Patent ID: 8845059
Filing Date: 2014-09-30
Classification: B41J

Abstract:
1. A method for aligning multi-channel digital image data for a digital printer having a plurality of printheads, each printhead printing digital image data for a particular channel, comprising: receiving one or more scanned test patterns formed by using an imaging device to capture an image of a test pattern printed using the digital printer, the test pattern including test pattern indicia printed using individual printheads; analyzing the scanned test patterns to detect locations of the printed test pattern indicia; determining reference test pattern indicia locations; designating at least one of the printheads to be a non-reference printheads; determining one or more spatial adjustment parameters for each of the non-reference printheads responsive to the detected locations of the corresponding printed test pattern indicia and the reference test pattern indicia locations; receiving multi-channel digital image data for a multi-channel digital image, the multi-channel digital image data including image pixels having pixel values; modifying the digital image data for the channels associated with the non-reference printheads in accordance with the determined spatial adjustment parameters, wherein the modification of the digital image data includes: printing the modified digital image data using the digital printer; wherein the modification of the digital image data provides improved alignment between image content printed with the reference and non-reference printheads.