Symptomatic reduction of banding artifacts

Details Symptomatic reduction of banding artifacts Symptomatic reduction of banding artifacts

2002-11-08

2004-01-27

Nguyen, Thinh (Department: 2861)

Incremental printing of symbolic information

Ink jet

Ejector mechanism

C347S019000

Reexamination Certificate

active

06682173

ABSTRACT:

BACKGROUND
The HP Indigo line of digital printing presses is based on digital offset color technology, which combines ink-on-paper quality with multicolored printing on a wide range of paper, foil and plastic substrates These digital printing presses offer short-run printing, on-demand service and personalization, all at an affordable price.
Banding artifacts are visually noticeable tone fluctuations that usually appear as horizontal or vertical stripes across prints. Banding artifacts made by digital printing presses can appear as dark bands across smooth mid ink-load patches located at impact zones on the prints. These banding artifacts are undesirable, as they can degrade quality of the prints.
Possible causes of banding artifacts in digital printing presses include process speed variations, machine vibrations, drum impact, and other mechanical, physical, chemical, environmental, and algorithmic instabilities. Visibility of the banding artifacts can be reduced by identifying and correcting the cause or causes of the banding artifacts.
SUMMARY
Visibility of banding artifacts can be reduced by correcting the symptom instead of the cause. According to one aspect of the present invention, a digital image is reproduced by printing a set of test patterns with a print engine that produces banding artifacts; generating a parametric artifact model of the banding artifacts in the prints of the test patterns; modifying the digital image with the parametric artifact model, and using the print engine to make prints of the modified digital image. The modifications cause a reduction in visibility of banding artifacts in the prints of the modified digital image.
Other aspects and advantages of the present invention will become apparent from the following detailed description, taken in conjunction with the accompanying drawings, illustrating by way of example the principles of the present invention.


REFERENCES:
patent: 6137592 (2000-10-01), Arquilevich et al.
patent: 6494558 (2002-12-01), Doval et al.

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