| CPC H04N 19/124 (2014.11) [H04N 19/117 (2014.11); H04N 19/176 (2014.11); H04N 19/186 (2014.11)] | 20 Claims |
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1. A deblocking 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 in image encoding or image decoding, comprising:
performing a decision process for the chroma block edge; and
performing a filtering process for the chroma block edge at least based on a value of a variable (tC) used for the decision process;
wherein the decision process comprises:
determining a first chroma quantization parameter (QpCp) for the first chroma block, wherein the first chroma quantization parameter (QpCp) is determined based on a first luma quantization parameter (QpYP) of a first luma block of the first image block and a chroma quantization parameter (QP) mapping table for the first chroma block;
determining a second chroma quantization parameter (QpCq) for the second chroma block, wherein the second chroma quantization parameter (QpCq) is determined based on a second luma quantization parameter (QpYQ) of a second luma block of the second image block and a chroma QP mapping table for the second chroma block; and
determining a third chroma quantization parameter (QpC) based on the first chroma quantization parameter (QpCp) for the first chroma block and the second chroma quantization parameter (QpCq) for the second chroma block,
wherein a value of a threshold variable (tC′) is determined based on the third chroma quantization parameter (QpC) using a mapping table, and the value of the variable (tC) is derived based on the value of the threshold variable (tC′);
and wherein at least one of the first chroma block and the second chroma block is a Joint Cb-Cr residual (JCCR) coded block.
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