Patent ID: 11917131
Assignee: LG ELECTRONICS INC.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 7:
8. An image encoding method performed by an encoding apparatus, the method comprising:
determining an inter prediction mode of a current block and generating inter prediction mode information indicating the inter prediction mode;
generating a sub-block merge candidate list for the current block based on the inter prediction mode;
generating selection information indicating one candidate among candidates included in the sub-block merge candidate list;
generating residual information based on residual samples of the current block; and
encoding image information comprising the inter prediction mode information, the selection information, and the residual information,
wherein the sub-block merge candidate list comprises a constructed affine merge candidate,
wherein the constructed affine merge candidate comprises at least one of a control point motion vector CPMV0 for a control point CP0, a control point motion vector CPMV1 for a control point CP1, a control point motion vector CPMV2 for a control point CP2 or a control point motion vector CPMV3 for a control point CP3,
wherein the CP0 is related to a top-left corner of the current block, the CP1 is related to a top-right corner of the current block, the CP2 is related to a bottom-left corner of the current block and the CP3 is related to a bottom-right corner of the current block,
wherein based on a case that the constructed affine merge candidate is generated based on {CP0, CP1}, the constructed affine merge candidate comprises CPMV0 and a weight index for the constructed affine merge candidate is equal to the weight index for the CP0,
wherein based on a case that the constructed affine merge candidate is generated based on {CP1, CP2, CP3}, the constructed affine merge candidate comprises CPMV1 and the weight index for the constructed affine merge candidate is equal to the weight index for the CP1, and
wherein the weight index for the constructed affine merge candidate is for a weighted averaging based on L0 prediction samples and L1 prediction samples.