Process for recording semihalftone images and device for convers

Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry

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358456, H04N 123, H04N 146

Patent

active

049395890

ABSTRACT:
The invention provides for deciding whether a recording dot is to be printed for the reproduction of scan dots. The scan dots being considered are compiled in an input switching network into groups, for which an arithmetic processor determines the tonal value sum. The arithmetic processor emits a signal, if the tonal value sum exceeds a certain figure. The recording dot to be printed is determined by the presence of the signal in an output switching network. This process is performed successively for increasingly larger areas of the original, that is, for increasingly larger quantities of scan dots.

REFERENCES:
patent: 4075663 (1978-02-01), Wellendorf
patent: 4482923 (1984-11-01), Fischer et al.
patent: 4485397 (1984-11-01), Scheuter et al.
patent: 4531160 (1985-07-01), Ehn
patent: 4578713 (1986-03-01), Tsao et al.
Karl R. Scheuter et al., "Frequency Modulated Picture . . . Distribution", pp. 1-12, Sep. 14, 1984, Cambridge, England.
Karl R. Scheuter et al., "Frequency Modulated Screening", GATF Technical Forum, 1985, pp. 1-13, FIGS. 1-13, Pitts, Pa.

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