Patent ID: 11909953
Assignee: BYTEDANCE INC.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 16:
17. An apparatus in a video system comprising a processor and a non-transitory memory with instructions thereon, wherein the instructions upon execution by the processor, cause the processor to:
derive, during a conversion between a current block of a video and a bitstream of the current block, at least one combined affine model using multiple original affine models with control point motion vectors, wherein each of the at least one combined affine model comprises a first set of control point motion vectors, wherein the multiple original affine models have multiple second sets of control point motion vectors, respectively, and wherein each control point motion vector in the first set of control point motion vectors is a function of corresponding control point motion vectors in each of the multiple second sets of control point motion vectors;
store affine model parameters for the current block; and
perform the conversion based on the affine model parameters,
wherein the affine model parameters are signaled from an encoder to a decoder,
wherein the affine model parameters are derived at least from motion vectors of control points of the current block, and
wherein the conversion is performed without storing the control point motion vectors of the current block.