Information Technology Reference
In-Depth Information
Table 1.
Ordered mode information
Type of mode
Mode number of JSVM
Proposed mode number
SKIP
0
0
16
×
16
1
1
16
×
8
2
2
8
×
16
3
2
8
×
8
4
4
I
4
MB
6
6
I
16
MB
12
6
80
92
16x8
8x16
SUB8x8
90
75
88
70
86
65
8x4
4x8
4x4
84
60
82
55
80
50
78
20
22
24
26
28
30
32
34
36
20
22
24
26
28
30
32
34
36
QP
QP
(a)A 16
×
16 mode and other modes
(b)A 8
×
8 mode and detailed block modes
Fig. 7.
Distribution of the conditional probabilities for a search direction between
the representative mode and other modes(The average of Foreman, Bus and Mobile
sequences)
where
BL Mode
complexity
represents the proposed mode number of the base
layer in Table 1.
QP
BL
and
QP
EL
represent the quantization scales in the base
layer and enhancement layer, respectively.
3.2 Directional Motion Search
The hierarchical-B picture is constructed using the bi-directional motion search
with both forward reference and backward reference pictures as shown in Fig. 6.
This technique achieves a high encoding eciency but it increases the compu-
tational complexity of the encoder. Therefore, we propose a directional motion
search to reduce the complexity.
We performed an analysis of the characteristics of the bi-directional motion
search. Fig. 7 shows the mode correlation between the representative mode
(16
×
16 or 8
×
8) and other modes. Fig. 7(a) shows the mode correlation between
the 16
16).
It means that the search direction for MB partition modes is highly correlated
between the current MB and the corresponding MB for previous temporal level.
However, the 16
×
16 and other mode within MB partition modes (16
×
16, 16
×
8, 8
×
×
16 search direction has a lower correlation value with the 8
×
8
Search WWH ::
Custom Search