Image analysis – Histogram processing – For setting a threshold
Patent
1980-10-17
1983-05-31
Boudreau, Leo H.
Image analysis
Histogram processing
For setting a threshold
382 33, 382 36, G06K 900
Patent
active
043864325
ABSTRACT:
This disclosure concerns currency identification systems for examining an authenticity characteristic of a detected currency and comparing it to an authenticity characteristic of a genuine currency to determine if the detected currency is genuine.
The systems comprises memory means for storing a series of first electrical signals representing the authenticity characteristic of the genuine currency, each of the first signals corresponding to a discrete successive area of the genuine currency and representing a component of a first authenticity vector, detecting means for scanning the detected currency and generating a series of second electrical signals representing the authenticity characteristic of the detected currency, each of the second signals corresponding to a discrete successive area of the detected currency and representing a component of a second authenticity vector, calculating means coupled to the detecting means and the memory means to calculate a value of similarity corresponding to an angle between the first authenticity vector and the second authenticity vector, and comparing means for comparing the value of similarity with a predetermined value which represents a permissable authenticity value for the detected currency corresponding to a genuine currency.
REFERENCES:
patent: 3688267 (1972-08-01), Iijima et al.
patent: 3727193 (1973-04-01), Bolie
patent: 3906446 (1975-09-01), Iijima et al.
patent: 4041456 (1977-08-01), Ott et al.
patent: 4179685 (1979-12-01), O'Maley
patent: 4319221 (1982-03-01), Sakoe
Izawa Kouji
Nakamura Yashushi
Ohtombe Ko
Boudreau Leo H.
Tokyo Shibaura Denki Kabushiki Kaisha
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