Appeal No. 1998-0884 Page 3
Application No. 08/084,642
Claim 2, which is representative for our purposes,
follows:
2. A picture signal encoding method comprising
the steps of:
receiving an interlaced signal having frames
each containing an odd field and an even field and
representing a current picture and at least one
other picture
first evaluating said odd and even fields for
said frame representing said current picture to
determine how much data is produced if said current
picture is encoded by frame-based predictive
encoding, said frame-based predictive encoding using
only odd field data and even field data from a
previously encoded reference picture as a prediction
of said current picture;
second evaluating said odd and even fields for
said frame representing said current picture to
determine how much data is produced if said current
picture is encoded by field-based predictive
encoding, said field-based predictive encoding using
only either the odd field data or the even field
data from the previously encoded reference picture
as the prediction of said current picture;
determining whether frame-based prediction
encoding or field-based prediction encoding of said
current picture produces a lesser quantity of data;
selecting said frame-based predictive encoding
or said field-based predictive encoding as a
function of the predictive encoding that produces
said lesser quantity of data; and
predictively encoding said current picture
relative to at least one of the other pictures
represented by said interlaced signal using the
selected one of said frame-based predictive encoding
and said field-based predictive encoding.
The reference relied on in rejecting the claims follows:
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