Game Development Reference
In-Depth Information
[
][
]
C
d
y
d
x
is the filter coefficients defined as follows:
⊡
⊣
⊤
⊦
0400
−
4626 0
−
65615
−
1
−
54725
−
3
C
[
8
][
4
]=
−
43636
−
4
−
32547
−
5
−
32547
−
5
−
−
11556
6
−
062
4
The final prediction sample
a
x
,
y
(
d
x
,
d
y
)
should be clipped into the range
1), and
a
x
,
y
(
(0, (1
is the temporary value of the pixel on
the integer pixel row and is defined as follows:
<<
BitDepth)
−
d
x
,
0
)
a
x
,
y
(
d
x
,
0
)
=
(
C
[d
x
][0]
×
A
x
−
1
,
y
+
C
[d
x
][1]
×
A
x
,
y
+
C
[d
x
][2]
×
A
x
+
1
,
y
+
C
[d
x
][3]
×
A
x
+
2
,
y
+
((
1
<< (
BitDepth
−
8
))>>
1
))
<<
(
−
BitDepth
8
)
(4.44)
4.4 Reference Picture Management
Reference picture management is an important part in video encoding and decoding
process, and has great influence for coding performance. InAVS2, a flexible reference
picture management scheme is designed, called reference configuration set (RCS),
which consists of reference picture information, is used to manage the reference
picture. Based on RCS, the reference picture set for current coding picture can be
arbitrarily configured.
In AVS2, there are three typical coding structure, including low delay P structure,
all intra coding structure and hierarchical B coding structure. In low delay P coding
structure, four nearest reconstructed pictures are chosen as the reference pictures, as
is shown in Fig.
4.16
. And AVS2 used a sliding window to remove unused picture
from the decoded picture buffer (DPB). In hierarchical B coding structure one for-
ward reconstructed picture and one backward reconstructed picture are selected as
Fig. 4.16
Low delay P
coding structure
