Density-dependent sharpening

H - Electricity – 04 – N

Patent

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H04N 1/409 (2006.01)

Patent

CA 2583416

A sharpening filter is disclosed for performing density-dependent sharpening on digital images. In one embodiment, a digital image to be sharpened is decomposed into a plurality of high-pass versions of the image at different resolutions. These high-pass images are gained at each resolution and recombined with the original image to produce a sharpened version of the image. The gains that are applied at each resolution are density-dependent. As a result, the effects of density~dependent blurring are counteracted, such that the sharpness of the final printed image is independent of the print density. Techniques are disclosed for performing such density-dependent sharpening with a high degree of computational efficiency.

L'invention concerne un filtre d'affinage permettant d'affiner des images numériques en fonction d'une densité. Dans un mode de réalisation, une image numérique à affiner est décomposée en une pluralité de versions d'image passe-haut à des résolutions différentes. Ces images passe-haut sont acquises au niveau de chaque résolution et recombinées avec l'image originale afin de produire une version affinée de l'image. Les gains qui ont appliqués au niveau de chaque résolution dépendent de la densité. En conséquence, les effets de flou dépendant de la densité sont contrecarrés de sorte que l'affinage de l'image imprimée finale est indépendant de la densité d'impression. L'invention concerne également des techniques permettant d'effectuer un affinage dépendant de la densité avec un degré d'efficacité de calcul élevé.

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