Motion vector prediction

A method of encoding video data, the method comprising:

• deriving, by a video encoder, a plurality of non-adjacent spatial motion vector predictors (NA-SMVPs) from motion information of spatially non-adjacent blocks located within a same current picture as a current block of the current picture,
• wherein, for each respective NA-SMVP of the plurality of NA-SMVPs, the respective NA-SMVP corresponds to a respective non-adjacent block in a fixed pattern of non-adjacent blocks of the current picture, the respective NA-SMVP specifying a motion vector of the respective non-adjacent block;
• determining, by the video encoder, a motion vector predictor (MVP) for the current block based on a NA-SMVP in the plurality of NA-SMVPs;
• determining, by the video encoder, a motion vector of the current block, wherein the motion vector is equal to a motion vector of the MVP for the current block or is equal to the motion vector of the MVP for the current block plus a motion vector difference (MVD) signaled in a bitstream;
• determining, by the video encoder, a predictive block based on the motion vector of the current block;
• and
• generating, by the video encoder, based on the predictive block, residual sample values.

An apparatus for decoding video data, the apparatus comprising:

• one or more storage media configured to store video data;
• and
• one or more processors configured to:
• derive a plurality of non-adjacent spatial motion vector predictors (NA-SMVPs) from motion information of spatially non-adjacent blocks located within a same current picture as a current block of the current picture,
• wherein, for each respective NA-SMVP of the plurality of NA-SMVPs, the respective NA-SMVP corresponds to a respective non-adjacent block in a fixed pattern of non-adjacent blocks of the current picture, the respective NA-SMVP specifying a motion vector of the respective non-adjacent block;
• determine a motion vector predictor (MVP) for the current block based on a NA-SMVP in the plurality of NA-SMVPs;
• determine, based on the MVP for the current block, a motion vector of the current block;
• determine a predictive block based on the motion vector of the current block;
• and
• reconstruct, based on the predictive block, sample values of the current picture.

An apparatus for encoding video data, the apparatus comprising:

• one or more storage media configured to store video data;
• and
• one or more processors configured to:
• derive a plurality of non-adjacent spatial motion vector predictors (NA-SMVPs) from motion information of spatially non-adjacent blocks located within a same current picture as a current block of the current picture,
• wherein, for each respective NA-SMVP of the plurality of NA-SMVPs, the respective NA-SMVP corresponds to a respective non-adjacent block in a fixed pattern of non-adjacent blocks of the current picture, the respective NA-SMVP specifying a motion vector of the respective non-adjacent block;
• determine a motion vector predictor (MVP) for the current block based on a NA-SMVP in the plurality of NA-SMVPs;
• determine a motion vector of the current block, wherein the motion vector is equal to a motion vector of the MVP for the current block or is equal to the motion vector of the MVP for the current block plus a motion vector difference (MVD) signaled in a bitstream;
• determine a predictive block based on the motion vector of the current block;
• and
• generate, based on the predictive block, residual sample values.

An apparatus for decoding video data, the apparatus comprising:

• means for deriving a plurality of non-adjacent spatial motion vector predictors (NA-SMVPs) from motion information of spatially non-adjacent blocks located within a same current picture as a current block of the current picture,
• wherein, for each respective NA-SMVP of the plurality of NA-SMVPs, the respective NA-SMVP corresponds to a respective non-adjacent block in a fixed pattern of non-adjacent blocks of the current picture, the respective NA-SMVP specifying a motion vector of the respective non-adjacent block;
• means for determining a motion vector predictor (MVP) for the current block based on a NA-SMVP in the plurality of NA-SMVPs;
• means for determining, based on the MVP for the current block, a motion vector of the current block;
• means for determining a predictive block based on the motion vector of the current block;
• and
• means for reconstructing, based on the predictive block, sample values of the current picture.

An apparatus for encoding video data, the apparatus comprising:

• means for deriving a plurality of non-adjacent spatial motion vector predictors (NA-SMVPs) from motion information of spatially non-adjacent blocks located within a same current picture as a current block of the current picture,
• wherein, for each respective NA-SMVP of the plurality of NA-SMVPs, the respective NA-SMVP corresponds to a respective non-adjacent block in a fixed pattern of non-adjacent blocks of the current picture, the respective NA-SMVP specifying a motion vector of the respective non-adjacent block;
• means for determining a motion vector predictor (MVP) for the current block based on a NA-SMVP in the plurality of NA-SMVPs;
• means for determining a motion vector of the current block, wherein the motion vector is equal to a motion vector of the MVP for the current block or is equal to the motion vector of the MVP for the current block plus a motion vector difference (MVD) signaled in a bitstream;
• means for determining a predictive block based on the motion vector of the current block;
• and
• means for generating, based on the predictive block, residual sample values.

A computer-readable storage medium storing instructions that, when executed, cause one or more processors to:

• derive a plurality of non-adjacent spatial motion vector predictors (NA-SMVPs) from motion information of spatially non-adjacent blocks located within a same current picture as a current block of the current picture,
• wherein, for each respective NA-SMVP of the plurality of NA-SMVPs, the respective NA-SMVP corresponds to a respective non-adjacent block in a fixed pattern of non-adjacent blocks of the current picture, the respective NA-SMVP specifying a motion vector of the respective non-adjacent block;
• determine a motion vector predictor (MVP) for the current block based on a NA-SMVP in the plurality of NA-SMVPs;
• determine, based on the MVP for the current block, a motion vector of the current block;
• determine a predictive block based on the motion vector of the current block;
• and
• reconstruct, based on the predictive block, sample values of the current picture.

A computer-readable storage medium storing instructions that, when executed, cause one or more processors to:

• derive a plurality of non-adjacent spatial motion vector predictors (NA-SMVPs) from motion information of spatially non-adjacent blocks located within a same current picture as a current block of the current picture,
• wherein, for each respective NA-SMVP of the plurality of NA-SMVPs, the respective NA-SMVP corresponds to a respective non-adjacent block in a fixed pattern of non-adjacent blocks of the current picture, the respective NA-SMVP specifying a motion vector of the respective non-adjacent block;
• determine a motion vector predictor (MVP) for the current block based on a NA-SMVP in the plurality of NA-SMVPs;
• determine a motion vector of the current block, wherein the motion vector is equal to a motion vector of the MVP for the current block or is equal to the motion vector of the MVP for the current block plus a motion vector difference (MVD) signaled in a bitstream;
• determine a predictive block based on the motion vector of the current block;
• and
• generate, based on the predictive block, residual sample values.