Method and system for correcting spectrophotometer differences

Details Method and system for correcting spectrophotometer differences Method and system for correcting spectrophotometer differences

2011-07-19

2011-07-19

Evans, F. L (Department: 2877)

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrophotometer

C356S072000, C702S104000, C358S504000

Reexamination Certificate

active

07982873

ABSTRACT:
A method and system are provided to correct differences among multiple spectrophotometers. In one form, one spectrophotometer of a plurality that may be present in an image rendering system is treated as “primary”. Additional spectrophotometers are treated as “secondary”. The spectrum of a color from a secondary spectrophotometer is transformed by a linear transformation to an adjusted spectrum, which then is converted to L*a*b* (if desired) using standard techniques. The L*a*b* thus produced is, on average, substantially closer to the L*a*b* that the primary spectrophotometer would have produced when measuring the same color than it is to the L*a*b* that the secondary spectrophotometer would have produced without any correction. The linear transformation is generated by linear regression to minimize the spectral error, followed by non-linear optimization to minimize the error relative to a color difference metric—such as DeltaE 2000.

REFERENCES:
patent: 6384918 (2002-05-01), Hubble, III et al.
patent: 7069164 (2006-06-01), Viturro et al.
Mohammadi et al., “Diagnosing and Correcting Systematic Errors in Spectral-Based Digital Imaging,” 13thColor Imaging Conference Final Program and Proceedings (Scottsdale, AZ), Society for Imaging Science and Technology & Society for Information Display, pp. 25-30, (Nov. 2005).
Rich et al., “Improved model for improving inter-instrument agreement of spectrocolorimeters,”Analytical Chemica Acta, 380, 263-276, (1999).
Rich, “Graphical technology—Improving the inter-instrument agreement of spectrocolorimeters,” Committee for Graphic Arts Technologies Standard White Paper, pp. 1-27, Reston, Virginia (Jan. 2004).
Berns et al., “Empirical Modeling of Systematic Spectrophotometric Errors,”Color Research and Application, vol. 13, No. 4, pp. 243-258, (Aug. 1988).

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