Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1988-11-16
1990-02-13
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250560, G01V 904
Patent
active
049009150
ABSTRACT:
A method of counting, in real time, articles supplied on a conveyor track in a random pattern is disclosed. The method comprises forming an image of the articles present in a counting zone by means of an image pick-up device, which counting zone corresponds to a periodic, elongated image of the image pick-up device, which image extends essentially transversely to the direction of movement of the conveyor track. The elongated image is converted into a binary image composed of a row of image elements, each with its own grey value, which binary image is obtained by assigning a first logic state to image elements having a grey value above a pre-determined threshold value and a second logic state to image elements below this threshold value. The invention is characterized by determining whether an article arrived in the counting zone, whether the article subsequently reaches a minimum width in the image, and whether the article leaves the counting zone again, whereby a count signal is produced when the article leaves the counting zone.
REFERENCES:
patent: 4490617 (1984-12-01), Loose
patent: 4589079 (1986-05-01), Peter
de Hoog Johannes H.
Deen Andre
Wever Peter J.
Heineken Technisch Beheer B.V.
Nelms David C.
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