Automatic multimode continuous halftone line copy reproduction

Details Automatic multimode continuous halftone line copy reproduction Automatic multimode continuous halftone line copy reproduction

1978-12-26

1980-03-18

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358257, 358280, 364515, H04N 140

Patent

active

041942213

ABSTRACT:
An image data handling system to automatically detect and segregate from a stream of image pixels high frequency half-tone image input, continuous tone image input, low frequency half-tone image input, and line image input which may be present in the pixel stream. The image pixels are first autocorrelated in accordance with a predetermined algorithm to detect if high frequency half-tone image data is present. Data of this type found is processed by first descreening and then rescreening at a lower frequency to provide binary level pixels. The pixel stream is analyzed for the presence of continuous tone image data. Where found, such data is processed by a template screening process to provide binary level pixels. Remaining pixels comprising low frequency half-tone and line copy image data are thresholded to provide binary level pixels.

REFERENCES:
patent: 3819854 (1974-06-01), Kolb
patent: 3965289 (1976-06-01), Pugsley
patent: 4004079 (1977-01-01), Boston
patent: 4032977 (1977-06-01), Liao

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