FIELD: information technologies.
SUBSTANCE: device comprises a facility for separation of the input image into multiple subunits exposed to control by quantisation, a decision-making facility on parameter of quantisation of each of multiple subunits, a facility of setting a previously determined parameter used for calculation of the difference value between the quantisation parameter and the predetermined parameter in the main unit for the quantisation parameter of the first subunit in the main unit, exposed to quantisation, a facility to calculate the difference value between the predetermined parameter and the quantisation parameter of each of multiple subunits in the main unit, a facility to code the difference value.
EFFECT: increased speed of coding and decoding.
22 cl, 23 dwg
