US 12,231,669 B2
Video decoding method and video decoder using quantization groupings
Yin Zhao, Hangzhou (CN); and Haitao Yang, Shenzhen (CN)
Assigned to HUAWEI TECHNOLOGIES CO., LTD., Guangdong (CN)
Filed by HUAWEI TECHNOLOGIES CO., LTD., Guangdong (CN)
Filed on Jun. 28, 2022, as Appl. No. 17/851,378.
Application 17/851,378 is a continuation of application No. 17/191,934, filed on Mar. 4, 2021, granted, now 11,431,997, issued on Aug. 30, 2022.
Application 17/191,934 is a continuation of application No. PCT/CN2019/102944, filed on Aug. 28, 2019.
Claims priority of application No. 201811032693.7 (CN), filed on Sep. 5, 2018; and application No. 201811104788.5 (CN), filed on Sep. 21, 2018.
Prior Publication US 2022/0329839 A1, Oct. 13, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H04N 19/44 (2014.01); H04N 19/105 (2014.01); H04N 19/13 (2014.01); H04N 19/169 (2014.01); H04N 19/176 (2014.01)
CPC H04N 19/44 (2014.11) [H04N 19/105 (2014.11); H04N 19/13 (2014.11); H04N 19/176 (2014.11); H04N 19/1883 (2014.11)] 14 Claims
OG exemplary drawing
 
1. A video decoding method, comprising:
receiving an encoded bitstream of a video;
parsing the bitstream to obtain coding tree split information;
performing, according to the coding tree split information, partition process to obtain a current node;
determining, at least based on a depth of the current node, whether a cover region of the current node is the same as a cover region of a current quantization group (QG);
in response to determining that the cover region of the current node is the same as the cover region of the current QG, obtaining coordinates of an upper-left corner of the cover region of the current QG;
obtaining a quantization parameter (QP) delta of a current coding unit (CU) in the cover region of the current QG; and
obtaining a reconstructed picture of the current CU based on the QP delta of the current CU, wherein the QP delta is represented by an absolute value and a sign, wherein
when the depth of the current node is equal to a second threshold T2 minus 1, and a split mode of the current node is a ternary split mode, the cover region of the current node is the same as the cover region of the current QG; or
when the depth of the current node is equal to a second threshold T2, and a split mode of the current node is a binary split mode or a quadtree split mode, the cover region of the current node is the same as the cover region of the current QG.