ENCODING DEVICE, DECODING DEVICE, ENCODING METHOD AND DECODING METHOD Russian patent published in 2017 - IPC H04N19/00 H04N19/517 

FIELD: information technology.

SUBSTANCE: invention relates to encoding/decoding images. Encoding device comprises a processing circuit, configured to: determine a first reference value based on fixed point accuracy, which is accuracy of a weight coefficient, which is used to multiply a reference image; encoding a first difference and fixed point accuracy, wherein said first difference is difference between weight coefficient and said first reference value; determine a second reference offset value, which must be added to reference image to a correct pixel value, by subtraction of a value obtained by both multiplying median value of maximum pixel value by weight coefficient, and right shift for a bit or bits of fixed point accuracy, from said median value; and encoding second difference, which is difference between said shift and second reference value.

EFFECT: technical result is high encoding efficiency.

14 cl, 36 dwg