Yang Song Yao Ma Zhenyu Liu Takeshi Ikenaga Satoshi Goto Hardware-oriented direction-based fast fractional motion estimation algorithm in H.264/AVC. 1009-1012 2008 ICME http://dx.doi.org/10.1109/ICME.2008.4607608 conf/icmcs/2008 db/conf/icmcs/icme2008.html#SongMLIG08