Appeal No. 2006-1605
Application No. 09/470,741
downsampling ratios other than a power of two may be
implemented, such as, for example, 3:1.
[0027] As illustrated in FIG. 2, the motion compensation
hardware may operate directly on the downsampled bit stream.
In this particular embodiment, where MPEG2 is employed, the
downsampling ratio may be n, where n equals 1, 2, 4, and 8.
In a motion compensation process, a motion vector of a
processed macroblock specifies the relative distance of
reference data from the processed macroblock. Let (V.sub.x,
V.sub.y)=(vector[r][0], vector[r][1]) be the original motion
vector for a macroblock, where V.sub.x and V.sub.y, the
horizontal and vertical components of the motion vector, are
in the form of 16-bit signed value, although the invention
is not limited in scope in this respect. According to the
MPEG2 standard, the least significant bit (LSB) of V.sub.x
and V.sub.y is used to indicate the half-pixel resolution
reference.”
Thus, the claim does require performing motion compensation
for the down-sampled image in the spatial domain, wherein the
step of performing the motion compensation includes the further
step of scaling a motion vector in accordance with a down
sampling ratio, and wherein the motion vector specifies the
relative distance of reference data from a macroblock.
Now, the question before us is what Vetro, Ng and Bose would have
taught to one of ordinary skill in the art? To answer this
question, we find the following facts:
1. Vetro states at page 4, section 2, paragraphs 1 and 2, the
following:
The focus of this section is to provide an expression for
the optimal set of low-resolution MC filters given a set of
down-conversion filters. The resulting filters are optimal
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