Appeal No. 1998-0879
Application 08/251,730
lines 35-41). Each elementary unit corresponds to one of
four types: unchanged, homogeneous, pattern, or
predetermined pattern (col. 4, lines 43-45). In the
protocol of the compressed video data stream 38, elementary
units are organized as quadruples, and a byte header having
four two-bit dyads defines the corresponding type of each of
the four elementary units (col. 4, lines 50-61). A
predetermined pattern elementary unit type is encoded as an
index block 54 into a table of predetermined bit map
patterns 56 (col. 5, lines 14-28). Kantner discloses
"escape codes" as follows (col. 5, lines 36-43):
If the table of patterns 56 is limited in number,
certain entries in the table may be designated as
escape codes. Subsequent to a byte header 68,
occurrence of an escape code 70 in the location of an
index block is indicated. Such escape codes can
indicate a number of things including, run lengths of
elementary units which are unchanged or homogeneous.
Subsequent to the escape code a supplemental run length
block 72 may be provided. [Emphasis added.]
Thus, Kantner discloses an escape code 70 following a header
68 in a compressed video data stream 38.
Appellants agree that the dyad values within a byte
header (e.g., dyads 44, 46, 48, and 50 having dyad values
00, 01, 10, 11 in byte header 42 shown in figure 3 of
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