Enviaments recents

  • Object-based image coding 

    Pardàs Feliu, Montse (1997-03)
    Article
    Accés restringit per política de l'editorial
    Object-based compression methods describe images in terms of a set of regions (a partition), and of some information for each region to be used by the receiver to reconstruct the image (its texture). Different techniques ...
  • Segmentation of video sequences for partition tree generation 

    Pardàs Feliu, Montse; Salembier Clairon, Philippe Jean (1997-07)
    Article
    Accés restringit per política de l'editorial
    In this paper we propose a segmentation structure to generate a partition tree with multiple partition proposals. These multiple partitions are obtained for every image in a hierarchical way, from the coarsest one to the ...
  • Morphological tools for segmentation: connected operators and watersheds 

    Meyer, F; Oliveras Vergés, Albert; Salembier Clairon, Philippe Jean; Vachier, C (1997-08)
    Article
    Accés restringit per política de l'editorial
    The paper makes a survey of the morphological tools which are useful for image simplification and segmentation. It starts presenting the connected filters, which have the unique feature to simplify the images without ...
  • General requirements for coding oriented segmentation of video-sequences 

    Marqués Acosta, Fernando; Pardàs Feliu, Montse; Salembier Clairon, Philippe Jean; Meyer, F (1997-08)
    Article
    Accés restringit per política de l'editorial
    This paper deals with the basic requirements that should be fulfilledby a technique for segmenting video sequences in coding applications. The specific problems of coding-oriented video segmentation are analyzed. This way ...
  • 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 ...
  • 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 ...
  • Morphological operators for image and video compression 

    Salembier Clairon, Philippe Jean; Brigger, P; Casas Pla, Josep Ramon; Pardàs Feliu, Montse (1996-06)
    Article
    Accés obert
    This paper deals with the use of some morphological tools for image and video coding. Mathematical morphology can be considered as a shape-oriented approach to signal processing, and some of its features make it very useful ...
  • Flat zones filtering, connected operators, and filters by reconstruction 

    Salembier Clairon, Philippe Jean; Serra i Aguadé, Josep (1995-08)
    Article
    Accés obert
    This correspondence deals with the notion of connected operators. Starting from the definition for operator acting on sets, it is shown how to extend it to operators acting on function. Typically, a connected operator ...
  • 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 ...

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