Appeal No. 2002-1961
Application No. 09/133,430 Page 11
we find that when intra-field encoding is being executed, the
present signal is used. We further find that when operating
Owada in a fashion such that a picture represents a field, that
it is not clear from the disclosure of Owada whether the
difference signal, produced by subtracting the predictive video
signal produced by 121 from the signal output from block dividing
circuit 103, involves differential data from two fields of the
same frame. However, from the admission of appellants (reply
brief, page 4) that "[a]ppellant recognizes that intra-frame
coding can involve differential data derived from two fields of
the same frame," we find that Owada inherently teaches
"compression-coding another field of the input progressive image
signal using differential data between said one field and said
another field, wherein said one field and said another field are
of the same frame" as recited in claim 1.
Nevertheless, from the disclosure of Murashita that only one
of the fields is used, and the disclosure of Owada that the
discrimination circuit 106 compares the efficiencies for encoding
the signal of the present frame and the predictive frame and
outputs a result which indicates which signal is better for
encoding, we find no teaching or suggestion, and no convincing
line of reasoning has been advanced by the examiner, that would
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