Hp Indigo B.v.

Hewlett-packard Development Company, L.P.

Nimrod Lucas

Ran Soffer

Ofer Hollenberg

Eli Velner

Oren Aks

A position of a first registration mark printed on a substrate during an earlier printing operation is detected. A second registration mark is printed on the substrate during a current printing operation at a position on the substrate relative to the first registration mark based on the detected position of the first registration mark and a correction factor. An alignment difference between the position of the first registration mark and the position of the second registration mark is measured. A new correction factor for a subsequent printing operation is calculated by weighting the measured alignment difference according to a difference between the measured alignment difference and a previous measured alignment difference.

Calculating correction factors for subsequent printing operations by weighting measured alignment differences

Example implementations relate to determining a correction factor that converts a measured sensor distance to a calibrated sensor distance. The measured sensor distance may be based on an amount of substrate advancement through a web printing press between detecting a mark on the substrate at a first sensor and detecting the mark at a second sensor. The calibrated sensor distance may be the separation between the first sensor and the second sensor.

Measured sensor distance correction

Example implementations relate to determining a correction factor that converts a measured sensor distance () to a calibrated sensor distance (). The measured sensor distance may be based on an amount of substrate advancement through a web printing press () between detecting a mark (--N) on the substrate () at a first sensor () and detecting the mark at a second sensor (). The calibrated sensor distance () may be the separation between the first sensor and the second sensor.

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Nimrod Lucas