Appeal No. 2002-1468
Application 09/038,219
USPQ2d at 1819.
Appellants’ specification discloses two methods of reducing
contour. In the first method, the high resolution error has an
error component and a non-error (display resolution) component.
The error component is comprised of the less significant bits of
the pixel value, that is, the bits that are not part of the
display resolution. For each pixel value, the error component of
the previously processed pixel value is fed back and added to the
random value. The sum is added to the high resolution value, and
the resulting value is truncated to the display resolution. The
truncated values comprise the signal that drives the spatial
light modulator. See page 4 of Appellants’ specification. We
note that Appellants’ claim 1 as originally filed is directed to
this method. We further note that claim 1 has been canceled.
Another aspect of Appellants’ invention is directed to
dithering methods of reducing contouring. Like the high
resolution error method just described, the dithering methods
operate on a high resolution signal that has an error component.
One or more dither signals are added to the high resolution
signal, and no feedback is used. See page 4 of Appellants’
specification. In the embodiment as claimed, the invention is
directed to dithering methods of reducing contouring. The one
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