一种局部自适应的干涉相位图滤波方法
A Locally Adaptive Filter for Noise Filtering of InSAR Interferogram
-
摘要: 提出了一种基于局部频率估计的自适应干涉相位图滤波方法。首先,利用相似最大似然法对干涉相位图进行局部频率估计,根据局部频率估计值,求取滤波窗口大小和旋转角度,通过内插求取滤波窗口内的像素值,使窗口内的像素更协调一致;然后,利用Lee滤波算法对窗口内的像素进行处理。仿真与实测数据处理结果表明,该方法不仅能有效抑制干涉相位噪声,而且能很好地保持干涉条纹的细节信息。Abstract: An adaptive filtering approach for interferograms is proposed,which is a modification to the Lee adaptive complex filter.Firstly,the approximate maximum-likelihood(AML) method is introduced.Based on local frequency estimation,the sizes and rotation angle of the filtering window are calculated.The pixels in the filtering window are obtained by an interpolation to make the pixels in the filtering window have more approximately homogeneous values.Secondly,the results are obtained by Lee filtering method.Experimental results show that the proposed method can filter the phase noise effectively,and preserve the details of interferometric fringes better.
下载:
