Browsing by Contributor "Ortega, Antonio"
Now showing items 1-10 of 10
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A graph signal processing solution for defective directed graphs
(Universitat Politècnica de Catalunya, 2020-06-29)
Bachelor thesis
Open Access
Covenantee: USC Viterbi School of EngineeringThe main purpose of this thesis is to nd a method that allows to systematically adapt GSP techniques so they can be used on most non-diagonalizable graph operators. In Chapter 1 we begin by presenting the framework in ... -
Analysis of twitter traffic based on renewal densities
(Universitat Politècnica de Catalunya, 2012-04-12)
Master thesis (pre-Bologna period)
Open Access
Covenantee: University of Southern California[ANGLÈS] We propose a novel approach for Twitter traffic analysis based on renewal theory. Even though Twitter datasets are of increasing interest to researchers, extracting information from message timing remains somewhat ... -
Contributions to Distributed Spatial Compression in Wireless Sensor Networks
(Universitat Politècnica de Catalunya, 2010-07)
Master thesis (pre-Bologna period)
Open Access
Covenantee: University of Southern CaliforniaThis thesis presents several contributions in the field of distributed spatial compression inWireless Sensor Networks. First, since in most of the spatial compression schemes some nodes (raw nodes) need to broadcast their ... -
Distributed graph signal processing
(Universitat Politècnica de Catalunya / University of Southern California, 2013-12-13)
Bachelor thesis
Open Access
Covenantee: University of Southern California[ANGLÈS] Graph representation of data is a current trend in research nowadays, especially for those problems dealing with huge amounts of information that need to be analyzed and studied. Many fields can benefit from the ... -
Edge-preserving depth-map coding using graph-based wavelets
(Universitat Politècnica de Catalunya, 2010-06)
Master thesis (pre-Bologna period)
Open AccessThis thesis presents a new wavelet transform speci cally designed for the coding of depth images which are used in view synthesis operations. Two basic properties of these images can be leveraged: rst, errors in pixels ... -
Improved neural network generalization using channel-wise NNK graph constructions
(Universitat Politècnica de Catalunya, 2021-06)
Bachelor thesis
Open Access
Covenantee: USC Viterbi School of EngineeringState-of-the-art neural network architectures continue to scale in size and deliver impressive results on unseen data points at the expense of poor interpretability. In the deep layers of these models we often encounter ... -
Privacy preserving photo sharing analysis and derived compression technique for images
(Universitat Politècnica de Catalunya / University of Southern California, 2013-12-19)
Master thesis (pre-Bologna period)
Open Access
Covenantee: University of Southern California[ANGLÈS] The initial idea for my thesis was to analyse the algorithm to: find possible ways to attack the privacy component, figure out ways to apply filtering to the privacy enabled images or reduce the overall size of ... -
Protecting JPEG images using variable threshold splitting
(Universitat Politècnica de Catalunya, 2016-05-23)
Bachelor thesis
Open Access
Covenantee: University of Southern CaliforniaThis thesis describes an improvement of an existing algorithm for privacy preserving in image sharing (P3-Privacy Preserving Photo Sharing). In short, the existing algorithm uses a fixed threshold whereas in this thesis a ... -
Spatio-temporal graph-based interpolation for mobile sensing networks
(Universitat Politècnica de Catalunya, 2022-05)
Bachelor thesis
Open Access
Covenantee: University of Southern CaliforniaLes xarxes de sensors mòbils estan atraient molt interès a la comunitat investigadora, ja que permeten explotar la mobilitat i cobreixen àrees més grans que les xarxes de sensors fixes. Aquesta tesi aborda les principals ... -
Study of manifold geometry using non-negative kernel graphs
(Universitat Politècnica de Catalunya, 2022-10-21)
Bachelor thesis
Open AccessAmb l'augment de la mida de les dades, els sistemes efectius de reducció de la dimensionalitat s'han tornat necessaris per una gran varietat de tasques. Un conjunt de dades es pot caracteritzar per les seves propietats ...