US 11,689,723 B2
Apparatus and method for inverse quantization
Roman Igorevich Chernyak, Moscow (RU); Alexander Alexandrovich Karabutov, Moscow (RU); Sergey Yurievich Ikonin, Moscow (RU); Timofey Mikhailovich Solovyev, Moscow (RU); Haitao Yang, Shenzhen (CN); Jianle Chen, San Diego, CA (US); and Yin Zhao, Hangzhou (CN)
Assigned to HUAWEI TECHNOLOGIES CO., LTD., Guangdong (CN)
Filed by Huawei Technologies Co., Ltd., Guangdong (CN)
Filed on Mar. 19, 2021, as Appl. No. 17/249,946.
Application 17/249,946 is a continuation of application No. PCT/CN2019/107134, filed on Sep. 21, 2019.
Claims priority of provisional application 62/745,983, filed on Oct. 15, 2018.
Claims priority of provisional application 62/744,125, filed on Oct. 10, 2018.
Claims priority of provisional application 62/734,982, filed on Sep. 21, 2018.
Prior Publication US 2021/0218968 A1, Jul. 15, 2021
Int. Cl. H04N 19/124 (2014.01); H04N 19/105 (2014.01); H04N 19/132 (2014.01); H04N 19/176 (2014.01); H04N 19/186 (2014.01); H04N 19/46 (2014.01)
CPC H04N 19/124 (2014.11) [H04N 19/105 (2014.11); H04N 19/132 (2014.11); H04N 19/176 (2014.11); H04N 19/186 (2014.11); H04N 19/46 (2014.11)] 19 Claims
OG exemplary drawing
 
1. A method for inverse quantization of a picture block, the method comprising:
obtaining one or more existing quantization parameter (QP) values from a bitstream, wherein the one or more existing QP values are associated with a chrominance component of the picture block;
determining a QP value for the chrominance component of the picture block based on the one or more existing QP values; and
performing inverse quantization on the chrominance component of the picture block using the determined QP value;
wherein the one or more existing QP values comprises a QP value for a luminance component of the picture block collocated with the chrominance component of the picture block, wherein the QP value for the luminance component is not a delta QP value;
wherein determining the QP value for the chrominance component of the picture block based on the one or more existing QP values comprises:
determining the QP value for the chrominance component of the picture block based on the QP value for the luminance component of the picture block collocated with the chrominance component of the picture block.