6.2.6SCE5 related (inter-layer syntax prediction)
JCTVC-M0066 Non-SCE5: On the effectiveness of temporal and multiple base layer co-located motion vector prediction candidates [Y. H. Tan, C. Yeo (I2R)]
This contribution studies the effectiveness of the temporal motion vector prediction candidates in the enhancement layer when 2 base layer co-located motion vector prediction candidates are included in the merge candidate list in the enhancement layer. The exclusion of the temporal co-located candidate in the enhancement layers is claimed to lead to no coding performance drop on average. This contribution advocates the use of the 2 base layer co-located motion vector as a merge candidates and also the removal of the temporal co-located motion vector prediction candidate in the enhancement layers. In this case, it is asserted that the decoder does not have to retain mode and motion information of reference frames in the enhancement layers, reducing memory requirement.
Suggestion is to disable EL TMVP on top of 5.1.5.2 (the version with 2 BL MVs). The gain of 5.1.5.2 would be reduced to zero, but the EL would save MV memory.
It is interesting to note that the loss by disabling TMVP in context of 5.1.5.2 seems to be less (0.4%) than it would be without 5.1.5.2 (0.6% reported from SCE-5.2.1). Further study (see also under SCE5.2 and M0144).
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