Image interpolation method and apparatus

An image interpolation method comprising:

• selecting an interpolation filter from among different interpolation filters according to locations of sub pixels between integer pixels;
• and
• generating sub pixel values at the locations of the sub pixels using the selected interpolation filters,
• wherein, the selecting the interpolation filter comprises:
• when a sub pixel is located on ½ sub pixel, selecting a 8-tap interpolation filter having a coefficient {−1,4,−,40,40,−11,4,−1},
• wherein the image is split into a plurality of maximum coding units according to information about the maximum size of the coding unit,
• the maximum coding unit is hierarchically split into one or more coding units of depths including at least one of a current depth and a lower depth according to split information,
• when the split information indicates a split for the current depth, the coding unit of a current depth is split into four coding units of a lower depth, independently from neighboring coding units, and
• when the split information indicates a non-split for the current depth, one or more prediction units are obtained from the coding unit of the current depth.