Appeal No. 2001-0343
Application 08/911,526
decimation operation where a decimation operation by the number 2
is illustrated "whereby every other pixel value is removed by
unit 1012." (Column 13, lines 13 and 14).
Returning to Figure 1, the block compressor 30/recompressor
of Canfield is detailed in Figure 3 as two principal elements
comprising a variable length compressor 316 and a fixed length
compressor 322 shown in more detail in Figures 4 and 5
respectively. The fixed length compressing network shown in
Figure 5 includes a quantizer 562 which "may be considered as a
form of look-up table." (Column 12, lines 10-11.) To the extent
that this teaching would indicate to the artisan that the
quantizer may be implemented in the form of a look-up table, its
functionality is limited because the output bits are stated to
represent addresses having 4-bit data in the case of 50%
compression. Different percentages of a compression appear to be
selectable according to this teaching of the references here and
at column 4, lines 23 to 33. The significant feature here is
that the table analogy appears to teach a constant 4-bit data
output value and not a corresponding hybrid quantization coding
technique using a first codeword set and a second codeword set,
where the second codeword set has a second fixed length shorter
that the first set as required by independent claims 1 and 6 on
5
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