TRANSFORM-BASED IMAGE CODING METHOD AND DEVICE THEREFOR

Abstract: an image decoding method according to the present document can comprise the steps of: acquiring, from a bitstream, intra prediction mode information and an lfnst index; deriving, as a cross-component linear model (cclm) mode, an intra prediction mode of a chroma block on the basis of the intra prediction mode information; changing the intra prediction mode of the chroma block from the cclm mode to an intra prediction mode of a luma block corresponding to the chroma block; determining an lfnst set, including lfnst matrices, on the basis of the intra prediction mode of the luma block; selecting one of the lfnst matrices on the basis of the lfnst set and the lfnst index; and deriving transform coefficients for the chroma block on the basis of the selected lfnst matrix.

Inventor(s): Moonmo Koo, Seunghwan Kim, Jaehyun Lim

CPC Classification: H04N19/132 (Sampling, masking or truncation of coding units, e.g. adaptive resampling, frame skipping, frame interpolation or high-frequency transform coefficient masking)

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