Optics: measuring and testing – By shade or color
Patent
1994-09-27
1996-09-24
McGraw, Vincent P.
Optics: measuring and testing
By shade or color
G01N 2127
Patent
active
055596045
ABSTRACT:
Colorimetric values such as L*a*b* values are transformed into color separation values such as CMYK values dependent on the characteristics of a color output device by using a multilayered feedforward neural network. The neural network learns in advance the relationships between a multiplicity of colorimetric values under different illuminants and color separation values. When colorimetric values of a standard illuminant and one of the color temperature of an observational illuminant, the spectral distribution of the observational illuminant, and colorimetric values at the time of illumination by the observational illuminant are inputted to the neural network, color separation values corresponding to one of the color temperature of the observational illuminant, the spectral distribution of the observational illuminant, and the colorimetric values obtained when illumination is provided by the observational illuminant are outputted. Consequently, colorimetric values are transformed into color separation values such that the color reproduced under the observational illuminant will visually assume the same color as that under the standard illuminant.
REFERENCES:
patent: 4275413 (1981-06-01), Sakamoto et al.
patent: 5175697 (1992-12-01), Kawagoe et al.
patent: 5185850 (1993-02-01), Usui et al.
Coppock et al. "Color Technology and its Applications in Industry" Published Feb. 1970 by Diano Corporation.
Arai et al.; "A Method of Transformation from CIE Lab to CMY Value by a Three-Layered Neural Network"; IS&T and SID's Color Imaging Conference: Transforms & Transportability of Color; 1993, vol. J76-D-II, No. 5, pp. 967-975 (original Japanese version).
Arai et al.; "A Method of Transformation fro CIE Lab to CMY Value by a Three-Layered Neural Network"; IS&T and SID's Color Imaging Conference: Transforms & Transportability of Color; 1993, pp. 41-44 (Eng. translation with slight variations from the original Japanese version.
McGraw Vincent P.
Toyo Ink Manufacturing Co. Ltd.
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