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16th Meeting: Geneva, October 2019 2019-10-05 11:23
CE4-related: On MVD derivation in PROF
Authors: H. Liu ByteDance Li Zhang ByteDance Kai Zhang ByteDance Yifan Wang ByteDance Jizheng Xu ByteDance Yifan Wang ByteDance
Abstract
In PROF, MVD is derived for each position in a 4×4 block. Theoretically, for a pair of symmetrical positions relative to the center of the 4×4 block, the derived MVD values should have the same magnitudes but with opposite sign flags. This contribution proposes to derive the MVD for only half of the positions and use their opposite values for the other half positions. To achieve this, the clipped range of MVD is also modified to be within [-2N + 1, 2N - 1]. It is asserted that nearly 50% of the computations in the MVD derivation process can be saved. Simulation results reportedly show that the proposed method has negligible impact on the coding performance, 0.01% and -0.03% BD rate changes under RA and LDB, respectively.
Meeting Notes
JVET-P0491 CE4-related: On MVD derivation in PROF [H. Liu, L. Zhang, K. Zhang, Y. Wang, J. Xu, Y. Wang (Bytedance)]
References:
JVET-N1010 JVET-O2001 JVET-P0047
Cited:
JVET-P0024 JVET-P0745 X JVET-P2001 JVET-Q0002 JVET-Q0003 JVET-Q0013 JVET-Q0041 JVET-Q0085 JVET-Q0097 JVET-Q0124 JVET-Q0125 JVET-Q0132 JVET-Q0148 JVET-Q0165 JVET-Q0168 JVET-Q0173 JVET-Q0175 JVET-Q0184 JVET-Q0185 JVET-Q0188 more than 20
PATENTS:
20220103827 0.34 WO/2020/228836 0.33 20230403398 0.32 202127049277 0.31 20230308641 0.30 20230046994 0.28 20240089483 0.27 WO/2021/073488 0.26
ARCHIVE v2 :
JVET-P0491-CE4-2.1.xlsm JVET-P0491.docx JVET-P0491.pptx JVET-P0491.xlsm JVET-P0491_Spec.docx
Decisions
JVET-P0491 CE4-related: On MVD derivation in PROF [H. Liu, L. Zhang, K. Zhang, Y. Wang, J. Xu, Y. Wang (Bytedance)]
Citation