METHOD AND APPARATUS FOR AFFINE EXTERNAL PREDICTION OF CHROMA SUBUNITS Russian patent published in 2024 - IPC H04N19/513 H04N19/159 H04N19/30 H04N19/186 H04N19/176 

FIELD: physics.

SUBSTANCE: invention relates to image encoding means. Chromaticity scaling factors are determined in the horizontal and vertical directions based on the chromaticity format information. Chromaticity format information indicates the chromaticity format of the current picture to which the block of the current picture belongs. Set (S) of luma subunits of the luma block is determined based on the chroma scaling coefficients. Chroma motion vector is determined for a chroma subunit of a chroma block based on motion vectors of one or more luma subunits in a set (S) of luma subunits. When SubW WidthC and SubHeightC are equal to 1, set of subunits (S) of brightness contains subunit of brightness, indexed as S₀ = (xSbIdx, ySbIdx). When at least one of SubWIDTHC and SubHeightC is not equal to 1, the set of luma subunits (S) comprises: a first luma subunit, indexed as S₀ = ((xSbIdx >> (SubWidthC – 1) << (SubWidthC – 1)), (ySbIdx >> (SubHeightC − 1) << (SubHeightC − 1))), and a second brightness subunit, indexed as S₁ = ((xSbIdx >> (SubWidthC − 1) << (SubWidthC − 1)) + (SubWidthC − 1), (ySbIdx >> (SubHeightC − 1) << (SubHeightC − 1)) + (SubHeightC − 1)).

EFFECT: high efficiency of encoding images.

33 cl, 33 dwg