CODING AND DERIVING QUANTIZATION PARAMETERS

摘要

QP control information valid for a block (4) of samples (5) is parsed. A QP to use for the block (4) of samples (5) is derived according to a first QP derivation process independent on the QP control information if residual data of the block (4) of samples (5) is not color transformed and according to a second QP derivation process dependent on the QP control information if the residual data of the block (4) of samples (5) is color transformed. The embodiments thereby decouple QP parameters for blocks (4) of samples (5) that are coded with color transform and those that are coded without color transform. This decoupling achieves better flexibility during encoding and results in better visual quality.