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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Learning non-linear models of shape and motion

Bowden, Richard January 2000 (has links)
No description available.
2

Application du Modèle à Distribution de Points au corps humain pour la ré-identification de personnes / Alignment of a Point Distribution Model onto the human body for person re-identification

Huynh, Olivier 31 May 2016 (has links)
L'essor des systèmes mobiles pose de nouvelles problématiques dans le domaine de vision par ordinateur. Les techniques de ré-identification s'appuyant sur un réseau de caméras fixes doivent être repensées afin de s'adapter à un décor changeant. Pour répondre à ces besoins, cette thèse explore, dans le cadre du corps humain, l'utilisation d'un modèle structurel habituellement employé pour de la reconnaissance faciale. Il s'agit de l'alignement d'un modèle à distribution de points (Point Distribution Model ou PDM). L'objectif de ce pré-traitement avant la ré-identification est triple, segmenter la personne du décor, améliorer la robustesse vis-à-vis de sa pose et extraire des points clés spatiaux pour construire une signature basée sur son comportement.Nous concevons et évaluons un système complet de ré-identification, découpé en trois modules mis en séquence. Le premier de ces modules correspond à la détection de personnes. Nous proposons de nous baser sur une méthode de l'état de l'art utilisant les Channel Features avec l'algorithme AdaBoost.Le second module est l'alignement du PDM au sein de la boîte englobante fournie par la détection. Deux approches sont présentées dans cette thèse. La première s'appuie sur une formulation paramétrique du modèle de forme. L'alignement de ce modèle est guidé par la maximisation d'un score d'un modèle d'apparence GentleBoost utilisant des caractéristiques locales de type histogrammes de gradients orientés. La seconde approche exploite une technique de cascade de régressions de forme. L'idée principale est le regroupement de déformations homogènes en clusters et la classification de ces derniers dans le but d'aligner le PDM itérativement.Enfin, le troisième module est celui de la ré-identification. Nous montrons que l'utilisation d'un PDM en support permet d'améliorer les résultats de ré-identification. Nos expérimentations portent sur des signatures d'apparence classique, les histogrammes de couleurs, et sur un descripteur de forme, le Shape Context. L'évaluation de ce dernier fournit des résultats encourageants pour une perspective d'utilisation des PDM au sein d'une reconnaissance de démarches. / The emergence of mobile systems brings new problematics in computer vision. Static camera-based methods for re-identification need to be adapted in this new context. To deal with dynamical background, this thesis proposes to employ the well known Point Distribution Model (PDM), usually applied for face alignment, on the human body. Three advantages come from this pre-processing before re-identification, segment the person from background, enhance robustness to the person pose and extract spatial key points to build a behavioural-based signature.We implement and evaluate a complete framework for re-identification, divided in three sequential modules. The first one corresponds to the pedestrian detection. We use an efficient method of the state of the art employing the Channel Features with the algorithm AdaBoost.The second one is the PDM alignment within the bounding box provided by the detection step. Two distinct approaches are presented in this thesis. The first method relies on a parametric formulation to describe the shape, similar to the ASM or AAM. To fit this shape model, we maximize the score of an appearance model defined by GentleBoost, which employs local histograms of oriented gradients. The second approach is based on the cascade regression shape scheme. The main idea is the approximation for each step into a classification of homogeneous deformations, grouped by unsupervised clustering.The third module is the re-identfication one. We show that employing a PDM as a structural support improves re-identification results. We experiment classic appearance-based signatures, color histograms and the shape descriptor Shape Context. The results are encouraging for application perspective of PDM for the gait recognition.
3

Posouzení možnosti připojení větrného parku Drahany 45 MW do sítě 110 kV / Evaluation of possibilities for connection of wind farm Drahany 45 MW to 110 kV network

Gregr, Tomáš January 2012 (has links)
This Master's thesis is focused on connecting of new power sources into electrical network, particularly, the steady state and allowed voltage variation in network nodes, which occur in steady state before and after connection of a new power source into distribution network, with regard to valid legislation. The new power source in question is the new wind farm Drahany with active power of 45 MW, which should be connected into distribution network 110kV, operated by distribution company E.ON. The aim of this work is to find the most suitable connection point of a wind farm into distribution network, considering transmission capacity of individual electric lines and voltage variations in network nodes, as well as Drahany wind farm's investor's expenses on construction of a connection line to connection point and the distribution network's operator's expenses on modification of the connection point. Also, methods of calculating of electric networks in steady state are described in this paper, particularly, linear calculations, because these are needed for the calculations in E-vlivy program, in which the possible options of Drahany wind farm's connection into network 110 kV, in various places, were modeled. The description of the E-Vlivy program is also included in this paper. The E.ON company's materials form the basis for this Master's thesis, which will later serve as one of the documents needed for Drahany wind farm’s connection point evaluation into distribution network 110 kV.

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