公开(公告)号：US20250005804A1

公开(公告)日：2025-01-02

申请号：US18698437

申请日：2022-09-30

Applicant: LG Electronics Inc.

Inventor： Hendry HENDRY ,  Jinwon LEE ,  Jongyeul SUH ,  Seung Hwan KIM

IPC: G06T9/00

Abstract: Provided are a transmission device of point cloud data, a method performed by the transmission device, a reception device, and a method performed by the reception device. The method performed by a reception device of point cloud data according to the present invention comprises the steps of: obtaining a geometry-based point cloud compression (G-PCC) file including the point cloud data; determining whether temporal scalability information of a tile track is present in the G-PCC file; and deriving the temporal scalability information of the tile track on the basis of the temporal scalability information of the tile track being absent, wherein the temporal scalability information of the tile track may be derived on the basis of temporal scalability information of a tile base track in the G-PCC file.

公开(公告)号：US20240364882A1

公开(公告)日：2024-10-31

申请号：US18644040

申请日：2024-04-23

Applicant: LG ELECTRONICS INC.

Inventor： Jie ZHAO ,  Seung Hwan KIM ,  Hendry HENDRY ,  Seethal PALURI

IPC: H04N19/12 ,  H04N19/124 ,  H04N19/159 ,  H04N19/176 ,  H04N19/18 ,  H04N19/186

CPC classification number: H04N19/12 ,  H04N19/124 ,  H04N19/159 ,  H04N19/176 ,  H04N19/18 ,  H04N19/186

Abstract: An image encoding/decoding method and device are provided. An image decoding method performed by an image decoding device according to the present disclosure may comprise the steps of: determining a prediction mode of the current block on the basis of prediction information obtained from a bitstream; on the basis of the prediction mode of the current block, obtaining a flag indicating whether a color space transform is applied to a residual sample of the current block; determining a quantization parameter of the current block on the basis of the flag; and determining a transform coefficient of the current block on the basis of the quantization parameter.

公开(公告)号：US20240333957A1

公开(公告)日：2024-10-03

申请号：US18737886

申请日：2024-06-07

Applicant: LG ELECTRONICS INC.

Inventor： Seethal PALURI ,  Seung Hwan KIM ,  Jie ZHAO

IPC: H04N19/503 ,  H04N19/169 ,  H04N19/176 ,  H04N19/70

CPC classification number: H04N19/503 ,  H04N19/176 ,  H04N19/188 ,  H04N19/70

Abstract: An image encoding/decoding method and apparatus are provided. An image decoding method performed by an image decoding apparatus may comprise parsing weight information specifying a weight for a reference sample from a bitstream according to a weight parameter syntax structure, and decoding a current block by performing inter prediction based on the weight information. The parsing according to the weight parameter syntax structure may comprise obtaining weight number information specifying the number of weight information obtained from the bitstream according to the weight parameter syntax structure and obtaining weight information from the weight parameter syntax structure based on the weight number information.

公开(公告)号：US20240267523A1

公开(公告)日：2024-08-08

申请号：US18441587

申请日：2024-02-14

Applicant: LG ELECTRONICS INC.

Inventor： Hendry HENDRY ,  Seung Hwan KIM ,  Seethal PALURI ,  Jie ZHAO

IPC: H04N19/136 ,  H04N19/103 ,  H04N19/186 ,  H04N19/70 ,  H04N19/82

CPC classification number: H04N19/136 ,  H04N19/103 ,  H04N19/186 ,  H04N19/70 ,  H04N19/82

Abstract: An image encoding/decoding method and apparatus for signaling a high level syntax (HLS) and a method of transmitting a bitstream are provided. An image decoding method according to the present disclosure may include obtaining first information indicating whether to constrain luma mapping with chroma scaling (LMCS), obtaining second information indicating whether LMCS for a current video sequence is allowed, and reconstructing a current picture within the current video sequence based on the second information. A value of the second information may be determined based on a value of the first information.

公开(公告)号：US20240163473A1

公开(公告)日：2024-05-16

申请号：US18418021

申请日：2024-01-19

Applicant: LG Electronics Inc.

Inventor： Hendry HENDRY ,  Seethal PALURI ,  Seung Hwan KIM

IPC: H04N19/577 ,  H04N19/109 ,  H04N19/139 ,  H04N19/172 ,  H04N19/176 ,  H04N19/52 ,  H04N19/96

CPC classification number: H04N19/577 ,  H04N19/109 ,  H04N19/139 ,  H04N19/172 ,  H04N19/176 ,  H04N19/52 ,  H04N19/96

Abstract: An image encoding/decoding method and apparatus are provided. An image decoding method includes obtaining inter prediction information of a current block and wraparound information from a bitstream, and generating a prediction block of the current block based on the inter prediction information and the wraparound information. The wraparound information may include a first flag specifying whether wraparound motion compensation is enabled for a current video sequence including the current block. The first flag may have a first value specifying that the wraparound motion compensation is disabled, based on that one or more subpicture, which is coded independently and has a width different from a width of a current picture, is present in the current video sequence.

公开(公告)号：US20240121391A1

公开(公告)日：2024-04-11

申请号：US18525067

申请日：2023-11-30

Applicant: LG ELECTRONICS INC.

Inventor： Jie ZHAO ,  Seung Hwan KIM ,  Hendry HENDRY ,  Seethal PALURI

IPC: H04N19/124 ,  H04N19/132 ,  H04N19/176 ,  H04N19/18 ,  H04N19/186 ,  H04N19/60 ,  H04N19/70

CPC classification number: H04N19/124 ,  H04N19/132 ,  H04N19/176 ,  H04N19/18 ,  H04N19/186 ,  H04N19/60 ,  H04N19/70

Abstract: Provided are an image encoding/decoding method and device. An image decoding method performed by an image decoding device according to the present disclosure includes the steps of: determining a quantization parameter of the current block on the basis of whether color space conversion is applied to a residual sample of the current block; determining a transform coefficient of the current block on the basis of the quantization parameter; determining the residual sample of the current block by using the transform coefficient; and resetting the value of the residual sample on the basis of whether the color space conversion is applied.

公开(公告)号：US20230224470A1

公开(公告)日：2023-07-13

申请号：US18008619

申请日：2021-06-11

Applicant: LG Electronics Inc.

Inventor： Hendry HENDRY ,  Hyeong Moon JANG ,  Jaehyun LIM ,  Nae Ri PARK ,  Seung Hwan KIM

IPC: H04N19/136 ,  H04N19/159 ,  H04N19/169 ,  H04N19/172

CPC classification number: H04N19/136 ,  H04N19/159 ,  H04N19/188 ,  H04N19/172

Abstract: An image encoding/decoding method and apparatus is provided. The image decoding method comprises determining whether first information specifying a value of a picture order count (POC) most significant bit (MSB) cycle of a current picture is present in a picture header, determining a POC MSB of the current picture based on whether the first information is present in the picture header, and deriving a POC of the current picture based on the determined POC MSB. Based on the first information being not present in the picture header and the current picture being not a CLVSS (coded layer video sequence start) picture, a POC difference between the current picture and a previous picture preceding the current picture in decoding order may be less than half a maximum value of a POC least significant bit (LSB) of the current picture.

公开(公告)号：US20230119780A1

公开(公告)日：2023-04-20

申请号：US17987732

申请日：2022-11-15

Applicant: LG ELECTRONICS INC.

Inventor： Jangwon CHOI ,  Jin HEO ,  Sunmi YOO ,  Jungah CHOI ,  Seung Hwan KIM

IPC: H04N19/11 ,  H04N19/105 ,  H04N19/136 ,  H04N19/159 ,  H04N19/176 ,  H04N19/186

Abstract: An image encoding/decoding method and apparatus are provided. An image decoding method performed by an image decoding apparatus may include identifying a prediction mode of a current block, determining a candidate intra prediction mode for the current block, based on a prediction mode of a neighboring block located around the current block, based on the intra prediction mode of the current block being an intra prediction mode, generating a candidate intra prediction mode list of the current block based on the candidate intra prediction mode, and determine an intra prediction mode of the current block based on the candidate intra prediction mode list. In this case, the candidate intra prediction mode may be determined to be a predetermined intra prediction mode, based on the prediction mode of the neighboring block being an MIP mode.

公开(公告)号：US20230036189A1

公开(公告)日：2023-02-02

申请号：US17939621

申请日：2022-09-07

Applicant: LG ELECTRONICS INC.

Inventor： Hendry HENDRY ,  Seung Hwan KIM ,  Seethal PALURI

IPC: H04N19/136 ,  H04N19/174 ,  H04N19/172

Abstract: Disclosed herein are an image encoding/decoding method and apparatus. An image decoding method performed by an image encoding apparatus may include acquiring size information indicating a size of a current slice corresponding to at least a portion of a current picture from a bitstream and determining the size of the current slice based on the size information.

公开(公告)号：US20220337842A1

公开(公告)日：2022-10-20

申请号：US17639837

申请日：2020-09-09

Applicant: LG Electronics Inc.

Inventor： Nae Ri PARK ,  Jung Hak NAM ,  Hyeong Moon JANG ,  Seung Hwan KIM

IPC: H04N19/132 ,  H04N19/137 ,  H04N19/159 ,  H04N19/176

Abstract: An image encoding/decoding method and apparatus are provided. An image decoding method according to the present disclosure is performed by an image decoding apparatus. The image decoding method may comprise deriving a prediction sample of a current block based on motion information of the current block, determining whether bi-directional optical flow (BDOF) applies to the current block, based on that the BDOF applies to the current block, deriving a gradient for a current subblock in the current block, deriving motion refinement (vx, vy) for the current subblock based on the gradient, deriving a BDOF offset based on the gradient and the motion refinement, and deriving a refined prediction sample for the current block based on the prediction sample of the current block and the BDOF offset.