Ponències/Comunicacions de congressos: Enviaments recents

Ara es mostren els items 13-24 de 82

    • 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 ...

    • 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 ...

    • 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 ...

    • An efficient technique of texture representation in segmentation-based image coding schemes 

      Torres Urgell, Lluís; Casas Pla, Josep Ramon; Campins, J (IEEE IEEE, 1995)
      Text en actes de congrés
      Accés obert
      In segmentation-based image coding techniques the image to be compressed is first segmented. Then, the information is coded describing the shape and the interior of the regions. A new method to encode the texture obtained ...

    • 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

    • A new approach to texture coding using stochastic vector quantization 

      Gimeno, D; Torres Urgell, Lluís; Casas Pla, Josep Ramon (IEEE Computer Society, 1994)
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      Accés obert
      A new method for texture coding which combines 2-D linear prediction and stochastic vector quantization is presented in this paper. To encode a texture, a linear predictor is computed first. Next, a codebook following the ...

    • 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 ...

    • 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 ...

    • 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 ...

    • Personal health data - privacy policy harmonization and global enforcement 

      Ruotsalainen, Pekka; Delgado Mercè, Jaime; Blobel, Bernd; Lacroix, Paulette; Kurihara, Yukio; Pharow, Peter; Stechova, Katerina; Sahama, Tony (IOS Press, 2016)
      Text en actes de congrés
      Accés obert
      This workshop is jointly organized by EFMI Working Groups Security, Safety and Ethics and Personal Portable Devices in cooperation with IMIA Working Group “Security in Health Information Systems”. In contemporary healthcare ...

    • A robust motion estimation and segmentation approach to represent moving images with layers 

      Torres Urgell, Lluís; García Luque, David; MATES, A (IEEE COMPUTER SOCIETY, 1997)
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      Accés obert
      The paper provides a robust representation of moving images based on layers. To that goal, we have designed efficient motion estimation and segmentation techniques by affine model fitting suitable for the construction of ...

    • 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 ...