US 12,407,845 B2
Refined intra prediction angles
Liang Zhao, Sunnyvale, CA (US); Xin Zhao, Santa Clara, CA (US); Jing Ye, San Jose, CA (US); Han Gao, San Diego, CA (US); and Shan Liu, San Jose, CA (US)
Assigned to TENCENT AMERICA LLC, Palo Alto, CA (US)
Filed by Tencent America LLC, Palo Alto, CA (US)
Filed on Jun. 28, 2023, as Appl. No. 18/215,284.
Claims priority of provisional application 63/445,190, filed on Feb. 13, 2023.
Prior Publication US 2024/0275998 A1, Aug. 15, 2024
Int. Cl. H04N 19/44 (2014.01); H04N 19/176 (2014.01); H04N 19/593 (2014.01)
CPC H04N 19/44 (2014.11) [H04N 19/176 (2014.11); H04N 19/593 (2014.11)] 14 Claims
OG exemplary drawing
 
1. A method of video decoding, comprising:
receiving, from a coded video bitstream, coded information of a current coding block in a current picture, the coded information being indicative of a directional intra prediction of the current coding block;
determining an index to an entry in an angle-to-offset mapping lookup table according to the coded information of current coding block, the angle-to-offset mapping lookup table storing a set of derivative values that are associated with angles, wherein the set of derivative values in the angle-to-offset mapping lookup table comprise all integers that are powers of two from 2 to 2048;
accessing the entry in the angle-to-offset mapping lookup table according to the index to obtain a derivative value for the directional intra prediction of the current coding block;
determining, for a pixel in the current coding block, an offset indicative of a reference location in the current picture according to the derivative value and a location of the pixel; and
reconstructing the pixel in the current coding block based on the reference location in the current picture.