US 11,743,465 B2
Image decoding method based on chroma quantization parameter data, and apparatus therefor
Seethal Paluri, Seoul (KR); Seunghwan Kim, Seoul (KR); and Jie Zhao, Seoul (KR)
Assigned to LG Electronics Inc., Seoul (KR)
Filed by LG Electronics Inc., Seoul (KR)
Filed on May 24, 2022, as Appl. No. 17/752,396.
Application 17/752,396 is a continuation of application No. 17/546,507, filed on Dec. 9, 2021, granted, now 11,477,454.
Application 17/546,507 is a continuation of application No. PCT/KR2020/007584, filed on Jun. 11, 2020.
Claims priority of provisional application 62/860,237, filed on Jun. 11, 2019.
Prior Publication US 2022/0295063 A1, Sep. 15, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H04N 19/124 (2014.01); H04N 19/132 (2014.01); H04N 19/186 (2014.01); H04N 19/70 (2014.01)
CPC H04N 19/124 (2014.11) [H04N 19/132 (2014.11); H04N 19/186 (2014.11); H04N 19/70 (2014.11)] 13 Claims
OG exemplary drawing
 
1. An image decoding method, performed by a decoding apparatus, comprising:
receiving a flag representing whether quantization parameter data for combined chroma coding is present, based on a chroma type;
receiving the quantization parameter data for the combined chroma coding based on the flag;
receiving quantization parameter offset information for the combined chroma coding;
deriving a chroma quantization parameter table based on the quantization parameter data;
deriving a quantization parameter for the combined chroma coding based on the chroma quantization parameter table and the quantization parameter offset information;
deriving residual samples based on the quantization parameter; and
generating a reconstructed picture based on the residual samples,
wherein the quantization parameter data includes a syntax element for a starting quantization parameter of the chroma quantization parameter table and a syntax element for a number of quantization parameters in the chroma quantization parameter table.