Now showing items 1-20 of 21

  • A comparative study between Elliptic Fourier and B-spline descriptors for object contour representation 

    Ferrer Arnau, Luis Jorge; Parisi Baradad, Vicenç; Soria Pérez, José Antonio; Nasreddine, Kamal; Benzinou, Abdesslam (2014)
    Conference report
    Restricted access - publisher's policy
    In this work, a comparative study between Elliptic Fourier and B-spline descriptors is carried out for comparing their efficiency in characterizing the contour shape of image objects. In both cases, the goal is to obtain ...
  • A new otolith image contour descriptor based on partial reflection 

    Reig Bolano, Ramon; Marti Puig, Pere; Lombarte, A.; Soria Pérez, José Antonio; Parisi Baradad, Vicenç (2010-12)
    Article
    Restricted access - publisher's policy
    In this paper we propose a new contour descriptor for reconstructing fish otolith contours that uses half the number of coefficients needed by the classical elliptical Fourier descriptors (EFDs) for the same accuracy. ...
  • An introduction to fault diagnosis of permanent magnet synchronous machines in master's degree courses 

    Riba Ruiz, Jordi-Roger; García Espinosa, Antonio; Romeral Martínez, José Luis; Ortega Redondo, Juan Antonio (John Wiley & Sons, 2010-08-16)
    Article
    Restricted access - publisher's policy
    Early fault detection and diagnosis of high-performance electric motors has been an active area of research for the past two decades. This work presents a practical session that facilitates instructing students in this ...
  • A simple spectrum estimation technique based on the analytic cepstrum 

    Nadeu Camprubí, Climent (1990)
    Conference report
    Open Access
  • Caracterización de señales de vibración no estacionarias en el dominio conjunto tiempo-frecuencia 

    Flórez Serrano, Elkin Gregorio; Cardona Foix, Salvador; Jordi Nebot, Lluïsa (2011)
    Conference report
    Restricted access - publisher's policy
    El monitoreo de las condiciones de vibración es comúnmente utilizado para incrementar la disponibilidad de las maquinas en general, reduciendo consecuentemente los daños o fallas en las mismas, incrementar su vida útil, ...
  • Detecció del xiulet per la generació de resums en vídeos esportius 

    Sicília Sansi, Sergi (Universitat Politècnica de Catalunya, 2013-02-19)
    Bachelor thesis
    Open Access
    El present document exposa el desenvolupament de l'aplicació del mètode d'Anàlisi de Components Principals per detectar el xiulet de l'àrbitre en el context de l'extracció automàtica d'esdeveniments d'interès en ...
  • Implementation of the parametric representation of the Fourier transform in fabrics 

    Cardenas, L. J.; Cifuentes, L.E; Torres, Y.; Millán Garcia-Varela, M. Sagrario (2007-06)
    Article
    Open Access
  • Just in time calculations for partially coherent imaging 

    Pérez Aviñoa, Marcos (Universitat Politècnica de Catalunya, 2019-07-23)
    Master thesis
    12 months embargo
    Algorithms to calculate partially coherent image formation are centered around the classic formula developed by Hopkins. Algebraic methods have been developed to make feasible the integration process, although with strong ...
  • Melt fracturing and healing: a mechanism for rhyolite magma degassing and origin of obsidian 

    Cabrera, Agustín; Weinberg, Roberto F.; Wright, Heather M. N.; Zlotnik, Sergio; Cas, Ray A.F. (2011)
    Article
    Open Access
    We present water content transects across a healed fault in pyroclastic obsidian from Lami pumice cone, Lipari, Italy, using synchrotron Fourier transform infrared spectroscopy. Results indicate that rhyolite melt degassed ...
  • Multi mode fiber imaging for endoscopy applications 

    Maestre Morote, Marcos (Universitat Politècnica de Catalunya, 2019-07)
    Master thesis
    Restricted access - confidentiality agreement
  • Non-relativistic Bondi-Metzner-Sachs algebra 

    Batlle Arnau, Carles; Delmastro, Diego; Gomis Torné, Joaquin (2017-09-21)
    Article
    Open Access
    We construct two possible candidates for non-relativistic bms(4) algebra in four space-time dimensions by contracting the original relativistic bms(4) algebra. bms(4) algebra is infinite-dimensional and it contains the ...
  • Novel characterization method of impedance cardiography signals using time-frequency distributions 

    Escrivá Muñoz, Jesús; Pan, Y.; Ge, S.; Jensen, Erik Weber; Vallverdú Ferrer, Montserrat (Springer, 2018-10)
    Article
    Open Access
    The purpose of this document is to describe a methodology to select the most adequate time-frequency distribution (TFD) kernel for the characterization of impedance cardiography signals (ICG). The predominant ICG beat was ...
  • Otolith shape classification for fish stock discrimination 

    Soria Pérez, José Antonio; Nasreddine, Kamal; Parisi Baradad, Vicenç; Ferrer Arnau, Luis Jorge; Benzinou, Abdesslam (2014)
    Conference report
    Restricted access - publisher's policy
    The shape analysis of otoliths, which are calcified structures in the inner ear of teleostean fishes, is known to be particularly relevant to address species identification and stock discrimination. Generally, scientists ...
  • Parametrización en envolvente y fase en sistemas de codificación 

    Moreno Bilbao, M. Asunción; Lagunas Hernandez, Miguel A.; Vallverdú Bayés, Sisco (Fundación Universidad-Empresa, 1986)
    Conference report
    Open Access
    En estos últimos años, se han dedicado muchos esfuerzos al estudio de funciones asociadas como el módulo y la fase de la Transformada de Fourier para reducción de ancho de banda. En este trabajo se estudia la importancia ...
  • Prediction of image partitions using Fourier descriptors: application to segmentation-based coding schemes 

    Marqués Truyol, Francisco; Gasull Llampallas, Antoni (1998-04)
    Article
    Open Access
    This paper presents a prediction technique for partition sequences. It uses a region-by-region approach that consists of four steps: region parameterization, region prediction, region ordering, and partition creation. The ...
  • Shannon wavelets in computational finance 

    Satorres Almenara, Àngel (Universitat Politècnica de Catalunya, 2017-07)
    Master thesis
    Open Access
    Derivative securities, when used correctly, allow investors to increase their expected profits and minimize their exposure to risk. Options offer leverage and insurance for risk-averse investors while they can be used as ...
  • Split step fourier method implemented in s-function 

    Monzó Cadena, Constantí (Cork Institute of Technology, 2006)
    Master thesis (pre-Bologna period)
    Restricted access - author's decision
  • Static and dynamic amplitude modulation of light in a twisted nematic liquid crystal display 

    Vilardy Ortiz, Juan Manuel; Millán Garcia-Varela, M. Sagrario; Pérez Cabré, Elisabet (International Society for Photo-Optical Instrumentation Engineers (SPIE), 2013)
    Conference lecture
    Restricted access - publisher's policy
    A SLM has been experimentally characterized in terms of amplitude modulation versus the gray level distribution (input signal) electronically addressed to the pixelated display in two conditions: input constant with time, ...
  • The Hilbert transform: introduction and applications 

    Lo Buglio, Dario (Universitat Politècnica de Catalunya, 2017-01)
    Master thesis
    Open Access
    The Hilbert transform is introduced from the mathematical point of view with the purpose in mind to use its properties in signal analysis applications. An important relation with the Fourier transform will be introducted ...
  • Transformada de Fourier: aplicaciones al procesamiento del señales 

    María Rodríguez, Carlos (Universitat Politècnica de Catalunya, 2017-01)
    Bachelor thesis
    Open Access
    El trabajo consiste en una sección teórica y una práctica, con el objetivo de introducirnos al análisis de Fourier. En la primera de estas presentamos las definiciones y resultados más relevantes sobre Series de Fourier y ...