
Component video
color coding for SDTV
25
Video uses the symbols U and V
to represent certain color differ-
ence components. The CIE
defines the pairs
[u, v], [u', v'],
and [u* v*]. All of these pairs
represent
chromatic
or chroma
information, but they are all
numerically and functionally
different. Video [U, V] compo-
nents are neither directly based
upon, nor superseded by, any of
the CIE color spaces.
Various scale factors are applied to the basic color
difference components
B'-Y'
and R'-Y' for different
applications. In the previous chapter, I introduced luma
~r,u color difference coding; in this chapter, l wi,,