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US 5,627,652 AGranted
Multibit RAM for parallel lookup of high resolution halftone screens
AssigneeXerox Corporation
InventorsMargaret Motamed, William P. Gunther
Life of this patent
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AssigneeXerox Corporation
InventorsMargaret Motamed, William P. Gunther
Estimating the term…
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.
In a printer which prints a number, n, of bits per colored dot, one dot for each dot clock, the method of generating a transition from one color to another internal to a dot in accordance with a mask, comprising the steps of:
In a printer which prints a number, n, of bits per dot, one dot for each dot clock, the circuit for generating a transition from a first color to a second color within a dot in accordance with mask bits, comprising:
Dependencies are inferred from the claim text.