Patent ID: 8469479

Claim:
A non-transitory computer readable medium storing computer executable instructions that, when executed by a processor, causes the processor to: advance a media in a process direction to cause a plurality of fiducials to appear successively within a sensor's focal width, wherein each fiducial includes a target and a background, with the target superimposed to the background, each target having: a substantially same target width, a substantially same optical density, and a position at a distinct distance from an edge of the media, and each background having an optical density less than the optical density of the targets and greater than an optical density of the media; utilize the sensor, at a fixed position relative to the edge and having a focal width substantially the same as the target width, to read an optical density for each fiducial; discern, by identifying an identified fiducial with the highest-read optical density, the target with which the sensor is most aligned; and utilize data indicative of a position of the discerned target relative to a desired position to cause movement of the sensor to the desired position.