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13th Meeting: Marrakech, January 2019 2018-12-28 08:15
Non-CE4: MMVD scaling fix
Authors: E. Sasaki Sharp Tomohiro Ikai Sharp
Abstract
This contribution proposes a fix on MMVD motion vector calculation. VTM3.0 MMVD flips / scales the motion vector difference (MVD) two times, i.e. with POC direction and with POC distance between L0 and L1 reference picture. This two time scaling creates the case where not mirrored motion vector is used (when the POC direction is mirrored and POC distance is different) while MMVD uses mirrored motion vectors in other most cases. This two time scaling causes confusions and it is reported this non mirrored motion usage is not efficient.
Meeting Notes
JVET-M0068 Non-CE4: MMVD scaling fix [E. Sasaki, T. Ikai (Sharp)]

Notes from BoG report review: -0.02%/0.00%, remove redundant scaling, makes it identical with regular MV scaling.

JVET-M0068 Non-CE4: MMVD scaling fix [E. Sasaki, T. Ikai (Sharp)]

Notes from BoG report review: -0.02%/0.00%, remove redundant scaling, makes it identical with regular MV scaling.

References:
JVET-L0054 JVET-L1010
Cited:
JVET-M0024 JVET-M0509 X JVET-N0003 JVET-N0013
PATENTS:
US11665339B2 0.76 2023-05-30 CN114600462B 0.70 2026-01-20 US12034951B2 0.32 2024-07-09 US12238320B2 0.30 2025-02-25 US12418674B2 0.28 2025-09-16 CN114270864B 0.24 2025-03-18 JP7744822B2 0.22 2025-09-26 CN117280687B 0.20 2026-03-10
ARCHIVE v1 :
JVET-L1001-v7_proposed.docx JVET-M0068.docx JVET-M0068.pptx JVET-M0068.xlsm
Decisions
JVET-M0068 Non-CE4: MMVD scaling fix
Notes from BoG report review: -0.02%/0.00%, remove redundant scaling, makes it identical with regular MV scaling.
Citation