Method and apparatus for video coding
First Claim
1. A method for video decoding, comprising:
- decoding prediction information of a chroma coding unit in a segment of a current picture from a coded video bitstream, the segment lacking a temporal reference picture and having separate coding tree structures for luma and chroma components;
detecting a prediction mode flag associated with the chroma coding unit from the coded video bitstream;
determining, based on the prediction mode flag, a prediction mode to be an intra block copy mode for the chroma coding unit;
detecting an omission of a specific block vector for the chroma coding unit by the coded video bitstream;
in response to (i) the detection of the omission of the specific block vector and (ii) the determination of the intra block copy mode for the chroma coding unit, determining a prediction mode of a predetermined set of luma blocks as the intra block copy mode; and
reconstructing at least one sample of the chroma coding unit according to the determined prediction mode.
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Abstract
Aspects of the disclosure provide method and apparatus for video coding. In some examples, an apparatus includes receiving circuitry and processing circuitry. The processing circuitry decodes prediction information of a chroma coding unit in a segment (such as a slice, a tile, a group of tiles) of a current picture from a coded video bitstream. The segment lacks a temporal reference picture and having separate coding tree structures for luma and chroma components. Then, the processing circuitry detects a prediction mode flag associated with the chroma coding unit from the coded video bitstream, and determines, based on the prediction mode flag, a prediction mode from an intra prediction mode and an intra block copy mode for the chroma coding unit. Further, the processing circuitry reconstructs at least one sample of the chroma coding unit according to the determined prediction mode.
19 Citations
20 Claims
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1. A method for video decoding, comprising:
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decoding prediction information of a chroma coding unit in a segment of a current picture from a coded video bitstream, the segment lacking a temporal reference picture and having separate coding tree structures for luma and chroma components; detecting a prediction mode flag associated with the chroma coding unit from the coded video bitstream; determining, based on the prediction mode flag, a prediction mode to be an intra block copy mode for the chroma coding unit; detecting an omission of a specific block vector for the chroma coding unit by the coded video bitstream; in response to (i) the detection of the omission of the specific block vector and (ii) the determination of the intra block copy mode for the chroma coding unit, determining a prediction mode of a predetermined set of luma blocks as the intra block copy mode; and reconstructing at least one sample of the chroma coding unit according to the determined prediction mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An apparatus for video decoding, comprising:
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processing circuitry configured to; decode prediction information of a chroma coding unit in a segment of a current picture from a coded video bitstream, the segment lacking a temporal reference picture and having separate coding tree structures for luma and chroma components; detect a prediction mode flag associated with the chroma coding unit from the coded video bitstream; determine, based on the prediction mode flag, a prediction mode to be an intra block copy mode for the chroma coding unit; detect an omission of a specific block vector for the chroma coding unit by the coded video bitstream; in response to (i) the detection of the omission of the specific block vector and (ii) the determination of the intra block copy mode for the chroma coding unit, determine a prediction mode of a predetermined set of luma blocks as the intra block copy mode; and reconstruct at least one sample of the chroma coding unit according to the determined prediction mode. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. A non-transitory computer-readable medium storing instructions which when executed by a computer for video decoding cause the computer to perform:
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decoding prediction information of a chroma coding unit in a segment of a current picture from a coded video bitstream, the segment lacking a temporal reference picture and having separate coding tree structures for luma and chroma components; detecting a prediction mode flag associated with the chroma coding unit from the coded video bitstream; determining, based on the prediction mode flag, a prediction mode to be an intra block copy mode for the chroma coding unit; detecting an omission of a specific block vector for the chroma coding unit by the coded video bitstream; in response to (i) the detection of the omission of the specific block vector and (ii) the determination of the intra block copy mode for the chroma coding unit, determining a prediction mode of a predetermined set of luma blocks as the intra block copy mode; and reconstructing at least one sample of the chroma coding unit according to the determined prediction mode.
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Specification