Signal processing for print scanners

Details Signal processing for print scanners Signal processing for print scanners

1976-01-29

1977-04-26

Smith, Alfred E.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250206, 235 6111E, G06K 710

Patent

active

040203573

ABSTRACT:
Laser light scattered from a UPC symbol on a moving web is detected by a photomultiplier, and detection threshold levels and print contrast signals are developed on a time varying analog basis. Since the reflected light includes an ambient component, the "white" and "dark" logical thresholds are developed based on the voltage levels of peak above zero, white to dark as a time variant function, and respective maximum values thereof. When a valid UPC signal is detected, present signal parameters develop print contrast (i.e., white minus dark/white) and produce a gate pulse having a duration proportional to that ratio.

REFERENCES:
patent: 3400368 (1968-09-01), Le May
patent: 3593284 (1971-07-01), Frank et al.
patent: 3593285 (1971-07-01), Gillmann
patent: 3723970 (1973-03-01), Stoller
patent: 3899687 (1975-08-01), Jones

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