Photosensor system and drive control method thereof

Details Photosensor system and drive control method thereof Photosensor system and drive control method thereof

H - Electricity

04

N

H04N 5/235 (2006.01) H04N 3/15 (2006.01)

Patent

CA 2356949

This invention reads image data of a subject by performing pre-reading operation while changing the image reading sensitivity at a plurality of stages immediately before the start of normal reading operation of a subject image, calculates the absolute difference value between adjacent pixels of lightness data of the read image data, and sets as an optimal reading sensitivity an image reading sensitivity having a maximum absolute difference value among calculated absolute difference values in a photosensor system having a photosensor array constituted by two-dimensionally arraying a plurality of photosensors, a driver circuit for supplying a drive signal to the photosensors, and a controller for controlling reading operation of a subject image and sensitivity setting.

Cette invention concerne un système de lecture de données image consistant à: effectuer une opération de pré-lecture en modifiant la sensibilité de lecture à plusieurs stades différents immédiatement avant d'entamer le processus de lecture normal de l'image; calculer la valeur différentielle absolue entre des pixels adjacents en ce qui concerne des données de luminosité pour l'image lue; et fixer comme sensibilité optimale de lectured'image une valeur différentielle absolue maximum prise parmi de telles valeurs calculées dans un système de photodétection comportant une batterie de photodétecteurs constituée par une pluralité de photodétecteurs à agencement bidimensionnel, un circuit d'attaque fournissant un signal de commande aux photodétecteurs, et une unité de commande qui pilote l'opération de lecture d'image et le réglage de sensibilité.

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