SAR images are inevitably influenced by the coherent speckle noise due to the scattering of targets in the process of SAR imaging, so there are so many coherent speckle denoising methods for SAR images. However, the enhanced Lee filtering neglects the directionality of edge as zoning. Therefore, aiming at the problem that the enhanced Lee filtering detection edge has no directionality, Ratio edge detection arithmetic operators is introduced based on the enhanced Lee filtering algorithm, and an improved Lee filtering denoising algorithm is proposed. The simulation experimental results demonstrate that in comparison with the traditional SAR filtering algorithm, the method has a better denoising effect and owns a better edge keeping ability.%在SAR成像过程中,由于散射的存在,SAR图像不可避免地会受到相干斑噪声的影响.为此,已经有了多种去除相干斑的方法.不过,增强型的Lee滤波在划分区域时没有考虑边缘的方向性.因此,针对增强型的Lee滤波检测边缘不具有方向性,在增强的Lee滤波算法的基础上,引入了Ratio边缘检测算子,将二者相结合,提出了一种改选的Lee滤波去噪方法.通过仿真实验,结果表明相对于一些传统的SAR图像滤波算法,此方法不仅具有良好的滤波效果,而且具备更好的边缘保持能力.
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