Patent ID: 9098903
Filing Date: 2015-08-04
Classification: G06T,H04N

Abstract:
1. A method of detecting an alignment error, comprising the steps of: controlling a first inkjet printhead to image on a substrate a first plurality of substantially parallel lines extending along a first direction, wherein the first plurality of lines includes a first line and a second line, and the first line and the second line are spaced apart along a second direction substantially orthogonal to the first direction; controlling a second inkjet printhead to image on the substrate a second plurality of substantially parallel lines extending along the first direction, wherein the second plurality of lines includes a third line and a fourth line, the third line and the fourth line are spaced apart along the second direction, and the lines imaged by the first and second inkjet printheads form an alignment pattern; collecting data relating to the alignment pattern, including the step of measuring distances between the first line and the third line, the first line and the fourth line, the second line and the third line, and the second line and the fourth line; and analyzing the collected data to determine an alignment error between the first and the second inkjet printheads.