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US 2017/0324963 A1Published application
Methods and apparatuses of encoding/decoding intra prediction mode using candidate intra prediction modes
AssigneeIntellectual Discovery Co., Ltd.
InventorSun Young LEE
Life of this patent
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Abstract
A method and an apparatus of encoding/decoding intra prediction mode using a plurality of candidate intra prediction modes are disclosed. The method includes deriving three candidate intra prediction modes about a current block and deriving an intra prediction mode of the current block.
Claims12
A decoding method, comprising:
- determining whether a first intra prediction mode derived from a first neighboring block located at the left side of a current block is identical to a second intra prediction mode derived from a second neighboring block located at the upper side of the current block;
- obtaining an intra prediction mode of the current block based on a plurality of candidate intra prediction modes;
- and
- obtaining prediction samples of the current block based on the intra prediction mode of the current block,
- wherein when the first intra prediction mode is not identical to the second intra prediction mode, the method comprises:
- deriving a first candidate intra prediction mode from the first intra prediction mode and a second candidate intra prediction mode from the second intra prediction mode;
- setting a third candidate intra prediction mode equal to a planar mode when none is of the first candidate intra prediction mode and the second candidate intra prediction mode is the planar mode;
- setting the third candidate intra prediction mode equal to a DC mode when one of the first candidate intra prediction mode and the second candidate intra prediction mode is the planar mode and the other is not the DC mode;
- and
- setting the third candidate intra prediction mode equal to a vertical mode when one of the first candidate intra prediction mode and the second candidate intra prediction mode is the planar mode and the other is the DC mode, and
- wherein when the first intra prediction mode is identical to the second intra prediction mode and both the first intra prediction mode and the second intra prediction mode are the planar mode or the DC mode, the method comprises:
- setting the first candidate intra prediction mode equal to the planar mode;
- setting the second candidate intra prediction mode equal to the DC mode;
- and
- setting the third candidate intra prediction mode equal to the vertical mode.
12 more elements
A decoding apparatus, comprising one or more processors configured to execute processor-executable instructions to:
- decode information indicating whether one of a plurality of candidate intra prediction modes is identical to an intra prediction mode of a current block;
- derive the intra prediction mode of the current block based on the decode information;
- and
- obtaining prediction samples of the current block based on the intra prediction mode of the current block,
- wherein when a first intra prediction mode derived from a first neighboring block located at the left side of the current block is not identical to a second intra prediction mode derived from a second neighboring block located at the upper side of the current block, the one or more processors is configured to:
- derive a first candidate intra prediction mode from the first intra prediction mode and a second candidate intra prediction mode from the second intra prediction mode;
- set a third candidate intra prediction mode equal to a planar mode when none of the first candidate intra prediction mode and the second candidate intra prediction mode is the planar mode;
- set the third candidate intra prediction mode equal to a DC mode when one of the first candidate intra prediction mode and the second candidate intra prediction mode is the planar mode and the other is not the DC mode;
- and
- set the third candidate intra prediction mode equal to a vertical mode when one of the first candidate intra prediction mode and the second candidate intra prediction mode is the planar mode and the other is the DC mode, and
- wherein when the first intra prediction mode is identical to the second intra prediction mode and both the first intra prediction mode and the second intra prediction mode are the planar mode or the DC mode, the one or more processors is configured to:
- set the first candidate intra prediction mode equal to the planar mode;
- set the second candidate intra prediction mode equal to the DC mode;
- and
- set the third candidate intra prediction mode equal to the vertical mode.
12 more elements
Dependencies are inferred from the claim text.