Patent ID: 11902569
Assignee: LG ELECTRONICS INC.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A video decoding method performed by a decoding device, the video decoding method comprising:
deriving motion vectors for control points (CPs) for a current block;
deriving a motion vector for the current block based on the obtained motion vectors for the CPs;
performing a prediction for the current block based on the motion vector for the current block; and
generating a reconstructed block for the current block based on a result of the prediction for the current block,
wherein the CPs includes a first CP, a second CP and a third CP, wherein the first CP is for a top-left corner of the current block, the second CP is for a top-right corner of the current block and the third CP is for bottom-left corner of the current block,
wherein the motion vectors for the CPs include a first motion vector for the first CP, a second motion vector for the second CP and a third motion vector for the third CP,
wherein the first motion vector is derived based on a firstly-checked available block according to a first predefined priority order in a first block group,
wherein the first block group comprises a top-left corner neighboring block of the current block, a first top neighboring block which is leftmost block among blocks adjacent to an upper side of the current block and a first left neighboring block which is an uppermost block among blocks adjacent to a left side of the current block,
wherein the second motion vector is derived based on a firstly-checked available block according to a second predefined priority order in a second block group,
wherein the second block group comprises a top-right corner neighboring block of the current block and a second top neighboring block which is a rightmost block among the blocks adjacent to the upper side of the current block,
wherein the third motion vector is derived based on a firstly-checked available block according to a third predefined priority order in a third block group, and
wherein the third block group comprises a bottom-left corner neighboring block of the current block and a second left neighboring block which is a lowermost block among the blocks adjacent to the left side of the current block.