Currency paper verification and denomination device having a cle

Details Currency paper verification and denomination device having a cle Currency paper verification and denomination device having a cle

1994-01-18

1995-03-21

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

382 7, G06K 500

Patent

active

053998740

ABSTRACT:
A linear array of photodiode and phototransistor pairs are positioned on opposite sides of currency paper for denomination determination under reflected light and for verification determination under transmitted light. The focus of one of the photodiodes in each pair is precisely adjusted for the top surface of the currency paper. The focus of the other photodiode in each pair is slightly out of focus at the top surface. A phase diversity algorithm integrates the successive images from both photodiodes to form a clear image. A processor determines the presence or absence of the security feature and correspondingly provides visual or audible indication thereof. The processor contains stored information identifying currency denomination and a comparison is made at the time of verification to also determine the denomination of the proffered currency.

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"Phase Retrieval and Diversity in Adaptive Optics" Robt. Gonsalves Optical Engineering 1982 vol. 21 No. 5.

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