Method and apparatus for encoding/decoding intra prediction mode
AssigneeElectronics and Telecommunications Research Institute
InventorsJin Ho Lee, Hui Yong Kim, Sung Chang Lim, Jin Soo Choi, Jin Woong Kim
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Abstract
An image decoding method, according to the present invention, includes the steps of: deriving an MPM candidate mode from neighboring blocks adjacent to a target block to be decoded; generating an MPM list using the MPM candidate mode derived from the neighboring blocks; and deriving an intra prediction mode for the target block to be decoded using the generated MPM list. According to the present invention, image compression efficiency can be improved.
Claims10
A video decoding method with a decoding apparatus, comprising:
- obtaining, with the decoding apparatus, a residual block relating to a current block of a video frame to be decoded by entropy-decoding an input bitstream;
- obtaining, with the decoding apparatus, a first Most Probably Mode (MPM) candidate mode from at least one neighboring block adjacent to the current block;
- generating, with the decoding apparatus, a MPM list based on the first MPM candidate mode;
- deriving, with the decoding apparatus, an intra prediction mode of the current block based on the generated MPM list and a MPM flag, wherein the MPM flag indicates whether the MPM list includes a same MPM candidate mode as the intra prediction mode of the current block;
- performing, with the decoding apparatus, intra prediction of the current block based on the derived intra prediction mode to generate a prediction block relating to the current block;
- and
- reconstructing, with the decoding apparatus, the current block by adding the residual block and the prediction block,
- wherein the MPM list includes a second MPM candidate mode, the second MPM candidate mode being representative of a directional prediction mode, the directional prediction mode corresponding to a value resulting from either adding one to a value of the first MPM candidate mode or subtracting one from the value of the first MPM candidate mode.
A video encoding method with an encoding apparatus, comprising:
- generating, with the encoding apparatus, a prediction block relating to a current block included in a video frame to be encoded by performing intra prediction;
- determining, with the encoding apparatus, an intra prediction mode of the current block;
- obtaining, with the encoding apparatus, a first Most Probably Mode (MPM) candidate mode from at least one neighboring block adjacent to the current block;
- generating, with the encoding apparatus, a MPM list based on the first MPM candidate mode;
- determining, with the encoding apparatus, a MPM flag using the MPM list, wherein the MPM flag indicates whether the MPM list includes a same MPM candidate mode as the intra prediction mode of the current block;
- and
- encoding, with the encoding apparatus, the intra prediction mode of the current block by encoding the MPM flag, and
- wherein the MPM list includes a second MPM candidate mode, the second MPM candidate mode being representative of a directional prediction mode, the directional prediction mode corresponding to a value resulting from either adding one to a value of the first MPM candidate mode or subtracting one from the value of the first MPM candidate mode.
Dependencies are inferred from the claim text.