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US 12,771,870 B2Granted
Image encoding/decoding methods and apparatuses
AssigneeDolby International AB
InventorsBae Keun Lee, Dong San Jun
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Abstract
Image encoding/decoding methods and apparatuses according to the present invention may generate a prediction block of a current block based on a pre-defined prediction mode, generate a transform block of the current block through predetermined transformation, and reconstruct the current block based on the prediction block and the transform block.
Claims11
A method of decoding an image, the method comprising:
- determining a current block by partitioning a coding block in the image based on a tree-based block division;
- determining an intra prediction mode of the current block based on a syntax element obtained from a bitstream;
- generating a prediction block of the current block by performing intra prediction of the current block based on the intra prediction mode;
- and
- reconstructing the current block based on the prediction block,
- wherein the syntax element comprises a flag indicating whether a pre-defined default mode is used for the intra prediction of the current block,
- wherein, in response to the flag indicating that the default mode is used for the intra prediction of the current block, the intra prediction mode is set to the default mode,
- wherein, in response to the flag indicating that the default mode is not used for the intra prediction of the current block, the intra prediction mode is derived from a candidate group including a plurality of most probable mode (MPM) candidates, and
- wherein the default mode is representative of a Planar mode.
6 more elements
A method of encoding an image, the method comprising:
- determining a current block by partitioning a coding block in the image based on a tree-based block division;
- determining an intra prediction mode of the current block;
- generating a prediction block of the current block by performing intra prediction of the current block;
- and
- obtaining a residual block of the current block based on the prediction block,
- wherein a prediction block of the current block is generated by performing the intra prediction based on the determined intra prediction mode,
- wherein a flag indicating whether a pre-defined default mode is used for the intra prediction of the current block is encoded into a bitstream,
- wherein, in response to a case where the default mode is used for the intra prediction of the current block, the intra prediction mode is determined to be the default mode,
- wherein, in response to a case where the default mode is not used for the intra prediction of the current block, the intra prediction mode is determined from a candidate group including a plurality of most probable mode (MPM) candidates, and
- wherein the default mode is representative of a Planar mode.
7 more elements
A non-transitory computer-readable storage medium for storing a bitstream generated by an image encoding method,
- the image encoding method comprising:
- determining a current block by partitioning a coding block based on a tree-based block division;
- determining an intra prediction mode of the current block;
- generating a prediction block of the current block by performing intra prediction of the current block;
- and
- obtaining a residual block of the current block based on the prediction block,
- wherein a prediction block of the current block is generated by performing the intra prediction based on the determined intra prediction mode,
- wherein a flag indicating whether a pre-defined default mode is used for the intra prediction of the current block is encoded into a bitstream,
- wherein, in response to a case where the default mode is used for the intra prediction of the current block, the intra prediction mode is determined to be the default mode,
- wherein, in response to a case where the default mode is not used for the intra prediction of the current block, the intra prediction mode is determined from a candidate group including a plurality of MPM candidates, and
- wherein the default mode is representative of a Planar mode.
8 more elements
Dependencies are inferred from the claim text.