Method and apparatus for generating a half-tone image representa

Details Method and apparatus for generating a half-tone image representa Method and apparatus for generating a half-tone image representa

1984-12-26

1987-03-03

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 75, 358283, 358298, H04N 146, H04N 121, H04N 123, H04N 140

Patent

active

046479627

ABSTRACT:
A method and apparatus for generating a representation of a half-tone image including areas of different resolution. The apparatus comprises stores (2, 26) for storing digital color data representing color density information at low and high resolution respectively. A second store (25) stores spatial data indicating the type of image data to be used at each position on a record medium (7). A third store (2') is provided for storing half-tone dot information. A group of six light modulators (10) which generate six scanning beams are arranged side-by-side. A support (8) supporting the record medium (7) to be exposed to the scanning beams is provided while drive motors (6',9') cause relative movement between the support and the scanning beam. Scanning beam control means (25,27-32) determine the position of the beams relatively to the record medium (7) in use, compare the current position with the stored spatial data and control the beam in response to the previously generated digital color data and in response to the half-tone dot information. The plurality of beams are controlled together and at a first rate in response to low resolution data and singly or in groups and at a higher, second rate in response to high resolution image data.

REFERENCES:
patent: 4004079 (1977-01-01), Boston
patent: 4135212 (1979-01-01), Pugsley et al.
patent: 4276567 (1981-06-01), Wellendorf et al.
patent: 4320419 (1982-03-01), Cottriall
patent: 4496989 (1985-01-01), Hirosawa
patent: 4516139 (1985-05-01), Takiguchi
patent: 4553172 (1985-11-01), Yamada et al.

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