Compact spectral readers for precise color determination

Details Compact spectral readers for precise color determination Compact spectral readers for precise color determination

2004-11-09

2008-10-28

Evans, F. L. (Department: 2877)

Optics: measuring and testing

By shade or color

C356S407000, C356S420000, C250S226000

Reexamination Certificate

active

07443506

ABSTRACT:
Systems and methods for providing spectral measurements are described. In one embodiment, a spectral measuring device comprises at least one radiation source configured to provide N (N≧2) linearly independent illuxninant sources characterized by M (M≧N) wavelength channels in a predetermined wavelength range; a sensor unit including at least one sensor, configured to be in optical communication with the radiation sources and an object; a memory storing an illuminant characterization matrix including spectral characteristics of the N illuminant sources in the M wavelength channels; and a processor configured to provide spectral responses of the object in the M wavelength channels, based at least in part on the illuminant characterization matrix. The embodiments of the invention can be used to construct a new class of compact spectral measuring devices, such as handheld color measuring devices.

REFERENCES:
patent: 5963333 (1999-10-01), Walowit et al.

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