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

Claim 8:
9. A bit-depth representation method of prediction refinement with optical flow (PROF) for decoding a video signal, comprising:
obtaining, at the decoder, a first reference picture I associated with a video block within the video signal;
obtaining, at the decoder, prediction samples I(i, j) of the video block from a reference block in the first reference picture I, wherein i and j represent a coordinate of one sample within the video block;
controlling, at the decoder, internal bit-depths of a PROF derivation process for various representation precisions of internal PROF parameters by applying right-shifting to the internal PROF parameters based on a first bit-shift value na, 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, at the decoder, 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, at the decoder, final prediction samples of the video block based on the combination of the prediction samples I(i, j) and the prediction refinement values.