An image decoding method performed by a decoding apparatus according to the present invention comprises the steps of: obtaining inter prediction information of a current block through a bit stream; deriving motion information of the current block on the basis of the inter prediction information; deriving an interpolation filter of the current block from a plurality of interpolation filters; and performing inter prediction of the current block on the basis of the interpolation filter and the motion information, wherein the plurality of interpolation filters comprise a 4-tap filter, an 8-tap filter, and a 12-tap filter.
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