Patent · US Active

Multilevel density compensation for digital printing machines

US10538104B2 · kind B2 · utility

1Cited by

1References

9Claims

0Family size

Assignee

Heidelberger Druckmaschinen AG · DE

Inventors

Martin Mayer · Ladenburg, DE
Ilias Trachanas · Plankstadt, DE
Andreas Schoemann · Heidelberg, DE
Gerd Junghans · Schwetzingen, DE
Thomas Schrank · Oyten, DE

Key dates

Filing date	Feb 15, 2018
Grant date	Jan 21, 2020
Priority date	—
Expiry date	Jul 20, 2038

Classification

Technology area (CPC H)Electricity
CPC primaryH04N1/502
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

A method corrects color density unevenness during a printing operation on an inkjet printing machine having printing nozzles and a computer. The computer modifies the number or size of the drops to be applied to a printing substrate to attain nominal color density values after the processing of a rasterized print image. For different actual tone values, it is determined which target tone value is required to attain a nominal coloration by measuring a test image for every printing nozzle using a color measurement device, and, based thereon, an area coverage-dependent compensation profile is determined and saved on the computer to be applied in the printing operation to calculate the number and size of the drops on the computer.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.