| JCTVC-O0057 MV-HEVC/SHVC: On support of different luma CTB sizes for different layers [T. Yamamoto, T. Ikai, T. Tsukuba (Sharp)]
Discussed Sun morning (GJS).
This contribution provides complexity analysis on supporting different luma coding tree block sizes between layers. Additionally, this contribution proposes options of restrictions on luma coding tree block size relationship between layers for the purpose of providing a start point for the planning of determining how SHVC or MV-HEVC specification will handle it.
It was remarked that our SHM software does not support differing CTB sizes in different layers.
In the initial discussion, it was tentatively agreed that the base layer CTB size should be required to be less than or equal to the enhancement layer CTB size for the scalable cases, and that for the multiview and SNR scalability cases, they must be equal.
This was further discussed further Thu 31st (GJS):
According to a BoG report N0374 of the last meeting regarding contribution N0158, coding efficiency is best with large CTBs for low bit rates and smaller for high bit rates, so there may be a coding efficiency impact of this constraint. Some participants suggested that imposing the constraint would not really make implemenation much simpler. Thus no immediate action was taken. Further study to better understand the potential impact was suggested.
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