Graphics Reference
In-Depth Information
Fig. 3.2
720 luma samples into macro-
blocks and coding tree units: (
a
) Partitioning of the picture into 16
Illustration of the partitioning of a picture with 1280
16 macroblocks as found
in all prior video coding standards of the ITU-T and ISO/IEC; (
b
) Partitioning of the picture into
64
64 coding tree units, the largest coding tree unit size supported in the Main profile of HEVC
luma samples. Larger CTU sizes
3
typically provide better coding efficiency, but
may also increase the encoder/decoder delay, the memory requirements, and the
computational complexity of the encoder process. The encoder has the freedom to
choose the CTU size that provides the best trade-off for the targeted application.
For illustration, Fig.
3.2
shows the partitioning of a picture with 1280
720 luma
samples into 16
16 macroblocks and 64
64 CTUs. It can be seen that a 16
16
3
Here and in the following, the CTU size always refers to the corresponding luma CTB size.
