Fernando Pérez Nava

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This paper presents a new technique to simultaneously estimate the depth map and the all-in-focus image of a scene, both at super-resolution, from a plenoptic camera. A plenoptic camera uses a microlens array to measure the radiance and direction of all the light rays in a scene. It is composed of n×n microlenses and each of them generates a m×m image.(More)
This paper describes the Discrete Focal Stack Transform (DFST) that computes the focal stack (a collection of photographs focused at different depths) from a lightfield. It proposes a new discretization of the Photography operator based on the interpolation of the lightfield by means of 4D trigonometric polynomials and an approximation to the integration(More)
This paper proposes a new model for contour deformations using wavelets. This model uses Sobolev spaces to control the smoothness of the contour deformation. This formulation defines a probabilistic model that induces a prior distribution for contour deformation. Based on this distribution, the fitting problem is solved in bayesian terms. The deformation(More)
A technique is presented to construct a muniscale representation of planar contours based on the multiwavelet transform (MWT). To generate this multiwavelet description, a partial 1-D discrete multiwavelet transform (DMWT) is applied to the vertical and horizontal components of a length-parametrized planar curve. This muniscale representation descomposes(More)
This paper proposes a combination of contour deformation modelling in Sobolev spaces and the Condensation filter to track an object over a sequence of images. As Sobolev spaces are smoothness spaces this allows to control the smoothness of the contour deformation extending previous wavelet representations. We also introduce a probabilistic model for the(More)
A technique is presented to construct a multiscale representation of planar contours based on the wavelet transform (WT). To generate this wavelet description, a partial 1-D discrete wavelet transform (DWT) is applied to the vertical and horizontal components of a lengthparametrized planar curve. This multiscale representation descomposes the curve into(More)