Image processing method to remove halftone screens

Details Image processing method to remove halftone screens Image processing method to remove halftone screens

1992-06-05

1993-08-24

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358298, H04N 1387

Patent

active

052393909

ABSTRACT:
A method and arrangement for reproducing an original image scans an original image to produce a digitzed image, performs a local structure analysis of the digitized image, and selectively applies a descreening filter to a region of the digitized image based on the results of the local structure analysis to remove a specific frequency of the digitized image caused by halftone screens. The descreening filter bypasses regions of the digitized image such that these bypassed regions remain unfiltered. The filtered regions and the bypassed regions are printed as a single, unified reproduction of the original image. This removes halftone screens from the image while maintaining the contrast of text.

REFERENCES:
patent: 4194221 (1980-03-01), Stoffel
patent: 4403257 (1983-09-01), Hsieh
patent: 4907096 (1990-03-01), Stansfield
patent: 4941190 (1990-07-01), Joyce

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