Systems and methods for increasing or optimizing the optical contrast response of multiple colors
AssigneeXerox Corporation
InventorsKenneth Russell Ossman, R. Enrique Viturro
Life of this patent
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Abstract
Methods and systems are provided to increase or optimize the illumination used with a sensor to measure printed ink colors on a substrate at high speed (up to 3 m/s) and high resolution. By modifying the number of light sources, their wavelengths and/or their relative intensities, the optical contrast can be increased or optimized to yield a higher signal-to-noise ratio and improved accuracy for the measurement of multiple colors. In one implementation, multiple LEDs with selected output peak wavelength may be used to achieve higher contrast imaging for each color.
Claims22
A method for increasing the optical contrast for printed color relative to a background substrate comprising:
- providing an illuminator comprising at least one light source;
- determining a color to be printed;
- and
- selectively controlling the at least one light source to produce a spectral output that increases the optical contrast of printed color relative to the background substrate when measuring the printed color.
A system for increasing the optical contrast for printed color relative to a background comprising:
- an illuminator comprising at least one light source;
- a color measuring device;
- and
- a controller for selectively controlling the at least one light source so as produce a spectral output response that increases the optical contrast of the printed color relative to the background substrate when measured.
A method for increasing the contrast for a spectral measurement relative to a background comprising:
- providing an illuminator comprising at least one light source;
- and
- selectively controlling the at least one light source to produce a spectral output that increases the optical contrast of each spectral measurement relative to the background when making the spectral measurement.
Dependencies are inferred from the claim text.