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US 11,695,925 B2Granted
Intra prediction-based image coding method and apparatus using MPM list
AssigneeLG Electronics Inc.
InventorsLing Li, Jin Heo, Seunghwan Kim, Sunmi Yoo, Jangwon Choi, Jungah Choi
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Abstract
A video decoding method according to this document includes constructing a most probable mode (MPM) list by deriving MPM candidates for a current block based on a neighboring block adjacent to the current 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, and generating a reconstructed picture for the current block based on the predicted samples.
Claims13
A video decoding method performed by a decoding apparatus, the method comprising:
- constructing candidate mode list by deriving candidate modes for a 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 candidate mode list;
- generating predicted samples by performing prediction for the current block based on the intra prediction mode;
- and
- generating a reconstructed picture for the current block based on the predicted samples,
- wherein the step of constructing the candidate mode list includes:
- checking a condition 1 whether an intra prediction mode of the left neighboring block and an intra prediction mode of the upper neighboring block are the same intra prediction mode;
- checking a condition 2 whether a mode number of the intra prediction mode 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 intra prediction mode of the left neighboring block and a mode number of the intra prediction mode 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 intra prediction mode of the left neighboring block and the mode number of the intra prediction mode 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 intra prediction mode of the left neighboring block and the mode number of the intra prediction mode 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 candidate mode 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 Most Probable Mode (MPM) flag information related to whether the intra prediction mode for the current block is included among the candidate modes;
- obtaining remaining mode information for indicating the intra prediction mode for the current block among remaining intra prediction modes except for the candidate modes, based on the MPM flag information representing that the intra prediction mode for the current block is not included among the candidate modes;
- 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 truncated binary (TB) binarization process.
15 more elements
A video encoding method performed by an encoding apparatus, the method comprising:
- constructing candidate mode list by deriving candidate modes for a 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 samples by performing a prediction for the current block based on the intra prediction mode;
- and
- encoding image information including intra prediction mode information for the current block,
- wherein the step of constructing the candidate mode list includes:
- checking a condition 1 whether an intra prediction mode of the left neighboring block and an intra prediction mode of the upper neighboring block are the same intra prediction mode;
- checking a condition 2 whether a mode number of the intra prediction mode 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 intra prediction mode of the left neighboring block and a mode number of the intra prediction mode 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 intra prediction mode of the left neighboring block and the mode number of the intra prediction mode 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 intra prediction mode of the left neighboring block and the mode number of the intra prediction mode 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 candidate mode 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 Most Probable Mode (MPM) flag information based on whether the intra prediction mode for the current block is included among the candidate modes;
- and
- generating remaining mode information for indicating the intra prediction mode for the current block among remaining intra prediction modes except the candidate modes, based on the MPM flag information representing that the intra prediction mode for the current block is not included among the candidate modes,
- wherein the MPM flag information and the remaining mode information are included and encoded in the intra prediction mode information, and
- wherein the remaining mode information is encoded based on a truncated binary (TB) binarization process.
15 more elements
A non-transitory computer-readable storage medium storing a bitstream generated by a method, the method comprising:
- constructing candidate mode list by deriving candidate modes for a 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 samples by performing a prediction for the current block based on the intra prediction mode;
- and
- encoding image information including intra prediction mode information for the current block,
- wherein the step of constructing the candidate mode list includes:
- checking a condition 1 whether an intra prediction mode of the left neighboring block and an intra prediction mode of the upper neighboring block are the same intra prediction mode;
- checking a condition 2 whether a mode number of the intra prediction mode 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 intra prediction mode of the left neighboring block and a mode number of the intra prediction mode 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 intra prediction mode of the left neighboring block and the mode number of the intra prediction mode 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 intra prediction mode of the left neighboring block and the mode number of the intra prediction mode 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 candidate mode 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 Most Probable Mode (MPM) flag information based on whether the intra prediction mode for the current block is included among the candidate modes;
- and
- generating remaining mode information for indicating the intra prediction mode for the current block among remaining intra prediction modes except the candidate modes, based on the MPM flag information representing that the intra prediction mode for the current block is not included among the candidate modes,
- wherein the MPM flag information and the remaining mode information are included and encoded in the intra prediction mode information, and
- wherein the remaining mode information is encoded based on a truncated binary (TB) binarization process.
15 more elements
Dependencies are inferred from the claim text.