Guangdong Oppo Mobile Telecommunications Corp., Ltd.

Wenhan Qiao

Fuzheng Yang

Junyan Huo

Shuai Wan

Yanzhuo Ma

Xinwei Li

A transform method includes: determining a prediction mode parameter of a current block; determining a MIP parameter when the prediction mode parameter indicates that MIP is used for the current block to determine an intra prediction value; determining the intra prediction value of the current block according to the MIP parameter, and calculating a residual value between the current block and the intra prediction value; performing a first transform on the residual value to obtain a first coefficient matrix; determining a scanning order of LFNST coefficients used for the current block according to the MIP parameter when an LFNST is used for the current block; constructing an input coefficient matrix of the LFNST based on the first coefficient matrix according to the scanning order of LFNST coefficients; and performing an LFNST processing on the input coefficient matrix to obtain a transform coefficient matrix of the current block.

Transform method, encoder, decoder, and storage medium

A transform method and a decoder. The encoder determines a prediction mode parameter of a current block; determines a cross-component linear model (CCLM) parameter when the prediction mode parameter indicates that CCLM prediction is used for the current block to determine an intra prediction value; determines the intra prediction value of the current block according to the CCLM parameter, and calculates a residual value between the current block and the intra prediction value; determines a low-frequency non-separable transform (LFNST) transform kernel used for the current block according to the CCLM parameter, sets an LFNST index, and signals the LFNST index into a bitstream of a video, when LFNST is used for the current block; and transforms the residual value with the LFNST transform kernel.

Transform method and decoder

Disclosed are a transformation method, an encoder, a decoder, and a storage medium. The transformation method applied to an encoder includes: determining a prediction mode parameter of a current block; determining a Matrix-based Intra Prediction (MIP) parameter when the prediction mode parameter indicates that MIP is used for the current block to determine an intra prediction value; determining an intra prediction value of the current block according to the MIP parameter and calculating a residual value between the current block and the intra prediction value; determining a Low-Frequency Non-Separable Transform (LFNST) transform kernel used for the current block according to the MIP parameter when an LFNST is used for the current block, setting an LFNST index, and signalling the LFNST index in a video bitstream; and performing a transform processing on the residual value by using the LFNST transform kernel.

Transformation method, encoder, decoder, and storage medium

A transform method applied to an encoder includes: determining a prediction mode parameter of a current block; determining a CCLM parameter when the prediction mode parameter indicates that CCLM is used for the current block to determine an intra prediction value; determining the intra prediction value of the current block according to the CCLM parameter and calculating a residual value between the current block and the intra prediction value; performing a first transform on the residual value to obtain a first coefficient matrix; determining an LFNST coefficient scanning order used for the current block according to the CCLM parameter when an LFNST is used for the current block; constructing an input coefficient matrix of the LFNST by using the first coefficient matrix according to the LFNST coefficient scanning order; and performing an LFNST processing on the input coefficient matrix to obtain a transform coefficient matrix of the current block.

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Dongguan, China

Wenhan Qiao