Adaptive pre-interpolation filter for motion-compensated prediction

The proposed interpolation filter comprises two concatenating fiiters, adaptive pre-interpolation filter (APIF) and the normative interpolation filter in H.264/AVC. The former is applied only to the integer pixels in the reference frames; the latter generates all the sub-position samples, supported by the output of APIF. The convolution of APIF and the standard filter minimizes the motion prediction error on a frame basis. APIF preserves the merits of the adaptive interpolation filter (AIF) and the adaptive loop filter (ALF) in the key technical area (KTA) software and overcomes their drawbacks. The experimental results show that APIF has comparable or even better performance compared with the joint use of AIF and ALF.