US 12,149,692 B2
Method and apparatus for chrominance QP offsets tables signaling and derivation
Roman Igorevich Chernyak, Moscow (RU); Sergey Yurievich Ikonin, Moscow (RU); Timofey Mikhailovich Solovyev, Moscow (RU); Alexander Alexandrovich Karabutov, Moscow (RU); Elena Alexandrovna Alshina, Munich (DE); and Anand Meher Kotra, Munich (DE)
Assigned to HUAWEI TECHNOLOGIES CO., LTD., Shenzhen (CN)
Filed by Huawei Technologies Co., Ltd., Shenzhen (CN)
Filed on Mar. 22, 2022, as Appl. No. 17/700,898.
Application 17/700,898 is a continuation of application No. PCT/RU2020/050239, filed on Sep. 23, 2020.
Claims priority of application No. PCT/RU2019/000666 (WO), filed on Sep. 23, 2019.
Prior Publication US 2022/0217346 A1, Jul. 7, 2022
Int. Cl. H04N 19/124 (2014.01); H04N 19/157 (2014.01); H04N 19/176 (2014.01); H04N 19/186 (2014.01); H04N 19/70 (2014.01)
CPC H04N 19/124 (2014.11) [H04N 19/157 (2014.11); H04N 19/176 (2014.11); H04N 19/186 (2014.11); H04N 19/70 (2014.11)] 20 Claims
OG exemplary drawing
 
1. A method for inverse quantization, comprising:
obtaining, by a decoder, from a bitstream, a joint chrominance residual (JCCR) mode for a current block of a picture or a frame, wherein the JCCR mode is a JCCR mode of a plurality of available JCCR modes, and is indicated by one or more flags in the bitstream, and wherein each JCCR mode of the plurality of available JCCR modes is associated with a different mixing factor that relates a coded chrominance component to a derived chrominance component;
obtaining one or more quantization parameter (QP) offset values for chrominance components from the bitstream;
determining at least one QP value for the current block depending on the JCCR mode; and
performing an inverse quantization process on a chrominance component of the current block using the determined QP value.