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 use an extrapolation method to a reference block, thereby reducing a data size of a reference block which is inputted and outputted to a real memory for inter prediction performance. CONSTITUTION: An encoding/decoding device obtains a reference block from a reference picture based on motion information for a current block(S400). The encoding/decoding device performs extrapolation based on one or more reference pixels in the reference block and generates an extrapolation reference pixel in an exterior area of the reference block(S410). The encoding/decoding device calculates a sub-pixel value of a unit which is less than a constant by applying an interpolation filter based on pixels within the final reference block(S420). [Reference numerals] (S400) Obtain a reference block; (S410) Obtain a final reference block by performing extrapolation based on the reference block; (S420) Perform interpolation using the final reference block