Level determination for optical character reader

Details Level determination for optical character reader Level determination for optical character reader

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:
patent: 3159815 (1964-12-01), Groce
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.

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