Multibit RAM for parallel lookup of high resolution halftone scr

Details Multibit RAM for parallel lookup of high resolution halftone scr Multibit RAM for parallel lookup of high resolution halftone scr

1995-10-18

1997-05-06

Frahm, Eric

Facsimile and static presentation processing

Facsimile

Recording apparatus

358456, 358462, 358518, 358534, H04N 140, H04N 146

Patent

active

056276524

ABSTRACT:
In a printer for printing text of one color over a background of another color, a method and circuit for allowing the text character outline boundaries to pass through the color halftone dots, creating partial dots in the process, the partial dots within the character boundaries being of the color of the text, and the partial dots outside of the character boundaries being the color of the background. To use a numerical example, to produce an eight bit output dot through which a boundary passes, fifteen halftone bits in the first color are produced for each dot clock, and the rightmost seven bits are latched for the next cycle. On the next clock, fifteen bits are produced, and the leftmost 7 are aligned with the latched seven. If the bits are to the left of the boundary, bits from the first cycle are output, and if the bits are to the right of the boundary, bits from the second cycle are used.

REFERENCES:
patent: 4803643 (1989-02-01), Hickey
patent: 4949188 (1990-08-01), Sato
patent: 4958219 (1990-09-01), Kadowaki
patent: 4963898 (1990-10-01), Kadowaki et al.
patent: 5113492 (1992-05-01), Ariki et al.
patent: 5225911 (1993-07-01), Buckley et al.
patent: 5563985 (1996-10-01), Klassen et al.

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