Programmable sensor aperture

Details Programmable sensor aperture Programmable sensor aperture

1987-02-11

1991-06-11

Razavi, Michael

Image analysis

Histogram processing

For setting a threshold

235474, 382 63, G06K 920

Patent

active

050239236

ABSTRACT:
A document to be verified or tested as a possible counterfeit is scanned by a system that optically senses a specific target area or aperture on the document. This area may include material deposited on the document or may be simply the document material. A reference grid is imprinted on the document to locate the same target area to be sensed each time the document is scanned, independent of the transport used to do the scanning. The reference grid is used to locate the target area both vertically and horizontally and signals sensed from the target area are combined to a representative composite.

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