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YCbCr 4:2:2
interspersed
source pixels
2x upscaled
YCbCr 4:2:2
co-sited output
Cb'
= (-3Cb
+ 101Cb
d
ab
Cr'
= (-3Cr
d
ab
4.4.4 Edge Pixel Replication
Because four tap filters are used on the output, the first and last two pixels on each line must be mirrored.
An example of how the filter uses the mirrored pixels for the luminance filter (2x co-sited) is shown in
Figure
4-18.
Leading edge
replicated pixel
Y'
Examples of luma edge and chroma edge replication for 2x interspersed to co-sited output are shown in
Figure 4-19
and
Figure
Leading edge
replicated luma
SPRUEM1 – May 2007
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Figure 4-17. 2x Interspersed Scaling
a
b
c
a a' b b' c c' d d' e e'
Y'
= Y
a
a
+ 33Cb
3Cb
) / 128
cd
ef -
gh
+ 101Cr
+ 33Cr
3Cr
) / 128
cd
ef -
gh
Luma (Y)
Chroma (Cb/Cr)
-
-
sample
samples
Figure 4-18. Output Edge Pixel Replication
a
a
b
c
Horizontal Image Size
a
a'
b
b'
c
Y'
= Y
Y'
= Y
Y'
= Y
a
a
b
b
c
' = ƒ(Y
, Y
, Y
, Y
)
Y'
= ƒ(Y
a
a'
a'
b'
c
b'
Luma (Y)
Chroma (Cb/Cr)
-
-
sample
samples
4-20, respectively.
Figure 4-19. Luma Edge Replication
a
a
b
c
Horizontal Image Size
a
a'
b
b'
c
Y'
= Y
Y'
= Y
Y'
= Y
a
a
b
b
c
Y'
= (-1Y
+ 17Y
b'
a
b
Y'
= (-1Y
+ 17Y
+ 17Y
- 1Y
) /32
a'
a
a
b
c
d
e
f
g
g
f
f'
h'
Y'
= (-1Y
+ 17Y
e'
d
Cb'
= (-3Cb
+ 33Cb
e
ab
Cr'
= (-3Cr
+ 33Cr
e
ab
n-2
n-1
n
n-2 n-2' n-1
n-1'
n
Y'
= Y
Y'
=
c
n
Y'
=
n-2
n-1
Y
Y
n-2
n-1
Y'
, Y
, Y
, Y
)
n'
a'
b'
c'
d
Y'
= ƒ(Y
, Y
n-1'
n-2
Y'
= ƒ(Y
, Y
n-2'
n-3
n-2
x
y
z
x
x'
y
y'
z
Y'
= Y
Y'
= Y
Y'
= Y
c
x
x
y
y
z
z
Y'
= (-1Y
+ 17Y
- 1Y
) /32
z'
c
d
Y'
= (-1Y
+ 17Y
y'
x
Y'
= (-1Y
+ 17Y
+ 17Y
- 1Y
x'
w
x
y
Video Output Filtering
+ 17Y
- 1Y
) / 32
e
f
g
+ 101Cb
3Cb
) / 128
cd
ef -
gh
+ 101Cr
3Cr
) / 128
cd
ef -
gh
n
n-1
Trailing edge
n'
replicated pixels
n
= ƒ(Y
, Y
, Y
, Y
n-1
n
n
n-1)
, Y
, Y
)
n-1
n'
n
, Y
, Y
)
n-1'
n
z
y
Trailing edge
z'
replicated luma
+ 17Y
+ 17Y
- 1Y
) /32
y
z
z
y
+ 17Y
- 1Y
) /32
y
z
z
) /32
z
Video Display Port
105
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