Now showing items 1-20 of 22

    • 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. ...
    • A simple spectrum estimation technique based on the analytic cepstrum 

      Nadeu Camprubí, Climent (1990)
      Conference report
      Open Access
    • 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 ...
    • Análisis de espectrogramas de señales musicales con operadores morfológicos 

      Bustos Manzanet, Laura (Universitat Politècnica de Catalunya, 2020-01)
      Bachelor thesis
      Open Access
      The way an instrument is learned to be played has changed a lot since the rise of the internet, specially the show up of YouTube. High amounts of people learn to play instruments such as the guitar from watching videos and ...
    • 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 (2006)
      Master thesis (pre-Bologna period)
      Restricted access - author's decision
      Covenantee:   Cork Institute of Technology
    • 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 ...