Adaptive non-uniformity compensation algorithm

G - Physics – 06 – T

Patent

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G06T 5/20 (2006.01) G06T 5/50 (2006.01) H04N 5/33 (2006.01) H04N 5/217 (2006.01)

Patent

CA 2254143

An adaptive method for removing fixed pattern noise from focal plane array (FPA) imagery. A set of correction terms (26) is applied to the focused image from the FPA, and a filter (24C) is applied to the corrected, focused image. The set of correction terms is also applied to a blurred version of the FPA image, and the filter is applied to the corrected, blurred image. Fixed pattern noise errors are then calculated using the filtered imagery, and employed to update the correction terms. The updated correction terms are then used for processing the next image. In one embodiment, the filter is an anti-median filter. In another embodiment, the filter is an anti-mean filter.

Ce procédé adaptatif, destiné à enlever un bruit stable à partir d'images de cible focale, consiste à appliquer un ensemble facteurs de correction (26) à l'image focalisée, à partir de la cible focale et à appliquer un filtre (24C) à l'image corrigée et focalisée. On peut également appliquer l'ensemble facteurs de correction à une version floue de l'image de cible focale et appliquer le filtre à l'image corrigée et floue. Le procédé consiste ensuite à calculer les erreurs de bruit stable au moyen des images filtrées, à utiliser ces erreurs pour mettre à jour les facteurs de correction, puis à employer ces facteurs mis à jour pour traiter l'image suivante. Dans un mode de réalisation, le filtre est un filtre anti-médian, et dans un autre mode de réalisation, le filtre est un filtre anti-moyenne.

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