Method of discriminating between the front and back sides of pap

Details Method of discriminating between the front and back sides of pap Method of discriminating between the front and back sides of pap

1983-05-20

1985-12-10

McGraw, Vincent P.

Optics: measuring and testing

Document pattern analysis or verification

209534, 250556, 271 65, 356432, G06K 974

Patent

active

045575975

ABSTRACT:
Described is a method of discriminating between front and back sides of the paper sheet bearing different printed design on the front and back sides, the printed design being in dissymmetry both in the up and down direction and in the left and right direction. The amount of light transmitted through plural portions of the paper sheet is sensed for deriving pattern signals indicative of changes in the amount of transmitted light, said pattern signals being then compared to reference pattern signals stored in advance to permit discrimination between the upper and lower edges and between the front and back sides of the sheet.

REFERENCES:
patent: 3753617 (1973-08-01), Ehrat
patent: 4435834 (1984-03-01), Pauli et al.

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