The detection of moving targets in image sequences is always the focus of the research work these years. To detect the small targets in image sequences, background suppression is a key step. Generally the irregular motion of the video appliance leads to the motion of the background. So it is necessary to get the global motion estimation before detecting process of small target. In this paper, we propose a new method to estimate the global motion parameters, which is called Center-Biased Motion Detection usi...