Patent ID: 11968388
Assignee: BEIJING DAJIA INTERNET INFORMATION TECHNOLOGY CO., LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A bit-width representation method of prediction refinement with optical flow (PROF) for decoding a video signal, comprising:
obtaining a reference picture I associated with a video block within the video signal;
obtaining prediction samples I(i,j) of the video block from a reference block in the reference picture I, wherein i and j represent a coordinate of one sample with the video block;
controlling internal bit-widths of a PROF derivation process for various representation precisions of internal PROF parameters by applying right-shifting to the internal PROF parameters based on different bit-shift values, wherein the internal PROF parameters comprise horizontal gradient values, vertical gradient values, horizontal motion difference values, and vertical motion difference values derived for the prediction samples I(i,j);
obtaining prediction refinement values for samples in the video block based on the PROF derivation process being applied to the video block based on the prediction samples I(i,j); and
obtaining prediction samples of the video block based on the combination of the prediction samples and the prediction refinement values.