噪声抑制的两个关键环节为建立真实后向散射系数的估计机制和制定同质区域像素样本的选择方案。Lee滤波是利用图像局部统计特性进行图像斑点滤波的典型方法之一，其是基于完全发育的斑点噪声模型，选择一定长度的窗口作为局部区域，假定先验均值和方差可以通过计算局域的均值和方差得到。-Two key aspects of the estimated noise suppression mechanisms for the establishment of the backscattering coefficient and the development of a true homogeneous area of ​ ​ the pixel sample options. Lee filter is a typical method using the local statistical characteristics of the image speckle filtering, which is based on fully developed speckle noise model to select a length of the window as a local area can be assumed a priori by calculating the mean and variance of the mean local and variance obtained.