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US 11,902,512 B2Granted
Method and apparatus for intra-prediction coding of video data involving matrix-based intra-prediction
AssigneesHyundai Motor Company, Kia Corporation, Ewha University-Industry Collaboration Foundation
InventorsJe Won Kang, Sang Hyo Park, Seung Wook Park, Wha Pyeong Lim
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Abstract
An apparatus for decoding video data includes a decoder configured to decode, from a bitstream, a syntax element indicating an intra-prediction type of a current block of the video data, and an intra-predictor configured to generate a prediction block for the current block by selectively performing matrix based intra-prediction (MIP) or regular intra-prediction based on the intra-prediction type of the current block indicated by the syntax element.
Claims8
An apparatus for decoding video data, comprising:
- a decoder configured to decode, from a bitstream, a syntax element indicating an intra-prediction type of a current block of the video data, the intra-prediction type being indicated from among matrix based intra-prediction (MIP) and regular intra-prediction;
- and
- an intra-predictor configured to generate a prediction block for the current block by selectively performing the MIP or the regular intra-prediction based on the intra-prediction type of the current block indicated by the syntax element,
- wherein, in generating the prediction block for the current block by performing the MIP, the intra-predictor is configured to:
- decode, from the bitstream, a syntax element indicating an MIP mode for the current block, the syntax element being represented as a truncated binary code specifying one of a plurality of MIP prediction modes allowed for a width and a height of the current block;
- derive an input boundary vector using neighboring samples adjacent to the current block based on the width and the height of the current block;
- generate predicted samples for the current block based on matrix-vector multiplication between the input boundary vector and a matrix predefined for the MIP mode;
- and
- derive the prediction block for the current block based on the predicted samples,
- wherein deriving the input boundary vector using the neighboring samples adjacent to the current block comprises:
- generating an initial boundary vector filled with the neighboring samples adjacent to the current block or down-sampled values from the neighboring samples according to the width and the height of the current block;
- and
- from the initial boundary vector, generating an input boundary vector to which the matrix-vector multiplication is applied, and
- wherein generating the initial boundary vector comprises:
- decoding, from the bitstream, a syntax element indicating a concatenation order of first entries of the initial boundary vector derived from the left neighboring samples adjacent to the current block and second entries of the initial boundary vector derived from the above neighboring samples adjacent to the current block;
- and
- concatenating the first entries and the second entries according to the concatenation order and thereby generating the initial boundary vector.
14 more elements
An apparatus of encoding video data, comprising:
- an encoder configured to encode a syntax element indicating an intra-prediction type of a current block of the video data, the intra-prediction type being indicated from among matrix based intra-prediction (MIP) and regular intra-prediction, and to encode a residual block that is a difference between the current block and a prediction block;
- an intra-predictor configured to generate the prediction block for the current block by selectively performing the MIP or the regular intra-prediction based on the intra-prediction type of the current block indicated by the syntax element;
- and
- wherein, in generating the prediction block for the current block by performing the MIP, the intra-predictor is configured to:
- encode a syntax element indicating an MIP mode for the current block, the syntax element being represented as a truncated binary code specifying one of a plurality of MIP prediction modes allowed for a width and a height of the current block;
- derive an input boundary vector using neighboring samples adjacent to the current block based on the width and the height of the current block;
- generate predicted samples for the current block based on matrix-vector multiplication between the input boundary vector and a matrix predefined for the MIP mode;
- and
- derive the prediction block for the current block based on the predicted samples,
- wherein deriving the input boundary vector using the neighboring samples adjacent to the current block comprises:
- generating an initial boundary vector filled with the neighboring samples adjacent to the current block or down-sampled values from the neighboring samples according to the width and the height of the current block;
- and
- wherein generating the initial boundary vector comprises:
- encoding a syntax element indicating a concatenation order of first entries of the initial boundary vector derived from the left neighboring samples adjacent to the current block and second entries of the initial boundary vector derived from the above neighboring samples adjacent to the current block;
- and
- concatenating the first entries and the second entries according to the concatenation order and thereby generating the initial boundary vector.
13 more elements
A non-transitory computer readable medium storing a bitstream containing encoded data for video data, the bitstream being decoded by processes of:
- decoding, from a bitstream, a syntax element indicating an intra-prediction type of a current block of the video data, the intra-prediction type being indicated from among matrix based intra-prediction (MIP) and regular intra-prediction;
- and
- generating a prediction block for the current block by selectively performing the MIP or the regular intra-prediction based on the intra-prediction type of the current block indicated by the syntax element,
- wherein generating the prediction block for the current block by performing the MIP comprises:
- decoding, from the bitstream, a syntax element indicating an MIP mode for the current block, the syntax element being represented as a truncated binary code specifying one of a plurality of MIP prediction modes allowed for a width and a height of the current block;
- deriving an input boundary vector using neighboring samples adjacent to the current block based on the width and the height of the current block;
- generating predicted samples for the current block based on matrix-vector multiplication between the input boundary vector and a matrix predefined for the MIP mode;
- and
- deriving the prediction block for the current block based on the predicted samples,
- wherein deriving the input boundary vector using the neighboring samples adjacent to the current block comprises:
- generating an initial boundary vector filled with the neighboring samples adjacent to the current block or down-sampled values from the neighboring samples according to the width and the height of the current block;
- and
- from the initial boundary vector, generating an input boundary vector to which the matrix-vector multiplication is applied, and
- wherein generating the initial boundary vector comprises:
- decoding, from the bitstream, a syntax element indicating a concatenation order of first entries of the initial boundary vector derived from the left neighboring samples adjacent to the current block and second entries of the initial boundary vector derived from the above neighboring samples adjacent to the current block;
- and
- concatenating the first entries and the second entries according to the concatenation order and thereby generating the initial boundary vector.
14 more elements
Dependencies are inferred from the claim text.