Systems and methods for inter prediction compensation

A method for signaling a bitstream, the method comprising:

• receiving video data;
• encoding the video data to generate a bitstream by:
• encoding an enabling flag associated with the video data, the enabling flag indicating whether an inter predictor correction is enabled for a coding block for an inter prediction process;
• and
• encoding an index associated with the inter predictor correction based on which the inter predictor correction is performed;
• wherein the enabled inter predictor correction is performed by:
• obtaining a plurality of predicted samples within a predicted block from a top boundary and a left boundary of the predicted block corresponding to the coding block;
• obtaining a plurality of reconstructed samples from top neighboring reconstructed samples and left neighboring reconstructed samples of the coding block;
• deriving one or more parameters for the inter predictor correction based on the plurality of the predicted samples and the plurality of the reconstructed samples;
• and
• deriving a corrected predicted block based on the one or more parameters and the predicted block,
• wherein obtaining the plurality of the predicted samples and the plurality of the reconstructed samples comprises:
• determining a first parameter based on a coding mode of the coding block;
• determining a second parameter according to a width of the coding block and the first parameter;
• determining a third parameter according to a height of the coding block and the first parameter;
• and
• obtaining the plurality of the predicted samples and the plurality of the reconstructed samples based on the second parameter and the third parameter;
• and
• signaling the bitstream generated based on the encoding.

An apparatus, comprising:

• a memory configured to store instructions;
• and
• one or more processors configured to execute the instructions to cause the apparatus to:
• determine whether an inter predictor correction is enabled for a coding block;
• and
• when the inter predictor correction is enabled for the coding block, perform the inter predictor correction by:
• obtaining a plurality of predicted samples within a predicted block from a top boundary and a left boundary of the predicted block corresponding to the coding block, wherein the predicted samples are within the predicted block;
• obtaining a plurality of reconstructed samples from top neighboring reconstructed samples and left neighboring reconstructed samples of the coding block;
• and
• deriving one or more parameters for the inter predictor correction based on the plurality of the predicted samples and the plurality of the reconstructed samples;
• and
• deriving a corrected predicted block based on the one or more parameters and the predicted block,
• wherein obtaining the plurality of the predicted samples and the plurality of the reconstructed samples comprises:
• determining a first parameter based on a coding mode of the coding block;
• determining a second parameter according to a width of the coding block and the first parameter;
• determining a third parameter according to a height of the coding block and the first parameter;
• and
• obtaining the plurality of the predicted samples and the plurality of the reconstructed samples based on the second parameter and the third parameter.