Exploració per autor "Torres Urgell, Lluís"Més informacióMés informació

Ara es mostren els items 32-51 de 61

    • Improvements on stochastic vector quantization of images 

      Torres Urgell, Lluís (. ICASSP, 1993)
      Text en actes de congrés
      Accés obert
      A novel nonadaptive fixed-rate vector quantizer encoding scheme is presented, and preliminary results are shown. The design of the codebook has been based on a stochastic approach in order to match a previously defined ...

    • INTRODUCCIO ALS SISTEMES AUDIOVISUALS (Examen 1r Quadr.) 

      Torres Urgell, Lluís (Universitat Politècnica de Catalunya, 2006-01-19)
      Examen
      Accés restringit a la comunitat UPC

    • INTRODUCCIO ALS SISTEMES AUDIOVISUALS (Examen 1r Quadr.) 

      Torres Urgell, Lluís (Universitat Politècnica de Catalunya, 2003-01-08)
      Examen
      Accés restringit a la comunitat UPC

    • INTRODUCCIO ALS SISTEMES AUDIOVISUALS (Examen 2n Quadr.) 

      Torres Urgell, Lluís (Universitat Politècnica de Catalunya, 2003-06-16)
      Examen
      Accés restringit a la comunitat UPC

    • INTRODUCCIO ALS SISTEMES AUDIOVISUALS (Examen 2n Quadr.) 

      Torres Urgell, Lluís (Universitat Politècnica de Catalunya, 2006-06-12)
      Examen
      Accés restringit a la comunitat UPC

    • Morphological filter for lossless image subsampling 

      Casas Pla, Josep Ramon; Torres Urgell, Lluís (IEEE Computer Society, 1994)
      Text en actes de congrés
      Accés obert
      We present a morphological filter for lossless image subsampling for a given downsampling-upsampling strategy. This filter is applied in a multiresolution decomposition and results in a more efficient scheme for image ...

    • Morphological interpolation for texture coding 

      Casas Pla, Josep Ramon; Salembier Clairon, Philippe Jean; Torres Urgell, Lluís (. S.N., 1995)
      Text en actes de congrés
      Accés obert
      In this paper a new morphological interpolation technique is presented. It is applied to the coding of the smooth (primary) component in a sketch-based image compression approach for very low bit-rates. The interpolation ...

    • New approaches to texture coding in segmentation and feature-based image coding schemes 

      Torres Urgell, Lluís; Casas Pla, Josep Ramon (. S.N., 1995)
      Text en actes de congrés
      Accés obert

    • New trends in image and video compression 

      Torres Urgell, Lluís (Eurasip, 2000)
      Text en actes de congrés
      Accés obert
      Image and video compression have been the object of intensive research in the last thirty years. The field is now mature as is proven by the large number of applications that make use of this technology. Digital Video ...

    • 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. ...

    • Prediction error image coding using a modified stochastic vector quantization scheme 

      Torres Urgell, Lluís; Casas Pla, Josep Ramon (IEEE, 1996)
      Text en actes de congrés
      Accés obert
      The objective of this paper is to provide an efficient and yet simple method to encode the prediction error image of video sequences, based on a stochastic vector quantization (SVQ) approach that has been modified to cope ...

    • Processament del senyal - Col.lecció de Problemes 

      Hernando Pericás, Francisco Javier; Lagunas Hernandez, Miguel A.; Marqués Acosta, Fernando; Mariño Acebal, José Bernardo; Monte Moreno, Enrique; Nadeu Camprubí, Climent; Oliveras Vergés, Albert; Rodríguez Fonollosa, Javier; Torres Urgell, Lluís; Vázquez Grau, Gregorio; Vidal Manzano, José (Universitat Politècnica de Catalunya, 2003)
      Problema, exercici
      Accés obert

    • Region-based video coding using mathematical morphology 

      Salembier Clairon, Philippe Jean; Torres Urgell, Lluís; Meyer, F; Gu, C (1995-06)
      Article
      Accés obert
      This paper presents a region-based coding algorithm for video sequences. The coding approach involves a time-recursive segmentation relying on the pixels homogeneity, a region-based motion estimation, and motion compensated ...

    • Residual image coding using mathematical morphology 

      Casas Pla, Josep Ramon; Torres Urgell, Lluís (1994)
      Text en actes de congrés
      Accés obert
      A new method for the extraction, selection and coding of perceptually significant image components in a video sequence is presented. It has been applied to the coding residues of a segmentation-based multilevel coding ...

    • Second generation video coding schemes and their role in mpeg-4 

      Torres Urgell, Lluís; Pereira Marques, Fernando; Kunt, Murat (UNIVERSITÉ CATHOLIQUE DE LOUVAIN, 1996)
      Text en actes de congrés
      Accés obert
      Since its introduction in 1985, there has been a lot of activity in the eld of second generation still image coding. In the last years, the approach has been extended to video coding and has been the basis for European ...

    • Segmentation based coding of textures using stochastic vector quantization 

      Torres Urgell, Lluís; Casas Pla, Josep Ramon; Diego, de S (1994)
      Text en actes de congrés
      Accés obert
      In second generation image compression techniques the image to be compressed is first segmented. The pixels are divided into mutually exclusive spatial regions based on some criteria. After segmentation, the image consists ...

    • Software con la implementación de los descriptores de vídeo seleccionados 

      Raventós, Arnau; Torres Urgell, Lluís; Tarrés Ruiz, Francisco (2011-10-30)
      Report de recerca
      Accés restringit per acord de confidencialitat
      Entregable E 3.1.2

    • Stochastic vector quantization of images 

      Torres Urgell, Lluís; Casas Pla, Josep Ramon; Arias, E (1997-11)
      Article
      Accés restringit per política de l'editorial
      One of the most important steps in the vector quantization of images is the design of the codebook. The codebook is generally designed using the LBG algorithm, that is in essence a clustering algorithm which uses a large ...

    • Strong edge features for image coding 

      Casas Pla, Josep Ramon; Torres Urgell, Lluís (P. MARAGOS, R.W. SCHAFER KLUWER ACADEMIA PUBLISHERS, 1996)
      Text en actes de congrés
      Accés obert
      A two-component model is proposed for perceptual image coding. For the first component of the model, the watershed operator is used to detect strong edge features. Then, an efficient morphological interpolation algorithm ...

    • Svq: a proposal for still image coding in mpeg 4 - snhc 

      Torres Urgell, Lluís; Gimeno, D; García Luque, David (European Commission. EU Publications, 1997)
      Text en actes de congrés
      Accés obert
      A technique for efficient coding of homogeneous textures is presented here. The technique is based on the use of Stochastic Vector Quantization and provides very high compression with graceful degradation. To encode the ...