Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1993-10-07
1994-12-20
Evans, Arthur G.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358535, G06F 1500
Patent
active
053751914
ABSTRACT:
The method approximates full color resolution by combining dot-on-dot (DOD) and dot-next-to-dot (DND) techniques in printing images received from a computer. The method prints with DOD at the edge of an image or in a depleted area within an image and prints with DND elsewhere within the image to conserve printing time and ink. In the method, the color for each dot of the image is stored, and the image is divided into subgroups of four dots each. Each dot is then tested for significance by looking at whether other dots within the group or adjacent to the group are white. The color for each dot is mapped to one or more colors for printing, the mapping depending on the significance status of at least one dot within the subgroup. In this manner the image is checked for solid and depleted areas of color so that the minimum number of dots are printed within each subgroup.
REFERENCES:
patent: 4485397 (1984-11-01), Schueter et al.
patent: 4930007 (1990-05-01), Sugiura et al.
patent: 5012257 (1991-04-01), Lowe et al.
patent: 5134667 (1992-07-01), Suzuki
Evans Arthur G.
Hewlett--Packard Company
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