US 11,641,479 B2Granted

Video decoding apparatus and video coding apparatus

AssigneeSharp Kabushiki Kaisha

InventorsTianyang Zhou, Tomohiro Ikai, Eiichi Sasaki, Yukinobu Yasugi

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Abstract

In conventional cases that different trees are used between luma and chroma and that luma chroma prediction including multiplication in chroma intra prediction is used, there is a problem in that a processing delay caused by the chroma intra prediction is increased in small blocks. In a case that two different trees are used between luma and chroma, in a case of an 8×8 block in a luma size, 0 is derived without decoding qt_split_cu_flag, and in a case of an 8×4/4×8 block in a luma size, 0 is derived without decoding mtt_split_cu_flag. In a case that the size of a target block is smaller than a prescribed size, a chroma intra mode is derived from any one of DC, leftward prediction, and upward prediction.

Claims3

Dependent claims

A video decoding apparatus configured to decode a picture in a unit being obtained by splitting the picture with a split type of at least one of a QT split, a BT split, and a TT split, wherein

the video decoding apparatus
determines whether a split is allowed for the picture with the BT split and the TT split,
decodes, in a case that the video decoding apparatus determines that a horizontal split is allowed and a vertical split is allowed for the picture regarding the BT split or the TT split, a direction flag of an MT split,
for the BT split, determines, in a case that a tree type is a DUAL_TREE_CHROMA and multiplication of a width and a height of a chroma block size is 16 or less, that the split is not allowed with the BT split, and
for the TT split, decodes, only in a case that the tree type is not the DUAL_TREE_CHROMA or the multiplication of the width and the height of the chroma block size is greater than 32, an mtt_split_cu_binary_flag, and determines, in a case that the tree type is the DUAL_TREE_CHROMA and the multiplication of the width and the height of the chroma block size is 32 or less, that the split is not allowed with the TT split.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/311,302Filed 2 Dec 2019
Priority: JP JP2018-2298647 Dec 2018
Published: US 2022/0021892 A120 Jan 2022
Granted: 2 May 2023
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

H04N 19/44
Methods or arrangements for coding, decoding, compressing or decompressing digital video signals: decoders specially adapted therefor, e.g. video…
H04N 19/11
Selection of coding mode or of prediction mode: among a plurality of spatial predictive coding modes
H04N 19/119
Characterised by the element, parameter or selection affected or controlled by the adaptive coding: adaptive subdivision aspects, e.g. subdivision…
H04N 19/176
The unit being an image region, e.g. an object: the region being a block, e.g. a macroblock