Grayscale printing with spatial light modulator and sliding wind

Details Grayscale printing with spatial light modulator and sliding wind Grayscale printing with spatial light modulator and sliding wind

1997-01-06

1998-02-24

Frahm, Eric

Facsimile and static presentation processing

Facsimile

Recording apparatus

358300, 358455, 358464, 347239, H04N 140, H04N 123, H04N 138, G01D 942

Patent

active

057216223

ABSTRACT:
A method for printing grayscale images that compensates for problems in the printing process. The presence of a defective element on a spatial light modulator (12) is compensated for using a background value. The background value is determined by the number of defective elements stuck in the ON position, and that value is added to all of the exposure values of the elements, creating exposure data. In one embodiment, a defect intensity value is subtracted from those pixel exposure values affected by defective elements. The exposure data is used to generate microimages on a photoreceptive drum, the data is decremented and the steps are repeated until an entire image has been produced.

REFERENCES:
patent: 5453778 (1995-09-01), Venkateswar et al.
patent: 5459492 (1995-10-01), Venkateswar
patent: 5493322 (1996-02-01), Ng et al.
patent: 5510824 (1996-04-01), Nelson
patent: 5612728 (1997-03-01), Kun et al.
patent: 5614937 (1997-03-01), Nelson

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