CPC H04N 19/105 (2014.11) [H04N 19/11 (2014.11); H04N 19/119 (2014.11); H04N 19/132 (2014.11); H04N 19/159 (2014.11); H04N 19/176 (2014.11); H04N 19/46 (2014.11); H04N 19/593 (2014.11); H04N 19/70 (2014.11)] | 3 Claims |
1. A video decoding method performed by a decoding apparatus, the method comprising:
receiving a bitstream including prediction mode information and residual information;
determining that an intra prediction is applied for a current block based on the prediction mode information;
constructing a most probable mode (MPM) list by deriving MPM candidates for the current block based on neighboring blocks adjacent to the current block, wherein the neighboring blocks comprises a left neighboring block and an upper neighboring block;
deriving an intra prediction mode for the current block based on the MPM list;
generating predicted samples by performing prediction for the current block based on the intra prediction mode;
generating residual samples for the current block based on the residual information; and
generating a reconstructed picture for the current block based on the predicted samples and the residual samples,
wherein the step of constructing the MPM list includes:
checking a condition 1 whether the left neighboring block and the upper neighboring block are the same intra prediction mode;
checking a condition 2 whether a mode number of the left neighboring block is greater than a mode number of a DC mode, based on a case where the condition 1 is satisfied;
checking a condition 3 whether the mode number of the left neighboring block and a mode number of the upper neighboring block are greater than the mode number of the DC mode, based on a case where the condition 1 is not satisfied;
checking a condition 4 whether a difference between the mode number of the left neighboring block and the mode number of the upper neighboring block is equal to 1, based on a case where the condition 3 is satisfied;
checking a condition 5 whether one of the mode number of the left neighboring block and the mode number of the upper neighboring block is greater than the mode number of the DC mode, based on a case where the condition 3 is not satisfied;
constructing the MPM list based on at least one of the condition 1 to the condition 5,
wherein the step of deriving the intra prediction mode for the current block includes:
obtaining MPM flag information related to whether the intra prediction mode for the current block is included among the MPM candidates;
obtaining remaining mode information for indicating the intra prediction mode for the current block among remaining intra prediction modes except for the MPM candidates based on the MPM flag information; and
deriving the intra prediction mode for the current block based on the remaining mode information,
wherein the remaining mode information is obtained based on a value of the MPM flag information being equal to 0, and
wherein the remaining mode information is obtained based on a truncated binary (TB) binarization process.
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