In selective masking smoothing algorithm, it is needed to calculate grayscale average and variance of a large number of image Windows.
在选择掩模平滑算法中，需要计算一幅图像的大量局部窗口的灰度均值和方差。
In view of the above, this paper USES selective masking smoothing to remove noise and linear gray transform method to solve the problem of gray uneven.
鉴于以上情况，本文选用了选择式掩模滤波对噪声进行去除，用线性灰度变换方法解决了灰度不均匀的问题。
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