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, agrandissement par induction peutêtrepeutêtre vu comme une méthode d'extrapolation implicite de coefficients d'ondelettes, ceux-cí etant extraits d'une image agrandie par une méthode d'agrandissement inductrice. On demande avant toutàtoutà cettedernì ere d'effectuer un traitement satisfaisant des contours, avec un rendu franc et sans crénelage
, On peut faire les remarques suivantes sur l'information apportée par l'image inductrice : ? Si l'image inductrice est uniforme (par exemplecompì etement noire)
, le procédé d'induction devientcompì etement linéaire, et l'image induite vaut alors y ? = [v] ? ? * h ? , pour un certain filtre y ? combinaison de h et h 0 . 7. Agrandissement d'images par induction Fig
, Agrandissement (? = 4, ? = [0, 0]) par induction. 7. Agrandissement d'images par induction`A induction` induction`A la vue des images précédentes
, La méthode de Jensen présente des contours nets, mais souffre d'un effet de flou important ailleurs, dûdûà la disparition des petits détails (voir les yeux du personnage dans l'image 7.12) La méthode de Jensen produit ainsi des imagesàimagesà l'allure de peintures, avec un effet d'« ` a plat » (voir les images 7
, mais les différences sont effectivement peu visibles dans le cas d'un facteur 2, et ce quelles que soient les méthodes employées. Philips n'a pas choisi d'opter pour une diffusion de l'induction dans ses périphériques d'affichage grand public, malgré l'intérêt manifesté pour notre méthode. En effet, les facteurs d'agrandissement requis dépassent rarement 2, et une interpolation suivie d'un réhaussement
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