Memjet Technology Limited

Nigel Hoschke

Rodney Hardy

Steven Parker

A print medium having a calibration pattern printed thereon for generating alignment data for a printhead. The calibration pattern contains rows of spaced apart fiducials, each fiducial having a plurality of concentric shapes representing a Barker code.

Print medium for generating printhead alignment data

A method of printing an image using a printing system including at least first and second overlapping printhead segments, the method includes the steps of: feeding media past the printhead segments along a media feed direction; determining an extent of wander of the media in a direction perpendicular to the media feed direction; selecting a stitching method based on the determined extent of wander; and printing the image using the first and second printhead segments. The printing step includes stitching the first and second printhead segments using the selected stitching method.

Method of printing using overlapping printhead segments

A method of generating alignment data for a printhead. The method includes the steps of: printing a calibration pattern using the printhead, the calibration pattern including rows of spaced apart fiducials, each fiducial having a plurality of concentric shapes representing a code sequence; imaging the fiducials at a first resolution to generate imaged fiducials; cross-correlating a template fiducial with the imaged fiducials at a plurality of different displacement s relative to each imaged fiducial, the template fiducial having a configuration matching the imaged fiducials; determining a two-dimensional set of cross-correlation values for each imaged fiducial, each set of cross-correlation values indicating a center of a respective fiducial; and generating alignment data for the printhead using the sets of cross-correlation values.

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North Ryde, Australia

Nigel Hoschke