US 11,910,011 B2Granted

Intra prediction-based image decoding method and device therefor in image coding system

AssigneeLG Electronics Inc.

InventorsJangwon Choi, Jin Heo, Seunghwan Kim, Jaehyun Lim, Ling Li

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Abstract

An image decoding method performed by a decoding device according to the present document comprises the steps of: deriving an intra prediction type for a current block from among intra prediction types; constituting an intra prediction mode candidate list of the current block on the basis of intra prediction modes of neighboring blocks of the current block; deriving an intra prediction mode of the current block on the basis of the intra prediction mode candidate list; and generating prediction samples of the current block on the basis of the intra prediction type and the intra prediction mode.

Claims11

Dependent claims

An image decoding method performed by a decoding apparatus, comprising:

deriving an intra prediction type for a current block as Multi Reference Line intra prediction (MRL), wherein the MRL is an intra prediction type based on an intra prediction reference line not adjacent to the current block;
constructing an intra prediction mode candidate list including a DC intra prediction mode based on intra prediction modes of neighboring blocks of the current block;
deriving an intra prediction mode of the current block based on the intra prediction mode candidate list;
and
generating a prediction sample of the current block based on the intra prediction type and the intra prediction mode,
wherein based on the intra prediction mode of the current block being derived as the DC intra prediction mode, and a width of the current block being equal to a height of the current block, a DC value is derived based on an equation as follows:
deVal
=
(
∑
x
′
=
0
nTbW
-
1
p
[
x
′
]
[
-
1
-
refIdx
]
+
∑
y
′
=
0
nTbH
-
1
p
[
-
1
-
refIdx
]
[
y
′
]
+
nTbW
)
≫
(
Log
⁢
2
⁢
(
nTbW
)
+
1
)
where dcVal represent the DC value and nTbW represent the width of the current block, and refIdx is a value of a reference line index for the intra prediction reference line, and the prediction sample is derived as the DC value.

61 more elements

An image encoding method performed by an encoding apparatus, comprising:

deriving an intra prediction type for a current block as Multi Reference Line intra prediction (MRL), wherein the MRL is an intra prediction type based on an intra prediction reference line not adjacent to the current block;
constructing an intra prediction mode candidate list including a DC intra prediction mode based on intra prediction modes of neighboring blocks of the current block;
deriving an intra prediction mode of the current block based on the intra prediction mode candidate list;
generating a prediction sample of the current block based on the intra prediction type and the intra prediction mode;
and
encoding image information including prediction related information for the current block,
wherein based on the intra prediction mode of the current block being derived as the DC intra prediction mode, and a width of the current block being equal to a height of the current block, a DC value is derived based on an equation as follows:
deVal
=
(
∑
x
′
=
0
nTbW
-
1
p
[
x
′
]
[
-
1
-
refIdx
]
+
∑
y
′
=
0
nTbH
-
1
p
[
-
1
-
refIdx
]
[
y
′
]
+
nTbW
)
≫
(
Log
⁢
2
⁢
(
nTbW
)
+
1
)
where dcVal represent the DC value and nTbW represent the width of the current block, and refIdx is a value of a reference line index for the intra prediction reference line, and the prediction sample is derived as the DC value.

62 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/441,759Filed 18 Mar 2020 · us provisional application
Priority: 22 Mar 2019
Published: US 2022/0182663 A19 Jun 2022
Granted: 20 Feb 2024
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

H04N 19/117
Characterised by the element, parameter or selection affected or controlled by the adaptive coding: filters, e.g. for pre-processing or…
H04N 19/593
Using predictive coding: involving spatial prediction techniques
H04N 19/105
Selection of coding mode or of prediction mode: selection of the reference unit for prediction within a chosen coding or prediction mode, e.g.…
H04N 19/11
Selection of coding mode or of prediction mode: among a plurality of spatial predictive coding modes

Family

Application62/822,739Us provisional application · filed 22 Mar 2019
US 2022/0182663 A1Pre-grant publication · published 9 Jun 2022
US 11,910,011 B2This patent

From the US filing history. Foreign family members aren’t listed.

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