高条纹率InSAR干涉图滤波方法的对比研究

STUDY ON FILTERING METHODS FOR InSAR INTERFEROGRAM OF HIGH FRINGE RATE

探讨复数域均值滤波、圆周期均值滤波、Lee滤波、旋滤波和Goldste in频域滤波方法在高条纹率InSAR干涉图滤波中的效果。对意大利Etna火山真实干涉图的滤波分析表明:在高条纹率情况下,由于受滑动窗口采样的限制,空域滤波都会不同程度地造成干涉条纹的混迭;而Goldste in频域滤波在噪声严重区域并不产生滤波效果,且表现出较好的条纹保持能力,具有很好的保真性和自适应性。

The performances of complex domain mean filter, periodic mean filter, Lee filter, spin filter and Goldstein filter for filtering the InSAR interferogram of high fringe rate are studied. Experiment results from real images of Mountain Etna show that in the high fringe rate case, space domain filter algorithm, even the most effective fringe preserving methods, will still make the fringe blur. However, the Goldstein filter, working in frequency domain, can preserve the fringe effectively while still reducing the level of noise. Moreover, the Goldstein filter demonstrates graceful degradation in regions of pure noise, shows great adaptability.