ou la compression. Ces maillages animés qui sont créés à l’aide de logiciels ou à partir de données de capture de mouvements sont composés d’une séquence ordonnée de maillages de forme statique et dont la topologie reste la même (nombre fixe de sommets et de triangles). Bien qu’un grand nombre de travaux ont été menés sur les maillages statiques durant les deux dernières décennies, le traitement et la
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12

Olyott, Leonard James Henry. "A description of spatial and temporal aspects of the lifecycle of chokka squid Loligo vulgaris reynaudii on the inshore spawning grounds and Agulhas bank off the South Coast of South Africa." Thesis, Rhodes University, 2002. http://hdl.handle.net/10962/d1005096.

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The chokka squid, Loligo vulgaris reynaudii, is a commercially important species supporting a large, high-value export fishery for South Africa. This study reviewed its population dynamics and reproductive biology. Biological information collected on biannual research cruises from September 1986 to April 1999 on the Agulhas Bank as well as information from commercial vessels operating in the inshore environment collected between April 1988 and July 1989 and again between June 1999 and May 2000 were analysed. Size ranges of juveniles, subadults and adults were calculated and used to determine s
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13

Luvison, Bertrand. "Détection non supervisée d'évènements rares dans un flot vidéo : application à la surveillance d'espaces publics." Phd thesis, Université Blaise Pascal - Clermont-Ferrand II, 2010. http://tel.archives-ouvertes.fr/tel-00626490.

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Cette thèse est une collaboration entre le LAboratoire des Sciences et Matériaux pour l'Électronique et d'Automatique (LASMEA) de Clermont-Ferrand et le Laboratoire Vision et Ingénierie des Contenus (LVIC) du CEA LIST à Saclay. La première moitié de la thèse a été accomplie au sein de l'équipe ComSee (1) du LASMEA et la deuxième au LVIC. L'objectif de ces travaux est de concevoir un système de vidéo-assistance temps réel pour la détection d'évènements dans des scènes possiblement denses.La vidéosurveillance intelligente de scènes denses telles que des foules est particulièrement difficile, pri
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14

Carneiro, Pedro Cavalcanti Fatorelli. "Ocorrência e distribuição espacial e temporal das larvas de anuros (Amphibia) em diferentes sistemas aquáticos da Ilha Grande (Rio de Janeiro)." Universidade do Estado do Rio de Janeiro, 2011. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=4135.

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Fundação de Amparo à Pesquisa do Estado do Rio de Janeiro<br>Os girinos dos anuros podem ocorrer em inúmeros tipos de sistemas hídricos, desde ambientes relativamente simples e previsíveis, como na água acumulada em epífitas ou uma poça temporária, até hábitats aquáticos permanentes mais complexos, como os riachos. A interação entre os fatores ambientais bióticos e abióticos existentes nesses diferentes ambientes com os fatores históricos é essencial para explicar a estrutura das comunidades dessa fase de vida dos anuros. O entendimento sobre como estes fatores atuam e sua importância nos cond
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15

Chaabna, Karima. "Spatio-temporal description of AIDS-related cancers incidence in north and sub-Saharan Africa and of mortality in HIV-infected patients in Algeria and hepatitis C prevalence in patients with non-Hodgkin lymphoma in Algeria." Thesis, Lyon 1, 2013. http://www.theses.fr/2013LYO10105.

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Background: In Africa, the prevalence of HIV/AIDS and hepatitis C virus (HCV) has been the highest in the world. Furthermore, cancer incidence is increasing. Objective: This thesis work presents a part of the impact of these infections on the cancer burden in northern and sub-Saharan Africa. AIDS-related cancers, namely Kaposi sarcoma (KS), non-Hodgkin lymphoma (NHL), and cervical cancer, were described to assess the impact of HIV/AIDS on cancer epidemiology in Algerian, Tunisian, Egyptian, Ugandan, and Zimbabwean populations. Furthermore, for the impact of HCV infection, the epidemiology of N
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16

Bourdis, Nicolas. "Détection de changements entre vidéos aériennes avec trajectoires arbitraires." Phd thesis, Telecom ParisTech, 2013. http://tel.archives-ouvertes.fr/tel-00834717.

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Les activités basées sur l'exploitation de données vidéo se sont développées de manière fulgurante ces dernières années. En effet, non seulement avons-nous assisté à une démocratisation de certaines de ces activités, telles que la vidéo-surveillance, mais également à une diversification importante des applications opérationnelles (e.g. suivi de ressources naturelles, reconnaissance aérienne et bientôt satellite). Cependant, le volume de données vidéo généré est aujourd'hui astronomique et l'efficacité des activités correspondantes est limitée par le coût et la durée nécessaire à l'interprétati
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17

DHIMAN, ASHISH. "HUMAN ACTION RECOGNITION BASED ON R-TRANSFORM AND SPATIAL TEMPORAL DESCRIPTOR." Thesis, 2014. http://dspace.dtu.ac.in:8080/jspui/handle/repository/15480.

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This thesis presents the framework of the combination of motion and shape information produced by different actions for human action recognition. The motion information obtained from the Radon Transform, computed on the Binary Silhouettes obtained from video sequence. Radon Transform of an image gives the projection of lines in all directions therefore it gives information about pixels variation inside the shape. We use the properties of Radon transform i.e. invariance to scaling and translational, to make noise free and robust model and rotational variance to distinguish the different a
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18

Lin, Shinn-Juh, and 林信助. "Open Spatio-Temporal Geographic Data Description Framework." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/63390990358469890454.

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碩士<br>國立成功大學<br>測量及空間資訊學系碩博士班<br>96<br>A successful application of geographical information system must be based on correct geographic data that can precisely simulate the real-world phenomenon. Two fundamental factors, time and location, must be considered while collecting geographic data. Since the geographical phenomena may change with time, the design of GIS data model must be able to appropriately model this dynamic nature, in order to accurately reflect the actual changes in reality and enhance the quality in later decision-making process. On the other hand, recent development of Intern
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19

Yang, Hsing-Lin, and 楊幸菱. "Daily Activity Recognition with Skeletal Descriptor subject to Spatio-Temporal Execution Variability." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/85151677804617372222.

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碩士<br>國立臺灣大學<br>電機工程學研究所<br>103<br>Human activity recognition has become one of the most important areas of research in computer vision. Without extra markers attached to human body, the interaction between machine and human can be natural in a vision-based recognition system. However, it still remains some challenges such as intra-class variability and inter-class similarity. In order to solve the problems, this thesis presents a novel skeleton-based activity recognition methodology with depth sensors. Due to the variation of execution styles and speed for different individuals, a Gaussian b
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20

Pai, Ming-Chi, and 白明奇. "Video Spatio-Temporal Characteristics Analysis and Description for Video Query by Examples." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/97678569920144074591.

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碩士<br>國立清華大學<br>電機工程學系<br>88<br>In this thesis, we will develop a video query by examples (QBE) operation for video database system based on the analysis and description of the spatio-temporal characteristics of the video sequences. Our system uses the characteristic of the video shot to retrieve similar shots in the database based on the video indices, and we processes the video shots to generate three hierarchical information: color, and motion, and object. First. We use Schunck method to estimate the motion field. Here, we analyze each frame to obtain the color level information, and one of
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