Next initial step length is modified to avoid too great estimation of modification when direction is not ideal.
对初始步长进行了修正，以避免方向不理想时时修正量的过大估计。
Meanwhile, a new method of calculating initial step length was proposed.
同时，提出了新的一维搜索初始步长的约束方法。
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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