The mean blood velocity was estimated using the proposed method with a relative error of 5.62%, which demonstrated improved accuracy compared to 12.83% by using the high-pass filtering method.

实验中得到了与实际更接近的平均流速估计，相对误差仅为5.62%，与滤波法的相对误差12.83%相比，准确性得到了一定的提高。

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Methods Based on improving of traditional histogram equalization, the proposed method adopts the minimum mean brightness error bi-histogram equalization and an effective intersected point.

方法在改进常规直方图均衡化算法的基础上，以最小灰度平均值误差二元直方图均衡化为基础，引入另一个有效分割点。

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And both the mean and the mean square error of the coordinate series are testified this method.

通过算例分析，无论从坐标序列的均值还是中误差都验证了本方法的有效性。

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