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11th Meeting: Ljubljana, July 2018 2018-07-10 15:34
CE4-related: Affine MVD Coding
Authors: Seethal Paluri LGE Mehdi Salehifar LGE S. Kim LGE
Abstract
In this proposal, a new motion vector difference coding (MVD) for Affine Motion Vector Difference (AMVD) is introduced. In affine mode, two control motion vectors are used to derive affine motion vectors for each sub-block. One is motion vector from left top and the other is motion vector from right top. Hence, two MVDs are coded. The proposed method jointly exploits the similarity of the MVD between the MVD from left and MVD from right. It is reported that 0.09% BD-rate saving is observed for Random Access configuration.
Meeting Notes
JVET-K0101 CE4-related: Affine MVD Coding [S. Paluri, M. Salehifar, S. Kim (LGE)]

In this proposal, a new motion vector difference coding (MVD) for Affine Motion Vector Difference (AMVD) is introduced. In affine mode, two control motion vectors are used to derive affine motion vectors for each sub-block. One is motion vector from left top and the other is motion vector from right top. Hence, two MVDs are coded. The proposed method jointly exploits the similarity of the MVD between the MVD from left and MVD from right. It is reported that 0.09% BD-rate saving is observed for Random Access configuration.

It is claimed that the joint coding of component from 2 CPMVs could also be applied to the case of 3 CPMVs.

It is claimed that this method could be combined with the MVD coding in JVET-K0337.

It is commented that affine MVD coding requires coding 2/3 MVs instead of 1 MV, which may need a coding method with higher efficiency.

Further study was encouraged.

References:
JVET-J1010
Cited:
JVET-K0024 X JVET-K0432 X JVET-K0546
ARCHIVE v3 :
JVET-K0101.docx JVET-K0101_BMS.XLSM JVET-K0101_r1.docx JVET_K0101.pptx
Decisions
Further study was encouraged.
Citation