Huawei Technologies Co., Limited

Roman Igorevich Chernyak

Jianle Chen

Haitao Yang

Semih Esenlik

Anand Meher Kotra

Yin Zhao

Elena Alexandrovna Alshina

Sergey Yurievich Ikonin

Han Gao

Biao Wang

Timofey Mikhailovich Solovyev

Alexander Alexandrovich Karabutov

A method for inverse quantization of a current block of a picture is provided. The method is performed by a decoder, and the picture comprises a luminance component and a chrominance component, where the luminance component and the chrominance component are partitioned into multiple blocks. The method includes obtaining one or more existing quantization parameter (QP) values from a received bitstream, wherein the one or more existing QP values are associated with a current block in the chrominance component; determining a QP value for the current block in the chrominance component based on the one or more existing QP values; performing inverse quantization on the current block in the chrominance component using the determined QP value.

Apparatus and method for inverse quantization

A method for deblocking a chroma block edge between a first chroma block of a first image block and a second chroma block of a second image block. The method includes a decision process which includes: determining a first chroma quantization parameter for the first chroma block based on a first luma quantization parameter of a first luma block of the first image block and a chroma QP mapping table for the first chroma block; determining a second chroma quantization parameter for the second chroma block based on a second luma quantization parameter of a second luma block of the second image block and a chroma QP mapping table for the second chroma block; determining an averaged and rounded chroma quantization parameter based on the first chroma quantization parameter and the second chroma quantization parameter; and determining a threshold parameter based on the averaged and rounded chroma quantization parameter.

Performing chroma deblocking for blocks which use joint chroma coding

Growing community of inventors

Munich, Germany

Roman Igorevich Chernyak