Appeal No. 1997-0401
Application 08/305,262
applied references to Oz, and particularly Keith, fail to
teach or suggest at least this
important feature of adding different dither value matrices to
pixels "wherein the time-averaged value of said dither values
at a given pixel location is zero" (independent claim 1 on
appeal).
Representative method claim 1 is reproduced below:
1. In a digital video processing system, a method for
dithering quantized color values having a given step size
during a color conversion process, comprising the steps of:
(A) adding a set of dither values to first color values
throughout a first frame of digital video values;
(B) adding a different set of dither values to
second color values throughout a second frame of digital video
values, said second frame being subsequent to said first frame
in time sequence; and,
(C) repeating steps (A) and (B) for subsequent
frames in time order;
wherein the time-averaged value of said dither
values at a given pixel location is zero.
The following references are relied on by the examiners:
Keith 5,381,180 Jan. 10,
1995
(filed Aug. 16,
1993)
Oz 5,450,098 Sep. 12,
3
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