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12th Meeting: Macao, October 2018 2018-10-12 06:31
CE1.2.1: Constraint for binary and ternary partitions
Authors: Chia-Ming Tsai MediaTek C.-W. Hsu MediaTek T.-D. Chuang MediaTek C.-Y. Chen MediaTek Y.-W. Huang MediaTek Shawmin Lei MediaTek
Abstract
Virtual pipeline data units (VPDUs) are defined as non-overlapping MxM-luma(L)/NxN-chroma(C) units in a picture. In hardware decoders, successive VPDUs are processed by multiple pipeline stages at the same time; different stages process different VPDUs simultaneously. The VPDU size is roughly proportional to the buffer size in most pipeline stages, so it is very important to keep the VPDU size small. In HEVC hardware decoders, the VPDU size is set to maximum transform block (TB) size. Enlarging maximum TB size from 32x32-L/16x16-C (as in HEVC) to 64x64-L/32x32-C (as in the current VVC) can bring coding gains, which results in 4X of VPDU size (64x64-L/32x32-C) expectedly in comparison with HEVC. However, in addition to quadtree (QT) coding unit (CU) partitioning, ternary tree (TT) and binary tree (BT) are adopted in VVC for achieving additional coding gains, and TT and BT splits can be applied to 128x128-L/64x64-C coding tree blocks (CTUs) recursively, which leads to 16X of VPDU size (128x128-L/64x64-C) in comparison with HEVC. To reduce the VPDU size in VVC, one constraint for BT and TT is proposed, and the VPDU size is defined as 64x64-L/32x32-C for the following.
Meeting Notes
JVET-L0081 CE1.2.1: Constraint for binary and ternary partitions [C.-M. Tsai, C.-W. Hsu, T.-D. Chuang, C.-Y. Chen, Y.-W. Huang, S.-M. Lei (MediaTek)]
References:
JVET-K1001 JVET-K1010
Cited:
JVET-L0021 X JVET-L0509 X JVET-L1001 JVET-L1002 JVET-L1021 JVET-M0002 JVET-M0021 X JVET-M0071 JVET-M0073 JVET-M0082 JVET-M0086 JVET-M0087 JVET-M0117 JVET-M0162 JVET-M0163 JVET-M0164 JVET-M0165 JVET-M0168 JVET-M0170 JVET-M0171 more than 20
ARCHIVE v4 :
JVET-L0081-v1.docx JVET-L0081-v2-clean.docx JVET-L0081-v2.docx JVET-L0081_DraftText.docx JVET-L0081_Presentation.pdf JVET-L0081_Results_Table1_CE1.2.1.1.xlsm JVET-L0081_Results_Table1_CE1.2.1.2.xlsm JVET-L0081_Results_Table2_CE1.2.1.3.xlsm JVET-L0081_Results_Table2_CE1.2.1.4.xlsm
Decisions
JVET-L0081 CE1.2.1: Constraint for binary and ternary partitions [C.-M. Tsai, C.-W. Hsu, T.-D. Chuang, C.-Y. Chen, Y.-W. Huang, S.-M. Lei (MediaTek)]
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