Appeal No. 2005-2766
Application No. 09/682,659
Surati derives a display map by selectively driving the
display while sensing the display output (col. 6, lines 26-29).
“A stored pixel correction function based on the display map is
applied to pixel data corresponding to the images to be
displayed, and the display is driven from the corrected or
modified pixel data” (col. 6, lines 31-34). Surati preferably
uses overlapping projection displays, and “[b]y tiling the screen
with many such projection displays, each point on the entire
screen surface is covered by one or more displays” (col. 8,
lines 28-30). “No attempt is made to align the projectors,
either mechanically or electrically, either in position,
rotation, relative brightness, or relative hue” (col. 8,
lines 31-33). Instead, Surati “relies on the application of
large amounts of computation to perform the perfect ‘alignment’
of these display elements” (col. 8, lines 34-35). Surati’s
technique can be used “to correct for many types of distortion,
including, but not limited to: imperfections across the display,
misalignment of plural projectors in a common region; intensity
variations across the display; keystone distortion; trapezoidal
distortion; pin cushion distortion; barrel distortion; chromatic
aberration; color mismatch; and lateral and rotational
displacement” (col. 6, lines 38-45).
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