Process for recording semihalftone images

Details Process for recording semihalftone images Process for recording semihalftone images

1987-09-21

1989-10-24

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358298, H04N 123, H04N 146

Patent

active

048766119

ABSTRACT:
A process involving scanning an original linewise and determining the tonal value of each scan dot. Multiple scan dots are collected into a scan field. The average tonal value of each scan field is determined by averaging the tonal values of the scan dots of that scan field. The original is reproduced on a recording medium by individual recording dots that can take the tone value "print" or "no-print". Several recording dots correspond to a scan field of the original. The tone value of the scan field can be reproduced almost exactly on the average by printing a specific number of recording dots. The distribution of recording dots to be printed for a scan field is determined by subdivision of the scan field into the smallest subfields. In this process, the scan field is subdivided in at least one subdividing step into these smallest subfields, the average tonal value of each resulting subfield being determined so that the number of recording dots to be printed in all subfields of a scan field correspond to the average tonal value of the scan field.

REFERENCES:
patent: 4075663 (1978-02-01), Wellendorf
patent: 4482923 (1984-11-01), Fischer et al.
patent: 4485397 (1984-11-01), Scheuter et al.
patent: 4500919 (1985-02-01), Schreiber
patent: 4531160 (1985-07-01), Ehn
patent: 4547812 (1985-10-01), Waller
patent: 4556918 (1985-12-01), Yamazaki
patent: 4561025 (1985-12-01), Tsuzuki
patent: 4578713 (1986-03-01), Tsao et al.
patent: 4651228 (1987-03-01), Koch
patent: 4651287 (1987-03-01), Tsao
patent: 4686538 (1987-08-01), Kouzato
patent: 4736253 (1988-04-01), Shida
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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