A method and apparatus for re-sizing and cropping images by...

G - Physics – 06 – T

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G06T 3/40 (2006.01)

Patent

CA 2347364

Digital images are represented in the spatial domain by numbers that correspond to pixels and may be transformed to a transform domain image by means of a Transform Method. Other Transform Methods are used to transform the transform domain image back to the original spatial domain image. In this invention, these other Transform Methods are modified in such a way that the Modified Transform Method yields spatial domain images that are re-sized versions of the original spatial domain image. Methods are disclosed for employing the Modified Transform Method to implement zoomed and panned versions of the re-sized images. The re-sized images do not require pixel- level smoothing filters and other methods for removing image distortions due to re-sizing.

Les images numériques sont représentées dans le domaine spatial par des numéros qui correspondent à des pixels, et on peut les transformer en images de domaine de transformation par le biais d'une méthode de transformation. Ensuite, d'autres méthodes de transformation permettent de transformer l'image de domaine de transformation en retour, pour revenir à l'image du domaine spatial original. Aux fins de l'invention, on modifie ces autres méthodes de transformation, pour que la méthode modifiée donne une image de domaine spatial constituant une version reformatée de l'image du domaine spatial original. L'invention concerne des procédés relatifs à l'utilisation de cette méthode de transformation modifiée, pour obtenir des versions d'image reformatée intégrant les effets de zoom et de panoramique. Les images reformatées n'exigent pas que l'on utilise des filtres pour le lissage du niveau des pixels, et autres moyens visant à éliminer dans les images les distorsions dues au reformatage.

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