Now showing items 1-20 of 100

    • 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 ...
    • 3D modelling of leaves from color and ToF data for robotized plant measuring 

      Alenyà Ribas, Guillem; Dellen, Babette; Torras, Carme (2011)
      Conference report
      Restricted access - publisher's policy
      Supervision of long-lasting extensive botanic experiments is a promising robotic application that some recent technological advances have made feasible. Plant modelling for this application has strong demands, particularly ...
    • 3D point cloud segmentation using a fully connected conditional random field 

      Lin, Xiao; Casas Pla, Josep Ramon; Pardàs Feliu, Montse (Institute of Electrical and Electronics Engineers (IEEE), 2017)
      Conference lecture
      Restricted access - publisher's policy
      Traditional image segmentation methods working with low level image features are usually difficult to adapt to higher level tasks, such as object recognition and scene understanding. Object segmentation emerges as a new ...
    • 3D point cloud video segmentation oriented to the analysis of interactions 

      Lin, Xiao; Casas Pla, Josep Ramon; Pardàs Feliu, Montse (Institute of Electrical and Electronics Engineers (IEEE), 2016)
      Conference lecture
      Open Access
      Given the widespread availability of point cloud data from consumer depth sensors, 3D point cloud segmentation becomes a promising building block for high level applications such as scene understanding and interaction ...
    • A comparison study of U-Net based methods for brain tumor segmentation 

      Ferrando Garrido, Albert (Universitat Politècnica de Catalunya, 2023-10-19)
      Master thesis
      Open Access
      Covenantee:   Universitat de Barcelona
      The brain tumor segmentation (BraTS) Challenge is an international competition that focuses on the task of automated segmentation of the different parts of brain tumors in magnetic resonance imaging (MRI) scans. U-Net ...
    • A contribution to video coding using layers 

      Torres Urgell, Lluís; Lecha, M (1998)
      Conference report
      Open Access
      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 ...
    • 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 robust motion estimation and segmentation approach to represent moving images with layers 

      Torres Urgell, Lluís; García Luque, David; MATES, A (IEEE COMPUTER SOCIETY, 1997)
      Conference report
      Open Access
      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 ...
    • 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 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)
      Conference report
      Open Access
      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 ...
    • 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 detection and depth estimation of table grapes and peduncles for robot harvesting, combining monocular depth estimation and CNN methods 

      Coll Ribes, Gabriel; Torres Rodriguez, Ivan Jesús; Grau Saldes, Antoni; Guerra Paradas, Edmundo; Sanfeliu Cortés, Alberto (Elsevier, 2023-12)
      Article
      Open Access
      Precision agriculture is a growing field in the agricultural industry and it holds great potential in fruit and vegetable harvesting. In this work, we present a robust accurate method for the detection and localization of ...
    • Active mesh coding and rate-distortion theory 

      Salembier Clairon, Philippe Jean; Martí Navarro, Eva; Pardàs Feliu, Montse (Institute of Electrical and Electronics Engineers (IEEE), 1996)
      Conference lecture
      Open Access
      This paper presents a video coding scheme for very low bit rate applications. The coding approach relies on active meshes and can be viewed as a particular case of region-based coding. The active mesh is used to efficiently ...
    • An efficient technique of texture representation in segmentation-based image coding schemes 

      Torres Urgell, Lluís; Casas Pla, Josep Ramon; Campins, J (IEEE IEEE, 1995)
      Conference report
      Open Access
      In segmentation-based image coding techniques the image to be compressed is first segmented. Then, the information is coded describing the shape and the interior of the regions. A new method to encode the texture obtained ...
    • An innovative image processing-based framework for the numerical modelling of cracked masonry structures 

      Sarhosis, Vasilis; Loverdos, Dimitrios; Adamopoulos, Efstathios; Drougkas, Anastasios (Elsevier, 2021-05)
      Article
      Open Access
      A vital aspect when modelling the mechanical behaviour of existing masonry structures is the accuracy in which the geometry of the real structure is transferred in the numerical model. Commonly, the geometry of masonry is ...
    • Anisotropic mesh adaptation for region-based segmentation accounting for image spatial information 

      Giacomini, Matteo; Perotto, Simona (2022-09-01)
      Article
      Open Access
      A finite element-based image segmentation strategy enhanced by an anisotropic mesh adaptation procedure is presented. The methodology relies on a split Bregman algorithm for the minimisation of a region-based energy ...
    • Automatic post-processing of left atrium segmentations 

      Borrell Araunabeña, Laia (Universitat Politècnica de Catalunya, 2023-05-16)
      Master thesis
      Restricted access - author's decision
      Covenantee:   ADAS3D Medical / Universitat de Barcelona / Universitat Rovira i Virgili
      Cardiac anatomical segmentation is an essential step in many clinical applications that require quantitative measures such as myocardial mass and ventricle volume. Traditionally, these segmentations were manually performed ...
    • Background subtraction in AV productions without chroma-key 

      Martinez Mardones, Sara (Universitat Politècnica de Catalunya, 2024-02-02)
      Bachelor thesis
      Open Access
      En este trabajo de fin de grado se propone un cambio de paradigma en los entornos de producción audiovisual para prescindir del croma en escenas donde se requiera una sustitución del fondo. Se propone un modelo de segmentación ...
    • Binary partition tree as a polarimetric SAR data representation in the space-time domain 

      Alonso González, Alberto; López Martínez, Carlos; Salembier Clairon, Philippe Jean (IEEE, 2011)
      Conference lecture
      Restricted access - publisher's policy
      The aim of this paper is to present a Polarimetric Synthetic Aperture Radar data processing technique on the space-time domain. This approach is based on a Binary Partition Tree (BPT), which is a region-based and multi-scale ...
    • Binary partition tree as an efficient representation for filtering, segmentation and information retreival 

      Salembier Clairon, Philippe Jean; Garrido Ostermann, Luis (Institute of Electrical and Electronics Engineers (IEEE), 1998)
      Conference report
      Open Access
      This paper discusses the interest of binary partition trees as shape-oriented image representations. Binary partition trees concentrate in a compact and structured representation a set of meaningful regions that can be ...