Patent ID: 11889110
Assignee: BEIJING DAJIA INTERNET INFORMATION TECHNOLOGY CO., LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 9:
10. The method of claim 9, wherein controlling the internal bit-depths of the PROF derivation process for various representation precisions of internal PROF parameters by applying right-shifting to the internal PROF parameters comprises:
obtaining, at the decoder, a horizontal gradient value of a first prediction sample I(i, j) based on a difference between a first prediction sample I(i+1,j) and a first prediction sample I(i−1,j);
obtaining, at the decoder, a vertical gradient value of the first prediction sample I(i, j) based on a difference between a first prediction sample I(i, j+1) and a first prediction sample I(i, j−1);
obtaining, at the decoder, control point motion vectors (MVs) of the first prediction sample I(i, j), wherein the control point MVs comprise the MVs of top-left, top-right, and bottom-left corner blocks of one block that contains the video block;
obtaining, at the decoder, affine model parameters derived based on the control point MVs;
obtaining, at the decoder, a horizontal MV difference Δvx(i, j) and a vertical MV difference Δvy(i, j) for the first prediction sample I(i, j) based on the affine model parameters;
right shifting, at the decoder, the horizontal MV difference Δvx(i, j) by 14 minus the first bit-shift value na; and
right shifting, at the decoder, the vertical MV difference Δvy(i, j) by 14 minus the first bit-shift value na.