Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1989-09-28
1992-06-02
Wieder, Kenneth A.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358 75, 358433, 358445, H04N 146, H04N 121
Patent
active
051191865
ABSTRACT:
RGB components of pairs of adjacent pels of a captured digitized image are averaged. A perceived color palette is constructed, each color being comprised of functionally combined RGB components of two different input palette colors. An array is formed of continuous colors, each indexed to the perceived palette color to which its RGB components are closest and indicating the two input palette colors defining the respective perceived color. RGB components for each averaged pel pair and the array index are then used to locate the perceived color closest thereto and, the two input palette colors corresponding to the perceived color. These two input colors are then substituted in a display for those of the two averaged pels and the process repeated for all averaged pel pairs. In a preferred embodiment, the difference between the perceived and averaged colors is diffused to adjacent averaged pels. An image is thereby readily produced having substantially more perceived colors than those available in the input palette.
REFERENCES:
patent: 4232311 (1980-11-01), Agneta
patent: 4477833 (1984-10-01), Clark et al.
patent: 4516155 (1985-05-01), Hennig et al.
patent: 4613948 (1986-09-01), Gharavi
patent: 4712141 (1987-12-01), Tomohisa et al.
patent: 4907075 (1990-03-01), Braudaway
Deacon John J.
Edgar Albert D.
Brown Glenn W.
Carwell Robert M.
International Business Machines - Corporation
Wieder Kenneth A.
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