Black and white defect correction for a digital micromirror prin

Details Black and white defect correction for a digital micromirror prin Black and white defect correction for a digital micromirror prin

1994-11-17

2000-06-13

Angebranndt, Martin

Radiation imagery chemistry: process, composition, or product th

Including control feature responsive to a test or measurement

345149, 345 89, 345 90, 347240, 382264, 382275, G06K 940

Patent

active

060747900

ABSTRACT:
A method for defect-correction printing. A spatial light modulator that is used to generate the image is mapped for defects. The ON defects are compensated by setting a background level that is equal to the cumulative exposure of the ON defects, and then this background level becomes the threshold for development by the electrophotographic process. The system compensates for OFF defects by allocating the bits and exposures necessary to approximate the OFF defects to operative elements, thereby keeping the cumulative exposure for that pixel in the final printed image exactly, or as closely as possible, equal to the desired exposure. The corrections are contained in a defect correction module (10) that generates the appropriate patterns with the correct allocations to minimize error.

REFERENCES:
patent: 4259662 (1981-03-01), Yoshida
patent: 4348100 (1982-09-01), Snelling
patent: 4560999 (1985-12-01), Tokuhara
patent: 4995703 (1991-02-01), Noguchi
patent: 5028939 (1991-07-01), Hornbeck et al.
patent: 5247375 (1993-09-01), Mochizuki et al.
patent: 5339093 (1994-08-01), Kumagai et al.
patent: 5406213 (1995-04-01), Henley
patent: 5461411 (1995-10-01), Florence et al.

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