Facsimile and static presentation processing – Natural color facsimile – Scanning
Patent
1997-06-27
1999-10-26
Coles, Edward L.
Facsimile and static presentation processing
Natural color facsimile
Scanning
358501, 358504, 356402, H04N 146
Patent
active
059738006
ABSTRACT:
An illuminance spectrum I of reflected light from a color print of an N-order color having an arbitrary dot percent d.sub.1-N is defined by a diffuse reflection coefficient Sb(d.sub.1-N,.lambda.) and a specular reflection coefficient Ss(d.sub.1-N,.lambda.). These reflection coefficients are obtained in the following manner. A plurality of reference colors are specified on each of N.times.2.sup.(N-1) sides that constitute an N-dimensional color space including the N-order target color. Each reflection coefficient is expressed by a linear combination of a plurality of reference reflection coefficients Sb and Ss, which are set in advance for the plurality of reference colors. The illuminance spectrum of reflected light is then determined according to these reflection coefficients Sb and Ss. Color data representing the colors of the print in a colorimetric system suitable for an output device are subsequently generated from the illuminance spectrum.
REFERENCES:
patent: 4905039 (1990-02-01), Terashita
patent: 5272518 (1993-12-01), Vincent
patent: 5408447 (1995-04-01), Cottrell et al.
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patent: 5596425 (1997-01-01), Usui et al.
Balasubramanian, Raja, Institute of Electrical and Electronics Engineers, Proceedings of the International Conference on Image Processing (ICIP), "Colorimetric Modeling of Binary Color Printers," Washington, Oct. 23-26, 1995, vol. 2, Oct. 23, 1995, pp. 327-330.
Imamura Atsushi
Usui Nobuaki
Coles Edward L.
Dainippon Screen Manufacturing Co. Ltd.
Nguyen Madeleine A-V
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