Method and apparatus for calibration of color values

Details Method and apparatus for calibration of color values Method and apparatus for calibration of color values

1994-06-17

1996-01-02

Coles, Sr., Edward L.

Facsimile and static presentation processing

Natural color facsimile

Measuring, testing, and calibrating

358523, 358518, H04N 146

Patent

active

054813808

ABSTRACT:
The invention is directed to a method and to an apparatus for the calibration of color values in color conversion in apparatus and systems for image processing. Measured color values of an apparatus-dependent input color space are acquired by scanning a suitable test original with a plurality of color fields in an image input apparatus. The measured color values are transformed into color values of an apparatus-independent communication color space in an input color converter on the basis of an analytically approximately calculated conversion table. The approximate calculation of the conversion table occurs taking the pre-distortion of the measured color values and the spectral properties of the respective input apparatus into consideration. The transformed color values are compared to the colorimetrically defined color values of the test originals that are measured, for example, with a spectral photometer. Correction color values for the three-dimensional conversion table of the input color converter are calculated from the color value differences, the calculations being on the basis of an error compensating calculation.

REFERENCES:
patent: 5267030 (1993-11-01), Giorgianni et al.
patent: 5309256 (1994-05-01), Takada et al.
patent: 5345315 (1994-09-01), Shalit
patent: 5416613 (1995-05-01), Rolleston et al.

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