US 12,439,095 B2
Entropy coding of sign map for transform coefficients
Madhu Peringassery Krishnan, Mountain View, CA (US); Xin Zhao, San Jose, 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 Jan. 11, 2022, as Appl. No. 17/573,059.
Claims priority of provisional application 63/175,869, filed on Apr. 16, 2021.
Prior Publication US 2022/0353547 A1, Nov. 3, 2022
Int. Cl. H04N 19/91 (2014.01); H04N 19/176 (2014.01); H04N 19/18 (2014.01)
CPC H04N 19/91 (2014.11) [H04N 19/176 (2014.11); H04N 19/18 (2014.11)] 17 Claims
OG exemplary drawing
 
1. A method for decoding video data, the method comprising:
receiving a coded video bitstream for a plurality of video blocks including a first video block, wherein the first video block includes a first color component co-located with a second color component;
determining a reference sign value of a reference transform coefficient for the first color component co-located with the second color component; and
performing entropy decoding of a sign value of a first transform coefficient for the second color component, including:
when the first transform coefficient is a direct current (DC) coefficient for the second color component, entropy decoding the sign value based on context information that includes the reference sign value of the reference transform coefficient for the first color component co-located with the second color component.