Overlapped block motion compensation using spatial neighbors

An apparatus for video processing comprising a processor and a non-transitory memory with instructions thereon, wherein the instructions upon execution by the processor, cause the processor to:

• generate, based on a weighted sum of a first prediction sample and a second prediction sample, a prediction block, wherein the first prediction sample is based on a first motion information associated with a current video block, wherein the second prediction sample is based on a second motion information associated with at least one neighboring block of the current video block, wherein a weighting factor, used for the weighted sum of the first prediction sample and the second prediction sample, of the second prediction sample is based on a difference between the first prediction sample and the second prediction sample, and wherein the weighting factor for the second prediction sample is increased to ½ upon a determination that the difference between the first prediction sample and the second prediction sample is decreasing to zero;
• and
• perform, based on the prediction block, a conversion between the current video block and a bitstream of the current video block.

A non-transitory computer-readable storage medium storing instructions that cause a processor to:

• generate, based on a weighted sum of a first prediction sample and a second prediction sample, a prediction block, wherein the first prediction sample is based on a first motion information associated with a current video block, wherein the second prediction sample is based on a second motion information associated with at least one neighboring block of the current video block, wherein a weighting factor, used for the weighted sum of the first prediction sample and the second prediction sample, of the second prediction sample is based on a difference between the first prediction sample and the second prediction sample, and wherein the weighting factor for the second prediction sample is increased to ½ upon a determination that the difference between the first prediction sample and the second prediction sample is decreasing to zero;
• and
• perform, based on the prediction block, a conversion between the current video block and a bitstream of the current video block.

A non-transitory computer-readable recording medium storing a bitstream which is generated by a method performed by a video processing apparatus, wherein the method comprises:

• generating, based on a weighted sum of a first prediction sample and a second prediction sample, a prediction block, wherein the first prediction sample is based on a first motion information associated with a current video block, wherein the second prediction sample is based on a second motion information associated with at least one neighboring block of the current video block, wherein a weighting factor, used for the weighted sum of the first prediction sample and the second prediction sample, of the second prediction sample is based on a difference between the first prediction sample and the second prediction sample, and wherein the weighting factor for the second prediction sample is increased to ½ upon a determination that the difference between the first prediction sample and the second prediction sample is decreasing to zero;
• and
• generating, based on the prediction block, the bitstream from the current video block.