H.264 Prediction: Difference between revisions
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(→Diagonal Down/Left: SVQ3 doesn't use this precise mode) |
(add a placeholder for the special SVQ3 4x4 mode) |
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f = (T5 + 2*T6 + T7 + 2) / 4 | f = (T5 + 2*T6 + T7 + 2) / 4 | ||
g = (T6 * 3*T7 + 2) / 4 | g = (T6 * 3*T7 + 2) / 4 | ||
=== Diagonal Down/Left (SVQ3) === | |||
=== Diagonal Down/Right === | === Diagonal Down/Right === |
Revision as of 16:49, 29 July 2007
This page documents the various prediction methods used in H.264 and related formats such as Sorenson Video 3 and RealVideo 4.
4x4 Prediction Modes
Vertical
- H.264: mode 0
- SVQ3: mode 0
- RV40: mode 0
D | T0 T1 T2 T3 --------------------- L0 | T0 T1 T2 T3 L1 | T0 T1 T2 T3 L2 | T0 T1 T2 T3 L3 | T0 T1 T2 T3
Horizontal
- H.264: mode 1
- SVQ3: mode 1
- RV40: mode 1
D | T0 T1 T2 T3 --------------------- L0 | L0 L0 L0 L0 L1 | L1 L1 L1 L1 L2 | L2 L2 L2 L2 L3 | L3 L3 L3 L3
DC
- H.264: mode 2
- SVQ3: mode 2
- RV40: mode 2
D | T0 T1 T2 T3 --------------------- L0 | Z Z Z Z L1 | Z Z Z Z L2 | Z Z Z Z L3 | Z Z Z Z
where Z is computed as:
Z = (T0 + T1 + T2 + T3 + L0 + L1 + L2 + L3 + 4) / 8
Diagonal Down/Left
- H.264: mode 3
- SVQ3: not used
- RV40: mode 3
D | T0 T1 T2 T3 T4 T5 T6 T7 ------------------------------------- L0 | a b c d L1 | b c d e L2 | c d e f L3 | d e f g
where:
a = (T0 + 2*T1 + T2 + 2) / 4 b = (T1 + 2*T2 + T3 + 2) / 4 c = (T2 + 2*T3 + T4 + 2) / 4 d = (T3 + 2*T4 + T5 + 2) / 4 e = (T4 + 2*T5 + T6 + 2) / 4 f = (T5 + 2*T6 + T7 + 2) / 4 g = (T6 * 3*T7 + 2) / 4