| CPC H04N 19/12 (2014.11) [H04N 19/132 (2014.11); H04N 19/159 (2014.11); H04N 19/61 (2014.11); H04N 19/70 (2014.11); H04N 19/96 (2014.11)] | 15 Claims |
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1. An image decoding apparatus, comprising:
a memory; and
at least one processor connected to the memory, the at least one processor configured to:
receive a bitstream comprising residual information,
derive transform coefficients for a target block based on the residual information,
derive modified transform coefficients based on an inverse non-separable transform of the transform coefficients,
derive residual samples for the target block based on an inverse primary transform of the modified transform coefficients, and
generate a reconstructed picture based on the residual samples for the target block,
wherein the inverse non-separable transform is performed based on a transform index indicating a predetermined transform kernel matrix,
wherein the inverse primary transform is performed based on a multiple transform selection (MTS) index indicating a horizontal transform kernel and a vertical transform kernel, and
wherein a syntax element for the transform index is context-decoded based on a context increment,
wherein based on a tree type of a partition structure of the target block being not a single tree type, a first bin among a bin string of the syntax element for the transform index is derived based on a first context increment, and
wherein based on the tree type being the single tree type, the first bin is derived based on a second context increment.
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