Exploració per tema "Entropia (Teoria de la informació)"
Ara es mostren els items 1-18 de 18
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A pragmatic uncertainty measure based on rate-distorion theory and the uncertainty of BOE's
(Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 1996)
Article
Accés obertWe 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
(2014-07)
Article
Accés restringit per política de l'editorialAs 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
(2023-01-12)
Article
Accés obertKernel 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
(Universitat Politècnica de Catalunya, 2014-06-19)
Projecte Final de Màster Oficial
Accés obertEl 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
(2002)
Text en actes de congrés
Accés restringit per política de l'editorialWe 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
(2003)
Text en actes de congrés
Accés restringit per política de l'editorialAutomatic 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
(2005-01)
Article
Accés obertHere, 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
(Institute of Electrical and Electronics Engineers (IEEE), 2019)
Comunicació de congrés
Accés obertA 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
(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
(RAM - Verlag, 2016-12-01)
Capítol de llibre
Accés restringit per política de l'editorialEntropy 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
(2002)
Text en actes de congrés
Accés obertWe 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
(2014-05-01)
Article
Accés obertThe 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
(Institute of Electrical and Electronics Engineers (IEEE), 2023-10-12)
Article
Accés obertIt 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
(Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 2001)
Article
Accés obertIn 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
(2008-12-01)
Report de recerca
Accés obertThe 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
(Institute of Electrical and Electronics Engineers (IEEE), 2018)
Comunicació de congrés
Accés obertA 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
(2001)
Text en actes de congrés
Accés restringit per política de l'editorialComputation 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
(Universitat Politècnica de Catalunya, 2012-06-18)
Projecte/Treball Final de Carrera
Accés restringit per acord de confidencialitat