US 12,244,806 B2
Method and apparatus for chrominance quantization parameters signalling
Roman Igorevich Chernyak, Moscow (RU); Sergey Yurievich Ikonin, Moscow (RU); Timofey Mikhailovich Solovyev, Moscow (RU); Alexander Alexandrovich Karabutov, Moscow (RU); and Elena Alexandrovna Alshina, Munich (DE)
Assigned to HUAWEI TECHNOLOGIES CO., LTD., Guangdong (CN)
Filed by HUAWEI TECHNOLOGIES CO., LTD., Guangdong (CN)
Filed on Mar. 22, 2022, as Appl. No. 17/700,904.
Application 17/700,904 is a continuation of application No. PCT/RU2020/050237, filed on Sep. 23, 2020.
Claims priority of application No. PCT/RU2019/000664 (WO), filed on Sep. 23, 2019.
Prior Publication US 2022/0217347 A1, Jul. 7, 2022
Int. Cl. H04N 19/124 (2014.01); H04N 19/176 (2014.01); H04N 19/186 (2014.01); H04N 19/70 (2014.01)
CPC H04N 19/124 (2014.11) [H04N 19/176 (2014.11); H04N 19/186 (2014.11); H04N 19/70 (2014.11)] 18 Claims
OG exemplary drawing
 
1. A method for inverse quantization of a current chrominance block of a picture, wherein the method is performed by a decoder, and the method comprising:
receiving a bitstream;
obtaining a value of a joint chrominance component residual (JCCR) control flag from the bitstream, wherein the JCCR control flag specifies whether joint coding of a cb chrominance component and a cr chrominance component is enabled or disabled;
obtaining a chrominance mapping information from the bitstream directly dependent on the value of the JCCR control flag;
obtaining at least one chrominance quantization parameter (QP) offset from the bitstream directly dependent on the value of the JCCR control flag;
obtaining a QP value for the current chrominance block based on the obtained chrominance mapping information and the at least one obtained chrominance QP offset; and
performing inverse quantization on the current chrominance block by using the obtained QP value.