Sheet dimension measurement system

Details Sheet dimension measurement system Sheet dimension measurement system

G - Physics

01

B

G01B 11/04 (2006.01) G01B 11/02 (2006.01) G01B 11/03 (2006.01) H04N 7/18 (2006.01)

Patent

CA 2059128

With four CCD (charge coupled device) based cameras and flashing devices, each of which is installed with an angle against the optical axis of a camera, four corners of sheets being transferred line are photographed. Each of four corner detecting sections detects absolute coordinates of a corner based on differences in brightness of standstill picture of sheet corner taken by each camera. Then, based on the detected absolute coordinates of sheet corners, sheet dimensions computing section calculates lengths, widths and diagonal dimensions of sheets.

Les quatre coins de feuilles en cours de transfert sont photographiés au moyen de quatre appareils photo à analyseur à transfert de charge et quatre flashs orientés chacun avec un angle donné par rapport à l'axe optique d'un appareil photo. Chacune des quatre sections de détection de coin détecte les coordonnées absolues d'un coin en se basant sur les différences de luminosité des images fixes des coins des feuilles prises par les appareils photo. Puis, en utilisant les coordonnées absolues obtenues pour les coins des feuilles, une section de calcul des dimensions des feuilles calcule la longueur, la largeur et la diagonale des feuilles.

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