Affine coding with offsets

An apparatus for video encoding, comprising:

• processing circuitry configured to:
• determine a base predictor of a block in a current picture;
• determine a plurality of offset indexes in a plurality of respective pre-defined mapping tables, the plurality of offset indexes indicating corresponding offset values to be applied to parameters of an affine model for the base predictor;
• and
• generate a coded video bitstream, the coded video bitstream including prediction information that indicates the plurality of offset indexes,
• wherein the pre-defined mapping tables include a first mapping table of distance offset indexes that are mapped to different pixel distances and a second mapping table of offset direction indexes that are mapped to different pairs of directions on an x-axis and a y-axis.

A non-transitory computer-readable medium storing instructions which when executed by a computer for video encoding cause the computer to perform a method comprising:

• determining a base predictor of a block in a current picture;
• determining a plurality of offset indexes in a plurality of respective pre-defined mapping tables, the plurality of offset indexes indicating corresponding offset values to be applied to parameters of an affine model for the base predictor;
• and
• generating a coded video bitstream, the coded video bitstream including prediction information that indicates the plurality of offset indexes,
• wherein the pre-defined mapping tables include a first mapping table of distance offset indexes that are mapped to different pixel distances and a second mapping table of offset direction indexes that are mapped to pairs of offset directions on an x-axis and a y-axis.