Sub-pixel motion compensation interpolation filter in AVS

Abstract

In order to reduce the bit rate of video signals, motion compensation prediction is applied in modern video coding technology. This is a form of temporal redundancy reduction in which the current coding frame is predicted by a motion compensated prediction from some other already decoded frames according to motion vector. As real motion has arbitrary precision, many video coding standards allow motion vectors to have “sub-pixel” resolution. The U4-pel displucement vector resolution is U part of AVS(Audio Video system). In order to estimate and compensate 1/4pel displacements. the image signal on sub-pel position has to be generated by interpolation. This paper introduces CJ new 1/4-pel interpolation method named as Two Steps Four Taps interpolation(TSFT), compared with 1/4-pel interpolation method of H.264, 1 I% spatial complexiQ is reduced, computation complexity is about the same, and a little more average SNR is gained.