QUANTISATION OF CHROMATICITY IN CODING VIDEO SIGNALS Russian patent published in 2020 - IPC H04N19/124 H04N19/186 

FIELD: image and video processing.

SUBSTANCE: invention relates to video signals coding/decoding. Disclosed is a method of signaling additional color shift QP values, which are specific for quantisation groups, wherein each quantisation group sets own set of chroma shift QP values, wherein multiple sets of QP parameter shift values associated with the encoded video image are received, where the encoded video image includes a plurality of quantisation groups, and each quantisation group comprises at least one encoding unit; selecting one set of chroma shift values QP from a plurality of sets of chroma shift values QP for a particular quantisation group from a plurality of quantisation groups; and calculating a chroma quantization parameter set for an encoding element in a specific quantisation group based on a selected set of chroma shift values QP and a brightness value QP associated with the encoding unit.

EFFECT: technical result is wider range of technical means for quantisation of chromaticity for signaling additional values of shifting quantization parameter (QP) chromaticity.

30 cl, 22 dwg