US 12,267,513 B2
Methods and apparatus of residual and coefficient coding
Yi-Wen Chen, Beijing (CN); Xiaoyu Xiu, Beijing (CN); Tsung-Chuan Ma, Beijing (CN); Hong-Jheng Jhu, Beijing (CN); Xianglin Wang, Beijing (CN); and Bing Yu, Beijing (CN)
Assigned to BEIJING DAJIA INTERNET INFORMATION TECHNOLOGY CO., LTD., Beijing (CN)
Filed by BEIJING DAJIA INTERNET INFORMATION TECHNOLOGY CO., LTD., Beijing (CN)
Filed on Jan. 24, 2022, as Appl. No. 17/583,092.
Application 17/583,092 is a continuation of application No. PCT/US2020/052527, filed on Sep. 24, 2020.
Claims priority of provisional application 62/905,342, filed on Sep. 24, 2019.
Prior Publication US 2022/0150522 A1, May 12, 2022
Int. Cl. H04N 19/44 (2014.01); H04N 19/176 (2014.01); H04N 19/70 (2014.01); H04N 19/91 (2014.01)
CPC H04N 19/44 (2014.11) [H04N 19/176 (2014.11); H04N 19/70 (2014.11); H04N 19/91 (2014.11)] 20 Claims
OG exemplary drawing
 
1. A method of decoding video data, comprising:
receiving, from bitstream, video data corresponding to a transform-skip mode coded block;
determining, from the video data, a first codeword, a second codeword and a first group of codewords for a pixel within the transform-skip mode coded block;
deriving an initial level value from the first group of codewords;
converting the first codeword into a remainder of the pixel in accordance with a predefined mapping relationship that is generated using a constant Rice parameter for the transform-skip mode coded block, wherein the constant Rice parameter is fixed to a value of 1 according to the transform-skip mode coded block;
determining a sign for the remainder according to the second codeword;
deriving a quantized residual of the pixel from the remainder, the sign and the initial level value; and
obtaining a reconstructed sample of the pixel based on the quantized residual.