US 11,818,366 B2
Method and apparatus for intra mode coding
Liang Zhao, Sunnyvale, CA (US); Xin Zhao, San Diego, CA (US); Xiang Li, Los Gatos, 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 Dec. 14, 2021, as Appl. No. 17/550,486.
Application 17/550,486 is a continuation of application No. 17/036,342, filed on Sep. 29, 2020, granted, now 11,240,514.
Application 17/036,342 is a continuation of application No. 16/549,524, filed on Aug. 23, 2019, granted, now 10,819,986, issued on Oct. 27, 2020.
Application 16/549,524 is a continuation of application No. 16/198,951, filed on Nov. 23, 2018, granted, now 10,469,845, issued on Nov. 5, 2019.
Claims priority of provisional application 62/734,996, filed on Sep. 21, 2018.
Prior Publication US 2022/0103835 A1, Mar. 31, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H04N 19/167 (2014.01); H04N 19/11 (2014.01)
CPC H04N 19/167 (2014.11) [H04N 19/11 (2014.11)] 20 Claims
OG exemplary drawing
 
1. A method of controlling intra prediction for encoding a video sequence, the method being performed by at least one processor, and the method comprising:
determining a ratio of a width to a height of a coding unit;
based on the determined ratio being different than one, adding, to a table including a plurality of intra prediction modes corresponding to intra prediction angles, first wide angles toward a left portion of bottom edge of the coding unit, second wide angles toward a top portion of right edge of the coding unit, and additional intra prediction modes respectively corresponding to the first wide angles and the second wide angles; and
selecting, for encoding the video sequence, one of the plurality of intra prediction modes or one of the additional intra prediction modes added to the table,
wherein each of the first wide angles added to the table has an angular direction α with tan(α) equal to {35/32, 39/32, 45/32, 51/32, 57/32, 64/32, 73/32, 86/32, 102/32, 128/32, 171/32, 256/32, 341/32, 512/32}.