Communications: electrical – Digital comparator systems
Patent
1975-03-24
1977-01-11
Boudreau, Leo H.
Communications: electrical
Digital comparator systems
G06K 902
Patent
active
040030210
ABSTRACT:
Optical information on a card is read by an image sensor and then converted to a video signal represented by a digital signal of several bits through the use of an amplifier and an A - D converter. A reference level is determined by scanning a reference portion which is preferably provided along one edge of the card. The video signal is quantized by comparing with three sliced levels corresponding to 0.5, 0.75 and 0.85 times the reference level. The quantized information is applied to a recognition station.
REFERENCES:
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patent: 3202042 (1965-08-01), Jamieson et al.
patent: 3599151 (1971-08-01), Harr
patent: 3692982 (1972-09-01), McMillin
patent: 3800078 (1974-03-01), Cochran et al.
patent: 3872434 (1975-03-01), Duvall et al.
Simpson, "Optical Density Quantizer" IBM Tech. Disclosure Bulletin, vol. 5, No. 9, Feb., 1963, p. 71.
Frechette et al., "Detection Range Expansion of A CRT Scanner," IBM Tech. Disclosure Bulletin, vol. 13, No. 12, May, 1971, pp. 3626-3627.
Nagano Humikazu
Sasaki Hiromu
Yasuda Syoichi
Boudreau Leo H.
Sharp Kabushiki Kaisha
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