Iterative calibration ommitting first corrections from a next iteration
AssigneeHewlett-Packard Indigo B.V.
InventorsTsafrir Yedid Am, Dmitry Iofe, Ran Waidman
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Abstract
In an example implementation, a method of iterative calibration includes, in a first iteration, measuring first values of a calibration parameter, and determining first corrections for the measured first values. The method includes, in a next iteration, measuring next values of the calibration parameter that incorporate the first corrections. The first corrections are omitted from the next iteration measurements to provide pseudo iteration measurements, and the first iteration measurements are averaged with the pseudo iteration measurements. Second corrections are then determined based on the averaging.
Claims20
A method of iterative calibration comprising:
- in a first iteration, measuring first values of a calibration parameter;
- determining first corrections for the measured first values;
- in a next iteration, measuring next values of the calibration parameter that incorporate the first corrections;
- omitting the first corrections from the next iteration measurements to provide pseudo iteration measurements;
- and
- averaging the first iteration measurements with the pseudo iteration measurements;
- and
- determining second corrections based on the averaging.
A printing device comprising:
- a print engine to iteratively print a pattern on a sheet in a color plane;
- a measurement module to determine a misregistration of the color plane;
- an iterative calibration module to determine a first correction based on misregistration from a first iteration, apply the first correction to the print engine for a second iteration, remove the first correction from a result of the second iteration, average the first and second iterations to determine a second correction, and apply the second correction to the print engine for a third iteration.
A non-transitory machine-readable storage medium storing instructions that when executed by a processor of a printing device, cause the printing device to:
- take a first color plane registration (CPR) measurement at a plurality of grid locations on a media page;
- determine a first correction constant for each grid location;
- adjust the printing device based on the first correction constants;
- take a second CPR measurement at the plurality of grid locations;
- remove the first correction constants from the second CPR measurement to determine a pseudo second CPR measurement;
- calculate an average of the first CPR measurement and the pseudo second CPR measurement;
- and
- determine a second correction constant for each grid location based on the average.
Dependencies are inferred from the claim text.