Methods and apparatus for optically enhancing selected features

Details Methods and apparatus for optically enhancing selected features Methods and apparatus for optically enhancing selected features

1988-11-21

1990-05-22

Peng, John K.

Facsimile and static presentation processing

Facsimile

Recording apparatus

350334, 350337, H04N 566

Patent

active

049281810

ABSTRACT:
Input image features of predetermined brightness are enhanced in an output image by processing the input image using a liquid crystal display in conjunction with specially oriented light polarizing devices.

REFERENCES:
patent: 3930719 (1976-01-01), Madrid et al.
patent: 4459615 (1984-07-01), Mir
patent: 4653861 (1987-03-01), Keindo et al.
patent: 4743097 (1988-05-01), Johnson et al.
Hua-Kuang Liu et al., "On the Progress of the Liquid Crystal Television Spatial Light Modulator," Jet Propulsion Laboratory, Calif. Inst. Tech., Pasadena, CA 91109.
Tien-Hsin Chao et al., "Real Time Optical Edge Enhancement Using a Hughes Liquid Crystal Light Valve", J.P.L., Calif Inst. Tech., Pasadena, CA 91109.
D. Armitage et al., "Photoaddressed Liquid-Crystal Spatial Light Modulators", Research & Development Div., Lockheed Missiles & Space Co., 3251 Hanover Street, Palo Alto, Calif., 94304.
K. D. Hughes et al., "Optical Preprocessing Using Liquid Crystal Televisions", Applied Optics, vol. 26, No. 6, Mar. 15, 1987, pp. 1042-1044.

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