Through testing many different Block Matching Algorithms in the motion estimation, the New Three Step Search Algorithm is chosen, which can fulfill the requirement of the system.

在运动估计中通过对多种块匹配算法进行实验，选择了一种可以满足系统要求的算法——新的三步搜索法。

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The three-step search method is a commonly used fast motion estimation algorithm, but its initial step length is too big, thus the estimation effect of slow motion sequence is not so satisfactory.

三步搜索法是一种常用的快速运动估计算法，但由于它的初始步长太大而导致对缓慢运动序列的估计效果不能令人满意。

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Experiments show that the algorithm can obtain almost the same PSNR as full search (FS) at a low computation cost, and it excels three-step search (3ss) algorithm in searching velocity and effect.

实验结果表明，该算法可以较小的搜索代价取得与全搜索相当的效果，在搜索速度与搜索效果方面优于三步法(3ss)。

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