Motion vector scaling for non-uniform motion vector grid

摘要

In one embodiment, a method determines a scaled motion vector for a first block. A motion vector for a second block is determined where the motion vector is on a non-uniform motion vector grid. The method then maps the motion vector for the second block to a higher accuracy uniform motion vector grid that is of a higher accuracy than the non-uniform motion vector grid and scales the motion vector for the second block on the higher accuracy motion vector grid. The scaled motion vector is mapped on the higher accuracy motion vector grid to the non-uniform motion vector grid. The scaled motion vector on the non-uniform motion vector grid is associated with the first block for a temporal prediction process.

主权项

1. A method, comprising:
determining a motion vector for a second block that is a spatially neighboring block or a temporal co-located block to a first block, wherein values associated with the motion vector is are represented on a non-uniform motion vector grid having a first number of positions, the non-uniform motion vector grid having non-uniform sub-pixel phase offsets between integer pixels; mapping, by a computing device, the values to a uniform motion vector grid, the uniform motion vector grid having a second number of positions greater than the first number of positions due to the presence of more sub-pixel positions between the integer pixels than the non-uniform motion vector grid and providing a uniform distribution of sub-pixel positions between the integer pixels; scaling, by the computing device, the values represented on the uniform motion vector grid to generate scaled motion vector values; and mapping, by the computing device, the scaled motion vector values represented on the uniform motion vector grid to the non-uniform motion vector grid, wherein the scaled motion vector values represented on the non-uniform motion vector grid are associated with the first block for a temporal prediction process.