Method of background residual prediction for video coding

An apparatus for video encoding or decoding utilizing adaptive background residual prediction, the apparatus comprising one or more electronic circuits configured to:

• receive input data associated with a current coding block in a current picture;
• split the current coding block into one or more coding sub-blocks;
• locate a reference sub-block in a reference picture for a current sub-block of the current coding block according to a motion vector associated with the current coding block;
• locate a background reference sub-block in a background picture for the reference sub-block, wherein the background reference sub-block is positioned at a first set of location coordinates (x1, y1) in the background picture, and the reference sub-block is positioned at the same first set of location coordinates (x1, y1) in the reference picture;
• and
• select a first predictor or a second predictor to encode or decode the current sub-block based on a selection decision, wherein the first predictor corresponds to the reference sub-block and the second predictor is derived according to the reference sub-block and the background picture.

A method of video encoding or decoding utilizing adaptive background residual prediction, the method comprising:

• receiving input data associated with a current coding block in a current picture;
• splitting the current coding block into one or more coding sub-blocks;
• locating a reference sub-block in a reference picture for a current sub-block of the current coding block according to a motion vector associated with the current coding block;
• locating a background reference sub-block in a background picture for the reference sub-block, wherein the background reference sub-block is positioned at a first set of location coordinates (x1, y1) in the background picture, and the reference sub-block is positioned at the same first set of location coordinates (x1, y1) in the reference picture;
• locating a background current sub-block in a background picture, wherein the background current sub-block is positioned at a second set of location coordinates (x2, y2) in the background picture, and the current sub-block is positioned at the same second set of location coordinates (x2, y2) in the current picture;
• calculating a predictor for the current sub-block according to the reference sub-block, the background reference sub-block, and the background current sub-block;
• and
• encoding or decoding the current sub-block using the predictor.