Optical scanner filter screen

Details Optical scanner filter screen Optical scanner filter screen

1990-07-09

1993-11-16

Moore, David K.

Image analysis

Histogram processing

For setting a threshold

382 65, 355 71, 354482, 359614, G06K 920, G06K 700, G03B 2772, G03B 7099

Patent

active

052631010

ABSTRACT:
An optical scanner filter screen for use with an optical scanner, and method for use, comprising a colored optical filter or optical glass placed between the scanning mechanism of the optical scanner and the document to be scanned, for improving the accuracy of the reproduction of the document resulting from the optical scan by increasing contrast and reducing reflection and distortion of the light read by the scanning mechanism.

REFERENCES:
patent: 3123804 (1964-03-01), Kamentsky
patent: 3395284 (1968-07-01), Smith
patent: 3976875 (1976-08-01), Engstrom et al.
patent: 4416530 (1983-11-01), Herbert et al.
patent: 4771473 (1988-09-01), Sugiura
patent: 4802745 (1989-02-01), Okada et al.
patent: 4803737 (1989-02-01), Sato et al.
patent: 4822147 (1989-04-01), Park
Oriel Corporation "Optics and Filters Catalogue vol. III" pp. 2-2.fwdarw.2-4.
Wilson, "Optical Page Reading Devices", Reinhold Publishing Corporation, (1966), pp. ix, and 47-50.
Chartpak advertisement.
Nemzow, Ventura Professional!(May 1990) pp. 20-26.
Beale et al., Ventura Professional!(May 1990) pp. 10-17.
Beale et al., The Scanner Book, Micro Publishing Press, Torrance, Calif., 1989, pp. 22-24.
Wilson, Optical Page Reading Devices, Reinhold Publishing Co., London, England, 196, p. 49.
Roth et al., Scanjet Unlimited, Peachpit Press Publishers, Berkeley, Calif., 1990, Chapter 1, pp. 1-24; Chapter 2, pp. 25-36; and Chapter 4, pp. 47-75.
Holsinger et al., Publish!(Mar. 1990) pp. 56-64.
Mendelson, PC Magazine (Dec. 26, 1989) p. 44.

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