參數(shù)資料
型號： H.261
廠商： Electronic Theatre Controls, Inc.
英文描述： LINE TRANSMISSION OF NON-TELEPHONE SIGNALS
中文描述： 線傳輸非電話信號
文件頁數(shù)： 12/31頁
文件大?。?/td> 123K
代理商： H.261
Recommendation H.261 (03/93)
9
T 1 5 1 4 2 3 0 9 3 d 0 5
P S C
T R
P T Y P E
P S P A R E
P E I
P E
G O B d a a
F G U R E 5 H 2
S r u o p u a e
FIGURE 5/H.261...[
D05
] = 3 CM
4.2.2
Group of blocks layer
Each picture is divided into groups of blocks (GOBs). A group of blocks (GOB) comprises one twelfth of the CIF or one
third of the QCIF picture areas (see Figure 6). A GOB relates to 176 pels by 48 lines of Y and the spatially corresponding 88
pels by 24 lines of each of C
B
and C
R
.
Data for each group of blocks consists of a GOB header followed by data for macroblocks. The structure is shown in Figure
7. Each GOB header is transmitted once between picture start codes in the CIF or QCIF sequence numbered in Figure 6, even
if no macroblock data is present in that GOB.
1
2
1
3
4
3
5
6
5
7
8
QCIF
9
10
11
12
CIF
FIGURE 6/H.261
Arrangement of GOBs in a picture
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