TRANSFORM METHOD, ENCODER, DECODER, AND STORAGE MEDIUM

A transform method, an encoder, a decoder, and a storage medium are provided. 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 bl...

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Bibliographic Details
Main Authors QIAO, Wenhan, YANG, Fuzheng, LI, Xinwei, HUO, Junyan, MA, Yanzhuo, WAN, Shuai
Format Patent
LanguageEnglish
French
German
Published 25.01.2023
Subjects
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
PICTORIAL COMMUNICATION, e.g. TELEVISION
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Summary:A transform method, an encoder, a decoder, and a storage medium are provided. 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.
Bibliography:Application Number: EP20190958280