由于基于块匹配的快速运动搜索算法中三步法的小运动估计效果较差,使其运动估计精度明显下降,还导致三步法缺乏良好的扩展性. 因此对三步法进行了改进,即在前两步总是将搜索步长减半继

续搜索.-As a result of block matching based on the rapid movement in the three-step search algorithm for motion estimation of small less effective so that it significantly decreased the accuracy of motion estimation, but also three-step method resulted in a lack of good scalability. Therefore, an improved three-step method, namely, the former two-step search step size is always half continuing their search.