US 12,425,596 B2
Systems and methods for dependent quantization based on current dequantization states
Madhu Peringassery Krishnan, Palo Alto, CA (US); Lien-Fei Chen, Palo Alto, CA (US); Biao Wang, Palo Alto, CA (US); Xin Zhao, Palo Alto, CA (US); Roman Chernyak, Palo Alto, CA (US); and Shan Liu, Palo Alto, CA (US)
Assigned to TENCENT AMERICA LLC, Palo Alto, CA (US)
Filed by Tencent America LLC, Palo Alto, CA (US)
Filed on Apr. 26, 2024, as Appl. No. 18/648,129.
Claims priority of provisional application 63/463,815, filed on May 3, 2023.
Prior Publication US 2024/0373012 A1, Nov. 7, 2024
Int. Cl. H04N 19/00 (2014.01); H04N 19/124 (2014.01); H04N 19/18 (2014.01); H04N 19/44 (2014.01)
CPC H04N 19/124 (2014.11) [H04N 19/18 (2014.11); H04N 19/44 (2014.11)] 20 Claims
OG exemplary drawing
 
1. A method of video decoding performed at a computing system having memory and one or more processors, the method comprising:
receiving a video bitstream comprising a plurality of blocks and a plurality of quantized transform coefficients;
deriving a dequantized transform coefficient for a first quantized transform coefficient of the plurality of quantized transform coefficients;
obtaining an adjusted transform value by applying an offset value to the dequantized transform coefficient, the adjusted transform value based on a quantized transform coefficient level and a current state of dequantization; and
reconstructing a first block using the adjusted transform value.