Inter picture prediction method for video coding and decoding and codec

Abstract

The invention discloses an inter picture prediction method for video coding and decoding and a codec. The inter picture prediction method for video coding comprises: performing motion estimation over integer pixel positions of a reference picture, to determine an optimal motion vector for a current prediction unit in a current picture; and performing interpolation filtering processing for motion estimation over fractional pixel position by using the integer pixel position information to which the optimal motion vector directs in the reference picture, and spatially neighboring pixel information of the current prediction unit in the current picture. The inter picture prediction method for video decoding comprises performing decoding to obtain a motion vector in a current decoding unit; and for fractional pixel motion vector, performing interpolation filtering processing by using reference pixels to which the optimal motion vector directs in a reference picture, and spatially neighboring pixels of the current prediction unit in the current picture. The invention can improve the video coding and decoding efficiency, reduce the bit rate necessary for provision of the same video quality, and also reduce nonzero prediction residual signal so as to facilitate the reduction of blocking artifacts.