Unscreening of stored digital halftone images by logic filtering

Details Unscreening of stored digital halftone images by logic filtering Unscreening of stored digital halftone images by logic filtering

1989-10-10

1991-06-25

Orsino, Joseph A.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358455, 358448, H04N 140

Patent

active

050270788

ABSTRACT:
The present invention is a method of unscreening a digitally created halftone image to reconstruct a continuous tone image, including the determination of the parameters of the halftone screen used to generate the halftone image, logically filtering the halftone image to determine approximate continuous tone levels, and optionally, smoothing the continuous tone levels of the reconstructed image to minimize the quantization errors introduced during the original screening or dithering process.

REFERENCES:
patent: 4630125 (1986-12-01), Roetling
patent: 4841377 (1987-06-01), Hiratsuka et al.
"A Survey of Electronic Techniques for Pictorial Image Reproduction", vol. Com-29, No. 12, 12/81 J. C. Stoffel/J. F. Moreland, pp. 1898-1925.

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