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：US20210360248A1

公开(公告)日：2021-11-18

申请号：US17386261

申请日：2021-07-27

Applicant: LG ELECTRONICS INC.

Inventor： Moonmo KOO ,  Mehdi SALEHIFAR ,  Seunghwan KIM ,  Jaehyun LIM

IPC: H04N19/122 ,  H04N19/159 ,  H04N19/176 ,  H04N19/61

Abstract: Embodiments of the disclosure provide a method and apparatus for processing video signals. An image signal decoding method according to an embodiment of the disclosure comprises the steps of: determining, on the basis of the height and width of a current block, an input length and output length of a non-separable transform; determining a non-separable transform matrix corresponding to the input length and output length of the non-separable transform; and applying the non-separable transform matrix to the current block, wherein, when the height and width of the current block are 4 each, the input length and output length of the non-separable transform are determined to be 8 and 16 respectively.

公开(公告)号：US20210360247A1

公开(公告)日：2021-11-18

申请号：US17059027

申请日：2019-05-31

Applicant: LG ELECTRONICS INC.

Inventor： Moonmo KOO ,  Mehdi SALEHIFAR ,  Seunghwan KIM ,  Jaehyun LIM

IPC: H04N19/122 ,  H04N19/60 ,  H04N19/13 ,  H04N19/176 ,  H04N19/124

Abstract: The present invention provides a method for reconstructing a video signal by using a layered-givens transform, comprising the steps of: generating a transform block by performing entropy decoding and inverse quantization on a current block; performing an inverse secondary transformation on a left top specific area of the transform block by using the layered-givens transform; performing an inverse primary transformation on the block on which the inverse secondary transformation has been performed; and reconstructing the current block by using the block on which the inverse primary transformation has been performed, wherein the layered-givens transform includes a plurality of rotation layers and a permutation matrix.

公开(公告)号：US20210329249A1

公开(公告)日：2021-10-21

申请号：US17349215

申请日：2021-06-16

Applicant: LG Electronics Inc.

Inventor： Moonmo KOO ,  Seunghwan KIM ,  Jaehyun LIM

IPC: H04N19/132 ,  H04N19/30 ,  H04N19/46 ,  H04N19/159 ,  H04N19/18 ,  H04N19/176

Abstract: An image decoding method according to the present document comprises the steps of: receiving a quantized transform coefficient for a target block and a transform index for a non-separable secondary transform; dequantizing the quantized transform coefficients to derive transform coefficients; deriving modified transform coefficients on the basis of a matrix operation of a transform kernel matrix in a transform set indicated by the transform index and a transform coefficient list corresponding to the magnitude of dequantized transform coefficients; clipping the modified transform coefficients to a predetermined range of values; and deriving residual samples for the target block on the basis of an inverse primary transform with respect to the modified transform coefficients clipped.

公开(公告)号：US20210281842A1

公开(公告)日：2021-09-09

申请号：US17258367

申请日：2019-07-03

Applicant: LG ELECTRONICS INC.

Inventor： Moonmo KOO ,  Mehdi SALEHIFAR ,  Seunghwan KIM ,  Jaehyun LIM

IPC: H04N19/122 ,  H04N19/14 ,  H04N19/44 ,  H04N19/625 ,  H04N19/18

Abstract: Embodiments of the present invention provide a video signal processing method and apparatus. The video signal processing method according to an embodiment of the present invention comprises checking a length of a signal to which a transform is to be applied in the video signal, wherein the length of the signal corresponds to a width or height of a current block to which the transform is applied, determining a transform type based on the length of the signal, and applying, to the signal, the transform matrix determined based on the transform type, wherein DST-4 or DCT-4 is determined as the transform type if the length of the signal corresponds to a first length, and wherein DST-7 or DCT-8 is determined as the transform type if the length of the signal corresponds to a second length different from the first length.

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：US20210235119A1

公开(公告)日：2021-07-29

申请号：US15734806

申请日：2019-06-07

Applicant: LG ELECTRONICS INC.

Inventor： Seunghwan KIM ,  Medhi SALEHIFAR ,  Moonmo KOO ,  Jaehyun LIM

IPC: H04N19/61 ,  H04N19/11 ,  H04N19/176 ,  H04N19/593

Abstract: The present disclosure, in a method of decoding a video signal, provides a method including checking whether a transform skip is applied to a current block; acquiring a transform index indicating transform types applied to a horizontal direction and a vertical direction of the current block from among a plurality of predefined transform types from the video signal when the transform skip is not applied to the current block; and performing an inverse primary transform on the current block using the transform types indicated by the transform index, wherein the transform types applied to the horizontal direction and the vertical direction of the current block are determined from among transform types defined according to an intra prediction mode of the current block based on the transform index.

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：US20210203984A1

公开(公告)日：2021-07-01

申请号：US17044590

申请日：2019-03-22

Applicant: LG Electronics Inc.

Inventor： Mehdi SALEHIFAR ,  Seunghwan KIM

IPC: H04N19/593 ,  H04N19/176 ,  H04N19/11 ,  H04N19/132 ,  H04N19/174

Abstract: A method for decoding an image by a decoding apparatus according to the present disclosure comprises the steps of: acquiring intra prediction mode information of a current block; rearranging the remaining intra prediction modes on the basis of a lookup table; deriving a subgroup of the current block on the basis of subgroup information; decoding remaining intra prediction mode information on the basis of a binarization method for the subgroup; deriving, as an intra prediction mode of the current block, an intra prediction mode indicated by the decoded remaining intra prediction mode information among the intra prediction modes included in the subgroup; and generating a prediction sample of the current block on the basis of the intra prediction mode.

公开(公告)号：US20210099710A1

公开(公告)日：2021-04-01

申请号：US17044570

申请日：2019-03-27

Applicant: LG Electronics Inc.

Inventor： Mehdi SALEHIFAR ,  Seunghwan KIM

IPC: H04N19/132 ,  H04N19/117 ,  H04N19/82 ,  H04N19/46 ,  H04N19/176 ,  G06N3/02

Abstract: A method for image decoding performed by a decoding apparatus, according to the present disclosure, comprises the steps of: obtaining residual information for a current block from a bitstream; deriving a prediction sample for the current block; deriving a residual sample for the current block on the basis of the residual information; deriving a reconstructed picture on the basis of the prediction sample and the residual sample; and performing filtering on the reconstructed picture on the basis of a convolution neural network (CNN).