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Prediction Unit (PU)<br />
CU partitioning into Prediction<br />
partitions is nonrecursive<br />
Intra CUs partitioned into square<br />
Prediction partitions<br />
o 32x32<br />
o 16x16<br />
o 8x8<br />
o 4x4<br />
Inter CU (64x64, 32x32, 16x16, 8x8)<br />
partitioned into<br />
1 of 8 Prediction partition modes<br />
o Partitioned into 1, 2, or 4<br />
partitions<br />
o 8x8 PU is partitioned into<br />
8x4, 4x8 only;<br />
also no bidirectional<br />
prediction mode for 8x8 PUs<br />
Using PU partitions, a residual CU is<br />
constructed prior to coding<br />
Transform Unit (TU)<br />
Residual CU, QuadTree recursively<br />
split into TUs<br />
TUs of following sizes (no 64x64 TU)<br />
o 32x32<br />
o 16x16<br />
o 8x8<br />
o 4x4<br />
Chroma TU of 1/4 th size of luma TU<br />
but smallest<br />
TU for chroma is 4x4 (no 2x2 TUs for<br />
chroma)<br />
TU of size 4x4 flagged by coded/not<br />
coded<br />
DCT Transform on all TU sizes (32x32,<br />
16x16, 8x8, 4x4)<br />
DST Transform on size 4x4 TU<br />
Figure 2C Intra and Inter PU examples<br />
Figure 2D Partitioning of a CU into TUs<br />
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