Patent ID: 9609324
Date: 2017-03-28
CPC Classifications: H04N

Claim:
1. An image encoding method, the method comprising: encoding a filter flag which indicates whether default interpolation filter coefficients are used as interpolation filter coefficients for a current image unit to predict one or more blocks in the current image unit, wherein the default interpolation filter coefficients are either (i) interpolation filter coefficients used in an image unit preceding the current image unit or (ii) interpolation filter coefficients set in a larger image unit to which the current image unit belongs to; when the default interpolation filter coefficients are not used for the current image unit, determining interpolation filter coefficients for the current image unit and encoding an information on the interpolation filter coefficients for the current image unit into a bit stream wherein, when the default interpolation filter coefficients are used as the interpolation filter coefficients for the current image unit, the information on the interpolation filter coefficients for the current image unit is not encoded into the bit stream; interpolating pixels in a reference frame for predicting a current block in the current image unit by using the interpolation filter coefficients for the current image unit; generating a prediction block of the current block from the interpolated pixels in the reference frame; and encoding the current block into the bit stream by using the prediction block.