Halftone correction system

Details Halftone correction system Halftone correction system

1994-04-08

1995-11-21

Reinhart, Mark J.

Facsimile and static presentation processing

Facsimile

Recording apparatus

347251, 358459, H04N 121

Patent

active

054692679

ABSTRACT:
Prior to printing on a digital printer a halftone reproduction of a continuous one original image, digital image signals are corrected for the effects of printed dot overlap generated by a particular chosen digital printer. The dot overlap correction is based upon superimposing a virtual screen on the printer-generated dot patterns such that the printer dots are centered at the orthogonal intersections of the lines defining openings in the screen. This centering approach allows for determination of printed dot overlap by a 2.times.2 matrix, so that only seven test patterns are required for characterization of the printer and for dot overlap correction of halftone prints produced by the printer.

REFERENCES:
patent: 4878068 (1989-10-01), Suzuki
patent: 5087981 (1992-02-01), Ng et al.
patent: 5278671 (1994-01-01), Takahashi
"Digital Halftoning", Text by Robert Ulichney MIT Press (1987)--Intro. Chapt. Pappas et al, J. Elect. Imaging 2(3), 193-204 (Jul. 1993).
Rosenberg, J. Electronic Imaging 2(3), 205-212 (Jul. 1993).

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