公开(公告)号：US20230291925A1

公开(公告)日：2023-09-14

申请号：US18008209

申请日：2020-07-01

Applicant: Google LLC

Inventor： Debargha Mukherjee ,  Yue Chen ,  Urvang Joshi ,  Sarah Parker ,  Elliott Karpilovsky ,  Hui Su

IPC: H04N19/52 ,  H04N19/176 ,  H04N19/593 ,  H04N19/105

CPC classification number: H04N19/52 ,  H04N19/176 ,  H04N19/593 ,  H04N19/105

Abstract: Video coding in accordance with an inter-intra prediction model may include coding an inter-prediction motion vector for a current block of a current frame, obtaining spatial block-context pixels oriented relative to the current block, generating an inter-prediction block, generating a corresponding set of reference block-context pixels oriented relative to the inter-prediction block, identifying inter-intra prediction parameters that correspond with minimizing error between the spatial block-context pixels and the reference block-context pixels, generating a prediction block for the current block by, for a current pixel of the current block, obtaining an inter-prediction pixel, determining a predictor for the current pixel using a combination of the inter-prediction pixel and the inter-intra prediction parameters, and including the predictor in the prediction block.

公开(公告)号：US20230011893A1

公开(公告)日：2023-01-12

申请号：US17779692

申请日：2019-12-23

Applicant: Google LLC

Inventor： Debargha Mukherjee ,  Lester Lu ,  Elliott Karpilovsky

IPC: H04N19/126 ,  H04N19/176 ,  H04N19/463 ,  H04N19/12 ,  H04N19/60 ,  H04N19/119 ,  H04N19/42

Abstract: Residual coding using vector quantization (VQ) is described. A flag indicating whether a residual block for the current block is encoded using VQ. In response to the flag indicating that the residual block is encoded using VQ, a parameter indicating an entry in a codebook is decoded, and the residual block is decoded using the entry. In response to the flag indicating that the residual block is not encoded using VQ, the residual block is decoded based on a skip flag indicating whether the current block is encoded using transform skip. The current block is reconstructed using the residual block.

公开(公告)号：US20220345704A1

公开(公告)日：2022-10-27

申请号：US17860585

申请日：2022-07-08

Applicant: GOOGLE LLC

Inventor： Sarah Parker ,  Debargha Mukherjee ,  Yue Chen ,  Elliott Karpilovsky ,  Urvang Joshi

IPC: H04N19/119 ,  H04N19/12 ,  G06N20/00 ,  H04N19/176 ,  H04N19/61

Abstract: Transform-level partitioning of a prediction residual block is performed to improve compression efficiency of video data. During encoding, a prediction residual block is generated responsive to prediction-level partitioning performed against a video block, a transform block partition type to use is determined based on the prediction residual block, a non-recursive transform-level partitioning is performed against the prediction residual block according to the transform block partition type, and transform blocks generated as a result of the transform-level partitioning are encoded to a bitstream. During decoding, a symbol representative of the transform block partition type used to encode transform blocks is derived from the bitstream, inverse transformed blocks are produced by inverse transforming encoded video data associated with the prediction residual block, and the prediction residual block is reproduced according to the transform block partition type and used to reconstruct the video block, which is output within an output video stream.

公开(公告)号：US11388401B2

公开(公告)日：2022-07-12

申请号：US16912767

申请日：2020-06-26

Applicant: GOOGLE LLC

Inventor： Sarah Parker ,  Debargha Mukherjee ,  Yue Chen ,  Elliott Karpilovsky ,  Urvang Joshi

IPC: H04N19/119 ,  H04N19/12 ,  G06N20/00 ,  H04N19/176 ,  H04N19/61

Abstract: Transform-level partitioning of a prediction residual block is performed to improve compression efficiency of video data. During encoding, a prediction residual block is generated responsive to prediction-level partitioning performed against a video block, a transform block partition type to use is determined based on the prediction residual block, a non-recursive transform-level partitioning is performed against the prediction residual block according to the transform block partition type, and transform blocks generated as a result of the transform-level partitioning are encoded to a bitstream. During decoding, a symbol representative of the transform block partition type used to encode transform blocks is derived from the bitstream, inverse transformed blocks are produced by inverse transforming encoded video data associated with the prediction residual block, and the prediction residual block is reproduced according to the transform block partition type and used to reconstruct the video block, which is output within an output video stream.

公开(公告)号：US20220217336A1

公开(公告)日：2022-07-07

申请号：US17700298

申请日：2022-03-21

Applicant: Google LLC

Inventor： Lester Lu ,  Debargha Mukherjee ,  Elliott Karpilovsky

IPC: H04N19/107 ,  H04N19/122 ,  H04N19/176 ,  H04N19/50

Abstract: Decoding video data includes, for a block encoded using a prediction mode, determining a transform mode for the block using the prediction mode. The transform mode is a first mode when the prediction mode is an inter-prediction mode and is a second mode when the prediction mode is an intra-prediction mode. The first mode is an available first transform type that is a combination of transforms selected from first fixed transforms and first learned transforms that each comprise a respective transformation matrix generated iteratively using blocks predicted using the inter-prediction mode. The second mode is an available second transform type that is a combination of transforms selected from second fixed transforms, which is a proper subset of the first fixed transforms, and a second learned transform comprising a transformation matrix that is generated iteratively using blocks predicted using the intra-prediction mode. Decoding the block uses the prediction and transform modes.