motion refinement method and apparatus based on bi-directional optical flow for video encoding

摘要

method and apparatus for using bi-directional (bio) optical flow for a true bi-directional predicted block are disclosed. according to a method of the present invention, a non-split bio process is disclosed, where the movement displacement x and movement displacement y are derived using operations including displacement to the right without any division operation. according to another method, a refined predictor is generated for the current block, applying the bio process to the reference blocks, in which the application of the bio process comprises the application of a bio process dependent on boundary condition conditionally to the associated boundary pixels reference blocks.