Facsimile and static presentation processing – Natural color facsimile
Patent
1995-02-23
1997-01-21
Coles, Sr., Edward L.
Facsimile and static presentation processing
Natural color facsimile
358501, 358509, 358527, H04N 146, G03B 310
Patent
active
055964257
ABSTRACT:
There is provided a model where the illuminance of reflected light from the print is expressed with a linear combination of the illuminance of specular reflection light and that of internal reflection light. On the basis of the model, three methods are applicable to compute the colors of a print disposed in the three-dimensional space. In the first method, a specular reflection coefficient and an internal reflection coefficient, which are depending upon the wavelength, are interpolated by an angle of reflection .theta. and an angle of deviation .rho., and the illuminance spectrum of the reflected light is subsequently determined (step S2). Tristimulus values X, Y, and Z are then determined by integration of the illuminance spectrum according to the color matching functions (step S3). In the second method, the tristimulus values are determined for the specular reflection light, the internal reflection light, and the environmental light, respectively, and then interpolated by the reflection angle .theta. and the deviation angle .rho. (step S4). In the third method, the chromaticity coordinates are determined respectively for the specular reflection light, the internal reflection light, and the environmental light, and then interpolated by the reflection angle .theta. and the deviation angle .rho. (step S5).
REFERENCES:
patent: 4905039 (1990-02-01), Terashita
patent: 5408447 (1995-04-01), Cottrell et al.
Transactions of Information Processing Society of Japan, "Realistic Production of Object Color in a Three-Dimensional Space and Its Evaluation", vol. 34, No. 2, pp. 289-301.
Transactions of Information Processing Society of Japan, vol. 33, No. 1, pp. 37-45.
Fujimoto Hiroki
Imamura Atsushi
Taniguchi Kazutaka
Usui Nobuaki
Coles Sr. Edward L.
Dainippon Screen Manufacturing Co. Ltd.
Grant II Jerome
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