Image analysis – Histogram processing – For setting a threshold
Patent
1988-12-21
1991-03-26
Boudreau, Leo H.
Image analysis
Histogram processing
For setting a threshold
382 61, 358 80, G06K 714
Patent
active
050036130
ABSTRACT:
A document processing system for processing documents having data printed thereon including pre-printed markings visible to the eye and machine-readable characters includes a scanner for capturing the color image of the document being processed. Circuitry is provided for reducing the contract between the pre-printed marking and the background surrounding a machine-readable character based upon the hue of the pre-printed markings, such that the pre-printed markings and the background surrounding a character are not distinguishable with respect to light reflected from the document thereby generating a filtered image of the document. An optical character recognition device receives the filtered image of the document representing character information only for identifying the characters appearing on the document.
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Lovelady Kenneth T.
Sanner Medford D.
Boudreau Leo H.
Dinh Tan
Recognition Equipment Incorporated
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