CPC H04N 19/105 (2014.11) [H04N 19/132 (2014.11); H04N 19/176 (2014.11); H04N 19/186 (2014.11); H04N 19/1883 (2014.11); H04N 19/30 (2014.11)] | 20 Claims |
1. A method of processing video data, comprising:
determining, during a conversion between a current chroma video block of a video and a bitstream of the video, that a scaling process is applied on chroma residual samples of the current chroma video block; and
performing the conversion by applying the scaling process on the chroma residual samples,
wherein, in the scaling process, the chroma residual samples are scaled based on at least one scaling factor before being used to reconstruct the current chroma video block,
wherein the at least one scaling factor is derived based on an averaged luma variable computed based on at least one neighboring luma block of a video unit of the video which is determined based on a luma sample corresponding to a top-left sample of the current chroma video block, and
wherein, in response to all of the at least one neighboring luma block being unavailable, the averaged luma variable is set to a default fixed value.
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