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Video Output Filtering
Examples of luma edge and chroma edge replication for 2 interspersed to
co-sited output are shown in Figure 4–23 and Figure 4–24, respectively.
Figure 4–23. Luma Edge Replication
a
Leading edge
replicated luma
Y' a = Y a
Y' a' = (–1Y a + 17Y a + 17Y b – 1Y c ) /32
Figure 4–24. Interspersed Chroma Edge Replication
cd
ab
Leading edge
replicated chroma
samples
Cb' a = (–3Cb cd + 33Cb ab + 101Cb ab –3Cb cd )/128
Cr' a = (–3Cr cd + 33Cr ab + 101Cr ab –3Cr cd )/128
Cb' b = (–3Cb ab + 101Cb ab + 33Cb cd –3Cb ef )/128
Cr' b = (–3Cr ab + 101Cr ab + 33Cr cd –3Cr ef )/128
Cb' c = (–3Cb ab + 33Cb ab + 101Cb cd –3Cb ef )/128
Cr' c = (–3Cr ab + 33Cr ab + 101Cr cd –3Cr ef )/128
Cb' d = (–3Cb ab + 101Cb cd + 33Cb ef –3Cb gh )/128
Cr' d = (–3Cr ab + 101Cr cd + 33Cr ef –3Cr gh )/128
4-24
Video Display Port
a
b
c
x
Horizontal Image Size
a
a'
b
b'
c
x
Y' b = Y b
Y' c = Y c
Y' x = Y x
Y' b' = (–1Y a + 17Y b + 17Y c – 1Y d ) /32
Y' x' = (–1Y w + 17Y x + 17Y y – 1Y z ) /32
a
ab
b
c
cd
d
Horizontal Image Size
a
a'
b
b'
c
c'
d
y
z
z
y
Trailing edge
x'
y
y'
z
z'
replicated luma
Y' y = Y y
Y' z = Y z
Y' z' = (–1Y y + 17Y z + 17Y z – 1Y y ) /32
Y' y' = (–1Y x + 17Y y + 17Y z – 1Y z ) /32
w
wx
x
y
yz
z
w
w'
x
x'
y
y'
z
z'
Cb' z = (–3Cb wx + 101Cb yz + 33Cb yz –3Cb wz )/128
Cr' z = (–3Cr wx + 101Cr yz + 33Cr yz –3Cb wx )/128
Cb' y = (–3Cb uv + 33Cb wx + 101Cb yz –3Cb yz )/128
Cr' y = (–3Cr uv + 33Cr wx + 101Cr yz –3Cb yz )/128
Cb' x = (–3Cb uv + 101Cb wx + 33Cb yz –3Cb yz )/128
Cr' x = (–3Cr uv + 101Cr wx + 33Cr yz –3Cr yz )/128
Cb' w = (–3Cb st + 33Cb uv + 101Cb wx –3Cb yz )/128
Cr' w = (–3Cr st + 33Cr uv + 101Cr wx –3Cr yz )/128
yz
wx
Trailing edge
replicated chroma
samples
SPRU629
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