Appeal No. 2002-1468
Application 09/038,219
spatial-temporal dithering unit 50. The spatial-temporal dither
signal is the sum of a signal from random value source 53 and a
temporal dither table 54. See page 14 of Appellants’
specification. A temporal dither may be accomplished by defining
a 4x4 spatial pattern block that changes on a frame-by-frame
basis and repeats every 4 frames. The following illustrates an
example of such a pattern. The values A, B, C, and D represent
the dither values 0.0, 0.25, 0.5, and 0.75, respectively. The
pattern has a spatial variation to eliminate flicker. Each frame
includes all four dither values, with pixel visiting all four
dither values during the four frames. See page 13 of Appellants’
specification. Also note that a table for each of the frames,
frame 0, frame 1, frame 2, and frame 3 are shown on page 13. The
M-bit video signal is fed to a summing device 52, where a
spatial-temporal dither value and a random value source is added
to the M-bit signal. See page 14 of Appellants’ specification
and figure 5. The random value dither breaks up spatial patterns
but does not contribute a temporal component, which can tend to
result in each pixel converging to a higher resolution signal
over time. See page 15 of Appellants’ specification.
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