CPC H04N 19/124 (2014.11) [H04N 19/186 (2014.11); H04N 19/196 (2014.11)] | 20 Claims |
1. A method of obtaining quantization parameters (QPs) for chrominance components based on QPs for luminance components, wherein the method is performed by a decoder or encoder, comprising:
obtaining a luminance QP for a luma component of a coding unit;
obtaining a QP index (QPi) based at least in a part on the luminance QP;
obtaining a chrominance QP (QPc) for a chroma component of the coding unit based on the QP index using a preset lookup table, wherein the maximum difference between the QP index and the QPc is equal to 3.
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