Affine motion prediction

An apparatus for processing video data, the apparatus comprising:

• a memory;
• and
• a processor implemented in circuitry and configured to:
• obtain video data for a current block of a current coding unit;
• determine that a size of a neighboring block of the current block in the current coding unit is greater than a minimum block size for affine motion prediction, the minimum block size including a first minimum width and a first minimum height;
• determine the size of the neighboring block is less than a minimum size threshold for using one or more affine motion vectors of the neighboring block as one or more affine motion vectors for the current block, the minimum size threshold including a second minimum width and a second minimum height, wherein at least one of the second minimum width is larger than the first minimum width and the second minimum height is larger than the first minimum height;
• exclude, from a buffer, an affine motion vector of the neighboring block when the size of the neighboring block is less than the minimum size threshold, the buffer including at least one candidate affine motion vector for affine motion prediction of the current block;
• store, in the buffer, the affine motion vector of the neighboring block as a candidate affine motion vector for affine motion prediction of the current block when the size of the neighboring block is greater than or equal to the minimum size threshold;
• and
• process the current block using affine motion prediction.

A non-transitory computer-readable medium having stored thereon instructions that, when executed by one or more processors, cause the one or more processors to:

• obtain video data for a current block of a current coding unit;
• determine that a size of a neighboring block of the current block in the current coding unit is greater than a minimum block size for affine motion prediction, the minimum block size including a first minimum width and a first minimum height;
• determine the size of the neighboring block is less than a minimum size threshold for using one or more affine motion vectors of the neighboring block as one or more affine motion vectors for the current block, the minimum size threshold including a second minimum width and a second minimum height, wherein at least one of the second minimum width is larger than the first minimum width and the second minimum height is larger than the first minimum height;
• exclude, from a buffer, an affine motion vector of the neighboring block when the size of the neighboring block is less than the minimum size threshold, the buffer including at least one candidate affine motion vector for affine motion prediction of the current block;
• store, in the buffer, the affine motion vector of the neighboring block as a candidate affine motion vector for affine motion prediction of the current block when the size of the neighboring block is greater than or equal to the minimum size threshold;
• and
• process the current block using affine motion prediction.