Scanner calibration and correction techniques using scaled light

Details Scanner calibration and correction techniques using scaled light Scanner calibration and correction techniques using scaled light

1997-08-29

1999-12-21

Grant, II, Jerome

Image analysis

Color image processing

358522, 358523, G06K 900

Patent

active

060059680

ABSTRACT:
A technique for calibrating a scanner wherein once the scanner is calibrated, the scanner's device-dependent tristimulus values (e.g., RGB) for an arbitrary color are transformed to a device-independent representation (e.g., XYZ) of the arbitrary color in a computationally efficient manner. The scanner is characterized in a manner that a corrected device-independent representation of an arbitrary scanned color can be determined on the basis of a pair of chromaticity coordinates in a chromaticity space having (i) a pair of chromaticity coordinates that span hue and chroma (saturation), and (ii) a lightness coordinate that is a luminance correlate (monotonic function of luminance). A look-up table stores XYZ values and a lightness value. A set of XYZ values and a lightness value are retrieved from the table as addressed by a pair of chromaticity values corresponding to the scanned value. The XYZ values from the table are then scaled by the ratio of the scanned lightness value to the lightness value from the table to provide the XYZ values for the arbitrary color.

REFERENCES:
patent: 3986202 (1976-10-01), Granger
patent: 4843573 (1989-06-01), Taylor et al.
patent: 4929978 (1990-05-01), Kanamori et al.
patent: 5231504 (1993-07-01), Magee
patent: 5243414 (1993-09-01), Dalrymple et al.
patent: 5309257 (1994-05-01), Bonino et al.
patent: 5313291 (1994-05-01), Appel et al.
patent: 5317425 (1994-05-01), Spence et al.
patent: 5323249 (1994-06-01), Liang
patent: 5450216 (1995-09-01), Kasson
patent: 5463480 (1995-10-01), MacDonald et al.
patent: 5650942 (1997-07-01), Granger
Granger, E.M. et al., "Visual Chromaticity Transfer Functions," 1973 Annual Meeting, Optical Society of America, (Abstract) pp. 1287-88 (Color II, Contributed Papers (C.J. Bartleson, Presider)).
Granger, E.M., "Subjective Assessment and Specification of Color Image Quality," Image Assessment Spec. Opt. Soc. Am. 1974, pp. 86-92.
Granger, Edward M., "A Summary Measure of Image Quality," SPIE vol. 432 (1983), pp. 340-347.
Granger, Edward M., "Visual Limits to Image Quality," SPIE vol. 528, Digital Image Processing (1985), pp. 95-102.
Granger, E.M., "Uniform Color Space as a Function of Spatial Frequency," SPIE vol. 1913 (1993), pp. 449-461.
Granger, E.M., "Is CIE L*a*b* Good Enough for Desktop Publishing?" SPIE vol. 2170, Device-Independent Color Imaging, pp. 144-148 (Eric Walowit, Chair/Editor; Feb. 7-8, 1994, San Jose, CA).
Granger, E.M., "ATD, Appearance Equivalence, and Desktop Publishing," SPIE vol. 2170, Device-Independent Color Imaging, pp. 163-168 (Eric Walowit, Chair/Editor; Feb. 7-8, 1994, San Jose, CA).
Granger, E.M., "A Constant-Bandwidth Grating-Lens Spectrometer," SPIE vol. 2413, Color Hard Copy and Graphic Arts IV, pp. 333-338 (Jan Bares, Chair/Editor; Feb. 6-10, 1995, San Jose, CA).
Granger, E.M., "Gamut Mapping for Hard Copy Using the ATD Color Space," SPIE vol. 2414, Device-Independent Color Imaging II, pp. 27-35 (Eric Walowit, Chair/Editor; Feb. 7-8, 1995, San Jose, CA).
Benzschawel et al., "ATD: Toward a Uniform Color Space," Color Research & Appl., vol. 9, No. 3, pp. 133-140.

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