Texas Instruments TMS320C64x DSP - Manual (Page 169)

Video Output Filtering
Video Display Port 4-24 SPRU629
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 a’ b b’ c
a
y’ z z’ x x’ y
a b c z x y
Horizontal Image Size
Leading edge
replicated luma
Trailing edge
replicated luma
z y
Y’a = Ya Y’b = Yb Y’c = Yc Y’x = Yx Y’y= Yy Y’z = Yz
Y’a’ = (–1Ya + 17Ya + 17Yb – 1Yc) /32
Y’b’ = (–1Ya + 17Yb + 17Yc – 1Yd) /32 Y’z’ = (–1Yy + 17Yz + 17Yz – 1Yy) /32
Y’y’ = (–1Yx + 17Yy + 17Yz – 1Yz ) /32
Y’x’ = (–1Yw + 17Yx + 17Yy – 1Yz ) /32
Figure 4–24. Interspersed Chroma Edge Replication
a a’ b b’ c c’ d w w’ x x’
a b c d w x y
y
Cb’a = (–3Cbcd + 33Cbab + 101Cbab –3Cbcd)/128
Cr’a = (–3Crcd + 33Crab + 101Crab –3Crcd)/128
y’
ab cd z
Horizontal Image Size
Trailing edge
replicated chroma
samples
wx yz
z z’
yz wx ab cd
Cb’b = (–3Cbab + 101Cbab + 33Cbcd –3Cbef)/128
Cr’b = (–3Crab + 101Crab + 33Crcd –3Cref)/128
Cb’c = (–3Cbab + 33Cbab + 101Cbcd –3Cbef)/128
Cr’c = (–3Crab + 33Crab + 101Crcd –3Cref)/128
Cb’d = (–3Cbab + 101Cbcd + 33Cbef –3Cbgh)/128
Cr’d = (–3Crab + 101Crcd + 33Cref –3Crgh)/128
Cb’w = (–3Cbst + 33Cbuv + 101Cbwx –3Cbyz)/128
Cr’w = (–3Crst + 33Cruv + 101Crwx –3Cryz)/128
Cb’x = (–3Cbuv + 101Cbwx + 33Cbyz –3Cbyz)/128
Cr’x = (–3Cruv + 101Crwx + 33Cryz –3Cryz)/128
Cb’y = (–3Cbuv + 33Cbwx + 101Cbyz –3Cbyz)/128
Cr’y = (–3Cruv + 33Crwx + 101Cryz –3Cbyz)/128
Cb’z = (–3Cbwx + 101Cbyz + 33Cbyz –3Cbwz)/128
Cr’z = (–3Crwx + 101Cryz + 33Cryz –3Cbwx)/128
Leading edge
replicated chroma
samples