基于双边滤波算法InSAR干涉图平滑处理的分析

Analysis of Smoothing Processing of InSAR Interferogram based on Bilateral Filtering Algorithm

双边滤波算法是数字图像处理领域中较优良的一种算法,研究该算法应用于InSAR干涉图噪声抑制,提出双边与中值滤波的联合滤波算法,采用真实数据分析滤波效果。文中先阐述了常用的滤波算法和双边滤波算法的原理,然后对含有噪声的合成孔径雷达干涉图像进行不同的滤波算法处理,并对滤波结果进行了统计分析,最后采用双边与中值滤波的联合滤波方法,对原干涉图进行处理。结果表明,先双边滤波,再中值滤波处理结果的残留点最少,且对干涉条纹边缘有较好的保护效果。

Bilateral filtering algorithm is an excellent algorithm in the field of digital image processing, the algorithm is studied applying to InSAR interferogram noise suppression, the combination of bilateral and median filtering algorithm is proposed, and the filtering effect is analyzed by using real data. The principle of bilateral filtering algorithm is illustrated first in the paper, then, a synthetic aperture radar interferogram that had noise with different filtering algorithm is processed, and the filtering results are analyzed statistically, finally, original interferogram is processed by using a combination of bilateral and median filtering method. Experimental results show that the result of the method of bilateral filtering and then median filtering makes the least residues, and has an excellent protection effect on the edge of interference fringe.