Illumination system for use in imaging moving articles

G - Physics – 06 – K

Patent

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Details

G06K 7/10 (2006.01)

Patent

CA 2403794

An apparatus and method for illuminating articles, such as parcels, moving beneath a camera (18) on a conveyor belt (12). Multiple light sources (200-201) are positioned alongside the conveyor to direct light angled downwardly and from the side of the conveyor. Each light source has an elongated lamp (40) angled with respect to the surface of the article and a light directing device, preferably a Fresnel lens, (45) positioned to receive light from the lamp and to direct the light toward the surface at an angle equal to or greater than forty degrees from an optical axis of the camera.

Appareil et procédé pour éclairer des articles tels que des colis qui se déplacent devant une caméra (18) sur une bande transporteuse (12). Des sources lumineuses multiples (200-201) sont placées le long de la bande transporteuse de manière à diriger la lumière sous un certain angle, vers le bas et depuis le côté de la bande transporteuse. Chaque source lumineuse comporte une lampe allongée (40) disposée sous un angle par rapport à la surface de l'article et un dispositif qui dirige la lumière, de préférence une lentille Fresnel (45), placée de manière à recevoir la lumière provenant de la lampe et la diriger vers la surface sous un angle égal ou supérieur à quarante degrés avec l'axe optique de la caméra.

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