System and method for adaptive non-uniformity compensation...

H - Electricity – 04 – N

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H04N 5/365 (2011.01) G06T 5/20 (2006.01)

Patent

CA 2659847

A method of reducing an amount of fixed pattern noise from an image signal generated by an image sensor (12). The method includes, for each operational pixel in the image signal, applying a recursively updated offset term to generate a corrected image signal. The offset correction terms are recursively updated by spatially filtering the corrected image signal for a current frame of the image signal; comparing the filtered corrected image signal of the current frame with a spatially filtered corrected image signal of a preceding frame of the image signal; and updating the offset correction terms with terms generated as a function of the comparison.

L'invention concerne un procédé permettant de réduire le bruit à motif fixe d'un signal d'image produit par un capteur d'image (12). Ce procédé comprend, pour chaque pixel fonctionnel du signal d'image, l'application d'un terme de décalage actualisé de manière récurrente pour la production d'un signal d'image corrigé. Les termes de correction de décalage sont actualisés de manière récurrente par filtrage spatial du signal d'image corrigé pour une trame actuelle du signal d'image, comparaison du signal d'image corrigé et filtré de la trame actuelle à un signal d'image corrigé et soumis à un filtrage spatial d'une trame précédente du signal d'image et actualisation des termes de correction de décalage avec des termes produits en fonction de la comparaison.

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