Patent ID: 8955937
Filing Date: 2015-02-17
Classification: B41J

Abstract:
1. A method for compensating for an inoperable inkjet in a printer comprising: identifying a plurality of activated pixels in image data corresponding to the inoperable inkjet in a first printhead in the printer; identifying an image density of activated pixels in a first region of the image data that includes at least one activated pixel corresponding to the inoperable inkjet, the first region of the image data having a length corresponding to a first predetermined number of pixels in a process direction; identifying an image density of activated pixels in a second region of the image data that includes the at least one activated pixel corresponding to the inoperable inkjet, the second region of the image data having a length corresponding to a second predetermined number of pixels in the process direction, the second predetermined number of pixels being greater than the first predetermined number of pixels; operating one other inkjet to eject ink drops onto an image receiving surface at a plurality of locations corresponding to the plurality of activated pixels for the inoperable inkjet in response to the identified image density for the first region exceeding a first predetermined density threshold; modifying the image data to include an additional plurality of activated pixels proximate to the plurality of activated pixels corresponding to the inoperable inkjet in response to the identified image density for the second region exceeding a second predetermined density threshold and the identified image density for the first region not exceeding the first predetermined density threshold, the additional plurality of activated pixels corresponding to a plurality of inkjets that are proximate to the inoperable inkjet in the cross-process direction; and operating the plurality of inkjets proximate to the inoperable inkjet to eject ink drops with reference to the additional plurality of activated pixels in the image data in response to the identified image density for the second region exceeding the second predetermined density threshold and the identified image density for the first region not exceeding the first predetermined density threshold.