Appeal No. 1998-0220
Application No. 08/297,437
66b, with respective slow scan filter coefficients, operate on individual pixels within a
particular scanline simultaneously. The outputs from slow scan filters 68a and 68b are
passed to independent fast scan (second dimension) filters 68a and 68b, respectively.
Applying fast scan filter coefficients to filters 68a and 68b results in the filtered output of
channels 60 and 62, respectively. The output of one of the channels is selected via
multiplexer 72 to provide filtered video output on a pixel by pixel basis.
Appellants’ claim 1 requires, rather than the two separate fast scan filters shown in
Figure 2, “a single second dimension filter” for receiving the output signals from the first
dimension filters and means for controlling the “non-predetermined selection” of the first
dimension filter and the set of filter coefficients to be used as inputs to the single second
dimension filter. An embodiment of the invention is shown in appellants’ Figure 3, which
includes a multiplexer for selecting the output of the appropriate slow scan (first dimension)
filter as input to the single fast scan (second dimension) filter, with multiplexing of two fast
scan filter coefficients, for proper matching of the first and second dimension filters.
Thompson discloses, in “Prior Art” Figure 1, one of several filters -- a plurality of “M”
-- which is comprised of coefficients in memory 11 that operate on data in memory 13
through multiplier/accumulator 15. The output is to register 17. See Thompson, column 2,
lines 14-63. For advantages such as reduction in circuitry (see id. at column 4, line 64
through column 5, line 8), Thompson teaches using “one of M” multiplexor 32 for directing
output of each of filters 1 through M to appropriate output registers 1 (34) to M (36).
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