ENCODING METHOD AND APPARATUS, AND DECODING METHOD AND APPARATUS OF IMAGE

摘要

PURPOSE: An image encoding method, a device thereof, an image decoding method thereof, and a device thereof are provided to perform inter prediction by applying an interpolation filter based on a quantization coefficient of a reference picture, thereby reducing the amount of calculation of the interpolation filter by using a lower degree filter tap in comparison to an existing filter tap. CONSTITUTION: An image encoding/decoding device compares a set reference value with a value which adds or deducts a predetermined threshold value to a quantization coefficient of a reference picture(S400). The image encoding/decoding device determines a degree of an interpolation filter tap corresponding to a comparison result(S410). The image encoding/decoding device calculates a sub-pixel value of the reference picture by applying the interpolation filter tap based on the quantization coefficient of the reference picture(S420). [Reference numerals] (S400) Compare a set reference value with a quantization coefficient of a reference picture; (S410) Determine a degree(number) of an interpolation filter tap corresponding to a comparison result; (S420) Perform interpolation