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14th Meeting: Geneva, March 2019 2019-03-20 21:11
CE3-2.1: Intra chroma partitioning and prediction
Authors: Tianyang Zhou Sharp Tomohiro Ikai Sharp
Abstract
This contribution proposes partitioning and prediction modifications to alleviate intra chroma throughput issues. This report shows the following two tests:
Meeting Notes
JVET-N0137 CE3-2.1: Intra chroma partitioning and prediction [T. Zhou, T. Ikai (Sharp)]

This contribution proposes partitioning and prediction modifications to alleviate intra chroma throughput issues. This report shows the following two tests:

Test 1(CE3-2.1.1): 2x2/2x4/4x2 restriction.

Test 2(CE3-2.1.2): CE-3.2.1.1 + DC mode only prediction in small chroma block.

The restriction size is 2x2, 4x2 and 2x4 in all cases.

In Test 1, intra chroma block partitioning in chroma dual tree chroma is restricted to address the longer intra processing pipeline in dual tree cases. Specifically, in this proposal, QT and MTT partitioning for small chroma blocks are disallowed in dual tree as a partition restriction.

In Test 2, DC mode only prediction in small chroma block is proposed to address difficulties in software cases.

  • Test 1(CE3-2.1.1): the overall BD-rate loss is 0.02%/0.37%/0.49% in IO, 0.01%/0.30%/0.36% in RA, 0.00%/0.18%/ 0.15% in LB.
  • Test 2(CE3-2.1.2): the overall BD-rate loss is 0.02%/0.37%/0.49% in IO, 0.10%/0.61%/0.40% in RA, 0.07%/0.66%/ 0.53% in LB.
References:
JVET-M0065
Cited:
JVET-N0023 JVET-N1001 JVET-N1002 JVET-P0013 JVET-P0071 JVET-P0074 JVET-P0075 JVET-P0113 JVET-P0114 JVET-P0115 JVET-P0116 JVET-P0117 JVET-P0118 JVET-P0126 JVET-P0150 JVET-P0151 JVET-P0155 JVET-P0162 JVET-P0168 JVET-P0220 more than 20
ARCHIVE v5 :
CE3-2.1.1_tester.xlsm CE3-2.1.2_tester.xlsm JVET-N0137_r1.docx JVET-N0137_WD_CE3_2.1.1.docx JVET-N0137_WD_CE3_2.1.2.docx ~$ET-N0137.docx
Decisions
Test 2(CE3-2.1.2): the overall BD-rate loss is 0.02%/0.37%/0.49% in IO, 0.10%/0.61%/0.40% in RA, 0.07%/0.66%/ 0.53% in LB.
Citation