Half-tone dot imaging

Details Half-tone dot imaging Half-tone dot imaging

1985-04-25

1986-11-18

Perkey, William B.

Boots, shoes, and leggings

358283, 358298, H04N 123, H04N 140

Patent

active

046239723

ABSTRACT:
Method and apparatus for generating a half-tone dot representation of an original image which has been previously generated as one or more color separations each comprising a plurality of cells (12), each cell being digitally encoded in accordance with the color density at that point is described. The apparatus comprises a record medium support (8); a plurality of scanning beam generators arranged side by side, the scanning beams (B1-6) and the record medium support (8) being relatively movable. First control means controls the scanning beams during relative movement between the scanning beams and the record medium support (8) in response to the digital information and half-tone dot information to generate a plurality of half-tone dots (14) at a first rate, each dot corresponding to one or more of the plurality of cells (12). Storage means (23) for storing additional control information; and second control (24) means for determining the position of the scanning beams relatively to the record medium, determining whether that position corresponds to part of a boundary of an image poriton, and, if it does, for at least one color separation, for each cell at the boundary of an image portion modifying the plurality of scanning beams in response to the additional control information:

REFERENCES:
patent: 3922484 (1975-11-01), Keller
patent: 4025189 (1977-05-01), Pugsley
patent: 4276567 (1981-06-01), Wellendorf et al.
patent: 4468442 (1984-08-01), Sakamoto

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