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US 2012/0075370 A1Published application
System And Method To Compensate For An Inoperative Inkjet In An Inkjet Printer
AssigneeXerox Corporation
InventorsBhaskar T. Ramakrishnan, Brent E. Fleming, Joel Chan
Life of this patent
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Abstract
An inkjet printer has been developed, which identifies one or more printing metrics and selects a corrective operation for image data. After application of the corrective operation to image data, firing signals are generated with reference to the modified image data to compensate for an inoperative inkjet in a printhead of the inkjet printer.
Claims20
A printer comprising:
- an image processor configured to identify at least one pixel in image data that corresponds to an inoperative inkjet in a printhead, to identify at least one metric for a portion of the image data that corresponds to one or more inkjets positioned to compensate for the inoperative inkjet, to select a corrective operation from a plurality of corrective operations in response to the at least one metric being greater than a predetermined threshold, and to apply the selected corrective operation to the image data;
- and
- a controller configured to generate firing signals to operate the one or more inkjets positioned to compensate for the inoperative inkjet with reference to the image data to which the image processor has applied the selected corrective operation.
A method for operating an inkjet printer comprising:
- identifying at least one pixel in image data that corresponds to an inoperative inkjet in a printhead;
- identifying at least one metric for a portion of the image data that corresponds to one or more inkjets positioned to compensate for the inoperative inkjet;
- selecting a corrective operation from a plurality of corrective operations in response to the at least one metric being greater than a predetermined threshold;
- applying the selected corrective operation to the image data;
- and
- generating firing signals to operate the one or more inkjets positioned to compensate for the inoperative inkjet with reference to the image data to which the selected corrective operation has been applied.
3 more elements
A method for operating an inkjet printer comprising:
- identifying at least one black pixel in image data that corresponds to an inoperative inkjet in a printhead;
- identifying at least one metric for a portion of the image data that corresponds to two or more inkjets positioned to compensate for the inoperative inkjet;
- generating a cyan pixel and a magenta pixel that are positioned to produce a composite ink drop in response to the at least one metric being greater than a predetermined threshold;
- storing the cyan pixel and the magenta pixel to a memory in which the image data are stored;
- and
- generating firing signals to operate an inkjet ejecting cyan ink and an inkjet ejecting magenta ink to produce the composite ink drop at a location on the image receiving member corresponding to a position for an ink drop corresponding to the at least one identified black pixel.
3 more elements
Dependencies are inferred from the claim text.