Adaptive and programmed threshold level detection arrangement

Details Adaptive and programmed threshold level detection arrangement Adaptive and programmed threshold level detection arrangement

1974-05-21

1976-03-16

Thesz, Jr., Joseph M.

Communications: electrical

Digital comparator systems

G06K 912

Patent

active

039449777

ABSTRACT:
A threshold level is automatically varied to follow variations in an input signal reference level. In the disclosed embodiment the reference level is that produced by photodiode-amplifiers in an OCR machine when viewing white or non-character portions of a page, the reference level varying as a function of the change in the length of the optical path during a scan across the page. The threshold level is compared to the input signal level to determine whether a character segment is viewed by the photodiode. Variation of the threshold level is achieved by low pass filtering individual output signals from some of the photodiode-amplifiers and then averaging the filtered signals to provide the adjusted threshold.

REFERENCES:
patent: 3701099 (1972-10-01), Hall et al.
patent: 3714397 (1973-01-01), Macey et al.
patent: 3747066 (1973-07-01), Vernot et al.
patent: 3778768 (1973-12-01), Brisk et al.

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