FIELD: electrical communication engineering.
SUBSTANCE: invention relates to means of signaling additional chroma quantization parameter (QP) offset values. Chroma quantization method comprises: identifying one or more initial sets of chroma QP offset values at two or more levels of a video coding hierarchy, each initial set of chroma QP offset values for specifying chroma QPs of video units encompassed by one level of a video coding hierarchy; and computing a set of chroma QP values for the plurality of video units through (i) addition of initial sets of chroma QP offset values that were identified for a plurality of video units, and (ii) an additional set of chroma QP offset values that was identified for the quantization group.
EFFECT: technical result consists in expanding the range of technical means for chroma quantization.
20 cl, 22 dwg
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