Method and apparatus for generating screened halftone images

Details Method and apparatus for generating screened halftone images Method and apparatus for generating screened halftone images

1983-12-21

1985-12-03

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358280, 358298, H04N 140, H04N 122

Patent

active

045569185

ABSTRACT:
Apparatus and method for generating screened halftone images, which includes means for assuming an area of halftone dots with desired periodicity and tone reproducibility, subdividing the area into minute cells and setting address values (X, Y) for each of the minute cells, computing out a threshold value of density for each of said cells as a function f (X, Y) of the relevant address values (X, Y), and using the computed value as threshold value of density for the cell, means for obtaining a density-related video signal of the portion of the original corresponding to each of said cells by scanning the original, and means for producing halftone dot signals by comparing the video signals and the threshold value of density with each other.

REFERENCES:
patent: 3916096 (1975-10-01), Everett et al.
patent: 4280144 (1981-07-01), Bacon
patent: 4449150 (1984-05-01), Kato
patent: 4485408 (1984-11-01), Kamizyo et al.
patent: 4486788 (1984-12-01), Yamada

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