US 12,003,737 B2
Coding of transform coefficients in video coding
Yi-Wen Chen, San Diego, CA (US); Xiaoyu Xiu, San Diego, CA (US); Tsung-Chuan Ma, San Diego, CA (US); and Xianglin Wang, San Diego, CA (US)
Assigned to BEIJING DAJIA INTERNET INFORMATION TECHNOLOGY CO., LTD., Beijing (CN)
Filed by BEIJING DAJIA INTERNET INFORMATION TECHNOLOGY CO., LTD., Beijing (CN)
Filed on Sep. 7, 2021, as Appl. No. 17/468,434.
Application 17/468,434 is a continuation of application No. PCT/US2020/021922, filed on Mar. 10, 2020.
Claims priority of provisional application 62/816,898, filed on Mar. 11, 2019.
Prior Publication US 2021/0409731 A1, Dec. 30, 2021
Int. Cl. H04N 19/18 (2014.01); H04N 19/119 (2014.01); H04N 19/13 (2014.01); H04N 19/159 (2014.01); H04N 19/176 (2014.01); H04N 19/593 (2014.01); H04N 19/70 (2014.01)
CPC H04N 19/18 (2014.11) [H04N 19/119 (2014.11); H04N 19/13 (2014.11); H04N 19/159 (2014.11); H04N 19/176 (2014.11); H04N 19/593 (2014.11); H04N 19/70 (2014.11)] 20 Claims
OG exemplary drawing
 
1. A method for video coding, comprising:
determining, for a current luma transform block in a coding unit, whether a first variable indicating an intra subpartition (ISP) split type is equal to ISP_NO_SPLIT;
in response to determining that the first variable is equal to ISP_NO_SPLIT, determining a luma block flag context index for a luma block flag of the current luma transform block as being equal to zero or one without determining whether the current luma transform block is smaller than the coding unit, wherein the luma block flag of the current luma transform block specifies whether the current luma transform block contains one or more transform coefficient levels not equal to zero; and
in response to determining that the first variable is not equal to ISP_NO_SPLIT, determining the luma block flag context index based on a second variable of a previous luma transform unit in the coding unit.