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15th Meeting: Gothenburg, SE, July 2019 2019-07-05 08:39
Non-CE9: Restriction on motion vector refinement in BDOF
Authors: H. Liu ByteDance Li Zhang ByteDance Kai Zhang ByteDance Hsiao-Chiang Chuang ByteDance Jizheng Xu ByteDance
Abstract
In Bi-Direction Optical Flow (BDOF), two multiplications per sample are required to derive a sample adjustment. This contribution proposes to restrict the motion vector refinement to be in a form of +2N or -2N (N is an integer). In this way, the two multiplications can be replaced by two shifts when calculating the sample adjustment. Simulation results reportedly show -0.01%, -0.05% and -0.02% BD-rate changing under RA configurations for Y, Cb and Cr component, respectively.
Meeting Notes
JVET-O0573 Non-CE9: Restriction on motion vector refinement in BDOF [H. Liu, L. Zhang, K. Zhang, H.-C. Chuang, J. Xu (Bytedance)]

JVET-O0573 Non-CE9: Restriction on motion vector refinement in BDOF [H. Liu, L. Zhang, K. Zhang, H.-C. Chuang, J. Xu (Bytedance)]

Cited:
JVET-O0819 X
ARCHIVE :
JVET-O00573_spec_Test#2.docx JVET-O00573_spec_Test#3.docx JVET-O00573_Test#2.xlsm JVET-O00573_Test#3.xlsm JVET-O0573.docx JVET-O0573.pdf JVET-O0573.xlsm JVET-O0573_r1.docx JVET-O0573_r2.docx JVET-O0573_spec.docx
Decisions
From Track B discussion: Include this in CE on BDOF/PROF harmonization.
JVET-O0573 Non-CE9: Restriction on motion vector refinement in BDOF [H. Liu, L. Zhang, K. Zhang, H.-C. Chuang, J. Xu (Bytedance)]
Citation