ISO/IEC 10918-1 : 1993(E)
A
1
A
A
2
n
X
Y
1
2
n
X
Y
1
2
n
X
Y
B
B
B
C
C
C
TISO0760-93/d012
A , A , ....A ,
1 2
n
B , B , ....B ,
C , C , ....C
1
2
n
1
2
n
Scan 1
Scan 2
Scan 3
Data unit encoding order, non-interleaved
A , B , C , A , B , C , ....A , B , C
2
1
1
1
2
2
n
n
n
Scan 1
Data unit encoding order, interleaved
Figure 12 Interleaved versus non-interleaved encoding order
FIGURE 12 [D12] 9,5 cm = 371 %
These control procedures are also able to handle cases in which the source image components have different dimensions.
Figure 13 shows a case in which two of the components, B and C, have half the number of horizontal samples relative to
component A. In this case, two data units from A are interleaved with one each from B and C. Cases in which components
of an image have more complex relationships, such as different horizontal and vertical dimensions, can be handled as
well. (See Annex A.)
A
1
A
A
2
n
X
Y
1
2
Y
B
B
n/2
B
1
2
Y
n/2
C
C
C
TISO0770-93/d013
X/2
X/2
A , A , B , C , A , A , B , C , ....A , A , B , C
2
3
4
n-1
n
1
2
1
1
2
n/2
n/2
Scan 1
Data unit encoding order, interleaved
Figure 13 Interleaved order for components with different dimensions
FIGURE 13 [D13] 8 cm = 313 %
20
CCITT Rec. T.81 (1992 E)