Game Development Reference
In-Depth Information
Table 4.2
(
d
x
,
d
y
)
value for
each prediction mode
Mode Index
d
x
d
y
dir
XY
3
11
−
4
0
4
2
−
1
0
5
11
−
8
0
6
1
−
1
0
7
8
−
11
0
8
1
−
2
0
9
4
−
11
0
10
1
−
4
0
11
1
−
8
0
12
0
0
0
13
1
8
0
14
1
4
0
15
4
11
0
16
1
2
0
17
8
11
0
18
1
1
0
19
11
8
0
20
2
1
0
21
11
4
0
22
4
1
0
23
8
1
0
24
0
0
0
−
25
8
1
1
26
4
−
1
1
27
11
−
4
1
28
2
−
1
1
29
11
−
8
1
30
1
−
1
1
31
8
−
11
1
32
1
−
2
1
where
ia
is equal to
(
r
[
M
]+
c
[
N
]
)
4 and
ib
is equal to
(
32
×
ih
×
i
mult
h
+
(
i
weight
h
>>
1
))/
i
weight
h
and
ic
is equal to
(
32
×
i
v
×
i
mult
v
+
(
i
weight
v>>
1
))/
i
weight
v
, where the labels are computed as:
i
mult
h
=
ib
mult
[
log
(
M
)
−
2
]
(4.27a)
v
=
[
)
−
]
i
mult
ib
mult
log
(
N
2
(4.27b)
