Matrix intra prediction-based image coding apparatus and method

Patent metadata

Field	Value
Publication number	US-2026012579-A1
Application number	US-202519326946-A
Country	US
Kind code	A1
Filing date	Sep 12, 2025
Priority date	Aug 22, 2019
Publication date	Jan 8, 2026
Grant date	—

Abstract

An image decoding method includes obtaining image information including prediction mode information from a bitstream, obtaining matrix-based intra prediction (MIP) flag information related to whether an MIP is applied to a current block based on the prediction mode information, deriving an MIP mode for the current block based on the MIP flag information, deriving an MIP matrix for the current block based on the MIP mode, generating MIP samples for the current block based on the MIP matrix, deriving reconstructed samples for the current block based on the MIP samples, wherein for the current block of which size is equal to 64×4, the MIP flag information for the current block is obtained from the bitstream, and wherein the MIP matrix is derived further based on a width and a height of the current block.

First claim

What is claimed is:

1 . An apparatus for decoding an image, the apparatus comprising:
a memory; and at least one processor connected to the memory, the at least one processor configured to: obtain image information including prediction mode information from a bitstream; obtain matrix-based intra prediction (MIP) flag information indicating whether an MIP is applied to a current block based on the prediction mode information; derive an MIP mode for the current block based on the MIP flag information; derive an MIP matrix for the current block based on the MIP mode; generate MIP samples for the current block based on the MIP matrix; and derive reconstructed samples for the current block based on the MIP samples, wherein for the current block whose size is 64×4 in which a ratio of a width and a height of the current block is larger than four, the MIP flag information indicating whether the MIP is applied to the current block is obtained from the bitstream, wherein the MIP matrix is derived further based on the width and the height of the current block, wherein the MIP matrix is derived based on three matrix sets including a first matrix set, a second matrix set, and a third matrix set, and wherein a number of matrixes of the first matrix set is different from a number of matrixes of the second matrix set, the number of matrixes of the first matrix set is different from a number of matrixes of the third matrix set, and the number of matrixes of the second matrix set is different from the number of matrixes of the third matrix set.

2 . An apparatus for encoding an image, the apparatus comprising:
a memory; and at least one processor connected to the memory, the at least one processor configured to: determine whether a matrix-based intra prediction (MIP) is applied to a current block; generate MIP flag information indicating whether the MIP is applied to the current block based on the determining; derive an MIP mode for the MIP; derive an MIP matrix for the current block based on the MIP mode; generate MIP samples for the current block based on the MIP matrix; generate residual samples for the current block based on the MIP samples; and encode image information including information on the residual samples and MIP mode information related to the MIP mode and the MIP flag information, wherein for the current block whose size is 64×4 in which a ratio of a width and a height of the current block is larger than four, the MIP flag information indicating whether the MIP is applied to the current block is generated and is included in the image information, wherein the MIP matrix is derived further based on the width and the height of the current block, wherein the MIP matrix is derived based on three matrix sets including a first matrix set, a second matrix set, and a third matrix set, and wherein a number of matrixes of the first matrix set is different from a number of matrixes of the second matrix set, the number of matrixes of the first matrix set is different from a number of matrixes of the third matrix set, and the number of matrixes of the second matrix set is different from the number of matrixes of the third matrix set.

3 . An apparatus for transmitting data for an image, the apparatus comprising:
at least one processor configured to obtain a bitstream for the image, wherein the bitstream is generated based on determining whether a matrix-based intra prediction (MIP) is applied to a current block, generating MIP flag information indicating whether the MIP is applied to the current block based on the determining, deriving an MIP mode for the MIP, deriving an MIP matrix for the current block based on the MIP mode, generating MIP samples for the current block based on the MIP matrix, generating residual samples for the current block based on the MIP samples and encoding image information including information on the residual samples and MIP mode information related to the MIP mode and the MIP flag information; and a transmitter configured to transmit the data comprising the bitstream, wherein for the current block whose size is 64×4 in which a ratio of a width and a height of the current block is larger than four, the MIP flag information indicating whether the MIP is applied to the current block is generated and is included in the image information, wherein the MIP matrix is derived further based on the width and the height of the current block, wherein the MIP matrix is derived based on three matrix sets including a first matrix set, a second matrix set, and a third matrix set, and wherein a number of matrixes of the first matrix set is different from a number of matrixes of the second matrix set, the number of matrixes of the first matrix set is different from a number of matrixes of the third matrix set, and the number of matrixes of the second matrix set is different from the number of matrixes of the third matrix set.

Assignees

• Lg Electronics Inc

Inventors

• Choi Jangwon
• Heo Jin
• Yoo Sunmi
• Choi Jungah
• Kim Seunghwan

Classifications

• H04N19/70

  characterised by syntax aspects related to video coding, e.g. related to compression standards · CPC title

• H04N19/46

  Embedding additional information in the video signal during the compression process (H04N19/517, H04N19/68, H04N19/70 take precedence) · CPC title

• H04N19/176

  the region being a block, e.g. a macroblock · CPC title

• H04N19/159

  Prediction type, e.g. intra-frame, inter-frame or bidirectional frame prediction · CPC title

• H04N19/132

  Sampling, masking or truncation of coding units, e.g. adaptive resampling, frame skipping, frame interpolation or high-frequency transform coefficient masking · CPC title