公开(公告)号：US20220132109A1

公开(公告)日：2022-04-28

申请号：US17428138

申请日：2020-02-21

Applicant: LG ELECTRONICS INC.

Inventor： Jangwon CHOI ,  Jin HEO ,  Sunmi YOO ,  Jungah CHOI ,  Ling LI

IPC: H04N19/11 ,  H04N19/105 ,  H04N19/132 ,  H04N19/176 ,  H04N19/70 ,  H04N19/119 ,  H04N19/593

Abstract: An image decoding method executed by a decoding apparatus according to the present document comprises the steps of: deriving an intra prediction type for the current block from among the intra prediction types; establishing an intra prediction mode candidate list for the current block by executing a process for establishing an intra prediction mode candidate list; selecting an intra prediction mode for the current block on the basis of the intra prediction mode candidate list; and generating prediction samples for the current block on the basis of the intra prediction type and intra prediction mode.

公开(公告)号：US20220021902A1

公开(公告)日：2022-01-20

申请号：US17299630

申请日：2019-11-27

Applicant: LG ELECTRONICS INC.

Inventor： Jangwon CHOI ,  Jin HEO ,  Sunmi YOO ,  Ling LI ,  Jungah CHOI ,  Seunghwan KIM

IPC: H04N19/593 ,  H04N19/186 ,  H04N19/105 ,  H04N19/11

Abstract: An image decoding method according to the present document includes: a step for deriving a luma intra prediction mode; and a step for generating a chroma candidate mode list for a chroma block including a preset number of chroma intra candidates by using at least one among a DM, a planar mode, a DC mode, a vertical mode, a horizontal mode, and an up-right diagonal mode, which are derived from the luma intra prediction mode, wherein the DM is a prediction mode corresponding to a center (CR) position of the luma block, and the chroma intra candidates other than the DM can be derived through a duplicate check of the DM and a prediction mode corresponding to any one among the top left (TL), top right (TR), bottom left (BL), and bottom right (BR) of the luma block, the planar mode, the DC mode, the vertical mode, and the horizontal mode.

公开(公告)号：US20220021882A1

公开(公告)日：2022-01-20

申请号：US17294943

申请日：2019-11-27

Applicant: LG ELECTRONICS INC.

Inventor： Sunmi YOO ,  Jungah CHOI ,  Seunghwan KIM ,  Jin HEO ,  Jangwon CHOI ,  Jaehyun LIM ,  Ling LI

IPC: H04N19/132 ,  H04N19/105 ,  H04N19/46 ,  H04N19/186 ,  H04N19/169 ,  H04N19/176

Abstract: An image decoding method according to the present document may include: a step for determining whether a current block is a dual-tree type in which individual division structures are applied to a luma component block and a chroma component block of the current block; a step for determining whether the current block is the luma component block to which the dual-tree type is applied, when the current block is determined to be the dual-tree type; a step for parsing a transform skip flag indicating whether a transform skip is applied to the luma component block, when the current block is the luma component block; a step for deriving whether a transform skip is applied to the chroma component block according to a preset condition, when the current block is not the luma component block; and a step for deriving a residual sample on the basis of the transform skip flag and residual information on the current block.

公开(公告)号：US20210297684A1

公开(公告)日：2021-09-23

申请号：US16325994

申请日：2016-08-19

Applicant: LG ELECTRONICS INC.

Inventor： Naeri PARK ,  Sunmi YOO ,  Junghak NAM ,  Hyeongmoon JANG

IPC: H04N19/44 ,  H04N19/105 ,  H04N19/132 ,  H04N19/159 ,  H04N19/82 ,  H04N19/46 ,  H04N19/176

Abstract: The present invention provides a method for decoding a video signal, which includes: generating a first prediction block according to a prediction mode of a current block; checking the prediction mode of a neighboring block adjacent to the current block; generating a second prediction block based on the prediction mode of the neighboring block; generating a final prediction block by applying a weight to the first prediction block and the second prediction block; and reconstructing the video signal by using the final prediction block.

公开(公告)号：US20210281833A1

公开(公告)日：2021-09-09

申请号：US17257169

申请日：2019-07-02

Applicant: LG ELECTRONICS INC.

Inventor： Jin HEO ,  Seunghwan KIM ,  Junghak NAM ,  Sunmi YOO ,  Ling LI ,  Jaehyun KIM ,  Jangwon CHOI ,  Jungah CHOI

IPC: H04N19/105 ,  H04N19/132 ,  H04N19/176 ,  H04N19/423 ,  H04N19/44

Abstract: Embodiments of the present disclosure provide a method and an apparatus for processing a video signal through intra prediction. A method for processing a video signal according to an embodiment of the present disclosure may include: checking that intra prediction is applied to a current block including a current sample to be predicted; determining a first reference sample value on a first reference location from at least one of samples positioned at an upper horizontal line and a left vertical line adjacent to the current block, based on an intra-prediction direction of the current block; determining a second reference sample value on a second reference location positioned in an opposite direction to the intra-prediction direction from a location of the current sample or the first reference location; determining a distance between the first reference location and the current sample as a first distance and determining a distance between the second reference location and the current sample as a second distance; and generating a prediction value of the current sample using the linear interpolation prediction based on a sample value of the first reference sample, the first distance, a sample value of the second reference sample, and the second distance.

公开(公告)号：US20210211667A1

公开(公告)日：2021-07-08

申请号：US17207162

申请日：2021-03-19

Applicant: LG ELECTRONICS INC.

Inventor： Jungah CHOI ,  Sunmi YOO ,  Yin HEO ,  Seunghwan KIM ,  Jangwon CHOI

IPC: H04N19/122 ,  H04N19/136 ,  H04N19/176 ,  H04N19/196

Abstract: A method for decoding a picture performed by a decoding apparatus according to the present disclosure includes receiving a bitstream including residual information, deriving a quantized transform coefficient for a current block based on the residual information included in the bitstream, deriving a transform coefficient from the quantized transform coefficient based on a dequantization process, deriving a residual sample for the current block by applying an inverse transform to the derived transform coefficient, and generating a reconstructed picture based on the residual sample for the current block.

公开(公告)号：US20200374516A1

公开(公告)日：2020-11-26

申请号：US16769429

申请日：2017-12-04

Applicant: LG Electronics Inc.

Inventor： Jin HEO ,  Junghak NAM ,  Sunmi YOO ,  Jangwon CHOI

IPC: H04N19/11 ,  H04N19/176 ,  H04N19/186 ,  H04N19/61 ,  H04N19/44 ,  H04N19/625

Abstract: An image decoding method performed by a decoding apparatus according to the present disclosure comprises a step of obtaining information on an intra prediction mode of a current chroma block and a transform coefficients, a step of generating a prediction sample based on the intra prediction mode of the current chroma block, a step of generating a residual sample using the transform coefficients of the current chroma block based on the transform information of the corresponding luma block of the current chroma block, and a step of generating a reconstruction sample based on the prediction sample and the residual sample.

公开(公告)号：US20200329236A1

公开(公告)日：2020-10-15

申请号：US16913731

申请日：2020-06-26

Applicant: LG ELECTRONICS INC.

Inventor： Sunmi YOO ,  Jaeho Lee ,  Jangwon Choi ,  Jungdong Seo ,  Jin Heo

IPC: H04N19/11 ,  H04N19/117 ,  H04N19/176 ,  H04N19/82

Abstract: A method by which a decoding device performs image decoding, according to the present invention, comprises the steps of: deriving an intra prediction mode of a current block; deriving neighboring samples including left neighboring samples and upper neighboring samples of the current block; deriving reference samples for prediction of a target sample among the neighboring samples on the basis of the position of the target sample of the current block and the prediction angle of the intra prediction mode; determining an interpolation filter for the target sample; and deriving the prediction sample of the target sample on the basis of the interpolation filter and the reference samples.

公开(公告)号：US20200288146A1

公开(公告)日：2020-09-10

申请号：US15932376

申请日：2016-05-02

Applicant: LG Electronics Inc.

Inventor： Yongjoon JEON ,  Jin HEO ,  Sunmi YOO

IPC: H04N19/159 ,  H04N19/176 ,  H04N19/105 ,  H04N19/117

Abstract: An image processing method based on an intra-prediction mode and an apparatus for the same. Particularly, the method may include deriving an intra-prediction mode of a current block, constructing a reference sample to be used for a prediction of the current block from a neighboring sample of the current block, generating a prediction block of the current block based on the intra-prediction mode by using the reference sample, and performing a post filtering by using an adjacent sample of the prediction sample for each prediction sample in the prediction block.

公开(公告)号：US20200045311A1

公开(公告)日：2020-02-06

申请号：US16339338

申请日：2017-09-28

Applicant: LG ELECTRONICS INC.

Inventor： Sunmi YOO

IPC: H04N19/11 ,  H04N19/176 ,  H04N19/159 ,  H04N19/186 ,  H04N19/196

Abstract: The present invention relates to a method for decoding a chroma block of a video signal, wherein the method comprises: a step of determining whether or not an intra prediction mode of the chroma block is being derived; a step of determining the intra prediction mode of the chroma block by using a prediction mode derivation method when the intra prediction mode of the chroma block is being derived; and a step of decoding the chroma block on the basis of the intra prediction mode of the chroma block, and wherein the prediction mode derivation method comprises: a step of acquiring a template prediction value by using a reference pixel neighboring a predefined template; a step of determining a template prediction mode that minimizes the difference between the predefined template and the template prediction value; and a step of setting the template prediction mode to the intra prediction mode of the chroma block.