FIELD: computer equipment.
SUBSTANCE: method of decoding a video image comprises: receiving in a bit stream of a coded video image, a plurality of chroma quantization parameter (QP) values and a plurality of quantisation groups, wherein each quantisation group comprises a set of coding elements; and decoding the encoded video by calculating a plurality of chroma QP for the video image and using the calculated QP chromaticity for decoding the video image, wherein said calculation includes calculating a colour value QP for coding elements of each of the plurality of quantisation groups by: using an index associated with the quantisation group, to select chroma shift QP value from a plurality of chroma shift QP values and to calculate a chroma value QP for a set of quantization group encoding elements based on a selected chroma shift QP value and a QP brightness value associated with the encoding element.
EFFECT: wider range of technical means for quantisation of chromaticity.
20 cl, 22 dwg
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