Patent ID: 7387361
Filing Date: 2008-06-17
Classification: B41J

Abstract:
1. A method for compensating for failed nozzles in multi-pass printing using an inkjet printer having at least one printhead containing a plurality of nozzles to print an input image having a plurality of raster lines on a receiver media, wherein the image is printed using a plurality of passes, and wherein the receiver media advance distance between passes is different at the leading and/or trailing edges of the page than the middle of the page, the method comprising the steps of: a. determining a plurality of image regions comprising two or more different regions wherein one region is at the leading or trailing edge and one region is in the middle of the page wherein the receiver media advance distance between passes is different at the leading or trailing edge regions of the page than the middle region of the page, each image region corresponding to at least one raster line of the input image; b. computing a different nozzle group list for each image region of said two or more image regions, wherein each nozzle group list describes a set of nozzles used to print each raster line of the image region during each pass; and c. using the nozzle group list to remap the printing of ink drops from the failed nozzle to at least one other nozzle.