By studying the spatio-temporal correlation and the center-biased characeristic of motion vectors in image sequences

this paper classifies the macro-blocks as different types and takes advantage of the relative blocks instead of neighbour blocks to predict the initial point.A new adaptive motion estimation algorithm based on selecting predictive initial search point is presented

according to which different modes are agilely selected in accordance with image contents.It has been proved with the experiments that this algorithm greatly improves the searching speed and at the same time guarantees image performances with consideration to complexity and accuracy of motion estimation.