Image analysis – Histogram processing – For setting a threshold
Patent
1981-12-11
1985-01-08
Boudreau, Leo H.
Image analysis
Histogram processing
For setting a threshold
178 18, 382 59, G06K 928
Patent
active
044931042
ABSTRACT:
This invention is concerned with a character recognition device which includes a writing pad having a pair of sheets with one of the sheets comprising an area of high resistivity and the other one of the sheets comprising a layer of conductive material, the sheets being normally electrically insulated from one another but adapted to be brought into contact with one another by application of writing pressure by a writing implement upon the writing pad, the sheets being adapted to be connected to an electrical switching circuit whereby current is caused to flow through the pad along two alternate paths, wherein the high resistivity and the conductive sheet are separated by a layer of reticulated material and the conductive material is sufficiently elastomeric to provide good continuous electrical contact between the sheets when writing pressure is applied.
REFERENCES:
patent: 3624619 (1971-11-01), Ambrosio
patent: 3911215 (1975-10-01), Hurst et al.
patent: 4054540 (1977-10-01), Michalchik
patent: 4079194 (1978-03-01), Kley
patent: 4262281 (1981-04-01), Buckle et al.
patent: 4455450 (1984-06-01), Margolin
Duhig Gerard P.
Lukis Lawrence J.
Boudreau Leo H.
Moore Business Forms Inc.
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