A method for calculating gain correction factors in a...

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G01T 1/16 (2006.01) G06T 5/00 (2006.01) H04N 5/217 (2006.01) H04N 5/325 (2006.01)

Patent

CA 2367824

A method for developing a set of gain correction coefficients corrected for structural noise to be used in correcting the digital values representing an image captured by a pixilated detector having a plurality of individual sensors. The gain correction coefficients are developed by first obtaining a first set gain correction coefficients (30) using a flat exposure (20) and adjusting the individual sensor gain output so that all sensors produce the same output value, and then applying a smoothing filter (40) to the first set of gain correction coefficients to obtain a new set of corrected gain correction coefficients.

L'invention concerne un procédé destiné à mettre au point un ensemble de coefficients de correction du gain corrigés pour un bruit structurel et destinés à être utilisés pour corriger des valeurs numériques représentant une image capturée par un détecteur pixelisé équipé de plusieurs capteurs individuels. Les coefficients de correction du gain sont mis au point, premièrement, par l'acquisition d'un premier ensemble de coefficients de correction du gain (30) au moyen d'une exposition plate (20), puis par le réglage de la sortie du gain de chaque capteur individuel afin que tous les capteurs produisent la même valeur de sortie; deuxièmement, par l'utilisation d'un filtre de lissage (40) avec les coefficients de correction du gain en vue d'obtenir un nouvel ensemble de coefficients de correction du gain corrigés.

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