De-screening halftones using sigma filters

Details De-screening halftones using sigma filters De-screening halftones using sigma filters

2005-09-20

2005-09-20

Lee, Thomas D. (Department: 2624)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C382S260000, C382S264000

Reexamination Certificate

active

06947178

ABSTRACT:
A digital imaging system and method uses a two-stage sigma filter to de-screen color images. This filter does not assume any a priori knowledge about the screening process using to produce the halftone image. The two-stage sigma filter may therefore be used to convert color halftone images into continuous-tone images irrespective of the screening process used. The two-stage sigma filter may be constructed, or emulated in software, using an O (N) algorithm which performs smoothing and preserves edge information simultaneously in the Red/Green/Blue color space. This system and method outperforms conventional approaches which, for example, use a Gaussian blur, because it satisfies the dual criteria of completely eliminating halftone screens while preserving edge information. When combined with halftone segmentation techniques, a complete document processing algorithm for gray-scale and color documents is created.

REFERENCES:
patent: 4777620 (1988-10-01), Shimoni et al.
patent: 5243444 (1993-09-01), Fan
patent: 5247588 (1993-09-01), Komatsu
patent: 5351314 (1994-09-01), Vaezi
patent: 5359676 (1994-10-01), Fan

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