Exploració per autor "Gasull Llampallas, Antoni"Més informacióMés informació

Ara es mostren els items 35-54 de 72

    • Filtrado transversal adaptativo de varianza constante para la ecualización de canal 

      Vázquez Grau, Gregorio; Gasull Llampallas, Antoni; Sánchez Umbría, Juan; Oliveras Vergés, Albert (1989)
      Text en actes de congrés
      Accés obert
      This paper describes the problem of lineal filtering of noisy data under a Maximum Likelihood objective. In this sense, the paper shows that a weighted square error cost function deals and it is necessary to weight the ...

    • Image restoracion using the w-slice method 

      Sayrol Clols, Elisa; Chrysostomos, Nikias; Gasull Llampallas, Antoni (1995-08)
      Article
      Accés obert
      We propose the use of higher order statistics (HOS)-based methods to address the problem of image restoration. The restoration strategy is based on the fact that the phase information of the original image and its HOS are ...

    • Image restoration using HOS and the Radon transform 

      Sayrol Clols, Elisa; Nikias, C L; Gasull Llampallas, Antoni (IEEE IEEE PRESS, 1993)
      Text en actes de congrés
      Accés obert
      The authors propose the use of higher-order statistics (HOS) to study the problem of image restoration. They consider images degraded by linear or zero phase blurring point spread functions (PSF) and additive Gaussian ...

    • Image restoration using HOS and the Radon transform 

      Sayrol Clols, Elisa; Chrysostomos, Nikias; Gasull Llampallas, Antoni (. IEEE, 1993)
      Text en actes de congrés
      Accés obert
      The authors propose the use of higher-order statistics (HOS) to study the problem of image restoration. They consider images degraded by linear or zero phase blurring point spread functions (PSF) and additive Gaussian ...

    • Improved ML cross-spectral estimation 

      Lagunas Hernandez, Miguel A.; Gasull Llampallas, Antoni (1986)
      Text en actes de congrés
      Accés obert
      This work deals with the use of dedicated filters for cross-spectrum estimation. Basically, the ML cross-spectral estimator can be obtained as the natural extension of the Normalized Maximurn Likelihood procedure, reported ...

    • Interpolation and extrapolation of image partitions using Fourier descriptors: application to segmentation-based coding schemes 

      Marqués Acosta, Fernando; Llorens, Bernat; Gasull Llampallas, Antoni (. S.N., 1995)
      Text en actes de congrés
      Accés obert
      This paper presents an interpolation/extrapolation technique for sequence partitions. It consists of four steps: region parametrization, region interpolation, region ordering and partition creation. The evolution of each ...

    • Known Input Power Spectrum in Adaptive L.M.S. and A. G. Algorithms 

      Vázquez Grau, Gregorio; Gasull Llampallas, Antoni; Lagunas Hernandez, Miguel A. (1986)
      Text en actes de congrés
      Accés obert
      This work deals with the use of previous or colateral information to improve the behaviour of adaptive algorithms. The study is made on gradient-baseq methods due te the relatively simple and good performances that they ...

    • Known input power spectrum in adaptive L.M.S. and A.G. algorithms 

      Vázquez Grau, Gregorio; Gasull Llampallas, Antoni; Lagunas Hernandez, Miguel A. (1986)
      Text en actes de congrés
      Accés obert
      This work deals with the use of previous or colateral information to improve the behaviour of adaptive algorithms. The study is made on gradient-baseq methods due te the relatively simple and good performances that they ...

    • LAVICAD: LAboratori VIrtual de Comunicacions Analògiques i Digitals 

      Cabrera-Bean, Margarita; Giró Nieto, Xavier; Rey Micolau, Francesc; Gasull Llampallas, Antoni; Casas, Josep; Villares Piera, Nemesio Javier; Fernández Rubio, Juan Antonio; Sala Álvarez, José; Espinosa Fricke, Pedro; Fernández, Carlos Marcos; Cortes, Silvia; Muntanyola, Mireia; Farré, Miquel Angel (2009-02-12T09:27:53Z)
      Comunicació de congrés / Text en actes de congrés
      Accés obert
      Mitjançant el present ajut s’ha ampliat l’aplicació en xarxa LAVICAD (LAboratori VIrtual de COmunicacions Analògiques i Digitals) que s’ofereix de forma integrada dins de la plataforma d’e-learning COM@WEB. LAVICAD és ...

    • LaViCAD: Laboratorio Virtual de Comunicaciones Analógicas y Digitales 

      Cabrera-Bean, Margarita; Fernández Prades, Carles; Vargas Berzosa, Carlos; Vargas Berzosa, Francisco; Fernández Rubio, Juan Antonio; Gasull Llampallas, Antoni (Universitat de Barcelona. Edicions i Publicacions, 2006)
      Text en actes de congrés
      Accés obert
      En este trabajo se presenta tanto el diseño como la experimentación de un Laboratorio Virtual de Comunicaciones Analógicas y Digitales: LaViCAD. Mediante LaViCAD se pueden experimentar y verificar diferentes aplicaciones ...

    • Matehematic morphology approach for renal biopsy analysis 

      Marqués Acosta, Fernando; Cuberas, Gemma; Gasull Llampallas, Antoni; Seron, Daniel; Moreso, Francesc; Joshi, Nayana (Institute of Electrical and Electronics Engineers (IEEE), 2004)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      This paper proposes a new technique for the analysis of renal biopsies stained with Sirius red and digitized under non-polarized light. The renal interstitial space, the cortex area and the tubules should be segmented to ...

    • Materials transversals per a l'aprenentatge actiu de les matèries de processat d'imatge i vídeo 

      Morros Rubió, Josep Ramon; Vilaplana Besler, Verónica; Ruiz Hidalgo, Javier; Casas Pla, Josep Ramon; Gasull Llampallas, Antoni; Marqués Acosta, Fernando; Pardàs Feliu, Montse; Salembier Clairon, Philippe Jean (2014)
      Text en actes de congrés
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      Aquest treball vol promoure la col·laboració i coordinació entre assignatures de processat d'imatge/vídeo amb l’objectiu de potenciar els resultats en l'aprenentatge. Les principals contribucions son a) la creació d’un ...

    • Measuring true spectral density from ML filters (NMLM and q-NMLM spectral estimates) 

      Lagunas Hernandez, Miguel A.; Gasull Llampallas, Antoni (Institute of Electrical and Electronics Engineers (IEEE), 1984)
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      Accés obert
      Starting from the classical procedure reported by Capon for power level estimation from ML filters, the authors present how this method can be modifyed in order to obtain a power spectral density estimate. The basic idea ...

    • Més enllà d’Atenea: un món per descobrir 

      Vallverdú Bayés, Sisco; Gasull Llampallas, Antoni (Universitat Politècnica de Catalunya. Institut de Ciències de l'Educació, 2010-06-04)
      Comunicació de congrés
      Accés obert
      La organització de l'activitat docent de l'assignatura Senyals i Sistemes, amb 4 hores de teoria a la setmana i 1 de laboratori, es fonamenta, d'una banda, en una proposta formal recollida a Atenea, i de l'altre en la ...

    • Método MLNq para arrays de alta resolución 

      Gasull Llampallas, Antoni; Lagunas Hernandez, Miguel A.; Fernández Rubio, Juan Antonio; Moreno Bilbao, M. Asunción (Universidad de Sevilla, 1984)
      Text en actes de congrés
      Accés obert
      Spectral analysis techniques are used to bearing estimation problem. Each one of this gives a different array beamforming. We show here a generalized normalized Maximum Likehood Method which present a high resolution ...

    • Morphological detection based on size and contrast criteria. Application to cells detection 

      Salembier Clairon, Philippe Jean; Gasull Llampallas, Antoni; Marqués Acosta, Fernando; Sayrol Clols, Elisa (. IEEE, 1992)
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      This paper deals with a detection algorithm relying on size and contrast criteria. It is suitable for a large range of applications where a priori information about the size and the contrast of the objects to detect is ...

    • Motion estimation using higher-order statistics 

      Sayrol Clols, Elisa; Gasull Llampallas, Antoni; Rodríguez Fonollosa, Javier (1996-06)
      Article
      Accés obert
      The objective of this paper is to introduce a fourth-order cost function of the displaced frame difference (DFD) capable of estimating motion even for small regions or blocks. Using higher than second-order statistics is ...

    • Motion estimation using higher-order statistics 

      Sayrol Clols, Elisa; Gasull Llampallas, Antoni; Rodríguez Fonollosa, Javier (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1996-06-30)
      Article
      Accés obert
      The objective of this paper is to introduce a fourth-order cost function of the displaced frame difference (DFD) capable of estimating motion even for small regions or blocks. Using higher than second-order statistics ...

    • Object detection and segmentation on a hierarchical region-based image representation 

      Vilaplana Besler, Verónica; Marqués Acosta, Fernando; León Cristóbal, Míriam; Gasull Llampallas, Antoni (2010)
      Comunicació de congrés
      Accés obert
      In this paper we present a general framework for object detection and segmentation. Using a bottom-up unsupervised merging algorithm, a region-based hierarchy that represents the image at different resolution levels is ...

    • Obtencion de un esqueleto morfologico sin puntos redundantes 

      Marqués Acosta, Fernando; Gasull Llampallas, Antoni; Torres Urgell, Lluís (1991)
      Text en actes de congrés
      Accés obert
      Skeleton is a powerful method to describe binary images. Although there are different possibilities to define a skeleton, is very common to use morphological skeleton because it is easy and fast for implementation purposes. ...