Computer graphics processing and selective visual display system – Display peripheral interface input device – Light pen for fluid matrix display panel
Patent
1997-05-30
2000-04-18
Saras, Steven J.
Computer graphics processing and selective visual display system
Display peripheral interface input device
Light pen for fluid matrix display panel
345147, G09G 510
Patent
active
060521139
ABSTRACT:
Data values representative of a source image are processed with a dither matrix having dither values corresponding to pixel locations in the source image. The dither matrix has dimensions n.times.n, where n is modulo 4 and an integer value m exists such that m.multidot.m=n. The dither matrix is typically a 4.times.4 matrix. The dither values are arranged in the dither matrix such that each row, column, diagonal and m.times.m submatrix in the dither matrix adds to substantially the same value, preferably the sum of all dither values in the dither matrix divided by n. A dither value corresponding to a pixel location is accessed in the dither matrix. An initial data value associated with the pixel location is combined with the accessed dither value, typically by adding, to provide an intermediate value. The intermediate value is clamped and truncated to provide a dithered data value. Where each pixel is represented by two or more data values, such as color values, a dither matrix is associated with each parameter. Preferably, the sum of the selected dither matrices is a matrix having matrix values that are substantially the same.
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Hewlett--Packard Company
Nelson Alecia D.
Saras Steven J.
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