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US 11,689,716 B2Granted
Image encoding/decoding method, apparatus, and recording medium for storing bitstream
AssigneeLx Semicon Co., Ltd.
InventorsHyun Suk Ko, Sung Chang Lim, Jung Won Kang, Dong San Jun, Seung Hyun Cho, Jin Ho Lee, Ha Hyun Lee, Hui Yong Kim, Jin Soo Choi
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Abstract
The present invention relates to an image encoding/decoding method and apparatus. The image decoding method according to the present invention may comprise constructing N MPM lists for a current block, wherein N is equal to or greater than 1, deriving an intra prediction mode of the current block based on the N MPM lists, and performing intra prediction for the current block based on the intra prediction mode.
Claims13
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.
6 more elements
An image encoding method performed by an image encoding apparatus, the method comprising:
- determining an intra prediction mode of a current block;
- generating a prediction block of the current block based on the determined intra prediction mode of the current block;
- deciding whether the intra prediction mode of the current block is identical to an intra prediction mode included in a first MPM list;
- encoding information representing that the intra prediction mode of the current block is identical to 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;
- encoding 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,
- deriving a residual block of the current block by using the current block and the prediction block;
- and
- encoding the residual 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.
8 more elements
A non-transitory computer readable recording medium storing a bitstream that is generated by an image encoding method, the method comprising:
- determining an intra prediction mode of a current block;
- generating a prediction block of the current block based on the determined intra prediction mode of the current block;
- deciding whether the intra prediction mode of the current block is identical to an intra prediction mode included in a first MPM list;
- encoding information representing that the intra prediction mode of the current block is identical to 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;
- encoding 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,
- deriving a residual block of the current block by using the current block and the prediction block;
- and
- encoding the residual 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.
8 more elements
Dependencies are inferred from the claim text.