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12th Meeting: Macao, October 2018 2018-10-08 07:29
CE4-related: Generalized bi-prediction improvements combined from JVET-L0197 and JVET-L0296
Authors: Y.-C. Su MediaTek C.-Y. Chen MediaTek Y.-W. Huang MediaTek Shawmin Lei MediaTek Yong He InterDigital J. Luo InterDigital Xiaoyu Xiu InterDigital Y. Ye InterDigital
Abstract
This contribution presents several methods to improve BMS2.1 generalized bi-prediction (GBi), including coding unit (CU) size constraint for GBi, early termination of affine motion estimation for GBi weights conditionally, pre-selection of GBi weight pairs for low-delay pictures in the encoding for 1-pel and 4-pel MVD precision, conditionally skipping bi-prediction search when reference pictures of two lists are the same, skipping RD cost checking for unequal GBi weights based on temporal layer and the POC distance between reference picture and current picture, and changing floating calculation to fixed-point calculation for unequal GBi weights. Moreover one bug fix related to 6-parameter affine motion estimation in GBi is also included. Compared to BMS2.1 with VTM configuration (GBi off), simulation results show that GBi with the proposed improvements and CU size constraint that disables GBi for CU size smaller than 256 luma samples achieves -0.66% BD-rate with 6% encoding time increases and no decoding time increases for RA.
Meeting Notes
JVET-L0646 CE4-related: Generalized bi-prediction improvements combined from JVET-L0197 and JVET-L0296 [Y.-C. Su, C.-Y. Chen, Y.-W. Huang, S.-M. Lei (MediaTek), Y. He, J. Luo, X. Xiu, Y. Ye (InterDigital)] [late]
References:
JVET-L0197 JVET-L0296
Cited:
JVET-L0663 X JVET-L1001 JVET-L1002 JVET-M0002 JVET-M0013 JVET-M0082 JVET-M0086 JVET-M0087 JVET-M0111 JVET-M0117 JVET-M0162 JVET-M0163 JVET-M0164 JVET-M0165 JVET-M0168 JVET-M0170 JVET-M0171 JVET-M0175 JVET-M0176 JVET-M0177 more than 20
ARCHIVE v6 :
JVET-L0646-v1.docx JVET-L0646-v2-clean.docx JVET-L0646-v2.docx JVET-L0646-v3-clean.docx JVET-L0646-v3.docx JVET-L0646-v4-clean.docx JVET-L0646-v4.docx JVET-L0646-v5-clean.docx JVET-L0646-v5.docx JVET-L0646_DraftText.docx JVET-L0646_Presentation.pdf JVET-L0646_Results_Table1.xlsm JVET-L0646_Results_Table2.xlsm
Decisions
JVET-L0646 CE4-related: Generalized bi-prediction improvements combined from JVET-L0197 and JVET-L0296 [Y.-C. Su, C.-Y. Chen, Y.-W. Huang, S.-M. Lei (MediaTek), Y. He, J. Luo, X. Xiu, Y. Ye (InterDigital)] [late]
Citation