Method and apparatus for video coding

An apparatus of video decoding, comprising circuitry configured to:

• determine an affine model for a current block coded with an interweaved affine mode;
• generating, based on the affine model, a first prediction block corresponding to a first pattern for partitioning the current block into first sub-blocks and a second prediction block corresponding to a second pattern for partitioning the current block into second sub-blocks, wherein the first and second prediction blocks include interpolated samples having an intermediate bit-depth larger than an input bit-depth of the current block;
• and
• generate a third prediction block based on the first and second prediction blocks, wherein first samples in the first prediction block and corresponding second samples in the second prediction block each with a precision corresponding to the intermediate bit-depth are combined by performing a weighted average operation to obtain averaged samples, and the averaged samples are rounded to the input bit-depth to obtain corresponding third samples in the third prediction block.

A non-transitory computer-readable medium storing instructions that, when executed by a computer for video decoding, cause the computer to perform a method of video decoding, the method comprising:

• determining an affine model for a current block coded with an interweaved affine mode;
• generating, based on the affine model, a first prediction block corresponding to a first pattern for partitioning the current block into first sub-blocks and a second prediction block corresponding to a second pattern for partitioning the current block into second sub-blocks, wherein the first and second prediction blocks include interpolated samples having an intermediate bit-depth larger than an input bit-depth of the current block;
• and
• generating a third prediction block based on the first and second prediction blocks, wherein first samples in the first prediction block and corresponding second samples in the second prediction block each with a precision corresponding to the intermediate bit-depth are combined by performing a weighted average operation to obtain averaged samples, and the averaged samples are rounded to the input bit-depth to obtain corresponding third samples in the third prediction block.