CALCULATION OF PREDICTION REFINEMENT BASED ON OPTICAL FLOW

摘要

A method of video processing includes determining a first motion displacement Vx (x, y) at a position (x, y) and a second motion displacement Vy (x, y) at the position (x, y) in a video block coded using an optical flow based method, wherein x and y are fractional numbers, where Vx (x, y) and Vy (x, y) are determined based at least on the position (x, y) and a center position of a basic video block of the video block, and performing a conversion between the video block and a bitstream representation of the current video block using the first motion displacement and the second motion displacement.