Patent ID: 11968359
Assignee: LG ELECTRONICS INC.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 1:
2. A video encoding method performed by an encoding apparatus, the method comprising:
determining that an intra prediction is applied for a current block;
constructing a most probable mode (MPM) list by deriving MPM candidates for the current block based on neighboring blocks adjacent to a current block, wherein the neighboring blocks comprises a left neighboring block and an upper neighboring block;
determining an intra prediction mode for the current block;
generating prediction mode information based on the intra prediction being applied for the current block;
generating prediction samples for the current block based on the intra prediction mode for the current block;
generating residual samples for the current block based on the prediction samples;
generating residual information based on the residual samples;
encoding image information including the prediction mode information and the residual information,
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 determining the intra prediction mode for the current block includes:
generating MPM flag information based on whether the intra prediction mode for the current block is included among the MPM candidates; and
generating remaining mode information for indicating the intra prediction mode for the current block among remaining intra prediction modes except the MPM candidates, based on the MPM flag information,
wherein the remaining mode information is generated based on a value of the MPM flag information being equal to 0,
wherein the MPM flag information and the remaining mode information are encoded, and
wherein the remaining mode information is encoded based on a truncated binary (TB) binarization type.