In the H.264 video coding system,fast integer motion estimation algorithms have been fully developed,however,the fractional pixel motion estimation has become more comparable to that of the integer case.A content adaptive fractional pixel motion estimation algorithm is proposed in this paper.First,based on the smooth macro-block prediction,an algorithm to skip ineffective fractional pixel search is proposed.Then,to further reduce the computation load of H.264 fractional pixel motion estimation,an extended d...