Now showing items 41-60 of 77

  • Morphological operators for image and video compression 

    Salembier Clairon, Philippe Jean; Brigger, P; Casas Pla, Josep Ramon; Pardàs Feliu, Montse (1996-06)
    Article
    Open Access
    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 ...
  • MPEG-4 : una nueva representación de la información audio-visual 

    Casas Pla, Josep Ramon; Marqués Acosta, Fernando; Salembier Clairon, Philippe Jean (Escola Tècnica Superior d'Enginyers de Telecomunicació de Barcelona, 1996)
    Article
    Open Access
  • Multi-camera multi-object voxel-based Monte Carlo 3D tracking strategies 

    Canton Ferrer, Cristian; Casas Pla, Josep Ramon; Pardàs Feliu, Montse; Monte Moreno, Enrique (HINDAWI, 2011-11-23)
    Article
    Open Access
    This article presents a new approach to the problem of simultaneous tracking of several people in low-resolution sequences from multiple calibrated cameras. Redundancy among cameras is exploited to generate a discrete 3D ...
  • Multi-person tracking strategies based on voxel analysis 

    Canton Ferrer, Cristian; Salvador Marcos, Jordi; Casas Pla, Josep Ramon; Pardàs Feliu, Montse (2008-06)
    Article
    Restricted access - publisher's policy
    This paper presents two approaches to the problem of simultaneous tracking of several people in low resolution sequences from multiple calibrated cameras. Spatial redundancy is exploited to generate a discrete 3D binary ...
  • Multi-resolution illumination compensation for foreground extraction 

    Suau Cuadros, Xavier; Casas Pla, Josep Ramon; Ruiz Hidalgo, Javier (2009-11)
    Conference lecture
    Open Access
    Illumination changes may lead to false foreground (FG) segmentation and tracking results. Most of the existing FG extraction algorithms obtain a background (BG) estimation from temporal statistical parameters. Such ...
  • Multi-view body tracking with a detector-driven hierarchical particle filter 

    Navarro, S.; López Méndez, Adolfo; Alcoverro Vidal, Marcel; Casas Pla, Josep Ramon (Springer, 2012)
    Conference report
    Restricted access - publisher's policy
    In this paper we present a novel approach to markerless human motion capture that robustly integrates body part detections in multiple views. The proposed method fuses cues from multiple views to enhance the propagation ...
  • Multi-view video representation based on fast Monte Carlo surface reconstruction 

    Salvador Marcos, Jordi; Casas Pla, Josep Ramon (2013-09)
    Article
    Restricted access - publisher's policy
    This paper provides an alternative solution to the costly representation of multi-view video data, which can be used for both rendering and scene analyses. Initially, a new efficient Monte Carlo discrete surface ...
  • New approaches to texture coding in segmentation and feature-based image coding schemes 

    Torres Urgell, Lluís; Casas Pla, Josep Ramon (. S.N., 1995)
    Conference report
    Open Access
  • Oriented radial distribution on depth data: application to the detection of end-effectors 

    Suau Cuadros, Xavier; Ruiz Hidalgo, Javier; Casas Pla, Josep Ramon (IEEE, 2012)
    Conference lecture
    Open Access
  • Person tracking 

    Bernardin, Keni; Stiefelhagen, Rainer; Pnevmatikakis, Aristodemos; Lanz, Oswald; Brutti, Alessio; Casas Pla, Josep Ramon; Potamianos, Gerasimos (Springer-Verlag, 2009-05-31)
    Part of book or chapter of book
    Restricted access - publisher's policy
    One of the most basic building blocks for the understanding of human actions and interactions is the accurate detection and tracking of persons in a scene. In constrained scenarios involving at most one subject, or in ...
  • Photo-consistent surfaces from a sparse set of viewpoints 

    Salvador Marcos, Jordi; Casas Pla, Josep Ramon (2010)
    Conference lecture
    Restricted access - publisher's policy
    We address the problem of reconstructing 3D shapes from color data available in a sparse set of views from all directions of a scene. As an advantage when compared to multiview stereo approaches, our method is able to ...
  • Prediction error image coding using a modified stochastic vector quantization scheme 

    Torres Urgell, Lluís; Casas Pla, Josep Ramon (IEEE, 1996)
    Conference report
    Open Access
    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 ...
  • Projecte COM@WEB: plataforma web d'aprenentatge intel•ligent de processament del Senyal i Comunicacions. 

    Cabrera-Bean, Margarita; Fernández Rubio, Juan Antonio; Giró, Xavier; Closas, Pau; Rey Micolau, Francesc; Fernández Prades, Carlos; Sala, Josep; Villares Piera, Nemesio Javier; Gasull Llampallas, Antoni; Casas Pla, Josep Ramon (Universitat Politècnica de Catalunya. Institut de Ciències de l'Educació, 2007-06-28)
    Conference report
    Open Access
    La plataforma d’e-learning: comweb.upc.edu és una eina multimèdia de suport a l’estudi, l’experimentació i l’adquisició de tècniques d’auto-aprenentatge. COM@WEB s’ofereix com a punt de trobada entre estudiants, professors ...
  • Real-time 3D multi-person tracking using Monte Carlo surface sampling 

    Canton Ferrer, Cristian; Casas Pla, Josep Ramon; Pardàs Feliu, Montse (2010)
    Conference report
    Open Access
    The current paper presents a low-complexity approach to the problem of simultaneous tracking of several people in low resolution sequences from multiple calibrated cameras. Redundancy among cameras is exploited to ...
  • Real-time fingertip localization conditioned on hand gesture classification 

    Suau, Xavier; Alcoverro Vidal, Marcel; López-Méndez, Adolfo; Ruiz Hidalgo, Javier; Casas Pla, Josep Ramon (2014-05-09)
    Article
    Restricted access - publisher's policy
    A method to obtain accurate hand gesture classification and fingertip localization from depth images is proposed. The Oriented Radial Distribution feature is utilized, exploiting its ability to globally describe hand poses, ...
  • Real-time head and hand tracking based on 2.5D data 

    Suau Cuadros, Xavier; Casas Pla, Josep Ramon; Ruiz Hidalgo, Javier (2011)
    Conference report
    Restricted access - publisher's policy
    A novel real-time algorithm for head and hand tracking is proposed in this paper. This approach is based on 2.5D data from a range camera, which is exploited to resolve ambiguities and overlaps. Experimental results show ...
  • Real-time head and hand tracking based on 2.5D data 

    Suau Cuadros, Xavier; Ruiz Hidalgo, Javier; Casas Pla, Josep Ramon (2012-06)
    Article
    Restricted access - publisher's policy
    A novel real-time algorithm for head and hand tracking is proposed in this paper. This approach is based on data from a range camera, which is exploited to resolve ambiguities and overlaps. The position of the head is ...
  • Real-time upper body tracking with online initialization using a range sensor 

    López Méndez, Adolfo; Alcoverro Vidal, Marcel; Pardàs Feliu, Montse; Casas Pla, Josep Ramon (2011)
    Conference report
    Restricted access - publisher's policy
    We present a novel method for upper body pose estimation with online initialization of pose and the anthropometric profile. Our method is based on a Hierarchical Particle Filter that defines its likelihood function with ...
  • Registration of images to unorganized 3D point clouds using contour cues 

    Pujol Miró, Alba; Ruiz Hidalgo, Javier; Casas Pla, Josep Ramon (Institute of Electrical and Electronics Engineers (IEEE), 2017)
    Conference report
    Open Access
    Low resolution commercial 3D sensors contribute to computer vision tasks even better when the analysis is carried out in a combination with higher resolution image data. This requires registration of 2D images to ...
  • Representing and retrieving regions using binary partition trees 

    Garrido Ostermann, Luis; Salembier Clairon, Philippe Jean; Casas Pla, Josep Ramon (Institute of Electrical and Electronics Engineers (IEEE), 1999)
    Conference report
    Open Access
    This paper discusses the interest of Binary Partition Trees for image and region representation in the context of indexing and similarity based retrieval. Binary Partition Trees concentrate in a compact and structured way ...