Patent ID: 11877004
Assignee: TENCENT AMERICA LLC
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A method for video encoding in an encoder, comprising:
obtaining a current block having a size of W×H pixels and including a plurality of sub-blocks according to a sub-block based inter prediction mode, the plurality of sub-blocks being arranged into one or more areas having a size of M×N pixels in the current block, M≤W, and N≤H;
for each area of the one or more areas having the size of M×N pixels in the current block:
determining base motion vectors of a portion of the sub-blocks within a corresponding area, the portion including at least one non-corner sub-block of the current block;
converting the base motion vectors of the portion of the sub-blocks into respective target motion vectors of the portion of the sub-blocks, the respective target motion vectors being confined by a first lower bound and a first upper bound along a first coordinate direction and by a second lower bound and a second upper bound along a second coordinate direction, and the converting comprising, for a base motion vector of the at least one non-corner sub-block in the portion of the sub-blocks within the corresponding area, clipping values exceeding one of the first lower bound, the first upper bound, the second lower bound, or the second upper bound; and
encoding samples of the corresponding area according to the target motion vectors of the portion of the sub-blocks; and

generating a coded video bitstream including (i) the encoded samples of each of the one or more areas and (ii) prediction information of the current block, the prediction information indicating the sub block based inter prediction mode and indicating the base motion vectors of the portion of the subblocks.