http://hdl.handle.net/10553/7422 2013-05-21T11:30:41Z 2013-05-21T11:30:41Z Sánchez Pérez, Javier Monzón López, Nelson Salgado de la Nuez, Agustín Javier http://hdl.handle.net/10553/7429 2012-05-22T12:13:20Z 2012-03-16T00:00:00Z

Título : Parallel implementation of a robust optical flow technique Autor : Sánchez Pérez, Javier; Monzón López, Nelson; Salgado de la Nuez, Agustín Javier Resumen : [EN] The accuracy and performance of current variational optical ow methods have considerably increased during the last years. The complexity of these techniques is high and enough care has to be taken for the implementation. The aim of this work is to present a comprehensible implementation of recent variational optical flow methods. We start with an energy model that relies on brightness and gradient constancy terms and a ow-based smoothness term. We minimize this energy model and derive an e cient implicit numerical scheme. In the experimental results, we evaluate the accuracy and performance of this implementation with the Middlebury benchmark database. We show that it is a competitive solution with respect to current methods in the literature. In order to increase the performance, we use a simple strategy to parallelize the execution on multi-core processors.

2012-03-16T00:00:00Z Alemán Flores, Miguel Álvarez León, Luis Henríquez Castellano, Pedro Trujillo Pino, Agustín http://hdl.handle.net/10553/8701 2012-11-12T13:35:45Z 2012-09-12T23:00:00Z

Título : Augmented reality in sport scenarios using cameras mounted on a tripod Autor : Alemán Flores, Miguel; Álvarez León, Luis; Henríquez Castellano, Pedro; Trujillo Pino, Agustín Resumen : [ES] In this paper we address the problem of inserting virtual content in a video sequence. The method we propose uses just image information. We perform primitive tracking, camera calibration, real and virtual camera synchronisation and finally rendering to insert the virtual content in the real video sequence. To simplify the calibration step we assume that cameras are mounted on a tripod (which is a common situation in practise). The primitive tracking procedure, which uses lines and circles as primitives, is performed by means of a CART (Classification and Regression Tree). Finally, the virtual and real camera synchronisation and rendering is performed using functions of OpenGL (Open Graphic Library). We have applied the method proposed to sport event scenarios, specifically, soccer matches. In order to illustrate its performance, it has been applied to real HD (High Definition) video sequences. The quality of the proposed method is validated by inserting virtual elements in such HD video sequence.

2012-09-12T23:00:00Z