公开(公告)号：US20210409753A1

公开(公告)日：2021-12-30

申请号：US17407548

申请日：2021-08-20

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Vasily Alexeevich RUFITSKIY ,  Timofey Mikhailovich SOLOVYEV ,  Alexey Konstantinovich FILIPPOV ,  Jianle CHEN

IPC: H04N19/513 ,  H04N19/159 ,  H04N19/30 ,  H04N19/186 ,  H04N19/176

Abstract: The present invention relates to method and apparatus for motion vector derivation for affine based inter prediction of chroma subblocks based on chroma format. The method includes: determining chroma scaling factors in horizontal and vertical directions based on chroma format information, wherein the chroma format information indicates a chroma format of a current picture which the current image block belongs to; determining a set (S) of luma subblocks of the luma block based on values of the chroma scaling factors; determining a motion vector for a chroma subblock of the chroma block based on motion vectors of one or more luma subblocks in the set (S) of luma subblocks.