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Speckle Noise Suppression in SAR Images Using a Three-Step Algorithm

机译:使用三步算法抑制SAR图像中的斑点噪声

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摘要

Speckle noise can reduce the image quality of synthetic aperture radar (SAR) and complicate image interpretation. This study proposes a novel three-step approach based on the conventional probabilistic patch-based (PPB) algorithm to minimize the impact of bright structures on speckle suppression. The first step improves the calculation accuracy of the weight by pre-processing speckle noise with a linear minimum mean-square error filter and reassessing similarity between pixels. In the second step, an iterative method is developed to avoid interfering with bright structures and acquires a more accurate homogeneous factor by adaptively changing the size of the search window. In the final step, the spreading and blurring of bright structures is corrected using a modified bias-reduction technique. Experimental results demonstrate the proposed algorithm has improved performance for both speckle suppression and preservation of edges and textures, evaluated by indicators including the equivalent number of looks, the edge preservation index, the mean, and standard deviation of ratio images.
机译:斑点噪声会降低合成孔径雷达(SAR)的图像质量,并使图像解释复杂化。这项研究提出了一种新的三步方法,该方法基于常规的基于概率补丁的(PPB)算法,以最小化亮结构对斑点抑制的影响。第一步是通过使用线性最小均方误差滤波器对斑点噪声进行预处理并重新评估像素之间的相似性,来提高权重的计算精度。在第二步中,开发了一种迭代方法来避免干扰明亮的结构,并通过自适应地更改搜索窗口的大小来获取更准确的均一因子。在最后一步中,使用改进的减少偏斜技术校正了明亮结构的散布和模糊。实验结果表明,所提出的算法通过等效外观,边缘保留指数,均值和比率图像的标准偏差等指标对斑点抑制以及边缘和纹理的保留均具有改进的性能。

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