Ara es mostren els items 1-18 de 18

    • A pragmatic uncertainty measure based on rate-distorion theory and the uncertainty of BOE's 

      Fioretto, Anna; Sgarro, Andrea (Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 1996)
      Article
      Accés obert
      We discuss pragmatic information measures (hypergraph entropy and fractional entropy) inspired by source-coding theory (rate-distortion theory). We re-phrase the problem in the language of evidence theory, by expressing ...
    • A rate-splitting approach to fading channels with imperfect channel-state information 

      Pastore, Adriano; Koch, Tobias; Rodríguez Fonollosa, Javier (2014-07)
      Article
      Accés restringit per política de l'editorial
      As shown by Médard, the capacity of fading channels with imperfect channel-state information can be lower-bounded by assuming a Gaussian channel input X with power P and by upper-bounding the conditional entropy h(X|Y,H) ...
    • Analysis of kernel matrices via the von Neumann entropy and its relation to RVM performances 

      Belanche Muñoz, Luis Antonio; Wiejacha, Malgorzata (2023-01-12)
      Article
      Accés obert
      Kernel methods have played a major role in the last two decades in the modeling and visualization of complex problems in data science. The choice of kernel function remains an open research area and the reasons why some ...
    • Análisis de la sostenibilidad urbana mediante entropía de la información. Aplicación en los Distritos de Ciutat Vella, L'Eixample, Les Corts y Gracia 

      Salazar Llano, Lorena (Universitat Politècnica de Catalunya, 2014-06-19)
      Projecte Final de Màster Oficial
      Accés obert
      El ecosistema urbano se puede modelar como un sistema disipativo de carácter complejo, cuyo pronóstico está regido por una cierta incertidumbre. Haciendo una aproximación al concepto de ciudad desde la estadística es posible ...
    • Applications of information theory to computer graphics 

      Sbert Cassasayas, Mateu; Feixas, Miquel; Rigau, Jaume; Castro, Francesc; Vázquez Alcocer, Pere Pau (2002)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      We present in this talk several applications of Information Theory concepts to Computer Graphics. Mutual information will be applied to Radiosity to obtain the better scene discretization. The concept of entropy will be ...
    • Automatic indoor scene exploration 

      Vázquez Alcocer, Pere Pau; Sbert Cassasayas, Mateu (2003)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Automatic computation of best views of objects are very useful. For example, they can be used as the starting point of a scene exploration, or to enrich galleries of objects available through Internet by adding an image a ...
    • Decoding least effort and scaling in signal frequency distributions 

      Ferrer Cancho, Ramon (2005-01)
      Article
      Accés obert
      Here, assuming a general communication model where objects map to signals, a power function for the distribution of signal frequencies is derived. The model relies on the satisfaction of the receiver (hearer) communicative ...
    • Entropy-based non-data-aided SNR estimation 

      Cabrera Estanyol, Ferran de; Riba Sagarra, Jaume (Institute of Electrical and Electronics Engineers (IEEE), 2019)
      Comunicació de congrés
      Accés obert
      A non-data-aided SNR estimation of a communication channel is addressed in this paper. The main contribution relies on the relationship between an entropy measure of a given constellation and the link quality. The main ...
    • Evolució de l'entropia en el llenguatge infantil 

      Castela Ibañez, Susana (Universitat Politècnica de Catalunya, 2014-02-07)
      Treball Final de Grau
      Accés obert
      [CATALÀ] En aquest projecte s'intenta esbrinar si l'entropia de bloc permet descriure el desenvolupament de la parla dels infants. Per a fer-ho, s'ha desenvolupat programari adient per estudiar l'entropia de bloc en tot ...
    • Fast calculation of entropy with Zhang's estimator 

      Lozano Boixadors, Antoni; Casas Fernández, Bernardino; Bentz, Chris; Ferrer Cancho, Ramon (RAM - Verlag, 2016-12-01)
      Capítol de llibre
      Accés restringit per política de l'editorial
      Entropy is a fundamental property of a repertoire. Here, we present an efficient algorithm to estimate the entropy of types with the help of Zhang’s estimator. The algorithm takes advantage of the fact that the number of ...
    • Image-based modeling using viewpoint entropy 

      Vázquez Alcocer, Pere Pau; Feixas, Miquel; Sbert Cassasayas, Mateu; Heidrich, Wolfgang (2002)
      Text en actes de congrés
      Accés obert
      We present a new method to automatically determine the correct camera placement positions in order to obtain a minimal set of views for Image-Based Rendering. The viewpoints should cover all visible polygons with an adequate ...
    • Measuring instantaneous and spectral information entropies by shannon entropy of choi-williams distribution in the context of electroencephalography 

      Melia, Umberto Sergio Pio; Clarià Sancho, Francesc; Vallverdú Ferrer, Montserrat; Caminal Magrans, Pere (2014-05-01)
      Article
      Accés obert
      The theory of Shannon entropy was applied to the Choi-Williams time-frequency distribution (CWD) of time series in order to extract entropy information in both time and frequency domains. In this way, four novel indexes ...
    • Minimum error entropy estimation under contaminated Gaussian noise 

      López Molina, Carlos Alejandro; Cabrera Estanyol, Ferran de; Riba Sagarra, Jaume (Institute of Electrical and Electronics Engineers (IEEE), 2023-10-12)
      Article
      Accés obert
      It is shown that Rényi's entropy of a Gaussian mixture with entropic index α∈(1,∞] is upper-bounded by the cluster with minimum variance. This basic idea leads to a clean worst-case formulation of the minimum error entropy ...
    • On dispersion measures 

      Martín Pelayo, Javier; Mayor Forteza, Gaspar; Suñer Llabrés, Jaume (Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 2001)
      Article
      Accés obert
      In this paper a new framework for the study of measures of dispersion for a class of $n$-dimensional lists is proposed. The concept of monotonicity with respect to a "sharpened"-type order is introduced. This type of ...
    • On the maximum entropy and the problem of moments: an application to stellar kinematics 

      Cubarsí Morera, Rafael (2008-12-01)
      Report de recerca
      Accés obert
      The maximum entropy approach is used to solve the classical moment problem of stellar kinematics. If an extended set of moments is available, the current method provides a linear estimation algorithm, which is given ...
    • Robust estimation of the magnitude squared coherence based on Kernel signal processing 

      Cabrera Estanyol, Ferran de; Riba Sagarra, Jaume; Vázquez Grau, Gregorio (Institute of Electrical and Electronics Engineers (IEEE), 2018)
      Comunicació de congrés
      Accés obert
      A new outlier-robust approach to estimate the magnitude squared coherence of a random vector sequence, a common task required in a variety of estimation and detection problems, is proposed. The proposed estimator is based ...
    • Viewpoint selection using viewpoint entropy 

      Vázquez Alcocer, Pere Pau; Feixas, Miquel; Sbert Cassasayas, Mateu; Heidrich, Wolfgang (2001)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Computation of good viewpoints is important in several fields: computational geometry, visual servoing, robot motion, graph drawing, etc. In addition, selection of good views is rapidly becoming a key issue in computer ...
    • Web content classification in a massively parallel platform 

      Mutsuda Zapater, Masumi (Universitat Politècnica de Catalunya, 2012-06-18)
      Projecte/Treball Final de Carrera
      Accés restringit per acord de confidencialitat