#925 closed defect (fixed)

confusing range of sps_log2_diff_min_qt_min_cb_intra_slice_chroma and ph_log2_diff_min_qt_min_cb_intra_slice_chroma

Reported by: hanhuang Owned by:
Priority: minor Milestone:
Component: spec Version: VVC D8 vB
Keywords: Cc: ksuehring, bbross, XiangLi, fbossen, jvet@…

Description

The ranges of sps_log2_diff_min_qt_min_cb_intra_slice_chroma and ph_log2_diff_min_qt_min_cb_intra_slice_chroma are both "0 to CtbLog2SizeY − MinCbLog2SizeY, inclusive". It means that the minimum QT size for chroma tree can be (1<<CtbLog2SizeY) and can be 128. Therefore, the max TT and BT size for chroma tree can also be set to 128. However, implicit QT split is applied to dual tree when CU size is larger than 64.
Suggest to modify the range to:

0 to min(6,CtbLog2SizeY) − MinCbLog2SizeY, inclusive

Change history (2)

comment:1 Changed 19 months ago by yk

It'd be great if experts in this area can confirm the bug and the suggested fix.

comment:2 Changed 15 months ago by bbross

  • Resolution set to fixed
  • Status changed from new to closed

Thanks for brining that up.

This is fixed in D9 by the adoption of JVET-R0347.

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