FIELD: encoding.
SUBSTANCE: invention relates to video encoding tools. A syntax element indicating whether the residual blocks of the current coding unit (CU) have been processed using colour space conversion is received from the bitstream of encoded video data. The residual blocks of the current CU herein include a residual brightness block, a first residual chromaticity block, and a second residual chromaticity block. In response to the syntax element indicating that the residual blocks of the current CU have been processed using colour space conversion, based on the fact that the conversion skip flag corresponding to each of the residual blocks of the current CU equals 1 and the quantisation parameter (QP) corresponding to each of the residual blocks of the current CU equals 4, the colour space undergoes inverse conversion using the first variant of the colour space conversion equations to the residual blocks of the current CU in order to generate modified versions of the residual blocks of the current CU.
EFFECT: increased efficiency of video encoding.
12 cl, 30 dwg
