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Système avancé d'interpolation spatiale de signaux de télévision pour affichage sur écrans Haute-Définition

Abstract : The recent success of high definition screens has increased the need of interpolation algorithms, to display images or videos which resolution is smaller than the screen resolution. We propose a new image interpolation process, based on a multiresolution edge orientation analysis. The goal of this technique is to correct usual artifacts that appear on edges when classical interpolation methods are used (bilinear, bicubic), without introducing new artifacts that are often produced by directional interpolations. Our orientation estimation, based on a quadtree division and a multiresolution approach is evaluated and compared to two other state-of-the-art methods (Radon transform, and the projection method used in the Bandlet transform algorithm), to study its advantages in the context of an application to natural images. Then, we introduce our interpolation technique, based on an isotropic reference interpolation (cubic-spline) that is corrected by a two-dimension Gaussian filter, locally oriented in the direction of the edge. Edge-free regions are preserved with a Gabor mask that is built to protect pixels which do not need any correction. Finally, our results are compared to recent state-of-the-art directional interpolations to illustrate the good performance of our algorithm on various contents of natural images.
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Submitted on : Monday, September 26, 2011 - 1:57:53 PM
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Eric van Reeth. Système avancé d'interpolation spatiale de signaux de télévision pour affichage sur écrans Haute-Définition. Autre. Université de Grenoble, 2011. Français. ⟨NNT : 2011GRENT017⟩. ⟨tel-00626504⟩

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