公开(公告)号：US11350130B2

公开(公告)日：2022-05-31

申请号：US17047849

申请日：2019-04-17

申请人： LG Electronics Inc.

发明人： Moonmo Koo ,  Mehdi Salehifar ,  Seunghwan Kim ,  Jaehyun Lim

IPC分类号： H04N19/00 ,  H04N19/61 ,  H04N19/159 ,  H04N19/176 ,  H04N19/625

摘要： The present invention provides a method for reconstructing a video signal by using an approximation transform on the basis of a preprocessing/postprocessing matrix, the method comprising: obtaining a transform index of a current block from a video signal, wherein the transform index corresponds to any one of a plurality of transform combinations including at least one of DST7, DCT8, DST6, or flipped DST7, and a transform combination includes a horizontal transform and a vertical transform; deriving a primary transform for horizontal/vertical directions corresponding to the transform index; performing an inverse primary approximation transform by using the primary transform for the horizontal/vertical directions, wherein the inverse primary approximation transform is generated by multiplying the primary transform for the horizontal/vertical directions by a preprocessing matrix and a postprocessing matrix; and reconstructing the video signal by using the inverse primary approximation-transformed current block.

公开(公告)号：US11336920B2

公开(公告)日：2022-05-17

申请号：US17209854

申请日：2021-03-23

申请人： LG ELECTRONICS INC.

发明人： Moonmo Koo ,  Seunghwan Kim ,  Mehdi Salehifar ,  Jaehyun Lim

IPC分类号： H04N19/625 ,  H04N19/70 ,  H04N19/132 ,  H04N19/176

摘要： A method for decoding a video signal based on reduced transform includes the steps of: obtaining, from the video signal, a transform index indicating transform kernels applied to horizontal and vertical directions of a current block; determining a region in which a transform is applied to the current block based on the transform kernels indicated by the transform index and a size of the current block; deriving, as zero, coefficients of a remaining region other than the region to which the transform is applied within the current block; and performing an inverse transform on the region to which the transform is applied using the transform kernels indicated by the transform index.

公开(公告)号：US11310531B2

公开(公告)日：2022-04-19

申请号：US17350790

申请日：2021-06-17

申请人： LG Electronics Inc.

发明人： Moonmo Koo ,  Seunghwan Kim ,  Jaehyun Lim

IPC分类号： H04N19/61 ,  H04N19/176 ,  H04N19/159 ,  H04N19/132

摘要： A video decoding method according to the present document is characterized by comprising: a step for deriving transform coefficients through inverse quantization on the basis of quantized transform coefficients for a target block; a step for deriving modified transform coefficients on the basis of an inverse reduced secondary transform (RST) of the transform coefficients; and a step for generating a reconstructed picture on the basis of residual samples for the target block on the basis of an inverse primary transform of the modified transform coefficients, wherein the inverse RST using a transform kernel matrix is performed on transform coefficients of the upper-left 4×4 region of an 8×8 region of the target block, and the modified transform coefficients of the upper-left 4×4 region, upper-right 4×4 region, and lower-left 4×4 region of the 8×8 region are derived through the inverse RST.

公开(公告)号：US11122290B2

公开(公告)日：2021-09-14

申请号：US16773958

申请日：2020-01-27

申请人： LG Electronics Inc.

发明人： Hyeongmoon Jang ,  Eunyong Son ,  Moonmo Koo ,  Seungwook Park ,  Yongjoon Jeon

IPC分类号： H04N19/56 ,  H04N19/176 ,  H04N19/124 ,  H04N19/503 ,  H04N19/105 ,  H04N19/70 ,  H04N19/182 ,  H04N19/513 ,  H04N19/66 ,  H04N19/91

摘要： A video decoding method performed by a decoding apparatus includes the steps of: deriving control points (CP) for a current block; acquiring movement vectors for the CPs; deriving a sample unit movement vector in the current block on the basis of the acquired movement vectors; and deriving a prediction sample for the current block on the basis of the sample unit movement vector. According to the present invention, it is possible to effectively perform, through sample unit motion vectors, inter-prediction not only in a case where an image in the current block is plane-shifted but also in a case where there are various image distortions.

公开(公告)号：US20210203969A1

公开(公告)日：2021-07-01

申请号：US17138722

申请日：2020-12-30

申请人： LG ELECTRONICS INC.

发明人： Mehdi Salehifar ,  Seunghwan Kim ,  Moonmo Koo ,  Jaehyun Lim

IPC分类号： H04N19/44 ,  H04N19/61 ,  H04N19/132 ,  H04N19/159 ,  H04N19/176

摘要： Disclosed is a method for decoding a video signal, including: generating a dequantized transform block by performing dequantization for a current block; acquiring an intra prediction mode of the current block; determining a secondary transform set applied to the current block among a plurality of secondary transform sets based on the intra prediction mode; deriving a transform kernel applied to the current block in the determined secondary transform set; and performing secondary transform for a top left specific area of the dequantized transform block by using the derived transform kernel, in which the plurality of secondary transform sets may include at least one mixed secondary transform set.

公开(公告)号：US11012702B2

公开(公告)日：2021-05-18

申请号：US16898117

申请日：2020-06-10

申请人： LG ELECTRONICS INC.

发明人： Moonmo Koo ,  Mehdi Salehifar ,  Seunghwan Kim ,  Jaehyun Lim

IPC分类号： H04N19/44 ,  H04N19/159 ,  H04N19/176 ,  H04N19/625 ,  H04N19/70

摘要： A method and a device for processing a video signal are disclosed. In particular, a method for decoding a video signal includes parsing a first syntax element indicating a primary transform kernel applied to a primary transform of a current block; determining whether a secondary transform is applicable to the current block based on the first syntax element; if the secondary transform is applicable to the current block, parsing a second syntax element indicating a secondary transform kernel applied to a secondary transform of the current block; deriving a secondary inverse-transformed block, by performing a secondary inverse-transform for a top-left specific region of the current block using a secondary transform kernel indicated by the second syntax element; and deriving a residual block of the current block, by performing a primary inverse-transform for the secondary inverse-transformed block using a primary transform kernel indicated by the first syntax element.

公开(公告)号：US10979736B2

公开(公告)日：2021-04-13

申请号：US16620438

申请日：2018-06-08

申请人： LG ELECTRONICS INC. ,  INDUSTRY-ACADEMIC COOPERATION FOUNDATION, CHOSUN UNIVERSITY

发明人： Moonmo Koo ,  Jaehyun Lim ,  Bumshik Lee

IPC分类号： H04N19/61 ,  H04N19/176 ,  H04N19/625

摘要： The present disclosure provides a method for processing a video signal by using a linear relationship between transform types, the method comprising the steps of: determining a transform group on the basis of a prediction mode of a current block; parsing a transform combination index from the video signal, wherein the transform combination index indicates one of a plurality of transform combinations in the transform group; deriving a transform combination corresponding to the transform combination index, wherein the transform combination includes a horizontal transform and a vertical transform and includes DST-1 or DCT-5; performing inverse transform of the current block on the basis of the transform combination; and reconstructing the video signal by using the inverse-transformed current block.

公开(公告)号：US10523945B2

公开(公告)日：2019-12-31

申请号：US15768294

申请日：2016-10-13

申请人： LG Electronics Inc.

发明人： Moonmo Koo ,  Sehoon Yea ,  Eunyong Son ,  Kyuwoon Kim ,  Jin Heo ,  Junghak Nam ,  Bumshik Lee

IPC分类号： H04B1/66 ,  H04N19/13 ,  H04N19/70 ,  H04N19/172 ,  H04N19/157 ,  H04N19/105 ,  H04N19/14 ,  H04N19/176 ,  H04N19/11

摘要： The present invention provides a method for encoding a video signal comprising the steps of: obtaining activity information from the video signal, wherein the activity signal indicates information relating to edge characteristics of an image and includes edge orientation information and/or edge level information; determining conditionally non-linear transform (CNT) configuration information on the basis of the activity information; and performing CNT prediction coding on the basis of the CNT configuration information, wherein the CNT prediction coding involves performing prediction using all previously decoded pixel values.

公开(公告)号：US10469838B2

公开(公告)日：2019-11-05

申请号：US15758920

申请日：2016-09-12

申请人： LG ELECTRONICS INC.

发明人： Bumshik Lee ,  Sehoon Yea ,  Moonmo Koo

IPC分类号： H04N19/105 ,  H04N19/176 ,  H04N19/61 ,  H04N19/11 ,  H04N19/182 ,  H04N19/90 ,  H04N19/107 ,  H04N19/122 ,  H04N19/18 ,  H04N19/159 ,  H04N19/134 ,  H04N19/12 ,  H04N19/463 ,  H04N19/91

摘要： A method of encoding a video signal using a graph-based transformation includes: generating a residual block using a prediction block generated according to an intra prediction mode; obtaining at least one of a self-loop weight indicating a weight of boundary pixels in the residual block or a correlation coefficient indicating an inter-pixel correlation, on the basis of a prediction angle corresponding to the intra prediction mode; generating a graph on the basis of at least one of the self-loop weight or the correlation coefficient; determining a graph-based transformation kernel on the basis of the graph; and performing a transform for the residual block using the graph-based transformation kernel.

公开(公告)号：US10341677B2

公开(公告)日：2019-07-02

申请号：US14400214

申请日：2013-05-09

申请人： LG Electronics Inc.

发明人： Jaewon Sung ,  Sehoon Yea ,  Moonmo Koo ,  Jin Heo ,  Taesup Kim ,  Jiwook Jung ,  Eunyong Son

IPC分类号： H04N11/02 ,  H04N19/52 ,  H04N19/597 ,  H04N19/109 ,  H04N19/119 ,  H04N19/159 ,  H04N19/176 ,  H04N19/593 ,  H04N19/51 ,  H04N19/463

摘要： A method for processing video signals by a decoding apparatus includes determining whether the temporal neighboring block of a current texture block is coded using inter-view prediction; and determining whether the spatial neighboring block of the current texture block is coded using inter-view prediction. When the temporal neighboring block and the spatial neighboring block are not coded using the inter-view prediction, deriving an inter-view motion vector of the current texture block as a disparity vector, and performing inter-view prediction for the current texture block using the derived inter-view motion vector of the current texture block. The disparity vector is obtained using a depth value according the current texture block.