Methods and devices for enhancing block adaptive weighted prediction

An apparatus for decoding a current block of a current frame in a coded video bitstream, the apparatus comprising:

• a memory storing instructions;
• and
• a processor in communication with the memory, wherein, when the processor executes the instructions, the processor is configured to cause the apparatus to:
• receive the coded video bitstream;
• identify, from the coded video bitstream, a motion vector corresponding to a reference block associated with the current block of the current frame;
• obtain a scaling factor based on a syntax explicitly signed in the coded video bitstream;
• determine a template used to derive an offset value;
• derive the offset value based on the template;
• generate a predicted block based on the reference block according to a linear equation, the linear equation being associated with the scaling factor and the offset value;
• and
• reconstruct the current block based on the predicted block.

A non-transitory computer readable storage medium storing instructions, wherein, when the instructions are executed by a processor, the instructions are configured to cause the processor to:

• receive a coded video bitstream;
• identify, from the coded video bitstream, a motion vector corresponding to a reference block associated with a current block of a current frame;
• obtain a scaling factor based on a syntax explicitly signed in the coded video bitstream;
• determine a template used to derive an offset value;
• derive the offset value based on the template;
• generate a predicted block based on the reference block according to a linear equation, the linear equation being associated with the scaling factor and the offset value;
• and
• reconstruct the current block based on the predicted block.