Based on edge directional information of the polarimetric SAR image, an improved speckle reducing method for Lee filtering has been proposed. Other than the fixed filter window size in Lee filtering, this algorithm automatically adjusts the filter window size by comparing the edge directions of the neighborhoods. Experiments demonstrate the effectiveness both on speckle reduction and preservation of details. Comparisons of this method and Lee filtering are also made.%针对极化Lee滤波因受到滤波窗尺寸影响,存在抑制相干斑与保留细节信息这一矛盾,提出了一种基于边缘特性的自适应窗改进滤波方法.通过比较不同尺寸邻域窗内边缘方向的变化情况,自适应地选择滤波窗尺寸.实验结果表明,该方法在有效抑制相干斑的同时,也能较好地保留图像细节信息,能有效克服Lee滤波的固定尺寸滤波窗这一限制.
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