Computer graphics processing and selective visual display system – Display peripheral interface input device
Patent
1995-03-13
1997-01-28
Weldon, Ulysses
Computer graphics processing and selective visual display system
Display peripheral interface input device
345199, G09G 506
Patent
active
055981860
ABSTRACT:
Red, green and blue pixels of a digitized image are combined to form a single vector that points to three lookup tables translating each pixel to linear Y, I, Q values thereby forming a linear image. The color value of each pixel in the linear image, comprised of Y, I, Q "aim" values, is then sequentially processed to attempt a match to the closest available colors. These three aim values point to respective lookup tables which translate them to three corresponding intermediate numbers which, when summed, point to a larger table mapping them to a number corresponding to the closest color in the predetermined palette. Three lookup tables translate the map number back to the linear space with corresponding mapped Y, I, Q values. The difference between these values and prior aim values constitutes error arising from the finite palette. The error is corrected with opposite error of adjoining pixels by error diffusion techniques.
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Carwell Robert M.
International Business Machines - Corporation
Lao Lun-Yi
Weldon Ulysses
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