Method and system for enhancing digital images

G - Physics – 06 – T

Patent

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G06T 5/00 (2006.01)

Patent

CA 2629187

A system and method for enhancing digital images is described. A digital image is transformed into a series of decomposed images in frequency bands, or different resolution grids A decomposed image is noise suppressed and contrast enhanced Representative value of signal at each pixel is computed based on contributions to signals from pixels in a neighborhood of the pixel. Lookup tables are applied to pixel values to selectively enhance signal in a predetermined range of signal strength. Another set of lookup tables are applied to pixel values to suppress noise components contained therein Optionally, operations are applied to decomposed images to suppress quantum noise, enhance object edges or enhance global contrast, among others These decomposed images, after signal enhancement and noise suppression, are then recombined to result in an enhanced image

L'invention porte sur un système et un procédé qui permettent d'améliorer les images numériques. Selon l'invention, on transforme une image numérique en une série d'images décomposées en bandes de fréquence, ou en grilles de résolutions différentes. On supprime le bruit et on améliore le contraste de l'image décomposée.On calcule une valeur représentative du signal de chaque pixel sur la base de la contribution au signal des pixels au voisinage du pixel. On applique des tables de conversion aux valeurs des pixels afin d'améliorer sélectivement le signal dans une plage prédéterminée d'intensités du signal. On applique un autre ensemble de tables de conversion aux valeurs des pixels afin de supprimer les composantes de bruit contenues dans ces valeurs. Facultativement, on applique des opérations aux images décomposées afin de supprimer le bruit quantique, d'améliorer les contours des objets ou le contraste global, entre autres. On recombine alors ces images décomposées, après l'amélioration du signal et la suppression du bruit, afin d'obtenir une image améliorée.

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