Browsing by Author "Caselles, Vicente"

Sort by: Order: Results:

  • A contrario selection of optimal partitions for image segmentation
    Cardelino, Juan; Caselles, Vicente; Bertalmío, Marcelo; Randall, Gregory (SIAM (Society for Industrial and Applied Mathematics), 2013)
    We present a novel segmentation algorithm based on a hierarchical representation of images. The main contribution of this work is to explore the capabilities of the a contrario reasoning when applied to the segmentation ...
  • A Parabolic quasilinear problem for linear growth functionals
    Andreu, Fuensanta; Caselles, Vicente; Mazón, José (European Mathematical Society (EMS), 2002)
    We prove existence and uniqueness of solutions for the Dirichlet problem for quasilinear parabolic equations in divergent form for which the energy functional has linear growth. A typical example of energy functional we ...
  • A variational model for P+XS image fusion
    Ballester, Coloma; Caselles, Vicente; Igual, Laura; Verdera, Joan; Rougé, Bernard (Springer, 2006)
    We propose an algorithm to increase the resolution of multispectral satellite images knowing the panchromatic image at high resolution and the spectral channels at lower resolution. Our algorithm is based on the assumption ...
  • An analysis of visual adaptation and contrast perception for tone mapping
    Ferradans Ramonde, Sira; Bertalmío, Marcelo; Provenzi, Edoardo; Caselles, Vicente (Institute of Electrical and Electronics Engineers (IEEE), 2011)
    Tone Mapping is the problem of compressing the range of a High-Dynamic Range image so that it can be displayed in a Low-Dynamic Range screen, without losing or introducing novel details: The final image should produce in ...
  • An inpainting-based deinterlacing method
    Ballester, Coloma; Bertalmío, Marcelo; Caselles, Vicente; Garrido Ostermann, Luis; Marques, Adrián; Ranchin, Florent (Institute of Electrical and Electronics Engineers (IEEE), 2007)
    Video is usually acquired in interlaced format, where each image frame is composed of two image fields, each field/nholding same parity lines. However, many display devices require progressive video as input; also, many ...
  • Automatic low baseline stereo in urban areas
    Igual, Laura; Preciozzi, Javier; Garrido, Luís; Almansa, Andrés; Caselles, Vicente; Rougé, Bernard (AIMS American Institute of Mathematical Sciences, 2007)
    In this work we propose a new automatic methodology for computing accurate digital elevation models (DEMs) in urban environments from low baseline stereo pairs that shall be available in the future from a new kind of earth ...
  • Color image processing problems in digital photography
    Ferradans Ramonde, Sira (Universitat Pompeu Fabra, 2011-11-11)
    In this thesis, we discuss three image processing topics: High Dynamic Range (HDR) image creation in scenes with motion, Tone Mapping (TM), and Demosaicking. The first part of this thesis focuses on the creation of HDR ...
  • Disocclusion by joint interpolation of vector fields and gray levels
    Ballester, Coloma; Caselles, Vicente; Verdera, Joan (SIAM (Society for Industrial and Applied Mathematics), 2006)
    In this paper we study a variational approach for filling in regions of missing data in two-dimensional and three-dimensional digital images. Applications of this technique include the restoration of old photographs and ...
  • Exemplar-based interpolation of sparsely sampled images
    Facciolo Furlan, Gabriele; Arias Martínez, Pablo; Caselles, Vicente; Sapiro, Guillermo (Springer, 2009)
    A nonlocal variational formulation for interpolating a sparsel sampled image is introduced in this paper. The proposed variational formulation, originally motivated by image inpainting problems, encourages/nthe transfer ...
  • Filling-in by joint interpolation of vector fields and gray levels
    Ballester, Coloma; Bertalmío, Marcelo; Caselles, Vicente; Sapiro, Guillermo; Verdera, Joan (Institute of Electrical and Electronics Engineers (IEEE), 2001)
    A variational approach for filling-in regions of missing data in digital images is introduced. The approach is based on joint interpolation of the image gray levels and gradient/isophotes directions, smoothly extending in ...
  • Geometry-based demosaicking
    Ferradans Ramonde, Sira; Bertalmío, Marcelo; Caselles, Vicente (Institute of Electrical and Electronics Engineers (IEEE), 2009)
    Demosaicking is a particular case of interpolation problems where, from a scalar image in which each pixel has either the red, the green or the blue component, we want to interpolate the full-color image. State-of-the-art ...
  • Irregular to regular sampling, denoising and deconvolution
    Facciolo Furlan, Gabriele; Almansa, Andrés; Aujol, Jean-François; Caselles, Vicente (SIAM (Society for Industrial and Applied Mathematics), 2009)
    We propose a restoration algorithm for band limited images that considers irregular/n(perturbed) sampling, denoising, and deconvolution. We explore the application of a family of/nregularizers that allow to control the ...
  • Irregularly sampled image resortation and interpolation
    Facciolo Furlan, Gabriele (Universitat Pompeu Fabra, 2011-05-16)
    The generation of urban digital elevation models from satellite images using stereo reconstruction techniques poses several challenges due to its precision requirements. In this thesis we study three problems related to ...
  • Level lines selection with variational models for segmentation and encoding
    Ballester, Coloma; Caselles, Vicente; Igual, Laura; Garrido, Luís (Springer, 2007)
    This paper discusses the interest of the Tree of Shapes of an image as a region oriented image representation. The Tree of Shapes offers a compact and structured representation of the family of level lines of an image. ...
  • Lower semicontinuity of the affine total variation used in image segmentation
    Ballester, Coloma; Caselles, Vicente; González Hidalgo, Manuel (Unión Matemática Argentina, 1998)
    We study the Affine Total Variation, a magnitude measuring the affine complexity of finite unions of continua, in particular, Jordan curves, appearing in an affine invariant analogue of Mumford-Shah energy functional used ...
  • The M-components of level sets of continuous functions in WBV
    Ballester, Coloma; Caselles, Vicente (Universitat Autònoma de Barcelona, 2001)
    We prove that the topographic map structure ofupper semicontinuous functions, defined in terms of classical connected components ofits level sets, and offunctions ofbounded variation (or a generalization, the WBV functions), ...
  • Morphological and statistical techniques for the analysis of 3D images
    Meinhardt Llopis, Enric (Universitat Pompeu Fabra, 2011-05-16)
    Aquesta tesi proposa una estructura de dades per emmagatzemar imatges tridimensionals. L'estructura da dades té forma d'arbre i codifica les components connexes dels conjunts de nivell de la imatge. Aquesta estructura ...
  • Morse description and morphological encoding of continuous data
    Caselles, Vicente; Sapiro, Guillermo; Solé, Andrés; Ballester, Coloma (SIAM (Society for Industrial and Applied Mathematics), 2006)
    A geometric representation for images is studied in this work. This is based on two complementary geometric structures for the topographic representation of an image. The first one computes a description of the Morse ...
  • Multiscale analysis of similarities between images on Riemannian manifolds
    Ballester, Coloma; Calderero, Felipe; Caselles, Vicente; Facciolo Furlan, Gabriele (SIAM (Society for Industrial and Applied Mathematics), 2014)
    In this paper we study the problem of comparing two patches of an image defined on a Riemannian manifold, which can be defined by the image domain with a suitable metric depending on the image. The size of the patch will ...
  • Numerical simulation of shallow water equations and some physical models in image processing
    Haro Ortega, Gloria (Universitat Pompeu Fabra, 2011-04-12)
    There are two main subjects in this thesis: the first one deals with the numerical simulation of shallow water equations, the other one is the resolution of some problems in image processing<br/><br/>The first part of this ...

Search DSpace

Browse

My Account

In collaboration with Compliant to Partaking