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31st Meeting: Geneva, CH, July 2023 2023-07-12 14:43
AHG12: DBV improvement
Authors: Luhang Xu OPPO Yue Yu OPPO H. Yu OPPO D. Wang OPPO
Abstract
When dual-tree block partition is enabled for an intra slice in ECM9, DBV is one of the chroma coding modes if one of the five corresponding luma positions is coded with either intraTMP or IBC. If the current luma block is coded with IBC or IntraTMP and DBV is not used, this contribution proposes to use one of the prediction modes, i.e., DC, Planar, Horizontal, and Vertical, without the DM flag to code the corresponding chroma block. On top of ECM-9.0, the simulation results are reported as follows:
Meeting Notes
JVET-AE0167 AHG12: DBV improvement [L. Xu, Y. Yu, H. Yu, D. Wang (OPPO)]

When dual-tree block partition is enabled for an intra slice in ECM9, DBV is one of the chroma coding modes if one of the five corresponding luma positions is coded with either intraTMP or IBC. If the current luma block is coded with IBC or IntraTMP and DBV is not used, this contribution proposes to use one of the 5 prediction modes, i.e., DIMD, DC, Planar, Horizontal, and Vertical, without the DM flag to code the corresponding chroma block. On top of ECM-9.0, the simulation results are reported as follows:

  • AI: -0.02% (Y), -0.09% (U), -0.08% (V), xx% (EncT), xx% (DecT)
  • RA: -0.01% (Y), -0.13% (U), -0.01% (V), xx% (EncT), xx% (DecT)

Encoding/decoding times are not reliable,

Somewhat similar approach to JVET-AE0186, but that proposal showed slightly better (though still low) results. Proponents of JVET-AE0186 believe that the two proposals are not overlapping and might give additive gain.

It was agreed to investigate this in the EE.

Cited:
JVET-AE0265 X
ARCHIVE :
JVET-AE0167-v3.docx JVET-AE0167.pptx JVET-AE0167.xlsm
Decisions
It was agreed to investigate this in the EE.
Citation