Search Results for author: Vania V. Estrela

Found 8 papers, 0 papers with code

Oriented bounding boxes using multiresolution contours for fast interference detection of arbitrary geometry objects

no code implementations11 Nov 2016 L. A. Rivera, Vania V. Estrela, P. C. P. Carvalho

The hierarchically structured bounding boxes help us to quickly isolate the contour of segments in interference.

Error concealment by means of motion refinement and regularized Bregman divergence

no code implementations10 Nov 2016 Alessandra M. Coelho, Vania V. Estrela, Felipe P. do Carmo, Sandro R. Fernandes

This work addresses the problem of error concealment in video transmission systems over noisy channels employing Bregman divergences along with regularization.

Regularized Pel-Recursive Motion Estimation Using Generalized Cross-Validation and Spatial Adaptation

no code implementations4 Nov 2016 Vania V. Estrela, Luis A. Rivera, Paulo C. Beggio, Ricardo T. Lopes

The computation of 2-D optical flow by means of regularized pel-recursive algorithms raises a host of issues, which include the treatment of outliers, motion discontinuities and occlusion among other problems.

Motion Estimation Optical Flow Estimation

Adaptive mixed norm optical flow estimation

no code implementations3 Nov 2016 Vania V. Estrela, Matthias O. Franz, Ricardo T. Lopes, G. P. De Araujo

It relies on the use of a data-driven technique called Mixed Norm (MN) to estimate the best motion vector for a given pixel.

Optical Flow Estimation

EM-Based Mixture Models Applied to Video Event Detection

no code implementations10 Oct 2016 Alessandra Martins Coelho, Vania V. Estrela

Surveillance system (SS) development requires hi-tech support to prevail over the shortcomings related to the massive quantity of visual information from SSs.

Event Detection General Classification

Sub-pixel accuracy edge fitting by means of B-spline

no code implementations31 Mar 2016 R. L. B. Breder, Vania V. Estrela, J. T. de Assis

The data likelihood is computed as a consequence of the observation model which includes both orientation and position information.

Position

Total Variation Applications in Computer Vision

no code implementations31 Mar 2016 Vania V. Estrela, Hermes Aguiar Magalhaes, Osamu Saotome

The objectives of this chapter are: (i) to introduce a concise overview of regularization; (ii) to define and to explain the role of a particular type of regularization called total variation norm (TV-norm) in computer vision tasks; (iii) to set up a brief discussion on the mathematical background of TV methods; and (iv) to establish a relationship between models and a few existing methods to solve problems cast as TV-norm.

Blind signal separation and identification of mixtures of images

no code implementations26 Mar 2016 Felipe P. do Carmo, Joaquim T. de Assis, Vania V. Estrela, Alessandra M. Coelho

In this paper, a fresh procedure to handle image mixtures by means of blind signal separation relying on a combination of second order and higher order statistics techniques are introduced.

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