Encoding method, decoding method, encoder, decoder, and storage medium

By combining MIP mode and LFNST technology in H.266/VVC, video encoding is optimized, and the problem of low encoding and decoding efficiency is solved, and a more efficient encoding and decoding process is achieved.

CN119653081AActive Publication Date: 2025-03-18GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP LTD
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Patent Information

Application Number
CN202411829188.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2020-01-08
Filing Date
2020-12-29
Publication Date
2025-03-18
Estimated Expiration
2040-12-29

AI Technical Summary

Technical Problem

The matrix-based intra prediction mode (MIP) and low-frequency inseparable secondary transformation (LFNST) technology in H.266/VVC have a negative impact on the encoding and decoding efficiency.

Method used

On the encoder side, by determining the prediction parameters of the current block, intra-prediction of the chrominance components is performed using the MIP mode, and transforming the prediction residuals in combination with LFNST to encode and generate a code stream. On the decoder side, the code stream is parsed, the transform coefficient block is reconstructed, and the reconstruction block is determined based on the intra prediction value and the reconstruction residual block.

Benefits of technology

Improves encoding and decoding efficiency, reduces complexity, and reduces the storage space required during the encoding and decoding process.

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Abstract

The embodiment of the invention discloses a coding method, a decoding method, a coder, a decoder and a storage medium, and the method comprises the steps: determining a prediction parameter of a current block, and the prediction parameter comprises a prediction mode parameter; when the prediction mode parameter indicates that an intra-frame prediction value is determined by using a matrix-based intra-frame prediction MIP mode for a chrominance component of the current block, obtaining an adjacent sampling value of the current block, and determining an MIP input sampling value of the current block according to the adjacent sampling value of the current block; determining an MIP predicted value of the chrominance component of the current block according to the MIP input sampling value, the MIP weighting matrix and the shift parameter; performing filtering processing on the MIP prediction value, and determining an intra-frame prediction value of a chrominance component of the current block; determining a prediction residual value of the chrominance component of the current block according to the intra-frame prediction value of the chrominance component of the current block; performing low-frequency inseparable secondary transformation (LFNST) on the prediction residual value, and determining an LFNST parameter; and encoding the LFNST parameter, and writing the LFNST parameter into a code stream.
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