Printer nonuniformity compensation for halftone screens
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United States of America Patent
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May 12, 2015
Grant Date -
Oct 25, 2012
app pub date -
Jun 22, 2011
filing date -
Oct 12, 2009
priority date (Note) -
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Abstract
Compensation is performed for nonuniformity in a printer. The printer has a photoreceptor and a print head with a plurality of different light sources, each light source capable of producing a plurality of different levels of light. A plurality of stored gain control signals for each light source are related to the light output of that light source. Print job data includes screened pixel levels and a halftone screen specification. The stored gain control signals are adjusted based on the halftone screen specification. The screened pixel levels are modified using the adjusted gain control signals to provide engine pixel levels. Those levels are provided to corresponding light sources to expose the photoreceptor in respective pixel areas with light corresponding to the compensated pixel levels.
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