Determining a Motion Vector Type Based on a Weight Index at a Sample Position in a Coding Block Partitioned in Geometric Partitioning Mode

An apparatus of video decoding, comprising:

• processing circuitry configured to:
• receive a syntax element from a bitstream of a coded video associated with a current coding block that is partitioned into a first part and a second part along a partition edge for prediction in a geometric partitioning mode;
• determine a weight index at a sample position of the current coding block, the weight index being used to derive a blending weight for blending two prediction signals corresponding to the first part and the second part of the current coding block;
• determine a stored motion vector type for a first motion storage unit in a motion field of the current coding block based on a motion index of the first motion storage unit, wherein the weight index at the sample position of the current coding block that is used to derive the blending weight is used as the motion index of the first motion storage unit;
• and
• store the motion field of the current coding block based on the stored motion vector type determined for the first motion storage unit in the motion field of the current coding block,
• wherein the first motion storage unit has a size of 4×4 samples and is at a position of (xsb, ysb) in the motion field of the current coding block, the sample position of the current coding block has a coordinate of ((xsb<<2)+i, (ysb<<2)+j) in the current coding block, and the weight index at the coordinate of ((xsb<<2)+i, (ysb<<2)+j) is used as the motion index of the first motion storage unit, where i and j are greater than or equal to 0 and less than 4.

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

• receiving a syntax element from a bitstream of a coded video associated with a current coding block that is partitioned into a first part and a second part along a partition edge for prediction in a geometric partitioning mode;
• determining a weight index at a sample position of the current coding block, the weight index being used to derive a blending weight for blending two prediction signals corresponding to the first part and the second part of the current coding block;
• determining a stored motion vector type for a first motion storage unit in a motion field of the current coding block based on a motion index of the first motion storage unit, wherein the weight index at the sample position of the current coding block that is used to derive the blending weight is used as the motion index of the first motion storage unit;
• and
• storing the motion field of the current coding block based on the stored motion vector type determined for the first motion storage unit in the motion field of the current coding block,
• wherein the first motion storage unit has a size of 4×4 samples and is at a position of (xsb, ysb) in the motion field of the current coding block, the sample position of the current coding block has a coordinate of ((xsb<<2)+i, (ysb<<2)+j) in the current coding block, and the weight index at the coordinate of ((xsb<<2)+i, (ysb<<2)+j) is used as the motion index of the first motion storage unit, where i and j are greater than or equal to 0 and less than 4.