Facsimile and static presentation processing – Natural color facsimile – Measuring – testing – and calibrating
Patent
1991-10-02
1994-05-03
Coles, Sr., Edward L.
Facsimile and static presentation processing
Natural color facsimile
Measuring, testing, and calibrating
358518, H04N 146, G03F 308
Patent
active
053092562
ABSTRACT:
Disclosed herein are a method of and an apparatus for electrically processing an image, and a calibration chart used in the apparatus. This method comprises a first process for measuring respective spectral densities of a calibration chart having at least three regions at which respective ones of three primary color dyes in a color photosensitive material are developed, a second process for determining data indicative of the quantity of the three primary color dyes in the regions from the spectral densities obtained in the first process, a third process for determining color calibration data from density data of the regions, the density data being obtained by reading the calibration chart with an image reading apparatus, and the data indicative of the quantity of the primary color dyes in the regions, the data being obtained in the second process, and a fourth process for correcting density data obtained by reading an original having the same color development characteristic as that of the calibration chart with the image reading apparatus, by making use of the color correction data obtained in the third process. In addition, the apparatus comprises a dye-quantity data storage unit, an original reading unit, a color calibration data arithmetic unit, a color calibration data storage unit and a calibration density data arithmetic unit.
REFERENCES:
patent: 4717954 (1988-01-01), Fujita et al.
patent: 4839722 (1989-06-01), Barry et al.
Miyakawa Tadashi
Takada Yoko
Coles Sr. Edward L.
Fuji Photo Film Co. , Ltd.
Rogers Scott A.
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