| CPC H04N 19/70 (2014.11) [H04N 19/124 (2014.11); H04N 19/132 (2014.11); H04N 19/136 (2014.11); H04N 19/172 (2014.11); H04N 19/176 (2014.11); H04N 19/18 (2014.11); H04N 19/61 (2014.11); H04N 19/186 (2014.11)] | 11 Claims |
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1. An image decoding method performed by a decoding apparatus, the method comprising:
receiving residual information from a bitstream;
deriving transform coefficients for a current block based on the residual information;
determining whether to parse a multiple transform selection (MTS) index for applying an MTS to the current block;
deriving residual samples for the current block by applying the MTS to the current block based on the MTS index; and
generating a reconstructed picture based on the residual samples,
wherein determining whether to parse the MTS index comprises determining a tree type of the current block, a partition type of the current block, whether a low frequency non-separable transform (LFNST) is performed on the current block, and whether zero-out related to the MTS is performed on the current block,
wherein whether the LFNST is performed on the current block is determined based on an LFNST index related to an LFNST kernel applied to the current block,
wherein the LFNST index and the MTS index are signaled in a coding unit level syntax, and
wherein the MTS index is signaled after the signaling of the LFNST index in the coding unit level syntax.
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