DMAG - Grup d'Aplicacions Multimèdia Distribuïdes: Enviaments recents

Ara es mostren els items 25-36 de 123

    • 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)
      Text en actes de congrés
      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 ...

    • Privacy provision in eHealth using external services 

      Delgado Mercè, Jaime; Llorente Viejo, Silvia (IOS Press, 2015)
      Text en actes de congrés
      Accés obert
      Privacy provision is a key issue for successful secure access to patients’ health information. Current approaches do not always provide patients with the ability to define suitable rules to access to their information in ...

    • Un modelo para diseñar actividades de aprendizaje en la enseñanza de ingenierías 

      Otero Calviño, Beatriz; Rodríguez Luna, Eva (Red Estatal de Docencia Universitaria, 2016-11-01)
      Article
      Accés obert
      En los actuales momentos nuestros estudiantes se encuentran bastante desmotivados a la hora de asistir a clase y de trabajar. Esto conduce a que sea necesario que el profesor introduzca cambios en sus clases que lo lleven ...

    • Criterios para practicas de evaluación de calidad 

      Cadenato, Ana; Martínez Martínez, María del Rosario; Gallego Fernández, María Isabel; Amante García, Beatriz; Jordana Barnils, José; Farrerons Vidal, Óscar; Isalgué Buxeda, Antonio; Fabregat Fillet, Jaume (2012-07-31)
      Article
      Accés obert
      El grupo de innovación GRAPA ( GRupo de la Evaluación de la Práctica Académica ) d el proyecto RIMA de la Universitat Politècnica de Catalunya ha elaborado una serie de criterios , en forma de rúbrica, como buenas prácticas ...

    • Efficient coding of homogeneous textures using stochastic vector quantization and linear prediction 

      Gimeno, D; Torres Urgell, Lluís (1999-06)
      Article
      Accés obert
      Vector quantisation (VQ) has been extensively used as an effective image coding technique. One of the most important steps in the whole process is the design of the codebook. The codebook is generally designed using the ...

    • Analysis and synthesis of textures through the inference of Boolean functions 

      Domínguez Pumar, Manuel; Torres Urgell, Lluís (1997-05)
      Article
      Accés restringit per política de l'editorial
      This work deals with Boolean functions of non-linear and linear basis. The Boolean random functions of non-linear basis were proposed by Serra (1988,1989). These functions are generated through a Poisson point process upon ...

    • A region-based subband coding scheme 

      Casas Pla, Josep Ramon; Torres Urgell, Lluís (1997-07)
      Article
      Accés restringit per política de l'editorial
      This paper describes a region-based subband coding scheme intended for efficient representation of the visual information contained in image regions of arbitrary shape. QMF filters are separately applied inside each region ...

    • 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 ...

    • 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 ...