| CPC H04N 19/11 (2014.11) [H04N 19/176 (2014.11); H04N 19/593 (2014.11)] | 11 Claims |
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1. An image decoding method comprising:
deriving a primary intra prediction mode of a current block by decoding a bitstream,
wherein the primary intra prediction mode is derived based on a first MPM list including at least one candidate mode and a second MPM list including at least one candidate mode;
deriving an intra prediction mode of the current block by modifying the primary intra prediction mode, in case the primary intra prediction mode is a directional prediction mode;
generating a prediction block for the current block by performing intra prediction for the current block based on either the primary intra prediction mode or the derived intra prediction mode; and
reconstructing the current block based on the prediction block, and
wherein the current block is derived by dividing a coding tree block using quad-tree division.
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