Appeal No. 2002-1961
Application No. 09/133,430 Page 7
the field different from the field which was
compressed in the previous frame is designated
as a target to be compressed.
We find from the disclosure of Murashita that although Murashita
teaches compression coding one field of an input progressive
signal composed of frames, using only data from the field;
Murashita only uses either the odd field, the even field,
alternates between the fields, or uses one field or the other as
a target to be compressed depending on whether the code amount of
the previous field exceeds a threshold value. In any event,
Murashita does not use both fields of the same frame for
compression coding of another field of the input image signal
wherein the one field and the another field are of the same
frame, as required by independent claim 1. Owada relates to an
image encoding device which uses a correlation between adjacent
pictures (frames or fields) of a video signal (col. 1, lines 9-
12). As shown in figure 1, 103 shows a block dividing circuit
for changing the order of pixels included in the video signal and
for dividing the pixels into a plurality of blocks, each of which
is comprised of pixels. 104 shows a subtracting circuit which
calculates a difference between a video signal of a present frame
and a predictive video signal. 105 shows a switching circuit
which outputs a signal from the block dividing circuit 103 and
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