RESTRICTION ON SUB-BLOCK SIZE DERIVATION FOR AFFINE INTER PREDICTION

WIPO Patent Application WO/2019/056839

A1

A video coding device selects a current block for sub-block based affine inter-prediction, and derives a sub-block size for a sub-block of the current block. The sub-block size includes a sub-block width and a sub-block height. The device determines a unidirectional width threshold (TwU), a bidirectional width threshold (TwB), a unidirectional height threshold (ThU), and a bidirectional height threshold (ThB), where a total value of TwB and ThB exceeds a total value of TwU and ThU. The device determines that the affine inter-prediction is unidirectional inter-prediction or bidirectional inter-prediction. Based on the determination, the device applies the TwU or the TwB to the sub-block width, and applies the ThU or the ThB to the sub-block height. The device then derives a motion vector for the sub-block based on motion vectors for the current block, the sub-block width, and the sub-block height.

JP2013005400	INFORMATION PROCESSOR, INFORMATION PROCESSING METHOD, PROGRAM AND RECORDING MEDIUM
WO/2020/172345	METHODS AND APPARATUS OF MOTION VECTOR ROUNDING, CLIPPING AND STORAGE FOR INTER PREDICTION BASED ON MANTISSA-EXPONENT REPRESENTATIONS
WO/2021/040876	METHOD AND APPARATUS FOR VIDEO CODING

CHEN HUANBANG (CN)
YANG HAITAO (CN)
GAO SHAN (CN)
ZHAO YIN (CN)
ZHOU JIANTONG (CN)
LIU SHAN (US)

PCT/CN2018/095910

March 28, 2019

July 17, 2018

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HUAWEI TECH CO LTD (CN)

H04N19/105

WO2016009587A1

2016-01-21

CN106559669A	2017-04-05
CN103931184A	2014-07-16
CN105075259A	2015-11-18
CN104980762A	2015-10-14
CN106303543A	2017-01-04

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