Selection and Signaling of Motion Vector (MV) Precisions

A method implemented in a video encoder, comprising:

• obtaining, by a processor of the video encoder, candidate motion vectors (MVs) corresponding to neighboring blocks of a current block, the neighboring blocks neighboring the current block;
• obtaining, by the processor, precisions of candidate MVs;
• rounding, by the processor, the precisions to a target precision based on a rounding scheme;
• rounding, by the processor, the candidate MVs based on the target precision;
• performing, by the processor, pruning of the candidate MVs;
• generating, by the processor, a candidate list based on the rounding of the candidate MVs and the pruning;
• selecting, by the processor, one of the candidate MVs from the candidate list for encoding the current block;
• and
• encoding, by the processor, an MV candidate index corresponding to the one of the candidate MVs that was selected in a bitstream.

A non-transitory computer readable medium comprising a computer program product for use by a video coding device, the computer program product comprising computer executable instructions stored on the non-transitory computer readable medium such that when executed by a processor cause the video coding device to:

• obtain candidate motion vectors (MVs) corresponding to neighboring blocks of a current block, the neighboring blocks neighboring the current block;
• obtain precisions of candidate MVs;
• round the precisions to a target precision based on a rounding scheme;
• round the candidate MVs based on the target precision;
• perform pruning of the candidate MVs;
• generate a candidate list based on the rounding of the candidate MVs and the pruning;
• select one of the candidate MVs from the candidate list for encoding the current block;
• and
• encode an MV candidate index corresponding to the one of the candidate MVs that was selected in a bitstream.