公开(公告)号：US20220337875A1

公开(公告)日：2022-10-20

申请号：US17569681

申请日：2022-01-06

Applicant: Tencent America LLC

Inventor： Liang ZHAO ,  Xin ZHAO ,  Shan LIU

IPC: H04N19/61 ,  H04N19/176 ,  H04N19/105 ,  H04N19/119 ,  H04N19/132 ,  H04N19/11 ,  H04N19/593 ,  H04N19/423

Abstract: Methods, apparatus, and computer readable storage medium for multiple reference line intra prediction in video decoding. The method includes receiving, by a device, a coded video bitstream for a current block. The device includes a memory storing instructions and a processor in communication with the memory. The method also includes extracting, by the device, a parameter from the coded video bitstream, the parameter indicating a reference line for intra predication in the current block; partitioning, by the device, the current block to obtain a plurality of sub-blocks; and in response to a sub-block in the plurality of sub-blocks being located at a boundary of the current block, using, by the device, a top adjacent reference line as values for all top non-adjacent reference lines for the sub-block.

公开(公告)号：US20220337854A1

公开(公告)日：2022-10-20

申请号：US17568275

申请日：2022-01-04

Applicant: Tencent America LLC

Inventor： Madhu PERINGASSERY KRISHNAN ,  Xin ZHAO ,  Shan LIU

IPC: H04N19/44 ,  H04N19/119 ,  H04N19/625 ,  H04N19/176

Abstract: Methods, apparatus, and computer readable storage medium for encoding/decoding video data in a decoder. The method includes receiving a coded video bitstream for a data block; extracting, from the coded video bitstream, a transform partition type associated with the data block; and in response to the transform partition type belonging to a subset of a predefined set of transform partition types each specifying a split pattern for dividing the data block into transform blocks: extracting, as signaled in coded video bitstream, a transform type of a transform associated with a transform block split from the data block, wherein the transform type belongs to a first predefined set of transform types; and performing inverse transform on the transform block according to the transform type.

公开(公告)号：US20220239940A1

公开(公告)日：2022-07-28

申请号：US17716655

申请日：2022-04-08

Applicant: Tencent America LLC

Inventor： Liang ZHAO ,  Xin ZHAO ,  Xiang LI ,  Shan LIU

IPC: H04N19/51 ,  H04N19/176

Abstract: Aspects of the disclosure provide methods and apparatuses for video encoding/decoding. In some examples, an apparatus for video decoding includes processing circuitry. For example, the processing circuitry decodes prediction information of a current block from a coded video bitstream. The prediction information indicates that a prediction of the current block is at least partially based on an inter prediction. Then, the processing circuitry reconstructs at least a sample of the current block as a combination of a result from the inter prediction and neighboring samples of the block that are selected based on a position of the sample.

公开(公告)号：US20220201304A1

公开(公告)日：2022-06-23

申请号：US17691512

申请日：2022-03-10

Applicant: TENCENT AMERICA LLC

Inventor： Madhu Peringassery KRISHNAN ,  Xin ZHAO ,  Shan LIU

IPC: H04N19/129 ,  H04N19/60 ,  H04N19/184 ,  H04L65/60 ,  G06F17/16 ,  H04N19/176

Abstract: A method includes determining whether at least one of a height or width of a residual coding block, that corresponds to a data block of an image, is greater than or equal to a threshold; and based on determining that the at least one of the height or width of the residual coding block is greater than or equal to the threshold: obtaining a reduced-complexity residual coding block based on the residual coding block and performing transform coding of the reduced-complexity residual coding block using a line graph transform (LGT) core to perform direct matrix multiplications for each of the horizontal and vertical dimensions of the reduced-complexity residual coding block, wherein the performing includes determining an order of performing horizontal and vertical transforms to the reduced-complexity residual coding block when zero-out is enabled on LGT, depending on a ratio of width to height of the residual coding block.

公开(公告)号：US20220150518A1

公开(公告)日：2022-05-12

申请号：US17361239

申请日：2021-06-28

Applicant: TENCENT AMERICA LLC

Inventor： Madhu Peringassery KRISHNAN ,  Samruddhi KAHU ,  Xin ZHAO ,  Shan LIU

IPC: H04N19/44 ,  H04N19/61 ,  H04N19/119 ,  H04N19/159 ,  H04N19/46 ,  H04N19/176

Abstract: Aspects of the disclosure provide a method and an apparatus including processing circuitry for video decoding. The processing circuitry can decode coding information for a block from a coded video bitstream. The coding information can indicate an intra prediction mode for the block and one or a combination of transform partitioning information for the block, a size of the block, and a shape of the block. The processing circuitry can determine whether a secondary transform is disabled for the block based on the one or the combination of the transform partitioning information for the block, the size of the block, and the shape of the block. The processing circuitry can reconstruct the block based on the determination of whether the secondary transform is disabled for the block.

公开(公告)号：US20220150510A1

公开(公告)日：2022-05-12

申请号：US17360431

申请日：2021-06-28

Applicant: Tencent America LLC

Inventor： Madhu Peringassery KRISHNAN ,  Xin ZHAO ,  Shan LIU

IPC: H04N19/159 ,  H04N19/176 ,  H04N19/61 ,  H04N19/91 ,  H04N19/80 ,  H04N19/625 ,  H04N19/593

Abstract: Aspects of the disclosure provide a method and an apparatus including processing circuitry for video decoding. The processing circuitry decodes coded information for a transform block (TB) from a coded video bitstream. The coded information indicates one of intra prediction mode information that indicates an intra prediction mode used for the TB, a size of the TB, and a primary transform type used for the TB. The processing circuitry determines a context for entropy decoding a secondary transform index based on the one of the intra prediction mode information for the TB, the size of the TB, and the primary transform type used for the TB. The secondary transform index indicates a secondary transform in a set of secondary transforms that is to be performed on the TB. The processing circuitry entropy decodes the secondary transform index based on the context and performs the secondary transform.

公开(公告)号：US20220141492A1

公开(公告)日：2022-05-05

申请号：US17575076

申请日：2022-01-13

Applicant: TENCENT AMERICA LLC

Inventor： Xin ZHAO ,  Xiang LI ,  Shan LIU

IPC: H04N19/625 ,  H04N19/12 ,  G06F17/16 ,  G06F7/78

Abstract: A method of decoding or encoding including receiving information regarding a video sequence for encoding or decoding, determining, for the encoding or decoding of the video sequence, whether to use a first transform core matrix that is of a first size type or a second transform core matrix that is of a second size type, and based on the determining, transmitting information that causes the video sequence to be encoded or decoded using the determined first transform core matrix or second transform core matrix.

公开(公告)号：US20220132166A1

公开(公告)日：2022-04-28

申请号：US17572104

申请日：2022-01-10

Applicant: TENCENT AMERICA LLC

Inventor： Madhu Peringassery KRISHNA ,  Xin ZHAO ,  Shan LIU

IPC: H04N19/625 ,  H04N19/124 ,  H04N19/176 ,  H04N19/159 ,  H04N19/184 ,  H04N19/61 ,  H04N19/70

Abstract: A method of decoding may be performed by at least one processor, and may comprise: receiving an entropy coded bitstream comprising compressed video data; generating one or more dequantized blocks, determining whether at least one of a height and a width of the one or more dequantized blocks is greater than or equal to a predefined threshold, and responsive to the at least one of the height or the width of the one or more dequantized blocks being greater than or equal to the predefined threshold, transform coding a dequantized block using a tuned line graph transform (LGT) core to perform direct matrix multiplications for each of the horizontal and vertical dimensions of the one or more dequantized blocks.

公开(公告)号：US20220094983A1

公开(公告)日：2022-03-24

申请号：US17322258

申请日：2021-05-17

Applicant: Tencent America LLC

Inventor： Madhu Peringassery KRISHNAN ,  Xin ZHAO ,  Shan LIU

IPC: H04N19/60 ,  H04N19/124 ,  H04N19/132 ,  H04N19/46 ,  H04N19/176

Abstract: Aspects of the disclosure provide a method and an apparatus including processing circuitry for video decoding. The processing circuitry can decode coding information of a transform block (TB) from a coded video bitstream. The coding information can indicate a transform skip in one direction for the TB. The processing circuitry can de-quantize transform coefficients in the TB based on a plurality of quantization steps. First transform coefficients in the TB can be de-quantized based on a smallest of the plurality of quantization steps. The first transform coefficients in the TB can include one of a first row and a first column of the transform coefficients in the TB that has a DC spatial frequency. The one of the first row and the first column can be along the one direction of the transform skip. The processing circuitry can perform an inverse transform on the de-quantized transform coefficients in the TB.

公开(公告)号：US20220070484A1

公开(公告)日：2022-03-03

申请号：US17500595

申请日：2021-10-13

Applicant: TENCENT AMERICA LLC

Inventor： Xin ZHAO ,  Xiang LI ,  Shan LIU

IPC: H04N19/46 ,  H04N19/146 ,  H04N19/176 ,  H04N19/119

Abstract: Aspects of the disclosure provide methods and apparatuses for video encoding/decoding. In some examples, an apparatus for video decoding includes processing circuitry that determines, from a coded video bitstream, a portion of a block is subject to a zero-out operation based on a threshold number of samples being less than a number of samples in one of a height dimension or a width dimension of the block. The processing circuitry determines whether a mixture of a lossless coding mode and one or more lossy coding modes is allowed in the coded video bitstream. The processing circuitry reconstructs the block based on the one or more lossy coding modes in response to (i) the mixture of the lossless coding mode and the one or more lossy coding modes being allowed in the coded video bitstream and (ii) the portion of the block being subject to the zero-out operation.