Facsimile and static presentation processing – Facsimile – Picture signal generator
Patent
1992-12-14
1994-01-11
Coles, Sr., Edward L.
Facsimile and static presentation processing
Facsimile
Picture signal generator
358474, H04N 104
Patent
active
052786749
ABSTRACT:
A document scanner is disclosed wherein means are provided to dynamically compensate for any changes in document illumination intensity that may occur as a document is scanned. The compensation method and apparatus operates to measure the intensity of light that is reflected from a target area that borders an edge of the document being scanned. The target area is a narrow, elongated, area that extends in the scan direction. The target area is of a color to approximate the document's background area, i.e. the document's nonimage area. Since the target area is of a continuous and uniform color tone, any variation in the quantity of light that is reflected from the target area is caused by a variation in the intensity of illumination thereof by the scanning light source. The method and apparatus of the invention controls the scanning light source so as to maintain the light reflected from the target area at a substantially constant magnitude.
REFERENCES:
patent: 4408231 (1983-10-01), Bushaw et al.
patent: 4491961 (1985-01-01), Sutton et al.
patent: 4554583 (1985-11-01), Saitoh et al.
patent: 4803556 (1989-02-01), Beikirch
European Search Report, Application Number EP 91 30 0557, 2 pages.
Beeman Edward S.
Gennetten Kenneth D.
Miller Craig L.
Webb Steven L.
Coles Sr. Edward L.
Hewlett--Packard Company
Stoll Thomas L.
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