Dark-current compensation circuit

Details Dark-current compensation circuit Dark-current compensation circuit

H - Electricity

04

N

H04N 5/217 (2006.01) H04N 5/335 (2006.01)

Patent

CA 2355596

An imaging device includes a compensation circuit for reducing an effect of dark current generated during operation. The compensation circuit calculates an initial dark current offset value using optically dark regions of a photo sensitive array. The compensation circuit also automatically adjusts the initial dark current offset value as output signals from successive rows of the photo sensitive array are transferred. The compensation circuit can calculate the initial dark current offset value each time an image is captured, thereby compensating for variables such as temperature.

L'invention porte sur un dispositif d'imagerie comprenant un circuit de compensation réduisant l'effets du courant d'obscurité produit pendant le fonctionnement en calculant une valeur initiale de décalage du courant d'obscurité en utilisant les zones optiquement sombres d'un réseau photosensible. Par ailleurs, le circuit de compensation règle automatiquement la valeur initiale de décalage du courant d'obscurité lors du transfert des signaux sortant des rangées successives du réseau photosensible; il peut également calculer la valeur initiale de décalage du courant d'obscurité à chaque saisie d'image, compensant ainsi des variables telles que la température.

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