
Figure 24.3 shows a time delay
element in the luma path. Luma is
delayed by a time interval equal to
the transit delay of chroma through
the chroma bandlimiting filters.
Eq 24.1 Rec. 601
Y'PBPR
encoding matrix (for SDTV)
p
iii2 o 87 o114 l
- 169 -0.331 0.5
5 -0.419 -0.081
Conventional luma/color difference coding
I explained constant luminance on page 75. True
constant luminance coding remains an intriguing possi-
bility, but at present all video systems use nonconstant
luminance coding, which I will now describe.
A conventional luma/color difference encoder is shown
in Figure 24.3 above. ...