Incremental printing of symbolic information – Electric marking apparatus or processes – Electrostatic
Reexamination Certificate
2003-06-16
2004-10-12
Eickholt, Eugene H. (Department: 2854)
Incremental printing of symbolic information
Electric marking apparatus or processes
Electrostatic
C358S001200, C358S001900, C358S003230, C182S155000, C182S156000
Reexamination Certificate
active
06803933
ABSTRACT:
FIELD OF THE INVENTION
The present invention related generally to systems and methods for determining dot gain.
BACKGROUND OF THE INVENTION
There typically exists a discrepancy between a digital dot area—the size of an ink dot intended to be generated by a printing apparatus—and the actual printed dot area created on the printing media. This can lead to detrimental effects in the quality of the resultant image. For example, a printer or press generally employs a fixed number of inks (for example, 1, 2, 3, 4, 5, 6, or 7 inks) and mixes different ink dots having different dot areas to achieve many more colors. If the printed dot areas are incorrect, the resultant colors or images appear incorrect.
In order to correct for this discrepancy, a dot gain table is typically used to relate printed dot area to digital dot area. To populate this table, one or more pages or swatches are printed using known digital dot areas for each color or ink. The printed dots are then measured. In this manner, a dot gain table is generated, with the points between measured points being interpolated from the measured data. In operation, the printer or press uses the measured and interpolated dot gain table to print the printed dot area desired. To keep up with drift in the press, this process needs to be performed as often as possible, and therefore requires a large number of pages for each calibration.
SUMMARY OF THE INVENTION
An embodiment of the present invention provides a method for determining dot gain. A state parameter is measured and provided as an input to a statistical learning system. Using the statistical learning system, a plurality of printed dot areas, each corresponding to a specified digital dot area, are estimated.
Another embodiment of the present invention provides a method for printing. A specified printed dot area is received, and a state parameter is input. A digital dot area corresponding to the specified printed dot area is determined using a dot gain lookup table corresponding to the input state parameter. A control signal corresponding to the determined digital dot area is generated.
REFERENCES:
patent: 5255085 (1993-10-01), Spence
patent: 5612902 (1997-03-01), Stokes
patent: 5943477 (1999-08-01), Rao et al.
patent: 5967050 (1999-10-01), Seymour
patent: 6027201 (2000-02-01), Edge
patent: 6134344 (2000-10-01), Burges
patent: 6232954 (2001-05-01), Rozzi
patent: 6243100 (2001-06-01), Curry et al.
patent: 6435654 (2002-08-01), Wang et al.
patent: 6499402 (2002-12-01), Sikes et al.
patent: RE38180 (2003-07-01), Edge
patent: 6650771 (2003-11-01), Walker
patent: 6654143 (2003-11-01), Dalal et al.
patent: 6671070 (2003-12-01), Schildermans et al.
patent: 2003/0065491 (2003-04-01), Roberts
patent: 2004/0012647 (2004-01-01), Sanger
patent: 2004/0032600 (2004-02-01), Burns et al.
patent: 2004/0125388 (2004-07-01), Piatt et al.
Bergman Ruth
Braverman Gregory
Fischer Mani
Greig Darryl
Harush Shlomo
Eickholt Eugene H.
Hewlett--Packard Development Company, L.P.
LandOfFree
Systems and methods for dot gain determination and dot gain... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Systems and methods for dot gain determination and dot gain..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Systems and methods for dot gain determination and dot gain... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3304083