John C.
Platt, CCSP Group, Microsoft Research
IEEE Signal Processing Letters, Vol. 7, No. 7, pp. 179-80, (2000).
Displays with repeating patterns of colored
sub-pixels gain spatial resolution by setting individual sub-pixels rather than
by setting entire pixels. This paper describes optimal filtering that produces
sub-pixel values from a high-resolution input image. The optimal filtering is
based on an error metric inspired by psychophysical experiments. Minimizing the
error metric yields a linear system of equations, which can be expressed as a
set of filters. These filters provide the same quality of font display as
standard anti-aliasing at a point size 25% smaller. This optimization forms the
filter design framework for Microsoft's ClearType.
optimal filtering, image
processing, fonts, patterned displays, liquid crystal displays, anti-aliasing,
ClearType
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