Enviaments recents

  • 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 ...
  • A simple and efficient face detection algorithm for video database applications 

    Albiol, A; Torres Urgell, Lluís; Delp, E; Bouman, C (Institute of Electrical and Electronics Engineers (IEEE), 2000)
    Text en actes de congrés
    Accés obert
    The objective of this work is to provide a simple and yet efficient tool to detect human faces in video sequences. This information can be very useful for many applications such as video indexing and video browsing. In ...
  • Automatic face recognition of video sequences using self-eigenfaces 

    Torres Urgell, Lluís; Lorente, Luis; Vilà Guerau de Arellano, Jordi (-, 2000)
    Text en actes de congrés
    Accés obert
    The objective of this work is to provide an efficient face recognition scheme useful for video indexing applications. In particular we are addressing the following problem: given a set of known images and given a video ...
  • Score extraction usign MPEG-4 T/F partial encoding 

    Tarrés Ruiz, Francisco (Institute of Electrical and Electronics Engineers (IEEE), 2000)
    Text en actes de congrés
    Accés obert
    This paper describes the preliminary work in the development of an MPEG-4 audio transcoder between the time/frequency (T/F) and the structured audio (SA) formats. Our approach consists in not going from T/F format through ...
  • DSP-based ionospheric radiolink using DS-CDMA and on-line channel estimation 

    Pijoan, J L; Socor, J C; Moran, J A; Tarrés Ruiz, Francisco (Institute of Electrical and Electronics Engineers (IEEE), 2000)
    Text en actes de congrés
    Accés obert
    In this paper, a new blind multiuser detection algorithm is presented. It can both cancel multiuser interference and estimate the multipath channel response in a blind way. The method has been specially conceived for low ...
  • 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 ...
  • New receivers for DS-SS in time variant multipath channels based on the PN alignment concept 

    Socoro, J; Pijoan, J L; Moran, J A; Tarrés Ruiz, Francisco (Institute of Electrical and Electronics Engineers (IEEE), 2000)
    Text en actes de congrés
    Accés obert
    We present new combined blind equalization and detection schemes for a DS-SS system. The new proposed algorithms improve the bit error rate compared to traditional RAKE receivers in time-variant channels with multipath. ...
  • A contribution to video coding using layers 

    Torres Urgell, Lluís; Lecha, M (1998)
    Text en actes de congrés
    Accés obert
    Layered representations of video sequences, originally introduced in [1], are important in several applications. Specifically, they are very appropriate for object tracking, object manipulation, content-based scalability ...
  • An experimental course on digital communications 

    Bertran Albertí, Eduardo; Tarrés Ruiz, Francisco; Montoro López, Gabriel (IEEE PRESS, 1998)
    Text en actes de congrés
    Accés obert
    In this paper a laboratory course on digital communications is presented. This course has been designed for medium degree professionals in the telecommunications field, and it is based on training equipment developed to ...
  • Second generation video coding schemes and their role in mpeg-4 

    Torres Urgell, Lluís (UNIVERSITÉ CATHOLIQUE DE LOUVAIN 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 ...

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