CPC H04N 19/11 (2014.11) [H04N 19/159 (2014.11); H04N 19/176 (2014.11); H04N 19/46 (2014.11)] | 13 Claims |
1. An image decoding method performed by an image decoding apparatus, the method comprising:
deciding whether an intra prediction mode of a current block is identical to an intra prediction mode included in a first MPM(Most Probable Mode) list;
determining the intra prediction mode of the current block using the intra prediction mode included in the first MPM list in case the intra prediction mode of the current block is determined to be identical to the intra prediction mode included in the first MPM list;
determining the intra prediction mode of the current block using an intra prediction mode included in a second MPM list for the current block in case the intra prediction mode of the current block is determined to be not identical to the intra prediction mode included in the first MPM list;
generating a prediction block of the current block based on the determined intra prediction mode of the current block; and
generating a reconstructed block of the current block by using the prediction block of the current block,
wherein the second MPM list is configured based on an intra prediction mode of a left block adjacent to the current block and an intra prediction mode of an upper block adjacent to the current block,
wherein the second MPM list comprises the intra prediction mode of the left block and the intra prediction mode of the upper block and two or more additional MPM candidates, and
wherein the two or more additional MPM candidates are derived based on the intra prediction mode of the left block and the intra prediction mode of the upper block in response to that the intra prediction mode of the left block is different from the intra prediction mode of the upper block.
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