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29th Meeting: by teleconference, DE, January 2023 2023-01-10 18:58
EE2-related: Complexity reduction for Decoder Side Control Point Motion Vector Refinement (test 2.3b)
Authors: M. Bestel Xiaomi Fabrice Le Léannec Xiaomi P. Andrivon Xiaomi Miloš Radosavljević Xiaomi Han Huang Qualcomm Yuhuai Zhang Qualcomm Zixiang Zhang Qualcomm CHUN-CHI CHEN Qualcomm V. Seregim Qualcomm Marta Karczewicz Qualcomm
Abstract
This contribution attempts to optimize the affine DMVR algorithm of test EE2-2.3 that was initially proposed in JVET-AB0178, in terms of trade-off between coding efficiency increase and complexity. It brings several aspects on top of test 2.3b, which are:
Meeting Notes
JVET-AC0276 EE2-related: Complexity reduction for Decoder Side Control Point Motion Vector Refinement (test 2.3b) [M. Bestel, F. Le Léannec, P. Andrivon, M. Radosavljević (Xiaomi), H. Huang, Y. Zhang, Z. Zhang, C.-C. Chen, V. Seregin, M. Karczewicz (Qualcomm)] [late]

This contribution attempts to optimize the affine DMVR algorithm of test EE2-2.3 that was initially proposed in JVET-AB0178, in terms of trade-off between coding efficiency increase and complexity. It brings several aspects on top of test 2.3b, which are:

  • Distortion based early termination
  • 6-parameters affine model early termination
  • Affine DMVR usage according to CU size and shape
  • Adaptation of affine DMVR merge candidate list construction

The proposed modification of top of test EE2-2.3 reportedly leads to the following BD-rates and runtimes relative to ECM-7.0 anchor.

The proposed method reportedly leads to the following BD-rate performances over ECM-7.0 anchors.

RA : XXX% / -XXX% / -XXX% (Y/Cb/Cr). Runtime : XXX% (Enc), XXX% (Dec)

From the partial results shown, about 2/3 of the gain from 2.3b is retained, while the increase in encoder/decoder run time is reduced to about 1/3. From the current results, this would not be a reasonable tradeoff yet.

Further improvements are foreseen by proponents.

It was agreed to investigate this in an EE.

It was noted that another proposal that could be further investigated in a next EE might be 2.4c for which the results were not complete by the time of current EE review.

Cited:
JVET-AC0300 X
ARCHIVE :
JVET-AC0276-0.1.docx JVET-AC0276-0.1.xlsm
Decisions
noted
It was noted that another proposal that could be further investigated in a next EE might be 2.4c for which the results were not complete by the time of current EE review.
Citation