Automatic detection and selection of a drop-out color using zone

Details Automatic detection and selection of a drop-out color using zone Automatic detection and selection of a drop-out color using zone

1990-07-24

1991-05-07

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

358 78, G06K 900, H04N 146

Patent

active

050143298

ABSTRACT:
A method and apparatus for separating text information from previously printed material on forms by automatically detecting and selecting the drop-out color based on sampling a color from a selected calibration zone or patch. Using a three-color electronic scanner, the filtering parameters are adjusted based on the detected color in the zone of the form being processed.

REFERENCES:
patent: Re29104 (1977-01-01), Shepard
patent: 4368482 (1983-01-01), Machida et al.
patent: 4454532 (1984-06-01), Itani et al.
patent: 4647961 (1987-03-01), Kammoto et al.
patent: 4656665 (1987-04-01), Pennebaker
patent: 4873570 (1989-10-01), Suzuki et al.

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