Now showing items 1-20 of 95

    • 3D hierarchical optimization for multi-view depth map coding 

      Maceira, Marc; Varas, David; Morros Rubió, Josep Ramon; Ruiz Hidalgo, Javier; Marqués Acosta, Fernando (2017-11-28)
      Article
      Open Access
      Depth data has a widespread use since the popularity of high resolution 3D sensors. In multi-view sequences, depth information is used to supplement the color data of each view. This article proposes a joint encoding of ...
    • A contour matching approach for accurate NOAA-AVHRR image navigation 

      Eugenio, F; Marqués Acosta, Fernando; Suarez, E; Rovaris, E (Eurasip, 2000)
      Conference report
      Open Access
      Although different methods for NOAA AVHRR image navigation have already been established, the multitemporal and multi-satellite character of most studies requires automatic and accurate methods for navigation of satellite ...
    • A contour-based approach to binary shape coding using a multiple grid chain code 

      Nunes, P; Marqués Acosta, Fernando; Pereira, F; Gasull Llampallas, Antoni (2000-05)
      Article
      Open Access
      This paper presents a contour-based approach to efficiently code binary shape information in the context of object-based video coding. This approach meets some of the most important requirements identified for the MPEG-4 ...
    • A morphological approach for segmentation and tracking of human faces 

      Marqués Acosta, Fernando; Vilaplana Besler, Verónica (Barcelona, 2000)
      Conference lecture
      Open Access
      A new technique for segmenting and tracking human faces in video sequences is presented. The technique relies on morphological tools such as using connected operators to extract the connected component that more likely ...
    • A proposal for dependent optimization in scalabale region-based coding systems 

      Morros, R; Marqués Acosta, Fernando (Institute of Electrical and Electronics Engineers (IEEE), 1999)
      Conference report
      Open Access
      We address in this paper the problem of optimal coding in the framework of region-based video coding systems, with a special stress on content-based functionalities. We present a coding system that can provide scaled layers ...
    • A segmentation-based coding system allowing manipulation of objects (sesame) 

      Marqués Acosta, Fernando; Salembier Clairon, Philippe Jean; Pardàs Feliu, Montse; Marcotegui Iturmendi, Beatriz (IEEE, 1996)
      Conference report
      Open Access
      We present a coding scheme that achieves, for each image in the sequence, the best segmentation in terms of rate-distortion theory. It is obtained from a set of initial regions and a set of available coding techniques. The ...
    • A video object generation tool allowing friendly user interaction 

      Marcotegui Iturmendi, Beatriz; Correia Fernandez-Pereira, Paulo; Marqués Acosta, Fernando; Mech, R.; Rosa, R; Wollborn, M; Zanoguera, Francisca (Institute of Electrical and Electronics Engineers (IEEE), 1999)
      Conference report
      Open Access
      In this paper we describe an interactive video object segmentation tool developed in the framework of the ACTS-AC098 MOMUSYS project. The Video Object Generator with User Environment (VOGUE) combines three different sets ...
    • Accurate and automatic NOAA-AVHRR image navigation using a global contour matching approach 

      Eugenio, F; Marqués Acosta, Fernando; Gómez, L; Suarez, E; Rovaris, E (2000)
      Conference report
      Open Access
      The problem of precise and automatic AVHRR image navigation is tractable in theory, but has proved to be somewhat difficult in practice. The authors' work has been motivated by the need for a fully automatic and operational ...
    • Actividades en procesado de la imagen del Grupo de Procesado de Señal 

      Marqués Acosta, Fernando; Gasull Llampallas, Antoni; Torres Urgell, Lluís (Escola Tècnica Superior d'Enginyers de Telecomunicació de Barcelona, 1993)
      Article
      Open Access
    • Allowing content-based functionalities in segmentation-based coding schemes 

      Marcotegui Iturmendi, Beatriz; Marqués Acosta, Fernando; Meyer, F (1997-08)
      Article
      Open Access
      This paper deals with the use of the segmentation tools and principles presented in [10] and [13] for allowing content-based functionalities. In this framework, means for supervised selection of objects in the scene are ...
    • Analysis of urban and vegetation growing in NW Senegal during the last 25 years using medium resolution imagery 

      Marcello, Javier; Calderero Patino, Felipe; Eugenio, Francisco; Marqués Acosta, Fernando (Institute of Electrical and Electronics Engineers (IEEE), 2014)
      Conference report
      Restricted access - publisher's policy
      Land use and land cover information are key information for Governments in developing countries. In this context, remote sensing satellites like Landsat or SPOT can provide valuable data covering several decades. We have ...
    • Análisis de no estacionariedades en la interpolación de imágenes. Aplicación a codificación piramidal y zoom 

      Gasull Llampallas, Antoni; Marqués Acosta, Fernando; Torres Urgell, Lluís (1991)
      Conference report
      Open Access
      In some applications of digital image processing the fact that an image is a non estacionary signal can cause some undesirable effects. That is the case of block effect in transform coding, or destructive effects on contours ...
    • Automatic left ventricular contour extraction for volume calculation from echocardiographic images 

      Gasull Llampallas, Antoni; Torres Urgell, Lluís; Marqués Acosta, Fernando; Vázquez Grau, Gregorio (1989)
      Conference report
      Open Access
      This paper presents a new fully automated algorithm that extracts LV epicardial and endocardial borders from 2-D echocardiograms. The method is based on a radial search approach, which is the best way to use some a priori ...
    • Bags of local convolutional features for scalable instance search 

      Mohedano, Eva; Salvador Aguilera, Amaia; McGuinness, Kevin; Marqués Acosta, Fernando; O'Connor, Noel; Giró Nieto, Xavier (Association for Computing Machinery (ACM), 2016)
      Conference lecture
      Open Access
      This work proposes a simple instance retrieval pipeline based on encoding the convolutional features of CNN using the bag of words aggregation scheme (BoW). Assigning each local array of activations in a convolutional layer ...
    • Caption text extraction for indexing purposes using a hierarchical region-based image model 

      León Cristóbal, Míriam; Vilaplana Besler, Verónica; Gasull Llampallas, Antoni; Marqués Acosta, Fernando (2010-02-17)
      Conference lecture
      Open Access
      This paper presents a technique for detecting caption text for indexing purposes. This technique is to be included in a generic indexing system dealing with other semantic concepts. The various object detection algorithms ...
    • Classical methods of left ventricular contour extraction and preprocessing of echocardiographic images: a review 

      Torres Urgell, Lluís; Gasull Llampallas, Antoni; Marqués Acosta, Fernando (1989)
      Conference report
      Open Access
      A main objective of digital processing of echocardiographic images is to improve the signal to noise ratio of the video images acquired from the ultrasound equipment along with contour extraction in order to obtain cardiac ...
    • Cloud motion estimation in seviri image sequences 

      Marcello, Javier; Eugenio, Francisco Javier; Marqués Acosta, Fernando (2009)
      Conference report
      Open Access
      Determination of atmospheric dynamic characteristics from remote sensing imagery is fundamental in weather and climate studies. The SEVIRI radiometer, on board the MSG, with its 12 bands and 15 minutes sensing ...
    • Coagulation time detection by means of a real-time image processing 

      Gasull Llampallas, Antoni; Vallverdú Bayés, Sisco; Marqués Acosta, Fernando (. IEEE, 1992)
      Conference report
      Open Access
      Several techniques for semi-automatic or automatic detection of coagulation time in blood or in plasma analysis are available in the literature. However, these techniques are either complex and demand for specialized ...
    • Codificacion de imagenes: un metodo de segunda generacion 

      Marqués Acosta, Fernando; Gasull Llampallas, Antoni (Universidad de Málaga, 1992)
      Conference report
      Open Access
    • Codig-oriented segmentation based on g-m random 

      Marqués Acosta, Fernando; Gasull Llampallas, Antoni (1991)
      Conference report
      Open Access
      A new segmentation algorithm for still black and white images is introduced. This algorithm forms the basis of a region-oriented sequence coding technique, currently under development. The algorithm models the human mechanism ...